Hire Vetted Web Application Engineers at Upstaff - Page 4

• Over 6 years of experience in software engineering with a strong focus on Ruby and Ruby on Rails, delivering backend solutions in finance, e-government, and construction domains.
• Expertise in building and optimizing GraphQL APIs, asynchronous processing with RabbitMQ, and integrating AWS S3 for file management.
• Proficient in test-driven development using RSpec, improving code quality, reducing technical debt, and maintaining microservices architectures.
• Skilled in PostgreSQL, Redis, RESTful services, and infrastructure collaboration, ensuring high reliability and performance in production environments.

Full-stack Software Engineer with 12+ years of experience building scalable web applications using PHP, Symfony, Laravel, Vue.js, React, and API Platform. Experienced with PostgreSQL, MySQL, MongoDB, Google Cloud Platform, and Stripe integrations. Skilled in automated testing (PHPUnit, Jest, Cypress), CI/CD, Docker, Kubernetes, and Agile development. Built AI-powered solutions using OpenAI GPT-4o and Microsoft Copilot Studio. Strong expertise in API-first architecture, GraphQL, OpenAPI, and secure authentication with Laravel Passport and Auth0.

• Over 10 years of expertise in Ruby and Ruby on Rails, specializing in scalable web applications, PostgreSQL optimization, and REST/GraphQL API development.
• Proven track record in designing modular microservices architectures and implementing automated KYC systems, enhancing verification success and reducing manual workload.
• Extensive experience with Angular (5+ years) and React for full-stack development, delivering high-traffic social networks and CRM platforms.
• Skilled in performance tuning, reducing API latency by ~30%, and integrating advanced features like face recognition to streamline moderation.

• Frontend developer with 7+ years of experience specializing in BigCommerce and e-commerce platforms, proficient in custom app development and Stencil theme customization.
• Expertise in JavaScript, ReactJS, and reusable Web Component widgets, enhancing interactive and scalable frontends.
• Skilled in API integration, responsive design, and Agile Scrum methodologies, ensuring seamless collaboration and efficient development cycles.
• Proficient with Git, BigCommerce Stencil, Shopify Liquid templating, and WooCommerce theme customization, delivering tailored e-commerce solutions.

I'm a Senior Software Developer with 13+ years of experience building scalable web applications for international remote teams. My primary stack includes React, Node.js, Python, PostgreSQL, and cloud platforms such as Google Cloud and AWS. Recently, I've been developing AI-powered web applications and automation workflows while collaborating with distributed teams across the US, Singapore, and Europe. I enjoy creating clean, maintainable solutions, continuously learning new technologies, and contributing to products that deliver real business value.

Led backend teams and delivery for critical Java services; designed and evolved scalable APIs and microservices; improved production reliability through observability, testing and CI/CD; mentored developers; delivered integrations and payment-related systems; built and operated modern serverless product infrastructure using TypeScript, PostgreSQL and cloud services.

• 14+ years architecting and deploying scalable AI chatbots and multi-tenant web platforms, automating 80%+ client support inquiries and supporting 10M+ monthly users.
• Expertise in Python, PHP, JavaScript/TypeScript, with advanced use of frameworks like Django, FastAPI, Laravel, React.js, and React Native for full-stack development.
• Proficient in AI tools including Rasa, Dialogflow, LangChain, OpenAI APIs, and vector databases, delivering HIPAA-compliant healthcare and fintech solutions.

• Software engineer with 7+ years of experience specializing in MERN stack, PHP, and modern JavaScript frameworks including React.js, Node.js, and Nest.js.
• Proficient in TypeScript, Laravel, CodeIgniter, MongoDB, and MySQL, delivering scalable web applications following best SDLC practices.
• Strong foundation in computer science with a B.Tech degree, applying engineering principles to develop robust backend and frontend solutions.
• Experienced in agile methodologies and software design patterns, contributing to projects at RipenApps
• Demonstrated ability to integrate complex systems and optimize performance in diverse domains, ensuring maintainability and code quality.

• Senior Full-Stack Engineer with 10+ years designing and deploying scalable SaaS platforms and agentic AI systems using Python, TypeScript, Node.js, and React.
• Expertise in building multi-step autonomous workflows, tool-calling agents, RAG pipelines, and LLM evaluation harnesses leveraging LangChain, OpenAI, Claude APIs, and vector search technologies.
• Holds a Bachelor of Computer Science degree, with extensive experience in software development lifecycle, prompt engineering, agent orchestration, and advanced AI-driven enterprise solutions.

