Owning our SDKs. We maintain SDKs in Python and TypeScript both built on OpenTelemetry. You'll be responsible for their reliability, performance, and developer experience.
Designing APIs that developers love. Developer experience is a core differentiator for Langfuse and you'll own every detail of it.
Integrating with every major AI framework: Langfuse integrates with 40+ frameworks and model providers and you'll maintain these integrations.
Maintaining our OpenTelemetry endpoint: you'll ensure this path is robust, well-documented, and supports the full range of Langfuse features.
Writing public documentation: you'll own the SDK docs, integration guides, and migration paths.

Requirements

Strong engineer who gets excited about developer experience, API design, and writing code that runs reliably in other people's production systems
Experience building or maintaining SDKs, client libraries, or developer tools — ideally in Python and/or TypeScript
Deep understanding of performance: you know how to profile, benchmark, and minimize CPU/memory overhead in hot paths
Someone who can manage projects themselves — you know how to develop strong conviction about what to build and how to ship it
Thoughtful about versioning, backwards compatibility, and migration paths
Interest in open source software and genuine excitement about talking to developers about their integration challenges
Thrives in a small, accountable team where your output is visible and matters
CS or quantitative degree preferred
*Bonus points:*
Experience with OpenTelemetry internals or observability instrumentation
Former founder or early startup experience
Contributions to popular open source SDKs or developer tools
ML/AI background or familiarity with the LLM framework ecosystem

Benefits

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Applicant Tracking System Keywords

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Hard Skills & Tools

PythonTypeScriptSDKsAPI designperformance profilingbenchmarkingCPU optimizationmemory optimizationOpenTelemetryobservability instrumentation

Soft Skills

developer experienceproject managementstrong convictionbackwards compatibilitymigration pathscommunicationteam collaborationaccountabilityproblem-solvingadaptability

Certifications

CS degreequantitative degree