Freelancer profile translated to English.

Description

Senior Full-Stack Engineer · React, Next.js, TypeScript · Python (Django, FastAPI)

With nearly 10 years of experience, I build production-ready web applications for domains where correctness matters: Health-Tech, Legal-Tech, Enterprise, and Civic-Tech. From the initial wireframe to scaled production — as an individual engineer or as a technical lead.

What I deliver for clients

• 4+ years co-developing a CE-certified medical device platform (Frontend + Backend)

• Tech Lead at BIH @ Charité Berlin: 4-person team for AI-powered medical image analysis (DICOM, Cornerstone.js)

• Legal-Tech AI SaaS from concept to production in 8 months (Django REST, FastAPI/LangChain, Next.js, Stripe, Vector DBs)

• Enterprise scheduler for 35 cranes / 350+ wind farm projects at a wind turbine manufacturer (Next.js 15, React 19, Bryntum)

• Citizen participation platform mein.berlin (Liquid Democracy e.V.): Real-time notifications, geo-search profiles, Wagtail CMS

Own SaaS Platform

hexermap.com — conceived, built, and operated on Azure by myself. 4,300+ automated tests, Stripe billing, real-time multiplayer. Those who deliver this alone can also lead complex team projects.

Stack

Frontend: React, Next.js, Astro, TypeScript, Tailwind, Zustand, PixiJS · Testing: Playwright, Vitest, Jest

Backend: Python (Django, FastAPI), Node.js, PostgreSQL, Supabase, GraphQL, REST, SSE Streaming

Cloud & Quality: Azure, Docker, Stripe, OAuth · WCAG 2.1 AA, BITV 2.0, Performance Budgets

Where I bring added value

Translating complex requirements — compliance, audits, real-time data, accessibility — cleanly into software. Without over-engineering. Tests, observability, accessibility, and UX are part of the deliverable, not a "nice-to-have".

Location: Rottweil · 100% Remote · Native German, Fluent English

Let's build something meaningful together.

Industry field of expertise

Languages

German
Native or bilingual
English
Fluent
Russian
Basic

Workplace preferences

Remote only

Primarily works remotely

Birds on Mars GmbH
Bird Detection Visualization
PUBLIC SECTOR
December 2025 - December 2025
Development of an interactive web application withReact, TypeScript, and Vitefor visualizing bird detection data. Connection to aGraphQLAPI usingApollo Clientfor efficient data fetching and caching. Implementation of a performant map view withMapLibre GL**, including client-side clustering via **Supercluster**. Dynamic display of **GeoJSONdata, including optimized layer updates. Creation of a reactive UI withAnt Designcomponents, **React Hooks**, and styling using **Tailwind CSS**.
TailwindCSS React.js GraphQL Typescript MapLibre GL
Birds on Mars GmbH
Process Optimization for Wind Turbine Manufacturer
ENERGY AND UTILITIES
August 2025 - March 2026 (7 months)
Development of an interactive web platform to replace manual Excel planning for a wind turbine manufacturer. Conception and implementation of a performant scheduler(Next.js 15, React 19, Bryntum)with drag & drop, hierarchical resources, and real-time validation. The solution visualizes dependencies, optimizes the deployment planning of crane teams, and serves as the data basis for automated cost calculations in the backend.
Next.js React.js Web Development Bryntum Scheduler REST
Legalneer
AI for Lawyers
LEGAL
June 2024 - February 2025 (8 months)
Full-stack development of legalneer, a legal-tech AI platform with integration ofDjango REST Framework**, **FastAPI/LangServe**, and **Next.jsfor AI-powered legal analysis. Building a document management system with S3/Pinecone vector databases, orchestrating real-time LLM streaming between backend and frontend, and implementingStripesubscriptions withOAuth social authentication**. Development of **session management**, token tracking, and **React streaming UIwith custom hooks for AI response handling.
Django FastAPI React.js REST Django Rest Framework