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Oleg A., PHP Backend Engineer

Gdansk, Poland
Last Updated: 2 Apr 2024
Language Verified
Programming Skills Verified
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- 11+ years of experience in web development and 4 years of experience in the Fintech domain. - Proficient in various PHP frameworks such as YII2, Laravel and Symfony. - Experienced in front-end technologies including HTML5, CSS3, SASS, LESS, and JavaScript. - Strong knowledge of APIs and integrating payment gateways (Crypto, APM, S2S). - Expertise in designing and developing secure web applications. - Familiarity with AWS, Microsoft Azure, and other cloud infrastructure management. - Proven track record of successfully delivering projects on time and within budget, receiving commendations for technical prowess, innovative solutions, and team collaboration. - Location: Poland - Available: ASAP

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Amazon Web Services (AWS)

Amazon Web Services (AWS)

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Nikolay Nenkov, Experienced Full Stack Software Developer

Last Updated: 14 Jan 2024

An adept Full Stack Software Developer with over 14 years of comprehensive experience in IT, specializing in Java and Continuous Integration/Continuous Delivery (CI/CD) practices. Technically proficient in developing RESTful APIs, tailoring frontend libraries with Angular and TypeScript, and securing applications with Spring Security. Proven history of leveraging agile methodologies to advance software development life cycle (SDLC) processes in international projects, focusing on industries like gaming and traffic control. Passionate about knowledge sharing, evidenced by contribution to a Java newsletter and mentoring roles. This engineer's history showcases a solid foundation in electrical engineering technologies and a consistent drive for enhancing software manufacturing through innovation and rigorous quality assurance.

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VINOD KAMBIRE, Salesforce Developer/Consultant

Last Updated: 28 Nov 2023

An adept Salesforce Developer/Consultant with over 7 years of experience, specialized in Apex, Visualforce, Integration, Aura, and LWC, along with comprehensive expertise in configuring Salesforce.com. Renowned for architectural skills, the engineer efficiently juggles multiple projects and has a proven track record working with Sales, Service, and Finance Service Clouds, with a foundational understanding of Marketing Cloud. Acclaimed for excellent problem-solving abilities, this candidate has garnered recognition through a 'Dreamforce-2018' appearance and was awarded 'Employee of the Year' in 2018. Poised to excel in challenging environments, having gained international exposure during an on-site tenure in Portugal, the engineer's portfolio is complemented by robust technical skills, including Integration with third-party systems (OpenCTI, Twilio, Airtable), proficiency in Process automation, and development of dynamic Lightning components, underpinned by a Bachelor’s degree in Computer Engineering.

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Async Apex

Async Apex

Microsoft Visual Basic

Microsoft Visual Basic





Salesforce Lightning Component

Salesforce Lightning Component


Kostyantyn, Front-End Software Engineer with Vue.js

Kyiv, Ukraine
Last Updated: 4 Jul 2023

- 7 years of commercial experience with JavaScript, ECMAScript 6. - 5 years with Vue.js framework (including Vue 3 core principles, Style Guide, Composition API, official documentation of the framework) - Deep understanding of HTML5 and CSS3. - Interacting with API endpoints and other web services. - Converting UI/UX mockups into functional web applications with pixel perfection - Experience with responsive layout, web sites, mini applications in JS and SPA in Vue.js. - Familiar with SOLID, DRY and other clean code design principles. - Experience with UI components like UI Kit & Bootstrap - Unit tests (Cypress) - Projects with Wordpress - Intermediary English - Location: Kyiv, Ukraine - Available: ASAP

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JavaScript   7 yr.


Vue.js   5 yr.


WordPress   7 yr.

