Hire Vetted Web Application Engineers at Upstaff - Page 6

• 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.

• 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.

• 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.

• Senior Software Developer with 10+ years of experience in full stack development, AI/LLM integration, and cloud native architectures.
• Expertise in React, Next.js, Node.js, Python, TypeScript; architected GPT-4 document intelligence platforms processing 180K+ documents with 32% improved retrieval accuracy.
• Proficient in AI workflow orchestration using LangChain, vector databases, and prompt engineering, optimizing LLM costs by 38% while ensuring 99.8% service availability.
• Strong background in scalable microservices, secure REST APIs, and cloud services (AWS Lambda, ECS, Azure).
• Computer Science degree holder skilled in Agile, SDLC, design patterns, and performance optimization.

Senior Software Engineer with 10+ years of experience building scalable full stack applications using C#, ASP.NET Core, React, Angular, TypeScript, and SQL Server in enterprise, healthcare, and cloud environments. Skilled in integrating AI features (OpenAI API, Azure OpenAI, semantic search, automation), backend services, RESTful APIs, database optimization, secure authentication (JWT, OAuth2, RBAC), and cloud-native CI/CD deployments (Azure DevOps, GitHub Actions, Docker, Kubernetes). Holds a CS degree and excels in system design, performance tuning, agile practices, code reviews, and mentoring cross-functional teams.

• 8+ years designing scalable, high-performance distributed systems using React, Next.js, Node.js, Python, and microservices architectures.
• Expertise in domain-driven design, GraphQL federation, event-driven systems, and cloud-native deployments on Azure and AWS.
• Proven leadership in frontend architecture, including micro-frontends, state orchestration, CI/CD pipelines, and observability with Sentry and Datadog.
• Strong background in secure API gateway design, OAuth2/OIDC, RBAC, and zero-trust inter-service communication.
• Bachelor of Computer Science with extensive experience in containerization (Docker, Kubernetes), infrastructure-as-code, and advanced performance optimization.

• Full-Stack Software Engineer with 3+ years leading end-to-end development of scalable web applications using React.js, Next.js, Node.js, and modern JavaScript (ES6+).
• Proficient in REST API design, database management (MongoDB, MySQL, PostgreSQL, Oracle), and deployment on cloud platforms like Vercel and Linux servers.
• Expertise in system design, responsive UI/UX implementation, performance optimization, and version control with Git/GitHub.
• Founder and Project Lead at a tech initiative delivering client-focused solutions, including optimized photography and portfolio websites with domain and DNS configuration.

• Proficient in Python (Django, Pandas, NumPy) and web technologies (HTML, CSS, JavaScript) with hands-on experience in full-stack development and data analysis.
• Strong background in Computer Science with ongoing postgraduate studies and practical experience in software development methodologies and SDLC.
• Expertise in data processing and automation using Excel Power Query, n8n workflows, and API integrations, improving data accuracy by 20% and reducing reporting time by 30%.
• Skilled in database management with SQL, MongoDB, and ERP systems, supporting optimized business decisions through actionable insights.

• Backend Developer with 2+ years of experience specializing in PHP and Laravel for scalable web applications and backend services.
• Proficient in designing and integrating RESTful APIs, asynchronous processing with AWS SQS, and managing large datasets using MongoDB, DynamoDB, and MySQL.
• Skilled in cloud-based infrastructure and workflows leveraging AWS services to enhance platform stability and performance.
• Experienced in Agile and Scrum methodologies, supporting production deployments, release validation, and continuous system improvements.
• Holds a Bachelor’s Degree in Computer Systems Engineering, combining strong engineering fundamentals with practical software development expertise.

I reduced API response time by 75 percent from 1.2 seconds to 0.3 seconds using FastAPI and Redis caching. I built a payment system handling over 2 million monthly requests with zero downtime for twelve consecutive months. I migrated a fifteen-year-old MFC legacy system to modern C Sharp and .NET, cutting maintenance costs by 60 percent and tripling data processing speed. I also developed cross-platform desktop applications using Qt framework that reached over 10,000 downloads across Windows, macOS, and Linux.

I reduced API response time by 75 percent from 1.2 seconds to 0.3 seconds using FastAPI and Redis caching. I built a payment system handling over 2 million monthly requests with zero downtime for twelve consecutive months. I migrated a fifteen-year-old MFC legacy system to modern C Sharp and .NET, cutting maintenance costs by 60 percent and tripling data processing speed. I also developed cross-platform desktop applications using Qt framework that reached over 10,000 downloads across Windows, macOS, and Linux.

• 6+ years of experience delivering scalable web and cross-platform mobile applications using Vue.js, React, TypeScript, Node.js, and Spring Boot across EU and US markets.
• Proven expertise in modern front-end frameworks (Vue, Nuxt, React) and back-end microservices architecture, with strong skills in event-driven systems and RESTful API design.
• Led migration projects improving platform performance by 30-40%, including decoupling legacy systems and transitioning from Vue to React for SaaS platforms.
• Hands-on experience with testing frameworks (Jest, Vitest, Playwright), CI/CD pipelines on Azure and AWS, and component-driven development using Storybook.

