Hire Vetted Web Application Engineers at Upstaff - Page 4

• Full-Stack Engineer with 3+ years of experience in scalable SaaS and AI-driven platforms, specializing in React, Next.js, Node.js, GraphQL, and asynchronous event-driven systems.
• Proficient in integrating OpenAI APIs, RAG pipelines, vector databases, and secure authentication (Auth0, OAuth) for enterprise-grade, multi-tenant architectures.
• Cross-platform apps serving 1,500+ users with optimized APIs, message queues, and AWS cloud infrastructure.
• Skilled in modular component design, performance optimization, CI/CD pipelines, and cloud using AWS, Docker, and Supabase.
• Bachelor’s in Computer Science with achievements including ICPC Asia ranking and leadership roles in developer communities.

• Over 9 years of experience in software development with a focus on Java 8/17 back-end applications, utilizing Spring Boot and HAPI FHIR frameworks.
• Proficient in designing and developing APIs, business logic, and database solutions using PostgreSQL, Kafka, Docker, and Liquibase in healthcare and finance sectors.
• Strong expertise in object-oriented design, design patterns, and software development lifecycle within Agile methodologies including Scrum and Kanban.
• Hands-on experience with HL7/FHIR protocols and standards, contributing to protocol converter projects for healthcare applications.

• Senior React Native engineer with 7+ years building mobile apps with React Native (Expo, CLI) and React, focusing on scalable app architecture and feature delivery.
• Experience with video features in social and communication apps (live streams, video calls, feed-based consumption), including HLS playback, buffering, and performance tuning on mobile.
• Worked on mobile-first video UX: smooth playback, fast loading, adaptive bitrate, and seamless navigation between video items.
• Hands-on with monetization, analytics, and integrations (Firebase, GraphQL), plus mentoring and collaboration across product and backend teams.

• Backend Engineer with 4+ years of experience in Java, TypeScript, and Python, working with Spring Boot and NestJS in microservices architectures.
• Experience in healthcare integrations: worked with Epic/MyChart, HL7 (R4) data processing and conversion into internal services.
• Built and maintained backend services handling high-load systems using Kafka, Redis, Cassandra, and PostgreSQL.
• Developed integration services for third-party systems, including batch processing and REST-based communication in AWS environments.

• Engineering background from IIT Patna with a strong CGPA of 8.97 in Computer Science and Engineering.
• Hands-on experience in modernizing high-stakes trading platforms using React functional components and Material UI, enhancing performance and scalability.
• Proficient in C++, Python, JavaScript, Node.js, and web technologies with expertise in algorithmic trading strategies and risk management, achieving 2500% returns in simulated markets.
• Demonstrated competitive programming excellence with top global ranks in ICPC and Hacker Cup, and advanced problem formulation for AI code generation.

• Senior Java Engineer with 10+ years of experience specializing in Java, Spring Boot, Hibernate, and microservices architecture.
• Proficient in full-stack development using Angular, React, TypeScript, and RxJS, with strong expertise in PostgreSQL, Redis, and cloud platforms (GCP, AWS, Azure).
• Hands-on experience delivering scalable solutions in real estate compliance, ticket management, and corporate social networking domains.
• Skilled in CI/CD pipelines, containerization (Docker, Kubernetes), automated testing (JUnit, TestNG, Mockito), and code quality tools (SonarQube).
• Holds a Bachelor’s degree in Informatics and certifications in Java and Google Cloud.

Led full-stack development of 20+ production applications combining React frontends with AI-powered Python backends. Integrated LLM APIs (Groq, Gemini, Anthropic) into customer projects, building RAG systems and fine-tuned models on local GPUs. Mentored 5+ junior developers. Recently built production React+Flask chatbot with Groq API, deployed on Vercel. Portfolio: https://pro-two-chi.vercel.app/

Backend-focused Full Stack Developer with 1+ year of experience in Node.js, Express.js, TypeScript, and Sequelize ORM. Skilled in building scalable REST APIs, JWT authentication with RBAC, and database optimization using MongoDB and MySQL. Experienced in React.js, Next.js, and Tailwind CSS for frontend development. Proficient in Firebase Cloud Messaging, ExcelJS, Puppeteer, AWS EC2, and Cloudinary. Strong understanding of asynchronous programming, middleware architecture, OOP, and API integration. B.Tech graduate in Information Technology with a passion for developing secure, scalable, and high-performance applications.