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Vlad D., Senior Ruby on Rails Engineer

New York, United States
Last Updated: 4 Jul 2023

- 6 years of professional expertise in the IT industry; - Good experience in web development using Ruby on Rails framework and Rails ecosystem; - Good experience in Web development using (REST, SOAP, HTML, CSS, and SCSS); - Beginner experience in Web Development using Java Script (6 months), ReactJS (6 months); - Experience in databases: PostgreSQL, GraphQL. - Encouraged to build features that span everything from database schema design to backend logic, from integrating with 3rd party APIs to designing and building custom APIs. - Love to collaborate with, learn from, and mentor other developers, big fan of SOLID and DRY. - Upper-Intermediate English - Available ASAP

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Ruby on Rails (RoR)

Ruby on Rails (RoR)

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Yaroslav Kuntsevych
Upstaff.com was launched in 2019, addressing software service companies, startups and ISVs, increasingly varying and evolving needs for qualified software engineers

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Henry Akwerigbe
Henry Akwerigbe
This is a super team to work with. Through Upstaff, I have had multiple projects to work on. Work culture has been awesome, teammates have been super nice and collaborative, with a very professional management. There's always a project for you if you're into tech such Front-end, Back-end, Mobile Development, Fullstack, Data Analytics, QA, Machine Learning / AI, Web3, Gaming and lots more. It gets even better because many projects even allow full remote from anywhere! Nice job to the Upstaff Team 🙌🏽.
Vitalii Stalynskyi
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I have been working with Upstaff for over a year on a project related to landscape design and management of contractors in land design projects. During the project, we have done a lot of work on migrating the project to a multitenant architecture and are currently working on new features from the backlog. When we started this project, the hiring processes were organized well. Everything went smoothly, and we were able to start working quickly. Payments always come on time, and there is always support from managers. All issues are resolved quickly. Overall, I am very happy with my experience working with Upstaff, and I recommend them to anyone looking for a new project. They are a reliable company that provides great projects and conditions. I highly recommend them to anyone looking for a partner for their next project.
Владислав «Sheepbar» Баранов
Владислав «Sheepbar» Баранов
We've been with Upstaff for over 2 years, finding great long-term PHP and Android projects for our available developers. The support is constant, and payments are always on time. Upstaff's efficient processes have made our experience satisfying and their reliable assistance has been invaluable.
Roman Masniuk
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I worked with Upstaff engineers for over 2 years, and my experience with them was great. We deployed several individual contributors to clients' implementations and put up two teams of upstaff engineers. Managers' understanding of tech and engineering is head and shoulders above other agencies. They have a solid selection of engineers, each time presented strong candidates. They were able to address our needs and resolve things very fast. Managers and devs were responsive and proactive. Great experience!
Yanina Antipova
Yanina Antipova
Хочу виразити велику подяку за таку швидку роботу по підбору двох розробників. Та ще й у такий короткий термін-2 дні. Це мене здивувало, адже ми шукали вже цілий місяць. І знайдені кандидати нам не підходили Це щось неймовірне. Доречі, ці кандидати працюють у нас і зараз. Та надать приклад іншим працівникам. Гарного дня!)
Наталья Кравцова
Наталья Кравцова
I discovered an exciting and well-paying project on Upstaff, and I couldn't be happier with my experience. Upstaff's platform is a gem for freelancers like me. It not only connects you with intriguing projects but also ensures fair compensation and a seamless work environment. If you're a programmer seeking quality opportunities, I highly recommend Upstaff.
Leaving a review to express how delighted I am to have found such a great side gig here. The project is intriguing, and I'm really enjoying the team dynamics. I'm also quite satisfied with the compensation aspect. It's crucial to feel valued for the work you put in. Overall, I'm grateful for the opportunity to contribute to this project and share my expertise. I'm thrilled to give a shoutout and recommendation to anyone seeking an engaging and rewarding work opportunity.

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FAQs about API Development

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If you urgently need a verified and qualified API developer, and resources for finding the right candidate are lacking, UPSTAFF is exactly the service you need. We approach the selection of API developers professionally, tailored precisely to your needs. From placing the call to the completion of your task by a qualified developer, only a few days will pass.

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Undoubtedly, there are dozens, if not hundreds, of specialized services and platforms on the network for finding the right API engineer. However, only UPSTAFF offers you the service of selecting real qualified professionals almost in real time. With Upstaff, software development is easier than calling a taxi.

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AI tools and expert human reviewers in the vetting process are combined with a track record and historically collected feedback from clients and teammates. On average, we save over 50 hours for client teams in interviewing API candidates for each job position. We are fueled by a passion for technical expertise, drawn from our deep understanding of the industry.