• Senior Frontend Engineer with 9+ years of expertise in React, TypeScript, Next.js, and scalable frontend architectures including Feature-Sliced Design and SSR/SSG/ISR.
• Fintech, CRM, AI dashboards, optimizing performance and improving key business metrics.
• Strong skills in state management (Zustand, Redux, RTK Query), design systems (Material UI, AntD, shadcn/ui), and modern tooling (Vite, Webpack, Docker, CI/CD).
• Experienced in complex domain-driven UI systems, dynamic forms with typed validation, and multi-channel notification workflows, delivering maintainable and scalable solutions.
• Adept in Agile/Scrum methodologies, cross-functional collaboration, and mentoring within distributed teams.

• Senior full-stack engineer with 6+ years of experience delivering scalable B2B platforms using React, Node.js, and SQL (PostgreSQL/MySQL).
• Expertise in designing and optimizing REST and GraphQL APIs with OAuth 2.0 authentication, improving backend response times by up to 40%.
• Proficient in deploying micro-applications on Google Cloud Platform (Cloud Run, Cloud SQL) ensuring 99.9% uptime and automated scaling.
• Strong background in computer science with Master’s and Bachelor’s degrees from University of Belgrade.
• Skilled in CI/CD automation, webhook integrations, and resolving critical production issues, reducing release cycles by 30% and support tickets by 25%.

• Expertise in designing upgradeable smart contracts using the diamond pattern and UUPS proxies, managing 180k+ NFTs, and securing $2M+ in tokens with gas-optimized staking and vesting contracts.
• Proficient in Go, TypeScript, and Solidity, developing backend services, TypeScript SDKs, and cross-chain token bridges (Polygon, Ethereum, Base, Solana).
• Skilled in integrating Uniswap V3 oracles, building metatransaction flows, and automating multisig treasury operations with Node CLI tooling.
• Strong background in blockchain security, performing audits, vulnerability analysis with MythX and Slither, and implementing best practices before mainnet releases.

• AI Automation Engineer and Full Stack Developer with 5+ years delivering 50+ AI-powered SaaS platforms and automation pipelines for international clients.
• Expertise in Python, JavaScript (React.js, Vue.js, Next.js, Node.js), FastAPI, and cloud deployment on AWS, Azure, DigitalOcean with CI/CD and Infrastructure as Code.
• Proficient in integrating OpenAI API, LangChain, LangGraph for multi-agent intelligent workflows and building scalable RESTful APIs and microservices.
• Skilled in automation tools n8n, Zapier, and developing AI voice/caller agents, WhatsApp and Telegram bots to optimize business operations and reduce manual effort by up to 80%.

• Software Engineer with 4+ years of experience specializing in backend systems, distributed platforms, and blockchain products using Go, TypeScript, Node.js, AWS, and Solidity.
• Proven expertise in building event-driven architectures, serverless workflows, and production smart contracts with a focus on clean architecture and high throughput, including migrating services to Go .
• Hands-on experience developing DeFi platforms, integrating Uniswap SDK, and managing secure multi-wallet infrastructures for scalable blockchain applications.
• Strong foundation in Computer Science with a BSc degree and MSc in Information Technology, complemented by specialized bootcamps in Solidity and Solana development.

• Software engineer with 5+ years specializing in full-stack Web3 applications, DeFi protocols, and scalable cloud infrastructure.
• Expertise in React, Node.js, TypeScript, Ethers.js, and AWS, demonstrated by architecting NFT marketplaces supporting ERC-721/1155 standards and integrating complex DeFi functionalities.
• Proficient in CI/CD pipeline development using AWS CodePipeline.
• Strong background in computer science with a Bachelor of Computer Application degree and hands-on experience in testing frameworks like Jest and React Testing Library to ensure code reliability.
• Skilled in Atomic Design architecture, RESTful API development, and cloud deployment, and user-centric blockchain applications.

• Senior Java Developer with 9+ years of expertise in Java (up to v21), specializing in scalable, modular backend architectures for cybersecurity, banking, and automotive sectors.
• Certified Adobe Experience Manager Sites Developer with advanced skills in AEM as a Cloud Service, Spring Boot, RESTful APIs, OAuth 2.0, and automated data migration using Groovy.
• Proven ability to design secure OAuth 2.0 authentication services, integrate enterprise CRM systems, and implement observability with Elasticsearch and Kibana.
• Experienced in Agile Scrum environments, CI/CD pipelines (Jenkins, Adobe Cloud Manager), and code quality assurance using SonarQube and JUnit testing frameworks.

• Backend and Platform Engineer with 7+ years of experience in fintech, cloud platforms, and event ticketing, specializing in scalable payment systems and compliance workflows (KYC/KYB/KYT).
• Proficient in Go, Python, JavaScript, Kafka, RabbitMQ, and AWS services, with expertise in CI/CD automation, containerization (Docker, Kubernetes), and Linux infrastructure.
• Led critical migrations including Linux VM to Kubernetes, and Jenkins to GitLab CI, achieving zero downtime and improved deployment efficiency.
• Developed multi-tenant SaaS products reducing client go-live time from 1 year to 2 months, and implemented idempotent payment processing to prevent double spending.

Developed and deployed blockchain and web3 applications involving smart contracts, wallet integrations, token management, and decentralized features. Built scalable frontend and backend systems using React.js, Node.js, and MongoDB. Worked on optimizing application performance, improving user experience, and integrating blockchain functionality securely with modern web technologies.