Designed and delivered scalable web and mobile applications using React, Next.js, Node.js, Flutter, and Supabase. Built secure APIs, AI-powered solutions, authentication systems, payment integrations, and responsive user interfaces. Improved application performance, optimized databases, automated workflows, and successfully delivered multiple full-stack projects while collaborating with cross-functional teams to create reliable, user-focused software that met business goals and enhanced customer experiences.

• Backend developer with 4+ years of experience specializing in Golang, SQL, Docker, and cloud-native solutions on AWS and GCP.
• Proven expertise in designing and implementing scalable backend services, SDKs, and cross-cloud integrations with database-level synchronization (pglogical).
• Strong background in blockchain technologies, microservices, and smart contract development using Solidity, Rust, and Typescript.
• Skilled in observability tools (Prometheus, Grafana), authentication mechanisms (JWT, 2FA).
• Holds Bachelor's and Master's degrees in Cybersecurity, combining solid computer science education with practical software development and DevOps practices.

Designed and implemented AI solutions including custom AI agents, Retrieval-Augmented Generation (RAG) applications, and OpenAI integrations. Delivered automation workflows that reduced manual effort, improved customer engagement, and streamlined business operations through scalable, production-ready AI systems.

• Full-stack developer with 5+ years of experience delivering scalable web applications using Vue.js, React, Next.js, Node.js, and Express.js, Nest.js.
• Proficient in TypeScript, Vue 3 Composition API, RESTful API design, and backend microservices architecture.
• Skilled in modern frontend frameworks, Material Design libraries, and responsive UI development with strong emphasis on reusable components and performance optimization.
• Experienced in integrating AI-assisted coding tools (Claude Code, Cursor) to enhance development efficiency and code quality.
• Solid expertise in software development lifecycle, Git, CI/CD, and cloud platforms (AWS, GCP, DigitalOcean).

Main Achievements:

• Built scalable full-stack web applications using modern frameworks and DevOps practices for seamless deployment.
• Developed cross-platform mobile apps with React Native, delivering high-performance user experiences.
• Automated CI/CD pipelines to improve deployment efficiency and reduce manual errors.
• Created responsive front-end solutions that enhance user engagement and site performance.
• Earned certifications in React and DevOps to stay updated with industry best practices.

Designed and optimized modern websites and sales landing pages that improve user experience, mobile responsiveness, and business conversions. Delivered responsive front-end solutions, enhanced website performance, and implemented SEO best practices to help businesses strengthen their online presence. Experienced in web development, website optimization, and creating scalable websites that meet both client and user needs.

I am a senior software architect and blockchain automation engineer , with over 20 years of professional development experience and 4+ years dedicated to crypto, trading bots, WebSocket systems, and SaaS automation platforms.

My career spans enterprise systems, mobile applications, cloud analytics, authentication infrastructure, and large-scale data platforms — evolving into high-performance blockchain automation and bot engineering across Solana and Ethereum ecosystems.

I specialize in building:

• Real-time token tracking systems
• Telegram trading bots
• Solana Token Bundling, Deployment and tracking platforms,
• Rug detection & dev-sell intelligence
• MongoDB-driven analytics platforms
• Event-driven SaaS backends

All systems are designed for 24/7 uptime, restart persistence, and real trader usage — not prototypes.

Core Expertise

Blockchain & Crypto

• Solana Web3.js
• Ethereum (EVM)
• Pump.fun SDK
• Token metadata indexing
• Market cap & liquidity tracking
• Dev-sell detection
• Rugpull analysis
• ATH / ROI analytics
• Wallet behavior monitoring

Bot & Automation Systems

• Trading bots
• Token sniper trackers
• Telegram bots
• Volume simulation bots
• Alert engines
• Subscription lifecycle managers

Real-time ranking systems

• Backend & Protocol Engineering: 7+ years building large-scale, high-performance consensus-layer systems in Go and C++.
• Scalable Data Architecture: Architected high-load EVM indexers, delivering sub-second analytics over 100M+ rows with real-time streaming via REST, gRPC, and SSE.
• Cryptography: Developed ZK circuits (gnark) and secure distributed signing nodes (MPC) using advanced primitives like BLS and ECDSA.
• Network Optimization: Optimized consensus protocols (CasperFFG, LMD-GHOST) and libp2p networking, scaling production networks with up to $2B in market cap.
• Systems Foundation: B.Sc. in Informatics & Applied Mathematics with deep expertise in LLVM and compiler-level optimization.

