Hire the Best TypeScript Developers

Hello, my name is Lucas Schimidt. I am a full stack developer with knowledge in Python, SQL database language, and web technologies! With over 6 years of experience I have specialized in creating customized solutions, including web development, web design and automation. Passionate about technology!

I help businesses ship production-ready AI features (RAG systems, LLM integrations, chat assistants, and workflow automation) on top of clean, scalable web apps using Laravel and Next.js. Most developers treat AI as a plugin. I build it as part of the architecture, so the intelligence actually fits your data, your stack, and your users. I'm a full-stack developer with a perfect 5.0 rating across every completed project, now focused on the area where I do my best work: connecting modern web applications to real AI capability. While a lot of AI developers live entirely in the Python world, I work where most businesses actually are (Laravel, Next.js, TypeScript, and PostgreSQL) and add the AI layer on top without forcing you to rebuild everything. What I can build for you: • RAG systems: let your users ask questions and get answers grounded in your own documents, with embeddings, vector search (pgvector), and streaming responses. • LLM integration: Claude and OpenAI wired directly into your app for chat, content, search, and smart features that go beyond a simple API call. • AI assistants & lead/support flows: conversational tools that capture leads, answer customers, and handle real intent, not just scripted FAQ replies. • AI automation: n8n workflows that connect your AI to the tools you already use (calendars, CRMs, notifications) so the busywork runs itself. My stack: Backend: Laravel, REST APIs, Node.js · Frontend: Next.js, React, TypeScript, Tailwind CSS · AI: Claude API, OpenAI API, RAG/embeddings, pgvector · Automation: n8n · Databases: PostgreSQL, Supabase, MongoDB How I work: I keep things clear from day one: we agree on scope and milestones before I write a line of code, I send regular updates so you're never guessing, and I deliver tested work with documentation you can actually hand to the next person. You get a developer who communicates like a partner, not a contractor who disappears. You can see real, working examples in my portfolio below: AI applications I've built across real estate, e-commerce, healthcare, and document Q&A, each one demonstrating a different piece of the AI + full-stack puzzle. If you've got an idea for an AI-powered product, or an existing app that needs real AI capability added, send me a message and tell me what you're building. I'll tell you honestly how I'd approach it.

I build production dashboards and AI-powered SaaS - RAG memory systems, multi-LLM apps, and real-time voice agents - on a Next.js / React / TypeScript stack. Full-Stack Developer, 4+ years building scalable, secure web apps across AI, healthcare, web3, and IoT - from PostgreSQL schema and payments to streaming LLM features and pixel-perfect UI. Teams also bring me in to debug, harden, and fix vulnerabilities in live products. WHAT I DO BEST • AI / LLM: RAG and vector search, real-time audio agents, persistent memory, multi-provider orchestration (Claude, OpenAI), LangChain, Vercel AI SDK • Full-stack SaaS: multi-tenant dashboards, role-based access, admin panels, drag-and-drop UIs, PDF and media handling • Payments & security: Stripe and other gateways (one-time + subscriptions), webhook-verified flows, security audits and vulnerability fixes • Web3: wallet connections, smart-contract interactions, NFT / quest platforms SELECTED PROJECTS • AI Coaching Platform - production AI SaaS with real-time audio agents, a RAG memory system (vector DB + Postgres) grounding every response in user history, multi-provider LLM streaming, and automated workflows. (Next.js, Express, Supabase, Vercel AI SDK, LangChain) • Healthcare Dashboard - role-based patient and doctor portals with task management (kanban, drag-and-drop), calendar, AI doctor tools, and PDF/DOCX handling. • NFT Quest Platform (web3) - wallet and smart-contract interactions; full flow from admin quest creation to the user experience; migrated Vue/Nuxt to Next.js. • Prize Competition Platform - secure card payments (webhook verification, settlement tracking), instant-win mechanics, and admin payouts; found and fixed a payment vulnerability in a security audit. • Analytics Dashboards - complex data builder with dynamic visualizations and secure profile management. • SaaS for Artists - auth, group collaboration, media handling (text and audio), audio players, and calendar. TECH STACK Frontend: React, Next.js (App Router, SSR), TypeScript, Tailwind, shadcn/ui, Framer Motion, Redux Toolkit, TanStack Query Backend: Node.js, Express, Nest.js, serverless (Firebase / Supabase functions), REST APIs, webhooks, cron jobs AI / LLM: Claude, OpenAI, Vercel AI SDK, LangChain, RAG, vector databases Data & Auth: PostgreSQL, Supabase, MongoDB, Firebase; NextAuth, Firebase Auth, JWT, OTP Payments: Stripe + other gateways (one-time + subscriptions) Tools: GitHub / GitLab, Figma, Vercel, Sentry HOW I WORK Clean, maintainable code. Honest timelines and clear communication. I care about what bites later - security, edge cases, and performance.

