Hire the Best TypeScript Developers

Hi there! I'm a Senior Frontend Engineer with 5 years of experience building fast, responsive, production-ready web apps with React, Next.js, TypeScript, Vue.js, and Nuxt.js. I freelance as a Top Rated developer on Upwork with a decent job success track record, and my work spans fintech, e-commerce, edtech, healthcare, real estate, and early-stage SaaS startups. I care about clean, maintainable code and long-term ownership, not just shipping a feature and moving on. If you're looking for a developer who can join a codebase, understand the architecture, and stay for the long haul, that's how I like to work. 𝐊𝐄𝐘 𝐄𝐗𝐏𝐄𝐑𝐓𝐈𝐒𝐄 ✅ HTML5, CSS3, JavaScript, TypeScript, Git ✅ React, Next.js, Vue.js, Nuxt.js ✅ Node.js, Express, NestJS, Vite ✅ Responsive, pixel-perfect UI with Tailwind CSS, shadcn/ui, Radix UI, MUI, Styled-Components ✅ State and data: Redux, Zustand, TanStack React Query, React Hook Form + Zod ✅ REST APIs, GraphQL, and third-party API integrations, plus real-time features with WebSockets ✅ Databases: PostgreSQL, MongoDB, Supabase, Redis ✅ Figma-to-code conversion with high fidelity, backed by real design system experience ✅ AI integration: OpenAI and Claude APIs, LLM-powered chatbots, RAG and vector search, AI-assisted dashboards ✅ AI-native workflow using Claude Code and Cursor to ship faster without sacrificing code quality ✅ Smooth interactions and animation with Framer Motion ✅ Testing with Jest, Playwright, and Cypress, with a TDD mindset ✅ Stripe integration, AWS, Vercel deployment, Docker, and CI/CD pipelines ✅ SEO-friendly, cross-browser, accessible builds that actually rank and perform 𝐖𝐄'𝐑𝐄 𝐀 𝐆𝐎𝐎𝐃 𝐅𝐈𝐓 𝐈𝐅 ➡️ You need Figma designs turned into a responsive, production-ready frontend ➡️ You want AI features (chatbots, smart search, recommendations, LLM workflows) built into your product, not bolted on ➡️ You're building a SaaS dashboard, fintech tool, or data-heavy interface and need someone who can own the frontend end to end ➡️ You want someone comfortable working independently in an existing codebase, not just greenfield builds ➡️ You value clear communication and steady updates over chasing you down for status 𝐖𝐇𝐘 𝐖𝐎𝐑𝐊 𝐖𝐈𝐓𝐇 𝐌𝐄 🥇 5 years hands-on, portfolio and shipped apps available below 🤖 AI-native workflow, ahead of the curve on modern tooling 🔃 Ongoing support after delivery, not a one-and-done handoff 🤝 Direct, honest communication throughout the project ⏰ On-time delivery without cutting corners on code quality Portfolio: nathanielessien.vercel.app Send me a message and let's talk about what you're building.

React Native & Expo developer (iOS & Android) with 5+ years shipping production mobile apps live right now on the App Store and Google Play. Top Rated, 100% Job Success, known for clean, tested, on-time delivery. I build React Native apps end to end from scratch or step into your existing codebase to add features, polish the UI, and fix bugs without breaking what already works. My specialty: taking founder-built or AI-built apps through the last 20% from "almost working" to approved, published, and stable on both stores. Mobile apps I've built and shipped: ▪ Mooner: services-on-demand marketplace with real-time postings, geolocation, and negotiable pricing. Live on App Store & Google Play. ▪ A'men: official UAE Media Council app connecting government and the public. Delivered in 10 days. Live on both stores. ▪ GeoFace: patented app that verifies physical presence via geolocation, timestamps, and image authentication. Live on the App Store. What I can do for you: ▪ React Native iOS & Android apps (Expo and bare workflow) EAS Build, TestFlight, OTA updates ▪ App Store & Google Play submission, signing, and release management ▪ Authentication (Apple/Google Sign-In, Supabase, OAuth/JWT) and subscriptions (RevenueCat) ▪ Payments (Stripe, PayPal) and third-party integrations ▪ Real-time features (Socket io), maps and geolocation (Google Maps) ▪ AI-powered features (OpenAI, Claude, Gemini, RAG, vector search) ▪ Full-stack backends for mobile apps (Node.js, NestJS, PostgreSQL, Supabase, Firebase) My stack Mobile: React Native, Expo · Frontend: React, Next.js, TypeScript, Tailwind CSS · Backend: Node.js, Express, NestJS · APIs: REST, GraphQL, tRPC · Database: PostgreSQL, MongoDB, Prisma · Cloud: AWS, Docker, Firebase Why clients keep working with me: I own the full lifecycle planning, coding, testing, deployment, and support and I verify every fix before I call it done. Daily written updates, replies within a few hours, honest timelines. Let's ship your app message me and I'll reply within a few hours.