How quickly can I hire API developers through Upstaff? Arrow

Our journey starts with a 30-minute discovery call to explore your project challenges, technical needs, and team diversity. Meet Carefully Matched API Talents. Within 1-3 days, we’ll share profiles and connect you with the right talents for your project. Schedule a call to meet engineers in person. Validate Your Choice. Bring a new API developer on board with a trial period to confirm that you’ve hired the right one. There are no termination fees or hidden costs.

How does Upstaff vet remote API engineers? Arrow

Upstaff Managers conduct an introductory round with potential candidates to assess their soft skills. Additionally, the talent’s hard skills are evaluated through testing or verification by a qualified developer during a technical interview. The Upstaff Staffing Platform stores data on past and present API candidates. Upstaff managers also assess talent and facilitate rapid work and scalability, offering clients valuable insights into their talent pipeline. Additionally, we have a matching system within the platform that operates in real-time, facilitating efficient pairing of candidates with suitable positions.

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Table of Contents

TOP 12 Facts about API

  • API stands for Application Programming Interface. It is a set of rules and protocols that allows different software applications to communicate and interact with each other.
  • APIs enable developers to access and use the functionality of other software applications or services, such as retrieving data, performing actions, or integrating different systems.
  • APIs are commonly used to create integrations between different applications, platforms, or services, allowing them to work together seamlessly.
  • There are various types of APIs, including web APIs (which use HTTP protocols and are commonly used for web development), operating system APIs (which provide access to the underlying operating system functions), and library or framework APIs (which offer pre-built functions and tools for developers).
  • APIs can be public or private. Public APIs are accessible to developers outside the organization that provides the API, while private APIs are restricted to internal use within an organization.
  • APIs play a crucial role in modern software development and have become essential for building scalable and interconnected systems.
  • APIs provide developers with the ability to leverage existing functionality and services, saving time and effort by not reinventing the wheel.
  • APIs can be used to extend the capabilities of a software application by integrating with third-party services, such as payment gateways, social media platforms, or mapping services.
  • APIs have become a fundamental part of many industries, including e-commerce, finance, social media, healthcare, and transportation, among others.
  • APIs can be versioned to ensure backward compatibility and allow developers to make changes to the API without breaking existing integrations.
  • API documentation is crucial for developers to understand how to use an API effectively. Well-documented APIs provide clear instructions, examples, and reference materials.
  • APIs can be monetized by offering them as a service or charging fees for their usage, allowing organizations to generate revenue from their software assets.

Pros & cons of API

8 Pros of API

  • Increased Efficiency: APIs allow different software systems to communicate and share data, leading to improved efficiency and productivity.
  • Integration: APIs enable the integration of various software applications and services, allowing businesses to create new functionalities and enhance their existing systems.
  • Scalability: APIs provide a scalable solution for businesses to handle increased data flow and user demand without compromising performance.
  • Flexibility: APIs offer flexibility by allowing developers to create custom applications or add functionalities to existing apps without reinventing the wheel.
  • Enhanced User Experience: APIs enable developers to create seamless user experiences by integrating third-party services and data into their applications.
  • Automation: APIs facilitate automation by allowing systems to interact and perform tasks without manual intervention, improving efficiency and reducing errors.
  • Business Opportunities: APIs open up new business opportunities by allowing companies to monetize their data and services through partnerships and integrations.
  • Innovation: APIs foster innovation by providing developers with access to a wide range of resources, tools, and functionalities, enabling them to create innovative applications and services.

8 Cons of API

  • Security Risks: APIs can create security vulnerabilities if not properly secured, potentially exposing sensitive data or allowing unauthorized access to systems.
  • Dependency on Third Parties: Integrating third-party APIs means relying on their availability, reliability, and updates, which can be a potential risk if the API provider experiences issues or discontinues their services.
  • Complexity: Working with APIs can be complex, requiring developers to understand the API documentation, endpoints, authentication methods, and potential limitations.
  • Versioning Challenges: As APIs evolve over time, maintaining backward compatibility and managing different versions can be challenging, especially when multiple applications depend on the API.
  • Performance Impact: Poorly designed or inefficient APIs can impact the performance of the systems or applications that rely on them, leading to slower response times or system failures.
  • Integration Effort: Integrating APIs into existing systems or applications may require significant time, effort, and resources, especially if the systems have different architectures or technologies.
  • API Deprecation: APIs can be deprecated or retired by the provider, requiring developers to update their applications or find alternative solutions, which can be time-consuming and disruptive.
  • Cost: Some APIs may come with licensing or usage fees, especially for premium services or high-volume usage, which can add to the overall cost of developing and maintaining applications.

