commercetools - Principal Engineer, Resilience

London, England, United Kingdom (Hybrid) - Hybrid+ Equity1mo ago

In Office Principal EMEA Artificial Intelligence E-commerce Principal Engineer REST Python React TypeScript Full Stack SQL E-commerce Render Close

Requirements

• Shipped full-stack apps to production and owned them end-to-end: frontend through backend to deploy and operate, not handed off at a layer boundary • 5+ years shipping production software, 2+ building with LLMs in production (real users, not demos) • Hands-on experience with UI protocols (A2UI, AG-UI, MCP-UI, or similar). You've built against a generative/agent-driven UI protocol, not just consumed a REST API • The AI spine: prompt/context engineering, agents, tool use, structured outputs, evals, MCP Python and TypeScript/Node + React; comfortable with async, streaming, and observability • Working fluency with retrieval/embeddings and SQL • Fine-tuning/distillation, e-commerce or marketplace systems, and a track record in 0→1

Responsibilities

• Build agent loops and orchestration: tool use, structured outputs, business-rule enforcement, graceful failure • Build the integration layer (via MCP) that lets agents securely call backend systems and business APIs • Render model output into live, streamed, accessible UI via generative-UI protocols • Ground models in real data: retrieval, embeddings, and feedback loops that actually close • Treat evals as a first-class system - provable improvement, not vibes • Take a capability from prompt-in-a-notebook to a measured, guard-railed production feature • This role is to based in our hubs - Berlin, Boston, Durham, Munich, London or Valencia. • Berlin, Boston, Durham, Munich, London or Valencia • What Sets You Apart • You're a creative problem-solver who is wired to find solutions. You confidently dive into complex challenges and have a talent for making them simple for others. Your curiosity drives you to constantly grow and contribute to an environment of trust and teamwork. Great ideas come from many paths, and your unique perspective matters more than checking every box. What matters most is the mindset you bring to the work.

Benefits

• Because work and life are connected, our benefits are too. We’ve designed them to give you the security, flexibility, and opportunities you need to focus on what matters most. • 🩺 Comprehensive health benefits for you and your dependents, including access to OpenUp for personalized mental health support • 📚 Learning and development opportunities including an annual learning budget, access to self-paced learning platforms and language training, personalized coaching, mentorship, and leadership programs • Learning and development • 🍼 Family Leave Plus gives you additional fully paid weeks of parental leave on top of government-provided leave, so you can spend more time with your new addition • Family Leave Plus • 📈 Our equity participation program allows you to share in our success • Our equity participation program • For more information on our benefits, visit this page. • Come as you are. Build with us. • Your unique perspective is essential to our success. We are committed to building a team that reflects the world around us because we know it’s the only way to build the future. We celebrate our differences and have created a hiring process that’s fair, inclusive, and designed to let your talent shine.