Hire Vetted Web Application Engineers at Upstaff - Page 13
All vetted software engineers you need to build AI, Web3, and data Products.
- Dedicated Full-time commitment for long-term or Time& Material for shorter or ongoing support
- Europe, Israel, LatAm, United States, Asia geography coverage
- Remote and hybrid engagement
- Trial period, no termination fees or hidden costs for transparent and risk-free onboarding.
Web Application
All
Web Application
Data and Analytics
Cloud and Operations
Mobile Application
Blockchain
Digital Platforms
Design and Creative
Quality Assurance
Project Management
Desktop Application
Marketing and SEO
Scripting and Automation
Embedded Systems
Writing and Translation
Low-Code and No-Code
GameDev
Industrial Engineering
JavaScript 1yr.
TypeScript 1yr.
React 1yr.
React Native 1yr.
Node.js 1yr.
Full Stack Developer with 1+ years' experience specializing in MERN stack and cross-platform mobile applications. Proficient in JavaScript, TypeScript, React, React Native, Node.js, and backend API development with Express.js. Experienced in implementing OTP authentication, role-based access, and integrating payment gateways like PhonePe. Holds a Bachelor’s degree in Information Technology and skilled in database management using SQL, MySQL, PostgreSQL, Firebase, and Supabase. Delivered scalable, production-ready solutions including a published Google Play Store app and a secure travel booking platform.
Python 1yr.
JavaScript 1yr.
TypeScript 1yr.
Go 1yr.
Software engineer with robust backend expertise, specializing in Go, Python, TypeScript, and C++. Holds a B.Sc. in Computer Science and Engineering with a 3.8 CGPA from a top Ethiopian university. Experienced in designing secure authentication systems for 5,000+ users using JWT, bcrypt, and Redis, and proficient in OAuth2 integration. Skilled in real-time backend development with WebSockets and Supabase, optimizing system performance by up to 30%. Adept in API design and documentation, enhancing maintainability and cross-team collaboration. Recognized for high-impact contributions in multilingual platform development and data-driven projects, with a strong foundation in algorithms, data structures, and machine learning. Proven ability to mentor and lead, fostering rapid onboarding and agile development practices.
JavaScript 5yr.
Node.js 5yr.
React 5yr.
Vladyslav S. is a Senior JavaScript Developer with 6+ years of experience specializing in React.js, React Native, and Node.js. Experienced with AWS services (Lambda, ECS, RDS, DynamoDB), Firebase, Terraform, and CI/CD pipelines (GitHub Actions, Docker). Proficient in REST APIs, state management (Redux, MobX), and modern frontend frameworks like Next.js and Angular. Strong team collaborator with clean code practices and a focus on scalable architecture.
Python
TypeScript
Architecture and Design Patterns
Software Engineer with expertise in competitive programming, solving 1000+ problems on LeetCode/Codeforce, and demonstrated experience in architecting full-stack applications. Proficient in backend development with Python and Node.js, also skilled in mobile app development using Flutter. Track record includes developing high-performance RESTful APIs that handle 50K+ daily requests and implementing scalable FastAPI backends. Bachelor of Science in progress with a focus on software architecture, AI/ML systems from Adama Science and Technology University. Achievements include ranking 8th in ETCPC National Finals among 200+ teams and excelling in core programming languages and software development methodologies.
JavaScript 5yr.
TypeScript 5yr.
Python 5yr.
SQL 5yr.
HTML5 5yr.
Full-Stack Engineer with 5 years of experience building end-to-end web applications, distributed systems, and modern frontend experiences. Deep expertise in TypeScript, Next.js, Node.js, PostgreSQL, and cloud-native architectures.
Known for shipping high-quality features fast, owning projects from concept to production, and collaborating effectively in remote, async teams. Comfortable with modern tooling, AI-assisted development workflows, and architecting reliable, scalable solutions used by thousands of users.
React 4yr.
Ext JS 2yr.
TypeScript
React Router
Tailwind CSS
Accomplished software engineer with a demonstrated history of working in the information technology and services industry. Skilled in building scalable React applications, with a strong emphasis on front-end development and user experience. An effective leader with experience as a Senior React Developer and Front-end Lead, focusing on defining problems, clarifying specifications, and taking full ownership of projects. Successfully transitioned from earlier sales and operations roles to full-stack development, showcasing versatility and a continuous learning mindset. Education includes a Bachelor of Science in Information Technology with high accolades. Technically proficient in React, TypeScript, Next.js, and modern development tools, with a solid foundation in software development practices.