TOP 12 Tech facts and history of creation and versions about API Development

  • API stands for Application Programming Interface.
  • The concept of APIs dates back to the early days of computing in the 1960s.
  • In 1970, IBM introduced the concept of “System/360” APIs, which allowed applications to interact with the operating system.
  • The first modern web API was introduced by Salesforce.com in 2000, enabling developers to integrate their applications with Salesforce’s CRM platform.
  • Representational State Transfer (REST) is a widely used architectural style for designing APIs, introduced by Roy Fielding in his 2000 Ph.D. dissertation.
  • In 2006, Twitter launched its API, which played a significant role in the platform’s rapid growth and popularity.
  • Google Maps API, released in 2005, revolutionized online mapping by allowing developers to embed maps into their applications.
  • GraphQL, developed by Facebook in 2012 and released publicly in 2015, introduced a new way of querying and manipulating data in APIs.
  • OpenAPI Specification (formerly known as Swagger) is a widely adopted standard for defining and documenting RESTful APIs.
  • API versioning is crucial for maintaining backward compatibility and allowing developers to adopt new features gradually.
  • APIs have played a vital role in enabling the rise of mobile applications by providing standardized interfaces for accessing backend services.
  • The use of API gateways has gained popularity in recent years, providing a centralized entry point for managing and securing API traffic.

What are top API instruments and tools?

  • Postman: Postman is a popular API development environment that allows developers to design, test, and document APIs. It was first released in 2012 and has since become one of the most widely used API tools. Postman offers a user-friendly interface, making it easy to create API requests, organize them into collections, and share them with team members. It also provides advanced features like automated testing, mock servers, and API documentation generation.
  • Swagger: Swagger, now known as the OpenAPI Specification, is an open-source framework for designing, building, and documenting RESTful APIs. It was initially developed in 2010 and has gained significant adoption in the API community. Swagger provides a concise and machine-readable format for describing APIs, making it easier for developers to understand and interact with them. It also offers tools for generating client SDKs, server stubs, and interactive API documentation.
  • Apigee: Apigee is an API management platform that helps organizations build, secure, and scale their APIs. It was founded in 2004 and has established itself as a leader in the API management space. Apigee offers a comprehensive set of tools for API lifecycle management, including API design, security, analytics, and monetization. It also provides developer portal capabilities, enabling organizations to create self-service API portals for their developer communities.
  • Amazon API Gateway: Amazon API Gateway is a fully managed service that makes it easy to create, manage, and secure APIs. It was launched by Amazon Web Services (AWS) in 2015 and has since become a popular choice for building serverless architectures and microservices-based applications. Amazon API Gateway supports RESTful and WebSocket APIs, and it integrates seamlessly with other AWS services like AWS Lambda, AWS IAM, and AWS CloudTrail.
  • Twilio: Twilio is a cloud communications platform that provides APIs for building voice, video, and messaging applications. It was founded in 2008 and has grown rapidly to become one of the leading providers of communication APIs. Twilio’s APIs enable developers to integrate voice and messaging capabilities into their applications using simple RESTful APIs. It supports various programming languages and offers features like phone number provisioning, call recording, and SMS verification.
  • GraphQL: GraphQL is an open-source query language for APIs and a runtime for executing those queries. It was developed by Facebook in 2015 and has gained popularity for its flexibility and efficiency in fetching data from APIs. Unlike traditional REST APIs, which often suffer from over-fetching or under-fetching of data, GraphQL allows clients to request only the data they need in a single request. It also provides powerful features like real-time updates and introspection.

TOP 10 API Related Technologies

  • Python

    Python is a widely used programming language for API software development. It offers a clean and readable syntax, making it easy to learn and write code. Python has a vast ecosystem of libraries and frameworks, such as Django and Flask, which simplify the development process.

