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Rogerio F., Senior Solidity Developer

Bauru, Brazil
Last Updated: 4 Jul 2023

- 4 years of experience in Ethereum blockchain and Solidity programming. - 2 years of experience in C , Python programming. - Highly professional blockchain developer with comprehensive accomplishments applying high-security smart contracts to ensure success and achieve goals. - Strong experience in EVM-compatible smart contracts development. Demonstrated success developing and seamlessly executing smart contracts in complex DeFi and DEX structures. - Upper-Intermediate English - Available ASAP

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Anton B, React Developer

Minsk, Belarus
Last Updated: 4 Jul 2023

Front-end developer with 2.5 years of experience building and maintaining responsive websites. Proficient in HTML, CSS, JS, React. Have good understanding of application development process as well as testing.

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Inna H., QA Automation Engineer

Last Updated: 4 Jul 2023

- Automation QA engineer with 5+ years of experience - Writing automated tests on C# (Selenium WebDriver) - Upper-intermediate English - Available ASAP

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QA   5 yr.

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Last Updated: 26 Feb 2024

Software engineer with a comprehensive background in full-stack and blockchain development. Proficient in languages like Rust, Solidity, TypeScript, C#, and C++, with 3 years in JavaScript and Solidity. Strong focus on blockchain ecosystems, having utilized Solidity, Ink!, and Substrate across various innovative projects, including a SPL-token creation using Solana and a cybersecurity platform for Earth satellites leveraging blockchain tech. Experienced in both front-end and back-end paradigms, employing .NET 7, ASP.NET, and React, and tools like Docker and Swagger for deployment and API management. Responsible for leading the development of complex web3 applications, such as a staking platform and a branded shoe online store, showcasing a strong understanding of SDLC, including testing with tools like Hardhat and Foundry. The engineer's project roles demonstrate an ability to handle full-stack responsibilities and a proven track record in delivering robust, scalable applications in diverse domains such as game development, e-commerce, and NFTs.

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JavaScript   3 yr.


TypeScript   3 yr.


Rust   3 yr.


Solidity   3 yr.



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Yuri C., Blockchain Developer

Last Updated: 4 Jul 2023

- Development and security audit of smart contracts for EVM compatible blockchains. - Deep experience in the development of NFT (ERC721/1155) tokens and in the Defi industry. - Upper-intermediate English. - Available ASAP.

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Our journey starts with a 30-minute discovery call to explore your project challenges, technical needs, and team diversity. Meet Carefully Matched Chai 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 Chai developer on board with a trial period to confirm that you’ve hired the right one. There are no termination fees or hidden costs.

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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 Chai 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

What are top Chai instruments and tools?

  • Chai.js: Chai.js is a popular assertion library for JavaScript that provides a readable and expressive syntax for creating assertions and expectations in test cases. It is widely used in conjunction with testing frameworks like Mocha and Jasmine to write test suites for web applications. Chai.js was first released in 2011 and has since become one of the go-to tools for testing JavaScript code.
  • Chai HTTP: Chai HTTP is an extension of the Chai.js library that allows developers to make HTTP requests and write assertions on the responses. It provides a fluent API for making requests and asserting on the results, making it easy to test API endpoints and verify the behavior of HTTP-based services. Chai HTTP is widely used for testing server-side code and RESTful APIs.
  • Chai Spies: Chai Spies is a plugin for Chai.js that enables developers to create and use test spies in their test cases. Test spies are functions that record information about their invocations, such as the number of times they were called and the arguments they were called with. Chai Spies provides a clean syntax for creating spies and asserting on their behavior, allowing developers to easily verify that certain functions were called correctly during the execution of their code.
  • Chai DOM: Chai DOM is another extension of Chai.js that adds support for asserting on the properties and attributes of HTML elements in the Document Object Model (DOM). With Chai DOM, developers can write assertions like `expect(element).to.have.class(‘active’)` or `expect(element).to.have.property(‘textContent’, ‘Hello’)` to verify the state of HTML elements in their tests. This tool is particularly useful when testing web applications that manipulate the DOM.
  • Chai As Promised: Chai As Promised is a plugin for Chai.js that enhances its capabilities for testing asynchronous code that uses promises. It provides a set of chainable assertions for working with promises, allowing developers to write expressive and readable tests for async operations. With Chai As Promised, you can easily assert on the fulfillment or rejection of promises, as well as their eventual values.
  • Chai-Immutable: Chai-Immutable is an extension of Chai.js designed specifically for testing applications that use immutable data structures, such as those provided by libraries like Immutable.js or Redux. It adds a set of assertions tailored to immutable data, allowing developers to write tests that verify the correctness of their code when dealing with immutable data collections and updates.
  • Chai Subset: Chai Subset is a plugin for Chai.js that provides assertions for checking whether an object is a subset of another object. It allows developers to write tests that verify if an object contains a specific subset of properties and values, providing a convenient way to ensure the correctness of complex data structures.

