X4 Engineering ยท 1 day ago
Senior Python Software Engineer
United States
Full-time
Remote
Senior Level
$150K/yr - $225K/yr
7+ years expX4 Engineering is 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, responsible for building SDKs that allow developers to connect AI agents into a multi-agent communication system.
Staffing & Recruiting
Hiring Manager
Alex Koivio
Responsibilities
Design and evolve a production-grade Python SDK used by external developers
Implement adapters for leading agent frameworks
Integrate directly with frontier model APIs
Shape emerging agent-to-agent communication standards
Focus heavily on API ergonomics, developer experience, and reliability
Qualification
Required
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
Preferred
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
Company
X4 Engineering
X4 Engineering partner with businesses across the entire engineering spectrum, from early-stage R&D to commercial enterprises to provide world-class talent solutions.
11-50 employees
Funding
Current Stage
Early StageCompany data provided by crunchbase