  • Node.js

    Node.js is a popular JavaScript runtime environment that allows developers to build scalable and high-performance APIs. It uses an event-driven, non-blocking I/O model, making it efficient for handling concurrent requests. Node.js frameworks like Express.js provide a streamlined approach to building APIs.

  • Java

    Java is a versatile language that has been widely used for API development. It offers strong support for object-oriented programming and has a vast ecosystem of libraries and frameworks. Java frameworks like Spring Boot provide robust tools for building and deploying APIs.

  • Ruby

    Ruby is a dynamic and expressive programming language that is often used for API development. It has a simple and readable syntax, making it easy to write clean and maintainable code. Ruby on Rails, a popular framework, provides a convention-over-configuration approach for building APIs.

  • PHP

    PHP is a widely used scripting language for web development, including API development. It has a large and active community, making it easy to find resources and support. PHP frameworks like Laravel offer convenient features for building APIs, such as routing and database integration.

  • Go

    Go, also known as Golang, is a statically typed language designed for building efficient and scalable software. It has gained popularity for API development due to its simplicity, performance, and built-in support for concurrency. Go frameworks like Gin provide a lightweight and fast solution for building APIs.

  • C#

    C# is a powerful and versatile programming language developed by Microsoft. It is commonly used for building APIs on the .NET platform. ASP.NET Core, a cross-platform framework, offers a comprehensive set of tools for building RESTful APIs with C#.

How and where is API used?

Case NameCase Description
1. Streamlining E-commerce OperationsAPI development can play a crucial role in streamlining e-commerce operations. By integrating APIs with various systems like inventory management, payment gateways, and shipping providers, businesses can automate processes such as order fulfillment, inventory updates, and payment processing. This not only improves operational efficiency but also reduces the chances of errors and enhances customer satisfaction.
2. Enhancing Mobile App FunctionalityAPI development enables developers to enhance the functionality of mobile apps by integrating with third-party services. For example, integrating APIs for social media platforms allows users to log in with their social media accounts, share content, and access their social network directly from the app. This integration enhances user experience and expands the app’s capabilities without the need to build everything from scratch.
3. Creating Custom IntegrationsAPI development allows businesses to create custom integrations between different software systems and applications. For instance, integrating CRM (Customer Relationship Management) software with email marketing tools enables seamless synchronization of customer data, automates email campaigns, and provides valuable insights for targeted marketing strategies. Custom integrations through APIs help businesses optimize their workflows and maximize productivity.
4. Building IoT ApplicationsAPI development plays a significant role in building Internet of Things (IoT) applications. APIs enable communication and data exchange between different IoT devices and systems, allowing developers to create innovative solutions. For example, APIs can be used to connect smart home devices like thermostats, cameras, and lighting systems, enabling users to control and monitor their homes remotely.
5. Enabling Data Analysis and VisualizationAPI development facilitates data analysis and visualization by allowing seamless access to data from various sources. For instance, APIs provided by social media platforms allow businesses to gather data about user interactions, engagement metrics, and demographics. This data can be utilized to generate insights, track performance, and make data-driven decisions.
6. Facilitating Collaboration and CommunicationAPI development enables collaboration and communication between different software applications and platforms. For example, integrating APIs for project management tools with communication tools allows teams to streamline their workflows, share information, and collaborate effectively. This integration eliminates the need for manual data transfer and improves overall team productivity.
7. Automating Business ProcessesAPI development plays a vital role in automating business processes by connecting various software systems and enabling seamless data exchange. For example, integrating APIs between an e-commerce platform and a shipping provider automates the shipping process, including label generation, tracking updates, and notifications to customers. By automating these processes, businesses can save time, reduce errors, and improve overall efficiency.

Hard skills of a API Developer

As an API Developer, having a strong set of hard skills is crucial for success in the field. Here are the key hard skills required at different levels of expertise:


  • Programming Languages: Proficiency in languages such as Java, Python, or Ruby.
  • API Design: Understanding of RESTful principles and ability to design well-structured APIs.
  • Web Development: Knowledge of HTML, CSS, and JavaScript for building web-based APIs.
  • API Documentation: Ability to create clear and comprehensive documentation for APIs.
  • Version Control: Familiarity with Git or other version control systems for managing code.