TOP 10 Chai Related Technologies

  • Python

    Python is a popular programming language for Chai software development due to its simplicity, readability, and extensive libraries. It allows developers to write clear and concise code, making it a favorite among beginners and experienced developers alike.

  • React

    React is a JavaScript library that is widely used for building user interfaces in Chai software development. It offers component-based architecture, virtual DOM, and efficient rendering, making it a popular choice for creating interactive and responsive web applications.

  • Node.js

    Node.js is a runtime environment that allows developers to run JavaScript code on the server side. It provides a non-blocking, event-driven architecture, making it ideal for building scalable and high-performance Chai software applications.

  • Git

    Git is a version control system that enables developers to track changes in their Chai software codebase. It offers features like branch management, collaboration, and easy rollback, making it an essential tool for software development teams.

  • Docker

    Docker is a containerization platform that allows developers to package their Chai software applications and dependencies into portable containers. It provides an efficient and consistent development and deployment environment, enabling seamless scalability and deployment.

  • MySQL

    MySQL is a widely used open-source relational database management system. It offers robust data storage and retrieval capabilities, making it a popular choice for Chai software applications that require structured data storage and efficient querying.

  • AWS

    Amazon Web Services (AWS) is a cloud computing platform that provides a wide range of services for Chai software development. It offers scalable infrastructure, storage, and computing power, making it an ideal choice for hosting and deploying Chai software applications.

TOP 14 Tech facts and history of creation and versions about Chai Development

  • Chai Development is a JavaScript-based testing framework created in 2010 by Kent C. Dodds.
  • Chai follows the Behavior-Driven Development (BDD) methodology, providing a readable and expressive syntax for writing tests.
  • The first stable version of Chai, 1.0.0, was released in August 2011, introducing the expect and should assertion styles.
  • In 2013, Chai introduced the third assertion style called assert, offering a more traditional approach to writing assertions.
  • Chai’s assert style provides a wide range of assertion methods, including deep equality checks and type checks.
  • Chai’s expect style allows for expressive and chainable assertions using natural language constructs.
  • The should style of Chai extends the Object.prototype, enabling assertions to be directly called on objects.
  • Chai supports various plugins and integrations, allowing developers to extend its functionality based on their specific needs.
  • Chai integrates well with popular testing frameworks like Mocha, Jasmine, and Jest.
  • Chai is widely used in the JavaScript community and has over 9 million weekly downloads on npm as of 2021.
  • Chai’s open-source nature and active community contribute to its continuous improvement and feature enhancements.
  • Chai’s extensive documentation and comprehensive API make it easy for developers to get started and write effective tests.
  • Chai is compatible with both Node.js and browser environments, making it versatile for testing applications across different platforms.
  • Chai’s flexible assertion styles and customization options make it suitable for a wide range of testing scenarios.
  • Chai’s consistent updates and version releases ensure that it keeps up with the evolving JavaScript ecosystem and best practices.

Pros & cons of Chai

8 Pros of Chai

  • Rich Flavor: Chai offers a unique and delightful flavor profile that combines spices like cinnamon, cardamom, ginger, and cloves with the bold taste of black tea.
  • Health Benefits: Chai is packed with antioxidants, which help fight inflammation and protect against chronic diseases. It also contains black tea, which has been linked to improved heart health and cognitive function.
  • Energy Boost: Chai contains caffeine from black tea, providing a natural energy boost that can help increase focus and productivity.
  • Digestive Aid: The spices in chai, such as ginger and cardamom, have been traditionally used to aid digestion and soothe gastrointestinal discomfort.
  • Warm and Comforting: Chai is often enjoyed hot, making it a comforting beverage during colder months or when you need a cozy pick-me-up.
  • Versatility: Chai can be customized to suit individual preferences by adjusting the amount of spices, sweetness, and milk used. It can be enjoyed as a traditional hot beverage or even used as a base for desserts and baked goods.
  • Easy to Make at Home: Chai can be easily prepared at home using simple ingredients like tea, spices, milk, and sweeteners. This allows you to control the quality of ingredients and customize the flavor to your liking.
  • Cultural Significance: Chai holds deep cultural significance in many countries, particularly in South Asia. Enjoying a cup of chai can be a way to connect with and appreciate diverse cultures.