I'm a senior full-stack web developer with 6+ years and over 17,000 hours spent building, testing, and shipping production web applications from end to end. I work primarily across React and Next.js on the frontend and Node.js — with both Express and NestJS — on the backend, backed by PostgreSQL and MongoDB, with TypeScript throughout. My standard isn't something you have to take on faith. I'm in the top 2% of all contributors on Stack Overflow, with more than 9,800 reputation earned by helping developers around the world solve real engineering problems. That number isn't self-awarded — it's the verdict of thousands of developers who found my answers clear, correct, and worth upvoting. I bring that same precision to every line of code I write for a client. When I take on a project, I build the full slice. On the backend, I work with Express for lean, focused services and NestJS when a project needs the structure of a modular, dependency-injected architecture that stays organized and testable as it grows. I model data in whichever database fits the problem — PostgreSQL for relational integrity, with migrations, transactions, and proper indexing, or MongoDB for flexible, document-driven workloads — and I access it through a type-safe ORM. I expose clean, validated endpoints with typed DTOs, and I reach for caching and background jobs when a feature needs to scale. On the frontend, I build polished, accessible interfaces in React and Next.js. I write in TypeScript end to end so bugs surface at compile time instead of in production, and I cover the logic that matters with unit and integration tests so that refactors stay safe and releases stay calm. I ship through CI/CD pipelines with Docker, so what runs on my machine is exactly what runs in yours — and I use modern AI-assisted tooling such as Cursor and Claude Code to move quickly without compromising any of it. Whether you need someone to untangle an existing codebase or build something new from an empty repository, I take full ownership of the result: I communicate clearly, I meet my deadlines, and I deliver work you don't have to babysit. Recently, I've built a hospital appointment-scheduling calendar, a volunteer-teacher registration and follow-up system, and several full MERN web applications. Send me a message describing what you're building, and I'll tell you honestly how I'd approach it. Skills: ➤ Languages ⁃ JavaScript ⁃ TypeScript ➤ Frontend Frameworks ⁃ React ⁃ Next.js (App Router + Server Components) ⁃ React Hooks ⁃ Angular ⁃ Vue.js ➤ UI & Styling ⁃ HTML ⁃ CSS ⁃ Sass / SCSS ⁃ Tailwind CSS ⁃ Material UI (MUI) ⁃ shadcn/ui ⁃ Chakra UI ⁃ styled-components ⁃ CSS Modules ⁃ Framer Motion ➤ State Management ⁃ Redux / Redux Toolkit ⁃ Zustand ⁃ Context API ⁃ TanStack Query (server state) ⁃ SWR ➤ Forms & Validation ⁃ React Hook Form ⁃ Formik ⁃ Zod ⁃ Yup ➤ Backend ⁃ Node.js ⁃ Express ⁃ NestJS ⁃ GraphQL (Apollo) ⁃ REST APIs ⁃ tRPC ⁃ WebSockets / Socket IO ⁃ Authentication (JWT / OAuth / NextAuth) ➤ Databases & ORMs ⁃ MongoDB ⁃ Mongoose ⁃ PostgreSQL ⁃ MySQL ⁃ Redis ➤ DevOps & Tooling ⁃ Git ⁃ GitHub ⁃ Docker ⁃ GitHub Actions (CI/CD) ⁃ Vercel ⁃ Netlify ⁃ AWS (EC2, S3, Lambda) ⁃ Nginx ⁃ Vite / Webpack / Turbopack ⁃ ESLint / Prettier ➤ Testing ⁃ Jest ⁃ Vitest ⁃ React Testing Library ⁃ Cypress (E2E) ➤ AI-Assisted Development ⁃ Cursor ⁃ Claude Code ⁃ GitHub Copilot ⁃ LLM API integration (OpenAI / Anthropic) ⁃ Prompt engineering ⁃ RAG (Retrieval-Augmented Generation) ⁃ Vector databases (Pinecone / pgvector) ⁃ LangChain ➤ Practices ⁃ Agile / Scrum ⁃ Accessibility (a11y) ⁃ Responsive design ⁃ Performance optimization ⁃ Code review Thank you!

