Principal Site Reliability Engineer

Commerce Tools
Berlin, London
Workplace: HybridFull timeFunction: Communications, PR & CommunitySkills: ["Creative problem-solving","Systems thinking","Problem-solving","Teamwork","Collaboration","Mindset"]

Own AI capabilities end-to-end by building agent loops, orchestration, and robust integrations that let agents securely call backend systems and business APIs. Translate model outputs into streamed, accessible generative UI experiences and ground models in real data using retrieval, embeddings, and feedback loops. Treat evals as a first-class system and take capabilities from prototype to guard-railed production features.

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FursaFursa
Commerce Tools
Commerce Tools
1 month ago

Principal Site Reliability Engineer

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 4 hours agoStatus: Live
Reposted: similar role first listed 1 month ago

Job Summary

Own AI capabilities end-to-end by building agent loops, orchestration, and robust integrations that let agents securely call backend systems and business APIs. Translate model outputs into streamed, accessible generative UI experiences and ground models in real data using retrieval, embeddings, and feedback loops. Treat evals as a first-class system and take capabilities from prototype to guard-railed production features.
Location: Berlin, London
Workplace: Hybrid
Employment Type: Full time
Job Function: Communications, PR & Community

Key Responsibilities

  • •Build agent loops and orchestration, including tool use, structured outputs, business-rule enforcement, and graceful failure.
  • •Develop an integration layer via MCP so agents can securely call backend systems and business APIs.
  • •Render model output into live, streamed, accessible UI using generative-UI protocols.
  • •Ground models in real data with retrieval, embeddings, and feedback loops that close the learning loop.
  • •Treat evals as a first-class system and ship production features from prototype to guard-railed deployment.

Pay and Benefits

Perks:Health InsuranceLearning BudgetParental LeaveEquity

Key Requirements

  • •Shipped full-stack apps to production and owned them end-to-end across frontend, backend, deploy, and operations.
  • •5+ years shipping production software and 2+ building with LLMs in production (real users, not demos).
  • •Hands-on experience with UI protocols such as A2UI, AG-UI, MCP-UI (or similar) for generative/agent-driven UI.
  • •Experience with prompt/context engineering, agents, tool use, structured outputs, evals, MCP Python, and TypeScript/Node + React, including async, streaming, and observability.
  • •Fluency with retrieval/embeddings and SQL.
Skills:Creative problem-solvingSystems thinkingProblem-solvingTeamworkCollaborationMindset
Tech Stack:LLMsAIMCPMCP-UIA2UIAG-UIPythonTypeScriptNodeReactSQLEmbeddingsRetrievalStreamingObservabilityStructured outputsTool useAgents

Company Brief

Commerce Tools
Provides a frontend-as-a-service platform for headless commerce, enabling teams to build, deploy, and manage composable storefronts. Integrates with commercetools and other backend services to deliver omnichannel customer experiences.
Industry: SaaS
Company Size: Medium (51 to 250 employees)
Growth: Growth Stage Startup
Headquarters: Berlin, Germany
WebsiteLinkedIn