8 Cons of Chai

  • Caffeine Content: While the caffeine in chai can provide an energy boost, it may not be suitable for individuals who are sensitive to caffeine or need to limit their intake.
  • Sugar Content: Many commercially available chai drinks or premixes can be high in added sugars, which may contribute to excessive calorie consumption and potential health issues if consumed in excess.
  • Individual Preferences: The strong flavor and spices in chai may not appeal to everyone’s taste buds. Some individuals may find it too spicy or overpowering.
  • Staining Potential: Chai can sometimes leave stains on teeth or clothing due to its dark color and the presence of spices like turmeric.
  • Availability: In some regions, finding authentic chai or the necessary ingredients for homemade chai may be challenging.
  • Preparation Time: While chai can be made at home, it does require some preparation time to steep the tea and spices, which may not be convenient for those with busy schedules.
  • Temperature Sensitivity: Chai is typically enjoyed hot, so it may not be as refreshing or suitable for consumption during hot weather or in certain climates.
  • Individual Sensitivities: Some individuals may have allergies or sensitivities to certain spices or ingredients commonly found in chai, such as ginger or dairy milk.

How and where is Chai used?

Case NameCase Description
Smart Home AutomationChai Development can be used to create smart home automation systems that allow users to control various devices such as lights, thermostats, security systems, and appliances through a central hub or mobile app. This enables users to conveniently manage their home environment, save energy, and enhance security.
Healthcare MonitoringChai Development can be utilized in healthcare monitoring systems to collect and analyze patient data, such as heart rate, blood pressure, and sleep patterns. This can help doctors and caregivers monitor patients remotely and detect any abnormalities or changes in health, enabling timely interventions and improved patient care.
Industrial AutomationChai Development can be applied in industrial automation to optimize the control and monitoring of manufacturing processes. It can enable real-time data analysis, predictive maintenance, and remote monitoring of equipment, leading to increased productivity, reduced downtime, and cost savings for industrial operations.
Smart AgricultureChai Development can be used in smart agriculture systems to monitor and control various aspects of farming, such as soil moisture levels, temperature, and crop health. This enables farmers to make informed decisions regarding irrigation, fertilization, and pest control, resulting in higher crop yields and resource efficiency.
Intelligent TransportationChai Development can be employed in intelligent transportation systems to optimize traffic flow, enhance road safety, and improve public transportation services. It can facilitate real-time monitoring of traffic conditions, intelligent traffic signal control, and the integration of smart sensors in vehicles for improved navigation and safety.
Energy ManagementChai Development can be utilized in energy management systems to monitor and control energy usage in buildings, factories, and cities. It can enable real-time tracking of energy consumption, automated demand response, and integration with renewable energy sources, leading to energy savings, reduced carbon footprint, and increased sustainability.
E-commerce PersonalizationChai Development can be applied in e-commerce platforms to enhance personalized user experiences. It can enable product recommendations based on user preferences and behavior analysis, personalized marketing campaigns, and efficient inventory management, resulting in increased customer satisfaction and higher conversion rates.
Financial Fraud DetectionChai Development can be used in financial institutions to detect and prevent fraudulent activities. It can analyze large volumes of transaction data, identify patterns and anomalies, and generate real-time alerts for suspicious activities. This helps in mitigating financial risks, protecting customer accounts, and maintaining the integrity of the financial system.
Social Media AnalyticsChai Development can be employed in social media analytics to analyze user behavior, sentiment analysis, and trending topics. It can provide insights into customer preferences, enable targeted marketing strategies, and identify emerging trends, allowing businesses to make data-driven decisions and stay competitive in the digital landscape.
Virtual AssistantsChai Development can be utilized in developing virtual assistants that provide personalized assistance to users. It can understand natural language queries, perform tasks such as scheduling appointments, answering inquiries, and controlling smart home devices. This enhances user productivity and convenience in various domains, including personal and professional settings.

