Senior Fullstack Engineer (all genders) | Python, React | LLM Security Platform | Düsseldorf

Senior Fullstack Engineer (all genders) | Python, React | LLM Security Platform | Düsseldorf at CLOUDYRION GmbH

Please note that this position requires EU work authorization.

Language:
English - Fluent

• Fullstack experience:
  You bring 5+ years with recent production ownership of complex, enterprise-level software, ideally including AI-integrated workflows you've taken from pipeline to real users.
• Python and FastAPI at senior level:
  You design APIs, validate requests with Pydantic, handle errors cleanly, and integrate confidently with our AI/ML pipeline.
• PostgreSQL:
  You know your way around schema design, migrations, query optimization, and audit/versioning patterns.
• Async at scale:
  You're comfortable with streaming responses (SSE/Web Socket), bounded concurrency, retry strategies across nested boundaries, and idempotent task design with Celery or equivalent.
• Vector search:
  You have working knowledge of Weaviate, pgvector, or similar.
• LLM production experience:
  You've shipped features where LLM output flows end-to-end through real pipelines to real users in a live production environment, including streaming responses, structured output handling, retries, and graceful recovery from non-deterministic behaviour.
• React and Type Script:
  You build data-driven UI for domain experts using state management like Tan Stack Query or Zustand, and you understand that AI/LLM product UX is fundamentally different from CRUD UX.
• Production deployment:
  You're at home with Docker, Kubernetes or equivalent, CI/CD, and observability tooling like Sentry or Open Telemetry.
• End-to-end ownership:
  You've driven complete features or systems from architecture through to production, bringing a rounded understanding of how a platform fits together as a whole.
• Product judgement:
  You read a feature request and know whether it fits where the platform is going, and you speak up early, shaping engineering and design decisions to keep the consultant workflow strong.
• SDLC and agile practices:
  You've helped build these in a small team.
• English communication:
  You communicate confidently and clearly in English, spoken and written.

• GCP experience:
  Cloud Run, GCS, Secret Manager, Vertex AI.
• Graph databases:
  You've worked with Neo4j or similar alongside vector search, or you're curious to pick them up fast.
• AI/LLM eval tooling:
  You're familiar with eval frameworks, prompt versioning, or regression testing on non-deterministic outputs.
• Security engineering:
  You know authn/authz patterns, session management, secrets handling, or you're familiar with OWASP, threat modelling, and MITRE ATT&CK.
• Test strategy:
  You've helped build testing practices systematically within a team.
• Domain background:
  You've worked in developer tools, data-heavy SaaS, or expert-facing products.
• German:
  You have language skills at A2+ level.

• Backend & API:
  Build and extend FastAPI endpoints, Celery task orchestration, PostgreSQL schemas, and GCS object storage; clean integration with the AI/ML pipeline.
• Data Flow Ownership:
  Design how the platform's data is stored, versioned, and served to the UI.
• Knowledge Approval Workflow:
  Design and extend the lifecycle layer for documents in the platform: data model, SLA tracking, escalation signals, and provenance metadata.
• Consultant-facing UI:
  Build the surfaces where AI output meets users: long running task UX, real time updates, and the path from polling to Web Socket/SSE streaming.
• End-to-End Delivery:
  Work with the AI team and an external UX designer to ship features from pipeline to UI – and own what works under the hood.
• Platform Reliability:
  Shape test strategies, structured logging, performance budgets, and the SDLC and agile practices the team needs as it grows.

We are the Guardians of Cyberspace: here, you’ll find a young, highly qualified and incredibly motivated team that not only understands cybersecurity, but lives and breathes it.

We work to the highest standards, think strategically, act with precision and focus on solutions that deliver sustainable results. For us, excellence isn’t just a buzzword, it’s our everyday standard.

At the same time, we know that the best results come from places where…