• Senior Software Engineer with 5+ years in frontend and full stack development, specializing in Next.js, Angular, and scalable architectures for Web3 and AI-driven platforms.
• Proven expertise in blockchain integrations, real-time systems, and API design, delivering features like automated on-chain actions and wallet-based authentication.
• Strong backend skills with FastAPI, Python, PHP, and database optimization (PostgreSQL, SQLite), improving performance and reducing errors by up to 25%.
• Experienced in mobile app development using Ionic and Cordova, enhancing user engagement and offline functionality for global clients.

• Software Engineer with 1+ years of experience in developing scalable full-stack applications using .NET (C#), React.js, and SQL Server, focusing on responsive UI and efficient backend integration.
• Expertise in AI-driven automation, including LLM-powered applications, Retrieval-Augmented Generation (RAG), prompt engineering, and vector embedding pipelines using Python and AI frameworks like TensorFlow and PyTorch and Exploratory Data Analysis (EDA) to support AI/ML model development and deployment
• Proficient in designing and optimizing REST APIs, database query workflows, and integrating intelligent automation solutions within Agile cross-functional teams.

• 7+ years expertise in Go, specializing in distributed systems, microservices, and legacy system modernization with zero downtime.
• Contributor to open-source projects (KrakenD API Gateway), with published works on distributed teams and mesh networking, demonstrating commitment to software architecture excellence and continuous learning.

• Software engineer with over 7 years of experience specializing in full stack and front-end development.
• Proficient in AngularJS, Sockets, and web/mobile tool development, with a strong background in modern web technologies and frameworks.
• Experienced in Agile methodologies and collaborative team environments across international projects in Spain, the US, Dominican Republic, Argentina, and Venezuela.
• Holds a degree in Informatics from Universidad de Oriente, providing a solid foundation in computer science principles and software development lifecycle.
• Demonstrated ability to maintain and enhance commercial platforms, integrating user feedback and ensuring robust, scalable solutions.

• AI/ML Engineer and Python Developer with 6+ years of experience designing and deploying production-grade AI systems and scalable backend services using FastAPI, PostgreSQL, Redis, and Docker.
• Expertise in Generative AI, LLMs, RAG pipelines, multi-agent systems, and real-time Voice AI, demonstrated by leading complex projects integrating Whisper, ElevenLabs, LangChain, LangGraph, and pgvector.
• Proficient in asynchronous programming with Python asyncio, building custom real-time voice pipelines, and managing multi-phase conversational agents with compliance-critical logic.

• Built LLM and RAG features (prompt engineering, structured JSON outputs, multi-model fallback), including a RAG memory layer for continuous, personalized AI sessions.

• Shipped 8+ full-stack, user-facing features in a 4-month AI platform internship using FastAPI, Next.js, React, and TypeScript.

• Automated tasks and built web scrapers in Python (Selenium, BeautifulSoup, PyAutoGUI) in fintech environments.

• Strong in backend, REST APIs, and cloud (Azure, GCP, Firebase), with CI/CD and Agile.

• Master's in Computer Engineering & Big Data; game projects built in Unity and Unreal Engine 5.

• Software Engineer with 4+ years in secure, scalable enterprise systems using ASP.NET Core, React.js, Node.js, AWS, and Okta identity platforms.
• Expertise in architecting authentication flows, including MFA, SAML integrations, JWT validation, and session management.
• Proven experience in cloud-native solutions, serverless architectures, Terraform automation, and CI/CD pipelines.
• Skilled in troubleshooting production issues, performance optimization, and implementing GenAI-enabled automation tools.
• Bachelor's in Computer Science & Engineering with strong background in IAM, API architecture, and DevOps monitoring tools.

• Full Stack Engineer with 9+ years of expertise in MERN stack, TypeScript, Node.js, React.js, and cloud technologies including AWS (EC2, S3, RDS).
• Proven track record in designing scalable microservices architectures, implementing CI/CD pipelines, and enhancing application security using JWT and OAuth.
• Led development of enterprise-grade applications and dashboards integrating complex APIs and cloud services, notably for clients like Amazon Seller Center and Barclays.
• Skilled in Agile methodologies, automated testing frameworks (Jest, Cypress), and containerization with Docker to ensure high-quality code.
• with strong database expertise in MongoDB, SQL, MySQL, and PostgreSQL

• Full Stack Engineer with 12+ years of expertise in .NET (Core 3 to 8, Framework 4.8), C#, Angular (up to v13), React.js, and SQL Server, delivering enterprise-grade software solutions.
• Proficient in cloud platforms including Azure, AWS, Kubernetes, and DevOps practices with CI/CD pipelines using Jenkins and Git.
• PL/SQL, MongoDB, and ETL processes, demonstrated in projects like Liz Claiborne OLAP data warehouse and AgrinHealth healthcare platform.
• Experienced in integrating third-party APIs (PayPal, Stripe, trading platforms) and building scalable SaaS/PaaS solutions with microservices
• Holds a BSc in Computer Science, skilled in Agile, RUP, UML, and software development lifecycle management.