Need AI added to your app, a workflow automated, or an MVP finished? I can help you scope it, build it, and ship it without overcomplicating the first milestone. I build AI products that survive real users, real data, and real business workflows: SaaS MVPs, AI agents, RAG systems, voice AI, and automation inside existing products. ⭐ Top Rated Plus | Top 3% of performers on Upwork ✅ 10+ years building SaaS and AI products | 100+ projects delivered ✅ AI that ships: RAG, AI agents, MCP, Voice AI, LLM integration ✅ Full stack: Next.js, React, TypeScript, Python, Node.js, PostgreSQL, AWS ✅ SaaS, MVPs, automation, fintech, healthcare, construction, legal tech, and sales products You can hire me when: - You need one AI feature added to an existing app - You want OpenAI, Claude, Gemini, or MCP integrated into your product - You need a RAG system over PDFs, documents, knowledge bases, or internal data - You want a voice AI agent for calls, bookings, lead qualification, or CRM updates - You have a workflow involving documents, calls, follow-ups, data entry, or reporting that should be automated - Your MVP is half-built, buggy, slow, or stuck before launch - You need someone to build a full SaaS product from idea to deployment I work well on both small and large projects. If the right first step is a quick audit, prototype, bug fix, integration, or one-week milestone, I will tell you that. If the project needs a full build, I can own the architecture, frontend, backend, AI layer, deployment, and documentation. The part most AI freelancers skip: AI is rarely the whole product. It usually needs a backend, dashboard, auth, billing, permissions, logs, human review, and deployment around it. I build both the AI layer and the product around it. WHAT I DO: - AI SaaS & MVP builds: idea to deployed product with auth, billing, dashboards, and AI layer - AI inside existing products: RAG, agents, MCP, LLM features, document AI, and automation - Voice AI: agents that answer calls, book appointments, qualify leads, and log to your CRM - RAG and document AI: source-grounded answers, OCR, extraction, citations, and review queues - Workflow automation: documents, follow-ups, data entry, reporting, and API integrations - Rescue & ship: half-built MVPs refactored, hardened, and launched RECENT DELIVERIES: - AI sales CRM: call transcription, follow-up automation, multi-tenant pipelines - RAG document platform with every answer cited to source - AI financial intelligence platform: open banking + accounting sync into one ledger - AI voice agents for healthcare and sales, answering real calls daily - Turnkey B2B SaaS platform for the construction industry, end to end HOW I WORK: - I start by understanding the workflow, users, data, and business goal - I suggest the smallest useful first milestone when possible - I scope clearly before code is written, so you know cost and timeline up front - I can work on focused tasks, short prototypes, rescue work, or full product builds - I work full time on Upwork with overlap for US and European business hours If you need one AI feature, a quick prototype, a stuck MVP fixed, or a full SaaS product built, send me a short description of what you have and what you want it to do. I will reply with the clearest next step, the likely scope, and the first milestone I would recommend. Tech Stack: AI and LLM: OpenAI, Claude, Gemini, LangChain, LangGraph, CrewAI, MCP, function calling, model routing RAG and vector search: RAG pipelines, embeddings, semantic search, pgvector, Pinecone, document AI, OCR AI agents and automation: multi-agent systems, AI copilots, workflow automation, document extraction with review queues AI reliability: evaluation sets, hallucination reduction, human-in-the-loop workflows Voice AI: Vapi, Retell, ElevenLabs, Deepgram, OpenAI Realtime, Twilio Frontend: Next.js, React, TypeScript, Tailwind CSS, React Native Backend: Node.js, Python, FastAPI, REST and GraphQL APIs, WebSockets Databases: PostgreSQL, Supabase, Redis, MongoDB SaaS architecture: multi-tenant, tenant isolation, RBAC, Stripe billing, admin dashboards Cloud and DevOps: AWS, Docker, Vercel, CI/CD, monitoring Security and compliance: OAuth2, JWT, encryption, audit logs, HIPAA-aware builds, KYC/AML flows Integrations: Stripe, Plaid, open banking APIs, QuickBooks, Xero, Twilio, CRMs, ERPs Industries: AI SaaS, AI agents, document AI, RAG, FinTech, open banking, healthcare, B2B SaaS, startup MVPs, construction tech, legal tech, sales and CRM automation, voice AI, recruiting

I have experience working as a Founding Engineer in more than 2 startups, I am a AI, Full-Stack, Blockchain Engineer focused on building scalable, performant web applications. I don't just write code; I engineer production-ready systems using the modern web stack. Whether you need a complex dashboard, a high-performance backend, or a reliable SaaS platform, I deliver clean, maintainable, and type-safe code. What I Bring to the Table: My experience ranges from building AI-powered tools like OpenScope to engineering infrastructure monitoring systems like Watchtower (similar to Better Uptime). This background ensures I can handle: Complex Frontend Logic: Expert in React and Next.js (App Router). I build responsive, glitch-free UIs that handle complex state management effectively. Robust Backend Architecture: Deep experience with Supabase and PostgreSQL + Prisma. I design database schemas that scale and APIs that are secure and fast. System Reliability: I understand what it takes to keep an app running, from Docker containerization to CI/CD pipelines. My Core Tech Stack: Frontend: Next.js, React, TypeScript, Tailwind CSS. Backend: Node.js, Supabase (Auth, Database, Realtime), Prisma ORM, PostgreSQL. DevOps & Tools: Docker, Git, Vercel, DigitalOcean. Why Work With Me: High Standards: I use TypeScript strictly to prevent bugs before they happen. Communication: I provide clear updates and ask the right questions to ensure we are building exactly what you need. Versatility: Comfortable working as a solo developer or integrating into an existing engineering team. Let's discuss your project requirements. I am available for both long-term collaboration and focused development sprints.