11/06/2026 updated
100 % available
Full-Stack Developer | TypeScript, React Native, Node.js | DevOps & Production Infrastructure
USA
Worldwide
IHK Computer Science Expert in Software DevelopmentAbout me
Full-stack developer with five years of experience in TypeScript/Node.js, React/React Native, PostgreSQL, Docker and more. I deliver web and mobile products from architecture to production. I am Co-Founder & (part-time) CTO of SLT IT-Solutions, where we build Asenso.
OAuth 2.0AI AgentsGitHub ActionsJavaScriptUbuntu (Operating System)Code ReviewDevOpsGitHubPostgreSQLNode.jsSoftware ArchitectureOpenid ConnectNext.jsServer AdministrationSQLite
Core Stack
Five years of experience building and operating web and mobile products, from architecture to production. My main stack is TypeScript and Node.js with React, React Native/Expo, and Next.js, plus Python and FastAPI when needed. For handling PostgreSQL data I use Drizzle or Prisma. Zod in TypeScript and Pydantic in Python handle validation. I use S3-compatible storage for files, handle auth with OAuth 2.0/OIDC, and use SSE to handle real-time updates.
For containerization I use Docker and Swarm for orchestration and multi-node deployments. Traefik handles routing and TLS, GitHub Actions runs CI/CD, and I run everything on Linux servers.
How I Work
I work primarily through AI coding agents. They handle implementation, refactoring, tests, code review, debugging, documentation, and research, while I focus on specs, architecture, and verification. I let the agent draft a plan or two, add my own if I have a better idea, and let it compare the trade-offs before I decide. I read the critical parts myself.
While I do still love high quality, artisanally crafted, pasture-raised, handwritten code, sometimes we need to focus on the issue at hand, like launching a product or earning revenue, before we go back over it with a more critical lens to fix all the nits. There is a right time for perfectionism, but most of the time business priorities set the schedule, even if our developer hearts bleed.
I set realistic timelines because I’ve spent years planning and shipping projects on my own as a freelancer. Having co-founded SLT IT-Solutions and served as CTO, I know firsthand how fast feature creep can ruin a launch, so I keep initial scope tight and iterate. And when it comes to client communication, I’m direct, because honesty is the only way to build real trust.
tags (ignore):
TypeScript, JavaScript, Python, Rust, SQL, Bash, React, Next.js, React Native, Expo, Tailwind CSS, Radix UI, shadcn/ui, Zustand, i18next, Node.js, Bun, Express, FastAPI, Pydantic, REST, Zod, pg-boss, JWT/JWKS, OAuth 2.0, OpenID Connect, NextAuth, BetterAuth, SSE, PostgreSQL, psycopg3, Drizzle ORM, Prisma, SQLite, MongoDB, Redis, Docker, Docker Swarm, Docker Compose, Nginx, Traefik, GitHub Actions, CI/CD, Object Storage, MinIO, Amazon S3, SeaweedFS, WireGuard, restic, Linux, ffmpeg, HLS, pdf-lib, Sharp, Google Maps API, Plotly, Recharts, Google GenAI, OpenAI, MapLibre, HealthKit, Health Connect, APNs, FCM, Playwright, Jest, pytest, SeleniumBase, BeautifulSoup, BPMN, Monorepo, Local-First, Event-Driven APIs, Job Queues, Layered Validation, Repository/Policy Patterns, Service-Oriented Architecture, Software Architecture, DevOps, Full-Stack, Web Development, Mobile Development, API Development, Web Scraping, Data Visualization, AI Integration, AI-Assisted Development, Authentication, Push Notifications, Offline-First, Database Migrations, E2E Testing, Self-Hosted, TLS, SQLAlchemy, Electron, JSON Schema, Next.js Server Actions, Tokio
Experience
Professional experience5 - 10 years
Freelancer since2024
Languages
GermanNative speakerEnglishFluent
Project history
I co-founded the company and lead engineering for Asenso, a fitness and health social platform. I handled architecture, infrastructure, and mobile delivery: Bun/TypeScript monorepo, Expo/React Native app, Express API, PostgreSQL/Drizzle, self-hosted auth/storage/maps, and Docker Swarm with CI/CD, backups, and rollback. Privacy-first: no data selling, sensitive health data handled safely. The app supports offline sync with encrypted local storage, Apple HealthKit/Google Health Connect integrations, push notifications, photo uploads, real-time updates and AI meal analysis from photos and text.
Built a child-protection training platform for iOS, Android and web. As the sole developer, I designed the entire architecture and turned the client's Figma mockups into a full product: Expo/React Native app, Next.js admin dashboard, Express API, PostgreSQL/Drizzle, MinIO, HLS video streaming with ffmpeg, PDF certificates, Google/Facebook OAuth, Docker Compose with Nginx/TLS, migrations, backups, and multi-arch GHCR images. Delivered; market launch pending approval.
Built a real-estate data platform for a private client. I was the sole developer and built it end to end. Python/FastAPI services aggregate listings from three German real-estate portals into PostgreSQL, with AI extraction into a typed schema. Pydantic v2 with validators, discriminated unions, TypeAdapter, and pydantic-settings; JSON schemas for LLM-based extraction. Next.js 15/React 19 dashboard with an interactive Google Maps view, Plotly/Recharts, URL-based filter state, image caching, NextAuth v5, and profit calculations; psycopg3 pooling, Docker Compose, and Dockerized Next.js deployment.