Cases when Chai does not work

  1. Unsupported JavaScript Syntax: Chai may not work properly if the JavaScript code uses unsupported syntax. For example, if the code relies heavily on arrow functions or async/await, Chai may not be able to properly evaluate assertions.
  2. Browser Compatibility: Chai is primarily designed for use in Node.js environments. While it can also be used in the browser, certain features may not work as expected due to differences in JavaScript implementations across browsers.
  3. Incorrect Configuration: Chai requires proper configuration to work correctly. If the configuration settings, such as the assertion style or plugins, are not set up correctly, Chai may not function as intended.
  4. Conflict with Other Libraries: Chai may conflict with other assertion libraries or testing frameworks if they are used together in the same codebase. This can lead to unexpected behavior or assertion failures.
  5. Outdated Version: Using an outdated version of Chai can result in compatibility issues with newer JavaScript features or changes in the testing ecosystem. It is important to keep Chai up to date to avoid potential problems.

Hard skills of a Chai Developer

Chai is a popular JavaScript assertion library that is widely used for testing Node.js applications. To excel as a Chai Developer, you need to have a strong set of hard skills. Here are the hard skills required for Chai Developers at different experience levels:


  • JavaScript: Proficiency in JavaScript is essential for a Chai Developer. Understanding core concepts like variables, functions, loops, and objects is necessary for writing effective test cases.
  • Chai: A solid understanding of the Chai library is crucial for a Chai Developer. Familiarity with various assertion styles, such as expect, should, and assert, is important for writing expressive and accurate tests.
  • Mocha: Mocha is a popular testing framework often used in conjunction with Chai. Junior Chai Developers should have a basic understanding of Mocha and how to structure test suites and test cases using it.
  • Debugging: Troubleshooting and debugging skills are vital for a Chai Developer. Being able to identify and fix issues in test cases or code is essential for maintaining reliable and robust testing.
  • Version Control: Proficiency in version control systems like Git is necessary for collaborating with other developers and managing code changes efficiently.


  • Test-Driven Development (TDD): A solid understanding of Test-Driven Development principles and practices is expected from a Middle Chai Developer. Being able to write tests first and then implement code based on those tests is a valuable skill.
  • Continuous Integration/Continuous Deployment (CI/CD): Familiarity with CI/CD practices and tools like Jenkins or Travis CI is important for automating the testing and deployment process.
  • Performance Testing: Middle Chai Developers should have a basic understanding of performance testing concepts and tools like Apache JMeter or LoadRunner to ensure the scalability and efficiency of applications.
  • Code Review: Having experience in conducting code reviews and providing constructive feedback to team members is a valuable skill for a Middle Chai Developer.
  • API Testing: Understanding how to test APIs using tools like Postman or cURL is important for Middle Chai Developers, as APIs play a crucial role in modern web applications.
  • Database Knowledge: Basic knowledge of databases and SQL is beneficial for Middle Chai Developers, as it allows them to write tests that involve database interactions.
  • Security Testing: Awareness of security testing practices and techniques, such as OWASP Top 10 vulnerabilities, is expected from a Middle Chai Developer.


  • Advanced JavaScript: Senior Chai Developers should have an in-depth understanding of JavaScript, including advanced concepts like closures, prototypes, and asynchronous programming.
  • Design Patterns: Familiarity with software design patterns, such as Factory, Singleton, and Observer, is important for Senior Chai Developers to write clean and maintainable test code.
  • Code Optimization: Being able to optimize test code for performance and efficiency is a valuable skill for a Senior Chai Developer.
  • Containerization: Familiarity with containerization technologies like Docker and orchestration tools like Kubernetes is important for Senior Chai Developers to set up and manage testing environments.
  • Testing Frameworks: Senior Chai Developers should have experience with other testing frameworks like Jasmine or Jest, allowing them to choose the most suitable tool for different project requirements.
  • Leadership: Senior Chai Developers often take on leadership roles, so having strong leadership skills, including the ability to mentor and guide junior team members, is essential.
  • Problem Solving: Senior Chai Developers should excel in problem-solving, being able to identify complex issues and come up with innovative solutions.
  • Performance Optimization: In-depth knowledge of performance optimization techniques, such as caching, lazy loading, and minimizing network requests, is important for Senior Chai Developers.