🏆 Top 1% Stack Overflow | Open-Source Publisher | 8+ Years Senior Engineering I specialize in end-to-end AI and full-stack development, covering architecture, implementation, and deployment. I work with founders, SaaS teams, and product leaders to build AI-powered and full-stack applications designed to handle growth in users, data volume, and evolving requirements. My work includes AI chatbots, internal AI agents, data-driven dashboards, and full-scale web applications built with Laravel/PHP, Next.js React, SvelteKit, Vue, TypeScript, Node, FastAPI, Django, and AWS/GCP/Azure. ✅ Testimonial 👉 “After working with developers for the past 20 years, I can confidently say that Eryk is among the most talented developers I have ever worked with.” ⭐️⭐️⭐️⭐️⭐️ 👉 “Eryk is a highly capable engineer who delivers results quickly. We were searching for a full-time programmer for our start-up, and he stood out through his technical depth and speed of execution. We can confidently recommend him.” ⭐️⭐️⭐️⭐️⭐️ My approach to engineering is rooted in the critical thinking and risk management that define this discipline. I typically opt for FastAPI when low-latency AI endpoints are paramount, Django when admin-heavy workflows and integrity are crucial, and Next.js when SEO or app-like user experiences are necessary. The stack is focused on addressing specific problems rather than following trends. I work primarily in TypeScript, building clean, maintainable applications with Next.js, React, SvelteKit, and Vue, based on product needs and team structure. On the backend, I design REST and GraphQL APIs and backend services using Laravel, FastAPI, Django, and Node.js, and leverage platforms like Supabase and Firebase when speed, reliability, and simplicity are priorities. I’ve implemented authentication, real-time features, storage, and background workflows across both platforms in live production environments. From an infrastructure and deployment standpoint, my work includes AWS, GCP, Docker, CI/CD pipelines, serverless deployments, cloud backends, and production DevOps workflows, supporting scalable and cost-aware systems. Much of my recent work centers on designing and shipping production AI systems, including AI interviewers, AI video generators, ChatGPT-style applications, RAG-based knowledge systems, and internal AI tools for reporting and automation. In these projects, success depends less on model choice and more on how the surrounding system is designed. I account for context handling, cost control, observability, and system boundaries early so the product remains stable as it evolves. I’m a senior full-stack engineer with 8+ years of experience, and I usually take full ownership of systems from architecture, backend logic, AI integration, frontend, and deployment. This leads to clearer decisions, smoother execution, and far fewer surprises after launch. Clients usually reach out to me when: 👉 An MVP needs to mature into a long-term product 👉 An AI feature must move from prototype to real usage 👉 A system is slowing down, becoming fragile, or growing costly 👉 They want one engineer who can own the full technical picture I’m direct, proactive, and transparent. I flag risks early, explain trade-offs clearly, and help teams make decisions they won’t regret six months later. If you’re looking for a developer who can think like an owner, build like an engineer, and communicate like a partner, we’ll work well together. Looking forward to speaking, Eryk S.