• Proficient in TypeScript, JavaScript, Python, SQL (PostgreSQL/Plpg SQL), with extensive backend and full-stack development experience using Supabase, PostgreSQL, and REST APIs.
• Developed and maintained complex systems including travel pricing platforms, contract management, and crypto investment dashboards, demonstrating strong database schema design and server-side logic implementation.
• Expertise in bot development with Twilio and WhatsApp Business API, and Python Telegram bots featuring automated scheduling and persistence.
• Skilled in frontend frameworks Vue.js, React, Next.js, and responsive UI design, with deployment experience on Vercel
• Applied SEO optimization

• 6+ years in enterprise web application development with expertise in Python (FastAPI), Angular, and React.js.
• Proficient in designing and optimizing REST APIs, implementing OAuth 2.0, JWT, SSO, and enhancing Core Web Vitals for performance.
• Hands-on experience with AWS EC2, SSR, Pub/Sub, and integrating backend services with frontend React applications.
• Strong background in Computer Science (B.Tech) and Agile methodologies, contributing to scalable and maintainable software solutions.
• Demonstrated ability in backend FastAPI development and production support for client projects, ensuring robust authentication and API performance.

• Software engineer with 4+ years in cross-platform mobile and front-end development, specializing in React, React Native, and Flutter.
• Proficient in state management (Redux Toolkit, BLoC, Redux Saga), API integration, CI/CD pipelines, and performance optimization.
• Experienced in Agile methodologies, leading teams, mentoring developers, and delivering scalable applications for Android and iOS.
• Developed complex apps featuring real-time communication (Socket.IO), multi-authentication, payment integration (Stripe), and cloud services (Firebase, AWS Amplify).
• Strong background in computer science engineering , applying clean architecture and modular design patterns in production projects.

• Senior Software Developer & Team Lead with 10+ years in backend architecture, REST API design, and cloud infrastructure using Node.js, Python, Laravel, and AWS services including hands-on experience in database design (MySQL, PostgreSQL, MongoDB) and modern software development practices.
• Expertise in AI-powered applications, specializing in RAG systems with LangChain, OpenAI APIs, Ollama, Pinecone, and Qdrant vector databases.
• Proven track record leading scalable web and mobile app projects, including AI-driven recommendation engines and intelligent notification systems.
• Strong command of microservices, serverless architectures, and deployment automation on AWS (EC2, ECS, Lambda, API Gateway).

• Engineer with 5+ years in frontend development, specializing in AI-powered web applications, LLM integrations, and MCP-based workflows.
• Expertise in TypeScript, React, and backend technologies including Node.js, NestJS, REST, and GraphQL APIs.
• Designed and led frontend architecture for complex financial platforms, implementing real-time analytics, multi-provider authentication, and third-party integrations.
• Proficient in AI tooling such as Claude Agent SDK, OpenAI API, and prompt engineering, delivering AI-enhanced automation and intelligent features.

Experienced in Agile methodologies, scalable component systems, performance optimization, and cross-functional collaboration in fintech, Web3 ect.

• Over 5 years of experience in front-end and full-stack development with deep expertise in Angular (2-21), NgRx, RxJS, and state management for scalable web applications.
• Proficient in modern JavaScript/TypeScript frameworks (React, Redux, Node.js, Nest.js), hands-on experience building complex applications integrating blockchain (Terra.js) and 3D visualizations (Three.js).
• Skilled in RESTful and GraphQL API design, MongoDB, PostgreSQL, and CI/CD pipelines using Jenkins and Bitbucket.
• Delivered high-impact projects such as insurance web tools, crypto exchange platforms, and real-time chat apps, demonstrating strong architectural design, custom authentication, and performance optimization.