  • Advanced Programming: Experience in advanced programming concepts and frameworks like Node.js or Django.
  • API Integration: Ability to integrate APIs with external systems or third-party services.
  • Security: Understanding of API security protocols such as OAuth or JWT.
  • Performance Optimization: Knowledge of techniques to optimize API performance and scalability.
  • Testing: Proficiency in unit testing and API testing frameworks like Postman or JUnit.
  • Database Management: Experience in working with databases and SQL queries.
  • Debugging and Troubleshooting: Ability to debug and troubleshoot API-related issues.


  • Architecture Design: Expertise in designing scalable and robust API architectures.
  • Microservices: Knowledge of microservices architecture and its implementation.
  • DevOps: Familiarity with deployment pipelines, continuous integration, and infrastructure automation.
  • Performance Monitoring: Ability to monitor API performance and identify bottlenecks.
  • Code Review: Experience in conducting code reviews and providing constructive feedback.
  • Leadership: Demonstrated leadership skills and the ability to mentor junior developers.
  • Client Relationship: Strong communication and client management skills.
  • Agile Methodology: Proficiency in Agile development methodologies like Scrum or Kanban.

Expert/Team Lead

  • API Strategy: Ability to define and execute API strategies for complex business requirements.
  • Enterprise Integration: Experience in integrating APIs in large-scale enterprise systems.
  • Performance Optimization: Deep understanding of advanced optimization techniques for high-volume APIs.
  • Security Architecture: Expertise in designing secure, multi-layered API security architectures.
  • Infrastructure Design: Knowledge of infrastructure design patterns for highly available and fault-tolerant APIs.
  • Team Management: Experience in leading and managing API development teams.
  • Vendor Management: Ability to evaluate and manage third-party API providers.
  • Industry Knowledge: Keeping up-to-date with the latest industry trends and best practices in API development.
  • Strategic Planning: Capability to align API development with business goals and objectives.
  • Problem Solving: Strong analytical and problem-solving skills to tackle complex API challenges.
  • Business Acumen: Understanding of business processes and the ability to align APIs with business needs.

Let’s consider Difference between Junior, Middle, Senior, Expert/Team Lead developer roles.

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior0-2 yearsAssist in basic coding tasks, bug fixing, and testing. Learn and gain experience in various programming languages and frameworks. Collaborate with senior developers to understand project requirements.$50,000 – $70,000
Middle3-5 yearsIndependently develop software modules, enhance existing code, and participate in code reviews. Collaborate with cross-functional teams to design and implement solutions. Mentor junior developers and provide technical guidance.$70,000 – $90,000
Senior6-10 yearsLead development projects, architect software solutions, and provide technical expertise. Collaborate with stakeholders to gather requirements and create technical specifications. Mentor and guide junior and middle developers. Conduct code reviews and ensure high-quality code.$90,000 – $120,000
Expert/Team Lead10+ yearsLead and manage a team of developers, set technical direction, and make strategic decisions. Provide guidance on complex technical challenges and oversee project execution. Collaborate with stakeholders to define project goals and deliverables. Ensure high-quality code and drive innovation within the team.$120,000 – $150,000+

Cases when API does not work

  1. The API may not work if there is a problem with the server hosting the API. This could be due to server maintenance, network connectivity issues, or server downtime. It is important to check the status of the server and ensure it is functioning properly.
  2. An API may not work if the API key or authentication credentials are invalid or not provided. APIs often require a valid API key or authentication token to authorize access. Without the correct credentials, the API will not allow access to its resources.
  3. If the API documentation is outdated or poorly written, it can lead to confusion and difficulties in implementing the API. Inaccurate or incomplete documentation may result in incorrect usage of the API, causing it to not work as expected.
  4. Changes to the API’s endpoints or parameters can also cause it to stop working. APIs evolve over time, and updates to the API may introduce breaking changes that are not backward compatible. It is essential to stay informed about any updates or changes to the API and adjust the code accordingly.
  5. If the API has rate limiting restrictions, exceeding the allowed number of requests within a given time frame can result in the API not working. Rate limiting is often imposed to prevent abuse and ensure fair usage of the API. Developers should be mindful of the API’s rate limits and implement appropriate measures to avoid exceeding them.
  6. In some cases, the API may not work due to compatibility issues with the programming language or framework being used. Certain APIs may be designed specifically for a particular programming language or require specific dependencies that need to be installed. It is crucial to ensure compatibility between the API and the development environment.
  7. Network connectivity issues can also prevent an API from working. If there are problems with the internet connection or firewall settings, it may hinder the communication between the client and the API server, causing the API to fail.
  8. If the API relies on third-party services or data sources, any issues or disruptions with those services can impact the functionality of the API. For example, if the API relies on a weather service to provide weather data, any downtime or issues with that weather service can affect the API’s ability to retrieve accurate data.
  9. Lastly, bugs or issues within the API itself can cause it to not work correctly. These bugs can range from minor glitches to critical errors that prevent the API from functioning altogether. In such cases, it is important to report the issue to the API provider, who can then work on resolving the problem.

