Senior Full Stack developer (Python/React)
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Summary
Senior full-stack developer (Python/FastAPI, TypeScript/React) acting as an independent technical owner on an AI-powered SaaS product for professional services — building LLM agents, document processing, RAG search, backend APIs and queues on cloud infra with Docker/CI-CD. Full-time engagement for 6-8 months, remote in Europe.
Project: Fast-growing SaaS startup transforming the professional services industry with AI-powered software that automates complex workflows across documents, search, and matter management.
Responsibilities:
- Act as an independent technical owner to deliver complex product and infrastructure features from architectural design to deployment
- Build and optimize AI-powered workflows, including LLM agents, document processing, and tool calling
- Design robust backend systems, APIs, data flows, queues, and third-party integrations
- Debug and resolve complex production issues across the full stack using traces and logs
- Utilize AI coding tools (Claude Code, Cursor, Codex) as a daily force multiplier to accelerate development velocity
Requirements:
- 7+ years of professional software engineering experience
- Strong proficiency in Python with FastAPI (or similar frameworks) and TypeScript with React
- Advanced SQL expertise and schema design, preferably with PostgreSQL
- Solid experience with cloud infrastructure (Azure, AWS, or GCP), Docker, and CI/CD pipelines
- Deep architectural skills for designing highly reliable async systems, APIs, workers, and queues
- Hands-on technical experience operating production LLM features, agents, prompt workflows, and RAG/search systems
- Practical experience with observability, metrics, and tracing tools (Datadog, PostHog, Langfuse, OpenTelemetry)
- Proven track record of autonomous, end-to-end delivery of production-ready systems
Full-time. 6-8 months, start in 2-3 weeks