Python 5yr.
Django REST framework 5yr.
SQL 5yr.
Celery 4yr.
FastAPI
Software engineer with 5 years of experience, excelling in Python/Django backend development and cloud-ready API creation. Proven track record includes architecting a One-Time Setup wizard for Adagrad AI that slashed deployment time by 95%, and designing a SaaS automation platform at Ascent Wellness & Pharma that saved $4,000 monthly and cut manual workflows by 70%. Skilled in advanced databases and cloud operations, with effective system design showcased by the development of a real-time analytics platform that won 3rd place in Maruti Suzuki’s innovation challenge. Holds a Bachelor's degree in Engineering and is proficient in Python, SQL, Django, FastAPI, and a suite of tools and technologies pivotal to modern software development, including Docker, RabbitMQ, and PostgreSQL. Recognized for innovation with awards such as Employee of the Quarter at Adagrad AI.
Flask
Python
Django REST framework
Software engineer leveraging robust academic foundation in Computer Science with hands-on experience in Flask, Python, and Django to build scalable web applications. Proven track record in deploying high-traffic websites leveraging advanced Django framework. Strong comprehension of software development life cycle principles, ready to contribute to cutting-edge technology projects.
React Native
Next.js
React
Redux-Saga
With over 12 years in the software industry, this Senior Full Stack Technical Lead excels in leading teams and architecting a wide range of applications using technologies like ReactJS, NextJS, React Native, Flutter, and NodeJS. This includes proficiency in Redux-Saga and Redux-toolkit for state management, as well as utilizing MaterialUI for UI development. Versed in both front-end and back-end coding languages, methodologies, and databases, they consistently deliver complex projects, such as a BBL Bank web application and managing a city center web portal in Saudi Arabia. Their engineering prowess is backed by a Diploma in Software Engineering and a B.Sc., reinforcing their strong theoretical foundation. Methodically familiar with SDLC and agile practices, they are adept at project management using JIRA and have experience in AWS environments. Additionally, their technical toolkit encompasses CI/CD pipelines with Jenkins and CircleCI, and version control expertise with Github and Gitlab.
TypeScript 5yr.
JavaScript 5yr.
React 3yr.
Playwright
Cypress
A seasoned Software Engineer with over 5 years of specialized experience in frontend development and test automation, as well as a decade in the IT sector. Key competencies include advanced proficiency with React ecosystem, TypeScript, JavaScript, Material UI, Next.js, and familiarity with backend technologies like C#. Proven track record in leading feature initiatives to improve user experiences and operational efficiency, signified by a 40% reduction in duplicate entries and a 60% rise in proactive permission requests at a cloud kitchen operations platform. Expertise in continuous integration and delivery pipelines, demonstrated by contributions to Azure DevOps and CI/CD best practices. Capable of handling both development and QA roles effectively, evidenced by the establishment of test automation frameworks using tools such as Cypress and Playwright. Adept in a variety of programming environments and methodologies, the engineer has successfully orchestrated end-to-end functional testing, test design, and has a strong record of professional advancement as a self-learner and analytical problem solver.
OOP 2yr.
QA Automation
Data Analysis
Software engineer with close to 3 years of experience specializing in AI automation, proficient in Python programming, and experienced in backend systems and workflow automation. Holds a partially completed Bachelor's degree in Business/Commerce with an expected graduation date of March 2026. Demonstrated history of working as a self-employed AI Automation Specialist since March 2023, focusing on data analysis and automation solutions. Notable for applying modern software development practices to optimize operations and improve efficiency.
C/C++/C# 5yr.
ASP.NET Core Framework 5yr.
.NET Core 5yr.
Entity Framework 5yr.
RESTful API 5yr.
Back-end Software Engineer with over 5 years of experience in designing, building, and optimizing complex systems for multi-tenant SaaS platforms, government portals, and HR management applications. Demonstrated proficiency in C#, .NET Core, ASP.NET, and Entity Framework, with a solid grasp of microservices, RESTful API development, and DDD. Proven ability in leading technical teams and executing agile project delivery while maintaining a strong focus on database optimization and robust security protocols. Holds multiple Azure certifications and an education in Computer Science, underlining a deep technical background.
Python 6yr.
