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Senior Full-Stack Engineer (m/f/d)
Senior Full-Stack Engineer (m/f/d)Simon-Kucher & Partners • Cologne, DE
Senior Full-Stack Engineer (m/f/d)

Senior Full-Stack Engineer (m/f/d)

Simon-Kucher & Partners • Cologne, DE
Vor 30+ Tagen
Stellenbeschreibung

Senior Full-Stack Engineer (m/f/d)

In Germany - Berlin| Bonn | Cologne | Frankfurt/Main | Hamburg | Munich

We are seekingan experienced Senior AI Full-Stack Engineer to contribute to designing andbuilding scalable SaaS products within our AI Lab. In this role, you’ll combinedeep technical expertise with strategic vision to build AI-powered products thatwill help transform our clients’ business models and enable their growth.

Simon-Kucheris at the forefront of innovation in driving commercial excellence, revampingbusiness models, developing solutions and methodologies for unlocking bettergrowth of our clients. Within AI Lab, we are developing cutting-edge large scale AI products to deliversustained top-line impact for our clients.

Are you interested in working in a team of AI evangelists with a can-doattitude? Want to experience the dynamics of agile processes in open-mindedteams? How about getting creative in a startup atmosphere with a steepdevelopment curve and flat hierarchies? And most importantly, do you want tomake a difference? Then you've come to the right place.

What makes us special:
  • Advance your career with exciting professional opportunities in our thriving company with a startup feel
  • Innovate by transforming ideas into cutting-edge AI products, championing AI and Generative AI through creative experimentation to push boundaries and deliver transformative solutions.
  • Voice your unique ideas in a culture defined by our entrepreneurial spirit, openness, and integrity
  • Feel at home working with our helpful, enthusiastic colleagues who have great team spirit
  • Broaden your perspective with our extensive training curriculum and learning programs (e.g. LinkedIn Learning)
  • Speak your mind in our holistic feedback and development processes (e.g. 360-degree feedback)
  • Satisfy your need for adventure with our opportunities to live and work abroad in one of our many international offices
  • Enjoy our benefits, such as hybrid working, daycare allowance, corporate discounts, and wellbeing support (e.g. Headspace)
  • Unwind in our break areas where you can help yourself to the healthy snacks and beverages provided
  • See another side of your coworkers at our frequent employee events, World Meetings and Holiday Parties
How you will create an impact:
  • Build and launch multi‑tenant app modules (UI + services) with role‑based access and audit logging.
  • Implement RAG‑powered features with high UX trust signals (citations, source previews, evaluations in‑product).
  • Establish a UI design system and component library for reuse across products.
  • Ship secure and accessible UIs and services that turn data/ML/GenAI into delightful, explainable features.
  • Design and build TypeScript/React (or equivalent) front ends and service layers (Node/NestJS or Python/FastAPI).
  • Implement authN/authZ (OIDC), tenancy boundaries, rate limiting, and usage metering.
  • Integrate ML/LLM endpoints via a gateway; instrument for latency, errors, and cost; implement fallbacks.
  • Own end‑to‑end testing (contract, e2e, accessibility), CI/CD, and release automation.
  • Collaborate with Product team on technical discovery and feasibility and with UX Designer on IA/UX;
  • Influence architectural decisions and helping to shape products, not just implementing/coding them
  • Write technical documentation.
  • Work with Platform Engineer to deploy and manage services securely.
  • Mentor junior engineers
About you:
  • Proven experience with designing, developing and operating secure multi-tenant, customer-facing SaaS products used by real users at scale
  • You think with a product mindset, focusing on customer value, reliability, and speed-to-market rather than technology for its own sake.
  • Very strong communication and collaboration skills - supporting other engineers, async collaboration, explaining technical decisions to non-technical audiences, writing documentation, showing initiative.
  • You are business-oriented data-centric, passionateabout building products that deliver tangible value to our clients

Technical skills

  • API gateway patterns, versioning, idempotency, and rate limiting.
  • Async workloads: background jobs (Celery/RQ/BullMQ) + queueing; file ingestion pipelines; webhook patterns.
  • Experience integrating ML/LLM services (streaming, tool use, evals, guardrails) and building RAG features with ingestion pipelines, embeddings, vector stores, and retrieval orchestration.
  • Python (advanced); FastAPI (async/await, dependency injection,middleware); Pydantic (validation, serialization, API contracts).
  • Expert in React and TypeScript; strong component architecture and state management patterns
  • Experience building responsive, accessible (WCAG-aware) UIs using semantic HTML/CSS
  • Strong performance engineering skills (profiling, code-splitting, Core Web Vitals, render optimization)
  • Proven ability integrating with APIs (REST/GraphQL), including caching, pagination, loading/error states, and resiliency
  • Security-minded UI development (XSS prevention,auth flows, dependency hygiene)
  • Require end-to-end testing tools: Playwright/Cypress, contract testing (PACT optional), and CI quality gates.
  • Typed APIs: OpenAPI-first, schema validation, and backwards compatibility policies.
  • Docker, CI/CD, Git workflows; observability basics (logs, metrics, traces).
  • Database change management (Alembic;Liquibase/Flyway a plus).
  • Require OpenTelemetry instrumentation and experience buildingdashboards/alerts for product KPIs + technical KPIs (latency, error rate, costper request).
  • Expand authN/authZ requirements: tenant-aware RBAC, session security, secure cookie strategy, CSRF, CSP, SSRF controls for connectors, secure file upload handling.
  • Supply chain security basics (dependencyscanning, SBOMs) as a plus.
  • Hands-on with Kubernetes deployment patterns, Helm/Kustomize, andtroubleshooting in production.
  • Domain-Driven Design, Clean Architecture, dependency injection, and repository patterns.
  • PostgreSQL/MySQL: schema design, indexing, query tuning, and connection pooling.
  • Kafka/MSK/Kinesis: producers/consumers, partitions, and at-least-once semantics (idempotency a plus).
  • Pandas for pragmatic data manipulation inservices and jobs.
  • AuthN/AuthZ (OAuth2/JWT), RBAC, and secure secrets handling.
  • Data validation and governance (Great Expectations/Deequ); PII handling and encryption (nice to have).

Have we sparked your interest? Simply click the 'Apply now' button to submit your application. Please note that, for data protection reasons, we cannot accept applications via email.
Would you like to learn more about us and our company culture? Click here to watch our recruitment video.

About Simon-Kucher
Simon-Kucheris a global consultancy with more than 2,200 employees in 30+ countries. As atrusted commercial advisor focused on unlocking better growth, we combine deepconsulting expertise, growth specialization, and technology to scale lastingimpact. We optimize every lever of commercial strategy – product, pricing,innovation, marketing, and sales – based on what customers want and value. Withover 40 years of monetization experience, we are recognized as the world’sleading commercial growth and pricing specialist. simon-kucher.com

We believe in building a culture that embraces diversity, equity, and inclusion, creating an environment in which our people feel valued, are able to be themselves and feel their contribution matters. If we get that right, remarkable things will happen; people will grow faster, innovate, feel valued, and create better outcomes for everyone – our people, our clients and, of course, our business.

Your personal contact:
Maria Weininger
recruitment.germany(at)simon-kucher.com

Please submit your application exclusively via the “Apply now” button!

Better growth starts here. With you.

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Senior Full-Stack Engineer (m/f/d) • Cologne, DE

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