Senior Fullstack Engineer AI (m/f/d) | AI-powered web development & security in Düsseldorf

CLOUDYRION; Düsseldorf; Hybrid; EUR 60,000 - 90,000; Full time

Benefits offered by this job

30 days of vacation

Relocation package

Hybrid work with two remote days weekly

In-house gym and massage chairs

Individual learning and development opportunities

Job summary

CLOUDYRION is looking for a Senior Fullstack Engineer to join our team in Düsseldorf. As a core builder in our AI platform, you will focus on backend services, data integration, and developing user interfaces for effective AI interaction.

The ideal candidate will have over 5 years of fullstack experience, with strong skills in Python, FastAPI, and PostgreSQL, along with familiarity with GCP services. We offer a hybrid work model, 30 days of vacation, and individual learning opportunities.

Qualifications

• 5+ years of fullstack experience with production ownership of complex software, ideally including AI-integrated workflows.
• Proficiency in Python and FastAPI at a senior level, including API design and request validation.
• Strong knowledge of PostgreSQL including schema design and query optimizations.
• Async at scale using Celery or equivalent frameworks.
• Experience with React and TypeScript for data-driven UI development.
• Familiarity with deployment practices including Docker and Kubernetes.
• GCP experience including Cloud Run and Vertex AI.

Responsibilities

• Build and extend FastAPI endpoints and task orchestration.
• Design how the platform's data is stored and served.
• Create user interfaces that integrate AI output effectively.
• Collaborate to ship features from pipelines to UI.
• Shape test strategies and improve the performance of the platform.

Skills

Fullstack experience

Python

PostgreSQL

React

TypeScript

Docker

Kubernetes

GCP

AI/LLM systems

Security engineering

Job description

YOUR MISSION

As a Senior Fullstack Engineer, you are a core builder in our Research and Development initiative: an AI platform that automates security reviews at the architecture level. You spend most of your time on the backend – building AI-integrated services, async pipelines, and the APIs that power our research platform. You also build the surfaces through which our consultants work with AI output, turning probabilistic results into something people can genuinely trust.

YOUR ROLE

• 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 WebSocket/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.

YOUR PROFILE

Must haves

• 5+ years of fullstack experience with production ownership of complex software – ideally including AI-integrated workflows
• Python and FastAPI at senior level: API design, request validation with Pydantic, structured error handling
• PostgreSQL: schema design, migrations, query optimizations, audit and versioning patterns
• Async at scale: streaming responses (SSE/WebSocket), bounded concurrency, retry strategy across nested boundaries, idempotent task design with Celery or equivalent
• React and TypeScript: state management (TanStack Query, Zustand or similar), data-driven UI for domain experts
• Production deployment: Docker, Kubernetes or equivalent, CI/CD, and observability tooling (Sentry, OpenTelemetry or similar)
• Product judgement: you know what fits the roadmap and you speak up when something doesn't
• Experience building SDLC and agile practices in a small team
• GCP experience: Cloud Run, GCS, Secret Manager, Vertex AI
• Vector search (Weaviate, pgvector or similar) or graph databases (Neo4j or similar)
• AI/LLM systems: eval frameworks, prompt versioning, regression on non-deterministic outputs
• Security engineering: authn/authz patterns, session management, secrets handling
• Test strategy: experience building testing practices systematically within a team
• Background in developer tools, data-heavy SaaS, or expert-facing products

WHY CLOUDYRION

• We support EU Blue Card sponsorship and offer a relocation package for international hires
• 30 days of vacation plus additional days off on Christmas, New Year’s Eve, and your birthday
• Hybrid work with two remote days per week, trust-based working hours and the opportunity of Workations in any EU country
• Individual learning and development opportunities, including full coverage of advanced trainings, certification costs, and educational leave for exam days
• In-house gym, massage chairs, gaming area, and dedicated break spaces
• Regular team events and plenty of space for real collaboration

Contact:

Katharina - People & Culture

You can find information on data protection during the application process at CLOUDYRION here.