Soft skills of a API Developer

Soft skills are essential for API Developers as they play a crucial role in effectively collaborating with cross-functional teams, understanding user requirements, and delivering high-quality API solutions. Here are the soft skills required at different levels of expertise:


  • Effective Communication: Ability to convey ideas clearly and concisely, and actively listen to stakeholders.
  • Adaptability: Willingness to learn new technologies and adapt to changing project requirements.
  • Problem-Solving: Capability to analyze issues, troubleshoot problems, and propose practical solutions.
  • Teamwork: Collaboration with team members to achieve common goals and contribute to a positive work environment.
  • Attention to Detail: Paying close attention to small details to ensure accuracy and minimize errors in API development.


  • Leadership: Taking ownership of API development projects and guiding junior developers in achieving project objectives.
  • Time Management: Ability to prioritize tasks, meet deadlines, and efficiently manage workload.
  • Conflict Resolution: Skill to identify and resolve conflicts within the team or with stakeholders in a diplomatic manner.
  • Client-Focused Approach: Understanding client needs and aligning API solutions accordingly to ensure client satisfaction.
  • Presentation Skills: Ability to effectively present API solutions to stakeholders and gather feedback.
  • Collaboration: Working collaboratively with cross-functional teams to integrate APIs into various systems.
  • Continuous Learning: Actively seeking opportunities to learn and adapt to emerging API technologies and industry trends.


  • Mentorship: Guiding and mentoring junior and middle-level developers, sharing knowledge and best practices.
  • Strategic Thinking: Ability to understand the bigger picture and align API development with overall business goals.
  • Negotiation Skills: Skill to negotiate contracts, agreements, and API integrations with external partners.
  • Quality Assurance: Ensuring high-quality API development by implementing testing and code review processes.
  • Project Management: Overseeing API development projects, managing resources, and ensuring timely delivery.
  • Customer Relationship Management: Building and maintaining strong relationships with clients and understanding their evolving needs.
  • Innovation: Identifying opportunities for API innovation and driving the development of new features and functionalities.
  • Technical Documentation: Creating comprehensive and clear API documentation for developers and stakeholders.

Expert/Team Lead

  • Strategic Leadership: Developing API strategies, setting technical direction, and providing guidance to the API development team.
  • Business Acumen: Understanding business requirements, market trends, and translating them into API solutions that drive business growth.
  • Change Management: Managing and leading API-related organizational changes, ensuring smooth transitions and minimal disruptions.
  • Risk Management: Identifying and mitigating risks associated with API development and integration processes.
  • Vendor Management: Overseeing relationships with API vendors, evaluating their offerings, and making informed decisions.
  • Enterprise Architecture: Integrating APIs into the overall enterprise architecture, ensuring scalability, security, and performance.
  • Strategic Partnerships: Building strategic partnerships with external organizations to enhance API capabilities and expand business opportunities.
  • Industry Knowledge: Maintaining deep knowledge of industry trends, emerging technologies, and best practices in API development.
  • Data Privacy and Security: Ensuring compliance with data privacy regulations and implementing robust security measures for API solutions.
  • Performance Optimization: Optimizing API performance by analyzing and fine-tuning API response times, scalability, and efficiency.
  • Team Management: Leading and managing a team of API developers, fostering collaboration, and nurturing talent.

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