Senior Full-Stack Engineer (m/f/d)
In Germany - Berlin | Bonn | Cologne | Frankfurt/Main | Hamburg | Munich
We are seeking an experienced Senior AI Full-Stack Engineer to contribute to designing and building scalable SaaS products within our AI Lab. In this role, you’ll combine deep technical expertise with strategic vision to build AI-powered products that will help transform our clients’ business models and enable their growth.
Simon-Kucher is at the forefront of innovation in driving commercial excellence, revamping business models, developing solutions and methodologies for unlocking better growth of our clients. Within AI Lab, we are developing cutting-edge large scale AI products to deliver sustained top-line impact for our clients.
Are you interested in working in a team of AI evangelists with a can-do attitude? Want to experience the dynamics of agile processes in open-minded teams? How about getting creative in a startup atmosphere with a steep development curve and flat hierarchies? And most importantly, do you want to make a difference? Then you've come to the right place.
What makes us special:
1. Advance your career with exciting professional opportunities in our thriving company with a startup feel
2. Innovate by transforming ideas into cutting-edge AI products, championing AI and Generative AI through creative experimentation to push boundaries and deliver transformative solutions.
3. Voice your unique ideas in a culture defined by our entrepreneurial spirit, openness, and integrity
4. Feel at home working with our helpful, enthusiastic colleagues who have great team spirit
5. Broaden your perspective with our extensive training curriculum and learning programs (e.g. LinkedIn Learning)
6. Speak your mind in our holistic feedback and development processes (e.g. 360-degree feedback)
7. Satisfy your need for adventure with our opportunities to live and work abroad in one of our many international offices
8. Enjoy our benefits, such as hybrid working, daycare allowance, corporate discounts, and wellbeing support (e.g. Headspace)
9. Unwind in our break areas where you can help yourself to the healthy snacks and beverages provided
10. See another side of your coworkers at our frequent employee events, World Meetings and Holiday Parties
How you will create an impact:
11. Ship secure and accessible UIs and services that turn data/ML/GenAI into delightful, explainable features.
12. Build and launch multi‑tenant app modules (UI + services) with role‑based access and audit logging.
13. Implement RAG‑powered features with high UX trust signals (citations, source previews, evaluations in‑product).
14. Establish a UI design system and component library for reuse across products.
15. Design and build TypeScript/React (or equivalent) front ends and service layers (Node/NestJS or Python/FastAPI).
16. Implement authN/authZ (OIDC), tenancy boundaries, rate limiting, and usage metering.
17. Integrate ML/LLM endpoints via a gateway; instrument for latency, errors, and cost; implement fallbacks.
18. Own end‑to‑end testing (contract, e2e, accessibility), CI/CD, and release automation.
19. Collaborate with Product team on technical discovery and feasibility and with UX Designer on IA/UX.
20. Write technical documentation.
21. Work with Cloud Platform Engineer to deploy and manage services securely.
About you:
22. 7+ years shipping production web apps; strong TypeScript; React/Next.js; REST/GraphQL; Node or Python services.
23. Deep experience designing and operating secure multi-tenant systems; API design; async messaging; caching; and performance profiling.
24. Experience integrating ML/LLM services (streaming, tool use, evals, guardrails) and building RAG features with ingestion pipelines, embeddings, vector stores, and retrieval orchestration.
25. Python (advanced); FastAPI (async/await, dependency injection, middleware); Pydantic (validation, serialization, API contracts).
26. Data layer expertise: SQLAlchemy (ORM internals, performance tuning); Alembic (migrations); Pytest (unit and integration testing).
27. React (advanced), TypeScript (expert), TanStack Query, React Router, React Hook Form.
28. Data visualization: Recharts/Chart.js (expert) and D3 (for custom charts).
29. State and composition patterns: Redux Toolkit or similar; atomic and compound components.
Architecture, Data & Streaming
30. Domain-Driven Design, Clean Architecture, dependency injection, and repository patterns.
31. PostgreSQL/MySQL: schema design, indexing, query tuning, and connection pooling.
32. Kafka/MSK/Kinesis: producers/consumers, partitions, and at-least-once semantics (idempotency a plus).
33. Pandas for pragmatic data manipulation in services and jobs.
Security, Quality & Governance
34. AuthN/AuthZ (OAuth2/JWT), RBAC, and secure secrets handling.
35. Data validation and governance (Great Expectations/Deequ); PII handling and encryption (nice to have).
Delivery & Operations
36. Docker, CI/CD, Git workflows; observability basics (logs, metrics, traces).
37. Database change management (Alembic; Liquibase/Flyway a plus).