👋 Hi, I'm Parth. 🏆 Expert-Vetted (Top 1% on Upwork) | ⭐ 100% Job Success | 💰 $200K+ Earned | ⏱️ 8,600+ Hours I build production software end to end. React and TypeScript on the front, Node and PostgreSQL behind it, and AI where it actually makes the product better. Most of my work is SaaS: multi-tenant platforms, dashboards, internal tools, and the APIs that power them. 8+ years shipping software teams use every day, with engagements that run two to four thousand hours, because clients keep me around. ━━━━━━━━━━━━━━━━━━━━ ⚙️ Backend Node and Express APIs with authentication, role-based access, third-party integrations, file uploads, and background jobs. PostgreSQL schemas designed properly, Prisma models and migrations, query optimisation, indexing, and transactions. 🤖 AI & Automation OpenAI and Claude integrations in production for chat, content generation, and workflow automation. RAG pipelines with LangChain and vector databases for document search and Q&A. AI agents that talk to external tools and APIs. And AI-assisted development (Cursor, Claude) in my daily workflow, with my own judgment on everything before it ships. 🎨 Frontend This is where I go deepest. React, Next.js, Angular, TypeScript, Tailwind. Design systems, component libraries, data-heavy dashboards, Figma to pixel-accurate production UI, and performance work. 💳 Payments & ☁️ Infrastructure Stripe in production: one-time payments, subscriptions, webhooks, customer management. AWS deployments I run myself (EC2, S3, RDS, CloudFront), plus SSL, environments, and monitoring. ━━━━━━━━━━━━━━━━━━━━ 💬 What clients say ⭐⭐⭐⭐⭐ "Amazing front end developer, thorough, and great communication skills." ⭐⭐⭐⭐⭐ "He not only delivered exceptional development work but also played a key role in architecting our entire application." ⭐⭐⭐⭐⭐ "It's very hard to find high quality developers, and we were very pleased with the work Parth did for us." ━━━━━━━━━━━━━━━━━━━━ ✅ Why clients stay ✔️ I take ownership instead of waiting for instructions ✔️ I communicate clearly and keep projects moving ✔️ I write clean, maintainable code the next developer won't curse at ✔️ I flag problems early instead of hiding them ✔️ I work like part of your team, not a freelancer passing through Most of my work comes from long-term clients and repeat collaborations. I think that says more than any list of technologies. ━━━━━━━━━━━━━━━━━━━━ 🛠️ My Stack 🎨 Frontend — React • Next.js • Angular • TypeScript • JavaScript • Tailwind • Material UI • Redux ⚙️ Backend — Node.js • Express • NestJS • REST APIs • GraphQL • WebSockets • JWT • OAuth 🗄️ Database — PostgreSQL • Prisma • MongoDB • Redis • Supabase 🤖 AI — OpenAI • Claude • LangChain • RAG • Vector DBs • AI Agents • Prompt Engineering ☁️ Cloud & DevOps — AWS (EC2, S3, RDS, Lambda, CloudFront) • Docker • Vercel • GitHub Actions • CI/CD 🔗 Integrations — Stripe • Twilio • Firebase • Auth0 • Clerk • Slack • and other third-party APIs ━━━━━━━━━━━━━━━━━━━━ 🚀 Building something and want a developer who can own the whole thing, front to back? Send me a message, I'd love to hear what you're working on.

I am a Full-Stack Web Developer with 2+ years of hands-on experience building modern websites, dashboards, SaaS applications, REST APIs, and production-ready web platforms. I specialize in building complete web applications from frontend to backend — from responsive React/Next.js interfaces and reusable UI components to Express.js APIs, PostgreSQL databases, authentication, authorization, third-party integrations, and production deployment. My primary focus is React/Next.js development and full-stack SaaS applications, with a strong emphasis on clean architecture, performance, maintainability, and real-world reliability. WHAT I CAN BUILD * Full-stack SaaS and web applications * React/Next.js websites and dashboards * REST APIs and backend services with Node.js/Express * PostgreSQL/Supabase database systems * Authentication and authorization systems * Third-party API and AI integrations * Admin dashboards and business applications * Responsive, SEO-friendly and performance-focused websites * Database optimization, caching and API performance improvements CORE TECHNOLOGIES Frontend: React.js, Next.js, TypeScript, Tailwind CSS Backend: Node.js, Express.js, REST APIs, Sequelize ORM Database: PostgreSQL, Supabase, SQL Engineering: Authentication, Authorization, Sessions, Cookies, API integrations, Caching, Git, GitHub Performance: k6 load testing, API performance optimization, caching and database query optimization SELECTED WORK CyberneticsPlus — B2B Website UI/UX Development Role: Full-Stack Developer Worked on an existing Lovable-built B2B website where the client needed the product interface improved to provide a more polished, engaging and usable experience. * Reworked and improved UI/UX using React, TypeScript and Tailwind CSS. * Improved visual consistency, responsiveness and user interaction across the website. * Worked with the existing Supabase backend and application structure. * Focused on translating an existing product into a cleaner and more professional user experience. * Delivered the improvements within the client's fixed project scope. WhatsApp AI Chatbot — Production MERN/Backend System Role: Full-Stack / Backend Developer Built an AI-powered WhatsApp chatbot for