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Steven ObstSO

Steven Obst

Full-Stack Engineer | LLM & API Integration

€780/day
Berlin, DE
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Steven

Berlin-based Full-Stack Engineer specializing in AI and LLM integration, API and system integration, and workflow automation.
I bring LLM-powered systems into production.
RAG architectures, Multi-Agent workflows, MCP integration, and Multi-Model orchestration via OpenRouter with Cost-Tiered Routing and evaluation logic.

I also build clean integrations between systems, via REST, Webhooks, and OAuth, with n8n-orchestrated pipelines that transform error-prone manual workflows into reliable automation, including idempotency, retries, and error handling for production.

I work end-to-end: Next.js, React, and TypeScript on the frontend, Python, FastAPI, and Flask on the backend, Supabase and PostgreSQL as the data layer, Docker and CI/CD for deployment and operations.

Typical projects: AI assistants and internal copilots, RAG and agentic systems, B2B and B2C SaaS platforms, data aggregation pipelines from heterogeneous sources, and API integration layers. The current mandate is a BRAO and GDPR-compliant Legal-Tech platform with an anonymization gateway for EU-only LLM calls.

I now work AI-augmented, delivering quickly and cleanly across various system landscapes.
  • German

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Self-Employed
    Independent Engineering & Production Delivery
    LEGAL
    December 2024 - Today (1 year and 7 months)
    Berlin, Germany
    Multiple production systems across legal-tech, SaaS, and automation. Selection:

    - Legal-tech platform (BRAO/GDPR-compliant): n8n-orchestrated bidirectional sync layer, anonymization gateway routing all LLM calls EU-only, RAG agent for case research. Next.js, FastAPI, Supabase.

    - Career-intelligence SaaS, built solo: five-stage LLM evaluation pipeline with cost-tiered routing over Anthropic and OpenRouter, Stripe billing, bilingual Next.js frontend.

    - Headless data-aggregation engine across 29 heterogeneous sources, three-stage deduplication, circuit breakers, plugin architecture. Python, PostgreSQL, Docker.

    - B2B field-sales PWA (FMCG), offline-tolerant, RLS. Next.js, TypeScript, Supabase.
    LLM API n8n Fullstack Compliance
  • Better Payment GmbH (FinTech),
    Technical Project Manager
    BANKING AND INSURANCE
    January 2021 - January 2024 (3 years)
    Germany
    - Primary technical escalation point between onboarding and engineering; resolved platform issues and aligned with CTO on complex integrations
    - Ran full delivery cycle: client requirements intake, sprint planning, ticket management, developer coordination through release and client presentation
    - Structured requirements and GitHub workflows; built WordPress + Zapier onboarding pipeline routing client information into structured support tickets
  • Getränke Stöhr GmbH
    IT Specialist
    E-COMMERCE
    January 2017 - January 2019 (2 years)
    - Sole IT contact for 50+ staff across office and warehouse operations
    - Built WordPress/WooCommerce webshop handling 100+ monthly orders with warehouse delivery integration

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Education

  • Masterschool Institute of Technology
    2026
  • Apprenticeship: Wholesale and Foreign Trade Clerk
    Deltatecc GmbH
    Ausbildung: Kaufmann im Groß- und Außenhandel

Skill set

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