• Senior Web Designer with 15+ years in front-end development, specializing in HTML5, Bootstrap 4&5, CSS/SCSS, Angular Material Design, React.js, WordPress, and Shopify development.
• Proven expertise in full HTML development lifecycle for dynamic web projects, integrating responsive design and UI/UX best practices.
• Skilled in design tools including Photoshop, Adobe XD, Figma, and Adobe Illustrator, enhancing creative and technical project delivery.
• Strong background in project management and client relations, delivering high-impact web solutions for diverse industries.
• Experience with version control (GitHub) and modern web frameworks, ensuring maintainable and scalable codebases.

• Frontend Software Engineer with 3+ years of experience specializing in React.js, Next.js, and modern JavaScript (ES6+), delivering scalable, high-performance web applications.
• Proven expertise in AI integration, including LLM API (Google Gemini, OpenAI) and chatbot development, demonstrated through leading AI-driven SaaS platforms like Cheaper.com.
• Strong background in full SDLC, API orchestration (REST, GraphQL), and performance optimization, achieving up to 35% load speed improvements and 90+ Lighthouse scores.
• Computer Science degree holder with hands-on experience in backend technologies (Node.js, Django REST), database management (PostgreSQL, MySQL), and CI/CD pipelines (GitHub Actions).

• Full Stack Developer with 4+ years of experience architecting scalable web applications using React.js, Next.js, Node.js, and Python frameworks (FastAPI, Django), specializing in AI integration and cloud-native solutions.
• Proficient in designing and optimizing RESTful and GraphQL APIs, microservices, and serverless architectures with expertise in PostgreSQL, MongoDB, Redis, and vector databases (Pinecone, Weaviate).
• Skilled in DevOps practices including CI/CD pipelines, Docker, Kubernetes, AWS services, and automated testing (Jest, Cypress, Playwright) to ensure robust, secure deployments.

Proficient in backend and full-stack development using Python, Go, Java, TypeScript, and PostgreSQL, with hands-on experience building high-throughput API gateways and event-driven microservices.

• 24 years of expertise in full-stack development and enterprise architecture, specializing in Java, SpringBoot, Angular, and microservices.
• Architected high-performance systems including SOLR-based enterprise search
• Proficient in blockchain development with Rust/TypeScript for Solana, building high-frequency trading bots and automation tools.
• Skilled in containerization, Kubernetes orchestration, and CI/CD pipelines with Jenkins and Docker to enhance deployment reliability.
• Experienced in designing scalable cloud-native architectures integrating OAuth2, Keycloak, and advanced middleware for secure authentication and seamless system integration.

• Frontend Developer with 1+ year of experience building SaaS platforms and dashboards using React, Next.js, TypeScript, and Tailwind CSS.
• Skilled in designing PostgreSQL schemas and REST APIs with FastAPI and Prisma ORM, enabling full-stack feature delivery.
• Implemented advanced state management using React Query, Zustand, and Redux Toolkit to optimize data flow and UI responsiveness.
• Developed secure authentication systems with NextAuth.js, including OAuth, email verification, and protected routes.
• Experienced in microservices architecture, real-time data pipelines, and cloud storage integration, demonstrated in projects using Kafka, Docker, and Google Cloud Storage.

• Experienced MERN Stack Developer with 7+ years in designing and implementing scalable RESTful APIs, secure authentication systems (JWT, OAuth), and real-time features using Socket.io.
• Proficient in MongoDB schema optimization, query tuning, and building multi-vendor SaaS platforms, LMS, and AI-integrated applications.
• Skilled in full SDLC, agile methodologies, CI/CD pipelines, Docker, and cloud deployments (AWS EC2, S3, Lambda) ensuring high availability and performance.
• Strong expertise in frontend technologies including React.js, Redux, Context API, and responsive design frameworks like Tailwind and Bootstrap.
• Demonstrated ability to integrate third-party payment gateways and external APIs.

• Senior Full Stack Engineer with 12+ years of experience, including 8+ years with Node.js, TypeScript, and Vue.js (Tailwind CSS)
• Specialized in microservices (NestJS), event-driven systems (Kafka, RabbitMQ), and configurable enterprise SaaS platforms
• Ensured production reliability with on-call support for high-load systems
• Skilled AWS (Lambda, VPC), Terraform, Docker, CI/CD expertise
• Experience in enterprise (healthcare) and startups (Y Combinator-level, Sixa)
• Focused on AI-driven SaaS, open to long-term collaboration; builds trading bots