Credit Ghar to support both internal operations and customer conversations through the WhatsApp Business API. The main engineering challenge was handling concurrent conversations reliably while maintaining business-specific AI configuration and conversation context. * Integrated Meta's WhatsApp Business API and webhook system. * Dynamically identified the business from the incoming WhatsApp webhook payload. * Mapped business phone numbers to individual business profiles and AI configurations. * Implemented PostgreSQL unique constraints for conversation-level deduplication. * Used PostgreSQL advisory locks with a business-number + user-number key to serialize concurrent requests for the same conversation. * Added caching for business phone-to-profile/AI configuration mapping to avoid unnecessary database queries. * Retrieved previous conversation history from PostgreSQL and maintained relevant context in the session. * Implemented conversation summarization when message history became large, reducing unnecessary token consumption. * Integrated AI APIs while maintaining structured conversation context. MustCollab — Developer Collaboration Platform Role: Full-Stack Developer Built MustCollab as a platform for developers to collaborate on real-world projects, contribute through defined tasks, connect their GitHub work and earn verifiable recognition for their contributions. The goal was to create a practical environment where developers can build together while creating tangible evidence of their work and experience. * Built the frontend and application workflows for project discovery and collaboration. * Developed REST APIs using Node.js and Express. * Designed and worked with PostgreSQL/Supabase database structures for projects, members, tasks and contributions. * Implemented authentication, authorization and project/member management. * Built collaboration functionality including adding, managing and removing project contributors. * Integrated GitHub repository functionality to fetch and work with repository information.

With over 15 years of experience in full-stack development, DevOps, cloud engineering, and AI automation, I help teams design, build, and ship reliable software systems that are scalable, maintainable, and production-ready. My background bridges application development, infrastructure, CI/CD, cloud architecture, and AI-powered automation. I’ve worked on everything from legacy system modernization and monolithic applications to microservices, serverless backends, event-driven systems, payment integrations, and cloud-native deployments. I’m comfortable taking ownership across the full delivery lifecycle — from understanding business requirements and designing the architecture, to writing clean code, building pipelines, deploying to cloud environments, and supporting production systems. What I Bring to the Table AI & Automation I have hands-on experience integrating AI and LLM-based workflows into real applications and internal tools. This includes building backend services, automation pipelines, data-processing flows, and practical AI-assisted workflows that reduce manual effort and improve delivery speed. I’m especially interested in using AI as a productivity multiplier — combining deterministic engineering with AI assistance, while keeping humans in the loop for validation and quality control. DevOps & Cloud Engineering I have strong experience with AWS, Azure, Docker, Kubernetes, CI/CD, and infrastructure-as-code. I’ve worked with AWS services such as Lambda, ECS, EKS, S3, CloudFormation/SAM, and cloud deployment pipelines. I’ve also designed and maintained CI/CD workflows using tools like GitLab CI/CD, Jenkins, and CodePipeline, including build automation, deployment pipelines, release packaging, environment-based deployments, and production-safe delivery practices. Full-Stack Development I build robust backend systems and APIs using .NET Core, Node.js/TypeScript, Python, and PHP/Laravel, with experience across REST APIs, microservices, background jobs, integrations, and database-driven applications. On the frontend, I’ve worked with modern frameworks such as React, Vue, Angular, Next.js, and Tailwind, building practical, maintainable user interfaces that connect cleanly with backend systems. I also have experience with relational and NoSQL databases including PostgreSQL, SQL Server, MySQL, and MongoDB. Integrations & System Design A big part of my recent work involves designing and implementing complex third-party integrations, including payment providers, webhook systems, reconciliation flows, refund/void logic, and secure request validation. I’m comfortable working through unclear vendor documentation, debugging sandbox inconsistencies, validating API behavior, and turning messy integration requirements into clean, modular backend architecture. Engineering Practices & Leadership I value clean code, maintainable architecture, automated testing, code reviews, and clear communication. I’ve worked in Agile teams, collaborated with cross-functional stakeholders, mentored developers, and handled both implementation and technical decision-making. I’m also experienced in modernizing legacy systems, improving deployment reliability, and helping teams move from manual or fragile processes toward repeatable, automated workflows.