• Full Stack Engineer with 8+ years of experience specializing in .NET Core (3.0 to 8.0), C#, ASP.NET MVC, and front-end frameworks including Angular and React.js.
• Proven expertise in cloud platforms Azure and AWS, implementing services like Azure Functions, App Service, and AWS Lambda.
• Skilled in real-time communication technologies such as SignalR and Socket.io, enhancing user engagement in complex applications.
• Strong background in database management with SQL Server, MySQL, and MongoDB, optimizing performance and reliability across projects.
• Computer Engineering graduate with hands-on experience in CI/CD pipelines, Docker, DevOps practices, and modern software development methodologies.

• Full-stack developer with 7+ years of expertise in Python (FastAPI, Flask), Java, Node.js, and modern frontend frameworks (Next.js, React, TypeScript).
• Proven success in legacy system modernization, including architecting a custom AEM Managed Control Process tool to automate complex content migrations, enhancing data integrity and team velocity.
• Strong background in scalable backend systems, cloud-native deployments (AWS Lambda, Docker, Kubernetes), and geospatial data management with PostgreSQL/PostGIS.
• Experienced in Agile methodologies (Scrum, Kanban), full project ownership, client communication, and cross-cultural remote collaboration with US/Latam teams.
• Engineering education

• 13+ years of expertise in full-stack development and solution architecture, specializing in .NET Core, C#, ASP.NET MVC, and cloud platforms including Azure and AWS.
• Proven track record in modernizing legacy systems to modular, microservices-based architectures with secure, HIPAA-compliant cloud deployments.
• Strong background in database design and optimization using SQL Server and Oracle, with hands-on experience in performance tuning and OLAP data warehousing.
• Skilled in CI/CD pipeline imp, DevOps practices, and Agile methodologies to enhance software quality.
• Led projects integrating IoT, healthcare data, and enterprise reporting, showcasing software design and team leadership.

• Software Engineer with 4+ years of experience building scalable web and mobile applications using React.js, Node.js, Express.js, and MongoDB.
• Skilled in frontend development with React, Redux Toolkit, Tailwind CSS, and backend RESTful API development, state management, and performance optimization.
• Experienced in Agile workflows, CI/CD pipelines, and cross-functional collaboration to deliver high-quality software solutions.
• Developed complex platforms including AI-powered recruitment systems, procurement platforms, eCommerce applications, and business management solutions.
• Experienced in implementing secure integrations, responsive user interfaces, and scalable application architectures.

• Backend Engineer with strong expertise in Java (Spring Boot, Kafka), Python (FastAPI, Airflow), and Scala (Akka, Spark)
• Designs and delivers scalable microservices and cloud-native applications with Kubernetes, Docker, Terraform, and AWS (RDS, S3, Lambda)
• Experience building secure IAM platforms and implementing auth protocols (OAuth2, OIDC, SAML, FIDO2)
• Skilled in CI/CD (GitLab, Jenkins, Azure DevOps), automated testing, and infrastructure as code
• Works with distributed systems, focusing on reliability, performance, and maintainability

• Full Stack Engineer with 5+ years of experience in front-end and back-end development, specializing in React, Vue.js, Node.js (Express/NestJS), Python, GO, Rust, and Ruby.
• Proficient in modern DevOps practices including GitHub Actions, GitLab CI, Docker, Kubernetes, and cloud deployment on AWS, Vercel, and Netlify.
• Led technical teams and managed software projects, delivering AI-powered web applications like Eduflow and blockchain-based Secure-Watch.
• Strong background in software engineering education with DUT and Licence degrees, emphasizing clean, scalable code and thorough code reviews.
• Experienced in database management with PostgreSQL, and Prisma ORM, applying best practices in SDLC

• Electronics and Communication Engineering undergraduate with hands-on experience in IoT-based embedded systems and automation, demonstrated through a Smart Street Lighting project using Arduino IDE and ESP8266.
• Proficient in Java, C, Python, SQL, and Spring Framework, with practical application in developing RESTful APIs, microservices, and console-based applications.
• Experience integrating Apache Kafka with Spring Boot microservices for transaction processing, employing Spring Data JPA and REST API integration.
• Certified in software engineering simulations and data science, with a strong foundation in data structures, algorithms, and database management.

