Senior Python Software Engineer

Senior Python Software Engineer – AI Integrations

Industry:

AI / Developer Platforms / Distributed Systems Location:

UK / Europe - Fully Remote Salary:

Competitive Base + Equity / Bonus Potential

X4 Engineering are working with a highly innovative, early-stage AI platform company that is building the connective tissue for the next generation of AI systems.

They are seeking a Senior Python Software Engineer to take ownership of their developer-facing integration layer. This role sits at the heart of the platform, responsible for building the SDKs that allow developers to connect AI agents into a multi-agent communication system in minutes rather than weeks.

In this role, you will design and evolve a production-grade Python SDK used by external developers, implementing adapters for leading agent frameworks, integrating directly with frontier model APIs, and shaping emerging agent-to-agent communication standards. You’ll focus heavily on API ergonomics, developer experience, and reliability, while working on genuinely bleeding-edge problems where protocols and best practices are still being defined.

Key Requirements 7+ years of professional Python experience with strong OOP fundamentals Deep experience with asyncio, type hints, and Pydantic Proven background building and maintaining SDKs, libraries, or developer tools used by external teams Familiarity with AI / LLM frameworks such as LangChain, LangGraph, Pydantic AI, AutoGen, or similar Strong API design instincts with a focus on usability and developer experience Experience designing and consuming REST and WebSocket APIs

Nice to Have Exposure to agent-to-agent protocols (A2A, MCP, ACP) or distributed messaging standards Multi-language experience (TypeScript, Go, Rust, Elixir) Contributions to open-source AI or developer tooling projects Startup or early-stage experience, comfortable operating with ambiguity and speed

If you’re interested in exploring this opportunity, please get in touch at

or apply directly via the job advert.