Expert/Team Lead

  • Architectural Design: Expert Chai Developers and Team Leads should have a strong understanding of software architecture and the ability to design robust testing frameworks and strategies.
  • Test Automation: Expert Chai Developers should have extensive experience in test automation, including setting up and maintaining automated test suites using tools like Selenium or Cypress.
  • DevOps: Familiarity with DevOps practices and tools is important for Expert Chai Developers and Team Leads to ensure smooth integration between development, testing, and deployment processes.
  • Performance Engineering: Expert Chai Developers should have advanced knowledge of performance engineering techniques, including load testing, stress testing, and capacity planning.
  • Agile Methodologies: Expert Chai Developers and Team Leads should have a deep understanding of Agile methodologies and be able to effectively implement them within the testing process.
  • Communication: Excellent communication skills are essential for Expert Chai Developers and Team Leads to collaborate with stakeholders, developers, and other team members effectively.
  • Project Management: Expert Chai Developers often take on project management responsibilities, so having strong project management skills, including planning, estimation, and resource allocation, is important.
  • Quality Assurance: Expert Chai Developers should have a comprehensive understanding of quality assurance processes and best practices to ensure the delivery of high-quality software.
  • Continuous Testing: Expert Chai Developers and Team Leads should champion continuous testing practices and drive the adoption of automation throughout the software development lifecycle.
  • Performance Monitoring: Expert Chai Developers should be proficient in using performance monitoring tools like New Relic or Datadog to analyze application performance and identify bottlenecks.
  • Technical Writing: Expert Chai Developers should have excellent technical writing skills to document test cases, test plans, and testing strategies effectively.

Soft skills of a Chai Developer

Soft skills are non-technical skills that are important for a Chai Developer to possess. These skills help developers effectively communicate, collaborate, and adapt to different situations in the workplace.


  • Communication: Ability to effectively communicate ideas and technical concepts to team members and stakeholders.
  • Teamwork: Willingness to work collaboratively with other developers and team members to achieve project goals.
  • Problem-solving: Capacity to analyze and solve software-related issues, and to learn from mistakes.
  • Adaptability: Ability to quickly learn new technologies and adapt to changing project requirements.
  • Time Management: Skill to prioritize tasks and manage time effectively to meet project deadlines.


  • Leadership: Ability to take charge of a project or team and provide guidance and direction to junior developers.
  • Critical Thinking: Capacity to analyze complex problems and propose innovative solutions.
  • Collaboration: Skill to work effectively with cross-functional teams and stakeholders.
  • Conflict Resolution: Ability to resolve conflicts and disagreements within the team in a constructive manner.
  • Attention to Detail: Strong focus on ensuring accuracy and quality in coding and documentation.
  • Empathy: Capacity to understand and empathize with the needs and perspectives of others.
  • Self-Motivation: Ability to work independently and stay motivated to achieve project goals.


  • Mentoring: Skill to mentor and guide junior and middle developers, sharing knowledge and best practices.
  • Strategic Thinking: Ability to think strategically and align software development with business objectives.
  • Decision-making: Capacity to make informed decisions based on analysis and consideration of various factors.
  • Negotiation: Skill to negotiate and influence stakeholders to reach mutually beneficial agreements.
  • Project Management: Ability to plan, organize, and manage complex software development projects.
  • Conflict Management: Expertise in managing conflicts and resolving issues within the team.
  • Continuous Learning: Commitment to continuous learning and staying updated with the latest industry trends and technologies.
  • Client Management: Skill to effectively manage client relationships and understand their needs and expectations.

Expert/Team Lead

  • Strategic Leadership: Ability to provide strategic direction and lead a team of developers towards project success.
  • Innovation: Capacity to drive innovation and explore new technologies and methodologies.
  • Business Acumen: Understanding of business processes and the ability to align software development with business goals.
  • Conflict Resolution: Expertise in resolving complex conflicts and finding win-win solutions.
  • Technical Expertise: Deep knowledge and expertise in Chai development and related technologies.
  • Risk Management: Skill to identify and mitigate risks associated with software development projects.
  • Stakeholder Management: Ability to effectively manage relationships with various stakeholders, including clients and senior management.
  • Team Building: Skill to build and nurture high-performing teams through effective recruitment and team development strategies.
  • Strategic Planning: Capacity to develop long-term strategies and roadmaps for software development projects.
  • Quality Assurance: Expertise in ensuring high-quality software deliverables through rigorous testing and quality control processes.
  • Communication: Excellent communication skills, including the ability to effectively communicate complex technical concepts to both technical and non-technical stakeholders.

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