• Senior JS Full-Stack Engineer with 6+ years, delivering scalable fintech, Web3, and SaaS applications.
• Expertise in designing and optimizing REST APIs, microservices, and database schemas using PostgreSQL, MongoDB, and Redis, improving response times by up to 40%.
• Proven track record in cloud-native deployments on AWS with Docker and CI/CD pipelines, achieving 95%+ automated test coverage and low defect rates.
• Strong focus on clean architecture, performance optimization, and scalable system design demonstrated through complex projects like decentralized email platforms and real-time cryptocurrency analytics.
• Applying best practices in automated testing and collaborative code reviews.

• Over 5 years of specialized experience in Salesforce Commerce Cloud (SFCC) development, including SFRA and Composable architectures, delivering scalable e-commerce solutions for global brands like Swarovski and Halfords.
• Proficient in backend development with strong expertise in Salesforce B2C PWAkit, Django, and test automation, driving efficient and maintainable codebases.
• Hands-on experience leading complex migrations and optimizing system architectures to enhance digital commerce platforms.
• Solid foundation in computer science with a Master’s degree in progress and a Bachelor’s in Software Engineering, underpinning strong software development lifecycle (SDLC) knowledge and best practices.

• Over 10 years of software engineering experience, including 4+ years specializing in scalable, high-availability SaaS services with Ruby on Rails.
• Skilled in Ruby, Rails, RSpec, REST APIs, Sidekiq, PostgreSQL, Oracle, Docker, Kubernetes, and JavaScript.
• Strong focus on performance optimization, memory management, SQL query optimization, and reliable backend architecture.
• Experienced in financial automation, billing systems, BI platforms, microservices, and legacy system integrations. Comfortable with remote collaboration, TDD, refactoring complex codebases, and maintaining backward compatibility.

• Senior Full Stack Engineer with 5+ years in fintech, specializing in React, Ruby on Rails, Node.js, and PostgreSQL for scalable payment and financial platforms.
• Expertise in integrating banking systems, blockchain services, Binance APIs, and building secure authentication and real-time features.
• Proficient in frontend architecture using React, TypeScript, Redux, TailwindCSS, and backend RESTful APIs with Express.js and Sequelize.
• Experienced in developing DeFi infrastructure, Web3 interfaces, and implementing robust testing workflows to enhance platform stability.

• Blockchain Engineer with 3+ years of experience in DeFi, smart contracts, and Web3 full stack development using Solidity, Foundry, React, TypeScript, wagmi, and viem.
• Skilled in secure smart contract development, fuzz testing, invariant testing, mainnet fork testing, and static analysis with Slither and Aderyn.
• Built scalable DeFi governance, vault, treasury, NFT, and subscription-based blockchain systems, plus fintech payment infrastructures integrating Binance APIs and microservices.
• Experienced with ERC20, ERC721, and ERC4626 standards, decentralized voting systems, and full stack development using Node.js, Express, React, and REST APIs.

• Senior Full Stack Engineer with 5+ years of experience specializing in fintech platforms, payment integrations, and scalable web/mobile applications using React, Ruby on Rails, Node.js, and PostgreSQL.
• Proficient in frontend architecture with React, React Native, TypeScript, and backend API development including RESTful services and blockchain integrations.
• Experienced in building secure financial systems integrating banking APIs, Binance services, and decentralized finance (DeFi) infrastructure.
• Skilled in Agile methodologies, testing workflows, and collaborative remote development within international teams.

• 13+ years of expertise in full-stack development and solution architecture, specializing in .NET Core, C#, ASP.NET MVC, and cloud platforms including Azure and AWS.
• Proven track record in modernizing legacy systems to microservices and cloud-native architectures, ensuring HIPAA-compliant deployments and scalable multi-tenant solutions.
• Strong background in database design and optimization with SQL Server and Oracle, including performance tuning and complex data integration using HL7 and API gateways.
• Hands-on experience leading agile teams, implementing CI/CD pipelines with Azure DevOps and GitHub Actions, and enforcing security best practices across the SDLC.

• Full-stack developer with 4+ years of experience specializing in Ruby on Rails, React.
• Proficient in integrating complex APIs such as Binance, Circle, and various banking services, enhancing fintech applications like VitaWallet and Rocket Exchange.
• Skilled in modern development practices including unit/integration testing (RSpec, Chai, Mocha), CI/CD with GitLab/GitHub, and Agile methodologies.
• Strong background in computer science and mathematics, complemented by teaching roles in Python, JavaScript, and blockchain programming, demonstrating deep technical expertise and leadership.