Django 6yr.
FastAPI 6yr.
JavaScript
TypeScript
Software Engineer with over 6 years of expertise in high-scale system architecture, proficient in Python (Django, FastAPI, Flask) and front-end technologies (JS/TS, Node.js, React.js). Excelled in DevOps practices with experience in CI/CD automation, AWS infrastructure, and agile methodologies. Played a pivotal role in building a B2B marketplace supporting 10M+ daily users, optimized search performance by 20x, and improved API responsiveness and compliance accuracy in blockchain analytics. Holds a BS in Computer Science.
Python
AWS
C/C++/C#
LLaMA
LangChain
Software Engineer with over 10 years of experience, specializing in AI and full-stack development, demonstrating a strong foundation in computer science with a B.Sc. from the University of Illinois at Chicago. Expert in Python, C#, JavaScript, and cloud technologies such as AWS, Docker, and Kubernetes. Skilled in machine learning frameworks including TensorFlow and PyTorch, further evidenced by AWS Certified Machine Learning and TensorFlow Developer certifications. Proficient in deploying scalable web systems and integrating AI models into high-throughput environments, with a proven track record of enhancing model accuracy and system performance in production-grade systems.
JavaScript 4yr.
TypeScript 4yr.
React 4yr.
Ext JS 4yr.
Node.js 4yr.
Expert Full-stack Developer with advanced capabilities in TypeScript, React/Next.js, and Node.js. Possesses a Bachelor's in Computer Science and has taken specialized courses in Full-stack development and blockchain technologies, reflecting a commitment to continual learning. Proven track record in building and scaling high-load applications, particularly in the healthcare, media, and decentralized tech sectors. Demonstrates strength in creating responsive UIs, implementing complex back-ends, and ensuring high code quality through rigorous testing. Technical skill set includes modern JavaScript frameworks, RESTful and GraphQL APIs, microservices, and cloud services (AWS, GCP), supplemented by practical knowledge of SQL/NoSQL databases, Docker, and CI/CD pipelines. Fluent in essential industry practices and proficient in English and several other languages, making for a versatile asset in international and cross-functional teams.
C/C++/C# 10yr.
ASP.NET MVC
RESTful API
.NET Core
MySQL
['Extensive 10-year background in .NET development, specializing in enterprise-level application design and maintenance.', 'Crucial role in developing large-scale systems at an international organization, demonstrating ability to work under demanding conditions.', 'Expertise in full .NET stack: C#, .NET Core, ASP.NET, coupled with front-end technologies Angular/React, and database management using SQL Server.', 'Proven track record of delivering secure, reliable, and high-performance solutions with a focus on clean, maintainable software architecture.', 'Practical experience in Agile, version control with Git, continuous integration & deployment (CI/CD), and integrating complex third-party systems.', 'Skilled in converting complex business requirements into technical solutions, with clear communication and collaboration in distributed team environments.']
JavaScript 6yr.
TypeScript 6yr.
Node.js 6yr.
React 6yr.
- Full Stack Developer with over 6 years of experience in creating and delivering web applications, with Node.js, React, and TypeScript and DevOps skills.
- Specialized in engineering high-performance solutions in domains such as E-commerce, Fintech, and Entertainment. Skilled in RESTful and GraphQL APIs, relational databases,
- Postgres, MySQL/MariaDB. AWS Certified Developer Associate, holds Master's Degree in Software Engineering
- Strong command of Node.js, TypeScript, NestJS, PostgreSQL, and scalable system architecture. Over the years, he has demonstrated exceptional ownership, engineering judgment, and the ability to solve complex backend challenges independently.
- Hands-on experience building distributed, reliable, and high-performance systems on AWS, including serverless components, data pipelines, CI/CD automation, and infrastructure-as-code using CDK and Terraform. His strong debugging abilities and deep understanding of relational data modeling make him particularly effective in performance-critical environments.
- Direct experience working with AI-native platforms. On the Visiblie.ai project, he integrated ChatGPT, Perplexity, and Google AI Overviews into backend workflows, implemented real-time analytics, and ensured system scalability and observability - experience that closely aligns with your platform’s needs.
- AWS Developer Certification further confirms his level of technical maturity.
