SDK Engineer (Python/TypeScript)

Location: Hybrid in Germany, France, Italy, Portugal, Spain, or The Netherlands

Salary: €90,000–€160,000 per year, plus equity

Company

Rapidly scaling startup with a globally distributed workforce operating in more than 25 countries and building open-source tooling for LLM application developers.

What you will do

• Own the reliability, performance, and developer experience of Python and TypeScript SDKs built on OpenTelemetry.
• Design developer-facing APIs, interfaces, error handling, batching, asynchronous flushing, graceful degradation, versioning, and migration paths.
• Maintain and expand integrations with major AI frameworks and model providers, including OpenAI SDK, Vercel AI SDK, LangChain, LlamaIndex, Pydantic AI, OpenAI Agents, CrewAI, Amazon Bedrock AgentCore, and LiveKit.
• Maintain the OpenTelemetry endpoint, support Langfuse features across languages, and collaborate with the OpenTelemetry community on GenAI conventions.
• Write and maintain SDK documentation, integration guides, and migration documentation.
• Work independently in a small, accountable team and communicate with developers about integration challenges.

Requirements

• Strong software engineering skills and enthusiasm for developer experience, API design, and reliable production code.
• Experience building or maintaining SDKs, client libraries, or developer tools, ideally with Python and/or TypeScript.
• Deep understanding of performance, including profiling, benchmarking, and minimizing CPU and memory overhead in hot paths.
• Ability to manage projects independently and develop strong conviction about what to build and how to ship it.
• Thoughtful approach to versioning, backward compatibility, and migration paths.
• Interest in open-source software and willingness to discuss integration challenges with developers.
• Ability to thrive in a small, accountable team where output is visible and impactful.

Nice to have

• CS or quantitative degree.
• Experience with OpenTelemetry internals or observability instrumentation.
• Former founder or early-stage startup experience.
• Contributions to popular open-source SDKs or developer tools.
• ML/AI background or familiarity with the LLM framework ecosystem.

Culture & Benefits

• Flexible work environment with a remote-friendly, globally distributed company.
• Employer healthcare contributions.
• Stock options for new team members.
• Flexible time off in the US and generous entitlement in other countries.
• USD $500 home-office setup allowance for remote employees.
• Opportunities to participate in company-wide offsites and global gatherings.