TypeScript
JavaScript
React
Node.js
PostgreSQL
Full-stack developer with solid experience in React.js, Angular, and Node.js, building high-performance and secure applications across fintech, travel, and real estate domains. Experienced with DBs (Postgres, Mysql), backend services written in Go, integrating AI/LLM platforms via API and integrating Conversational AI tools like Voiceflow. Comfortable working in mixed environments, with end clients, elaborating engineering decisions and shaping solutions to match business needs.
Angular 4yr.
TypeScript 4yr.
React 1yr.
Next.js 1yr.
Angular Material UI
Software engineer with a strong focus on frontend development utilizing modern frameworks such as Angular, React, and Next.js with proficiency in TypeScript. Demonstrates expertise in creating scalable and maintainable web applications with a history of improving codebases adhering to SOLID principles and optimizing for performance to achieve high Lighthouse scores. Established a record in implementing white-label solutions, UI component libraries, CI/CD pipelines with Docker, and comprehensive test coverage with Cypress. Brings experience in technical leadership, including guiding teams and enhancing product accessibility standards. Holds an education in Information Systems and Technologies, communicating fluently in English and Serbian as part of an international collaborative environment.
HTML5 4yr.
CSS3 4yr.
React 4yr.
Redux-Saga 4yr.
Software Engineer with a Master's degree in Food Technology and Engineering and extensive full-stack development experience. Expertise spans internal platform construction, workflow automation, data processing optimization, with strong proficiencies in HTML5, CSS3, React, Redux, Node.js, Express.js, and database management systems like MySQL and PostgreSQL. Proven track record in deploying through Azure and implementing CI/CD pipelines, alongside proficiency with cloud & AI tools, Chrome Extension development, and comprehensive understanding of SDLC and modern software engineering principles. Key achievements include database performance enhancements leading to near-instant response times, tripled productivity via automation, and the provision of mentorship with over 3000 code reviews, signifying a well-rounded technical proficiency and a commitment to development best practices.
Node.js 1yr.
TypeScript 1yr.
RESTful API 1yr.
PostgreSQL 1yr.
Optimism
Backend developer with 1 year of experience specializing in Node.js, TypeScript, and database management using PostgreSQL and MongoDB. Proven expertise in building REST APIs and executing performance optimization. Demonstrated flexibility by learning new technologies, Python (Django) and React, to deliver key projects. Proficient in Git, Redis caching, and Winston logging. Currently pursuing a bachelor's degree in Information Technology, with a solid foundation in software engineering principles and practices. Seeking a backend role to apply strong problem-solving skills and full-stack integration expertise.
Node.js 5yr.
NestJS 5yr.
Express
MongoDB
PostgreSQL
Full-stack JavaScript Engineer with a proven track record in building robust web applications end to end. Key expertise includes Node.js, React.js, and Vue.js, with proficiency in both frontend and backend. Adept at API design, MongoDB and PostgreSQL advanced knowledge and TDD practices. Proficient with AWS, containerization, and CI/CD.
TypeScript 5yr.
JavaScript 5yr.
SQL 5yr.
NestJS 5yr.
Express 5yr.
Versatile Full Stack Engineer/Lead with over 6 years of experience, specializing in creating robust web platforms and SaaS applications. Expertise in TypeScript, JavaScript, SQL, and a range of backend technologies including NestJS, Express, and TypeORM. Proficient in database management with Postgres, MySQL, MongoDB, and utilizing Redis and similar key-value stores, Familiar with AWS, GCP, and Azure. Skilled in CI/CD pipelines, Docker, caching, and queuing mechanisms, along with comprehensive testing abilities using Jest and Postman.A strong grasp of software architecture, particularly in microservices and event-driven systems, with a background in developing financial systems, IoT, and productivity tools.
React 5yr.
TypeScript 5yr.
Ext JS 4yr.
Redux 4yr.
Frontend Developer with expertise in building high-performance web applications specializing in React, Next.js, TypeScript, and state management libraries. Served key sectors including fintech, edtech, and e-commerce, with a knack for enhancing existing applications and crafting new feature-rich solutions. Skilled in integrating third-party services and APIs, performing migrations to modern frameworks, and optimizing for both performance and maintainability. Clearly demonstrated abilities in developing complex UI components and handling advanced frontend development tasks, backed by consistent application of coding best practices, a modern tech stack, and a commitment to quality via tools like ESLint and Prettier.
JavaScript
TypeScript
Node.js
React
Ext JS
Software engineer with 12 years of full-stack development experience, specializing in scalable application architecture using technologies such as Node.js, React.js, and TypeScript. Expertise in backend engineering, notably in the US-based FinTech sector, with a track record of delivering real-time transaction systems, financial workflows, and secure third-party integrations (Stripe, Plaid, MX). Proficient in creating AI voice agents with modern APIs and cloud services, coupled with frontend development skills to optimize UI performance. Holds a Master's degree in Computer Application, adept at employing Agile methodologies, and excels in building solutions across various domains including FinTech, Healthcare, and E-commerce.
Java
Go
Python
Node.js
React
Engineer with over 8 years of experience specializing in digital health and fintech platforms, with a robust track record in scaling microservices architecture and AI-driven solutions. Expertise in cloud-native infrastructure and full-stack development, leveraging technologies such as React.js, Java, Go, Python, and AWS. Significant achievements include enhancing PCI-DSS controls for payments processing, improving latency and system resiliency, leading large-scale global deployments, and ensuring compliance with various security standards. Holds a Bachelor's degree in Computer Science from Florida Institute of Technology and is adept at modern engineering practices and delivering business-oriented results in cross-functional settings.
PHP 6yr.
Python 5yr.
Django REST framework 5yr.
Node.js 4yr.
- Experienced software engineer with over 12 years in the IT industry, specializing in system architecture, full stack development, and cloud deployment, predominantly in AWS.
- Strong proficiencies in backend technologies including Python, PHP, Node.js, Java, and web frameworks such as Django, Laravel, and CakePHP.
- Demonstrated experience with both SQL and NoSQL databases, adhering to best practices in database management and data-driven application development.
- Proficient in orchestration tools like Kubernetes and Docker, enabling efficient CI/CD pipelines and application deployment.
- Recognized for academic excellence with a Master’s in Applied Software Development and awards such as 'Student of the Year'.
- Proven track record of leading and completing complex projects, reflected in an extensive project portfolio encompassing various domains and technologies.
C/C++/C#
JavaScript
Python
ASP.NET MVC
Blazor
Software engineering professional with over 14 years of experience in full-stack development. Versed in a range of technologies including C#, JavaScript, Python, .NET Core, and cloud services like Azure. Proven capability in leading teams and optimizing applications, achieving up to a 40% improvement in performance metrics. Holder of relevant certifications like Azure DevOps Engineer Expert and Azure Administrator Associate. Recognized for exceptional contributions with multiple awards, showcasing a commitment to innovation and excellence in software delivery within the IT industry.
Reverse Engineering
React Native
Android APIs
iOS
• 6+ years of experience in reverse engineering and security analysis of iOS and Android applications, including authentication, password reset, OTP, and account recovery flows;
• Experience with static and dynamic analysis using Frida, JADX, IDA/Ghidra, Hopper, Burp Suite, and mitmproxy, including hooking runtime behavior, traffic interception, and analysis of obfuscated code paths;
• Understanding of network protocols, API behavior, session handling, token flow inspection, and secure communication patterns in mobile systems;
• Skilled in bypassing anti-debugging protections, inspecting native components, and analyzing undocumented logic in React Native, Swift, Kotlin, and mixed-architecture apps;
• Experienced of mapping complex authentication workflows, documenting mobile security mechanisms, producing technical reports, diagrams, and vulnerability-focused flow descriptions;
• Experience optimizing backend/mobile integrated flows with PostgreSQL, caching, throttling, and performance tuning in high-load financial and administrative mobile apps;
• Skilled in mobile application security analysis across fintech, art commerce, and critical operations platforms, including real-time traffic inspection and security hardening;
• Effective communicator with experience collaborating with product, operator, and engineering teams through RFCs, status updates, and structured documentation.
React 2yr.
TypeScript 2yr.
JavaScript 2yr.
HTML5 2yr.
CSS3 2yr.
Software engineer with a solid foundation in front-end development, expertly handling React, TypeScript, and JavaScript (ES2015-2019). Proven experience in deploying robust web applications using Redux, Zustand, and state-of-the-art web technologies. Demonstrates a keen eye for UI/UX design implementing Figma creations into functional user interfaces, coupled with strong backend competencies in Node.js, PostgreSQL, and MySQL. Adept at utilizing development tools such as Git/GitHub, VS Code, and NPM for efficient project management and collaboration. Brings a strong work ethic and problem-solving skills to development teams, with a history of driving project success from conception to deployment.