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# Langfuse - Senior Software Engineer, SDK

- **Company:** Clickhouse
- **Location:** Germany (Remote available)
- **Experience:** Expert
- **Salary:** €90,000 - €160,000
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Artificial Intelligence, Programming Tools, Fault Tolerance, Github, Python (Programming Language), Online Transaction Processing, Open Source Technology, OpenAI, Next.js, Systems Integration, TypeScript, Management of Software Versions, Large Language Models, Llamaindex, AgentCore, Langfuse — LLM Observability and Analytics Platform, Amazon Bedrock, CrewAI, Free and Open-Source Software, Vertica, Api Design, Software Coding, Serverless Computing
- **Published:** October 19, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=26707689f20270bd

## About the Role

* 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

No candidate checks all boxes. If you feel you are a good fit for this role, please go ahead and apply.

## Description

* 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. These SDKs run inside our users' production systems, which means they must never fail, must have minimal impact on CPU and memory, and must work flawlessly across every environment - from serverless functions to long-running agent loops. You'll think deeply about the exposed interfaces, error handling, batching, async flushing, and graceful degradation.
 * Designing APIs that developers love. How are functions named, how are parameters structured, how are breaking changes communicated, how does the documentation read? Developer experience is a core differentiator for Langfuse and you'll own every detail of it. When we shipped the Python SDK v3 and TypeScript SDK v4, both were full rewrites on OpenTelemetry - that's the kind of thoughtful, high-impact SDK work you'll lead. Apart from tracing, we also support core workflows of engineers building with LLMs with our SDKs, see our Experiment Runner SDK for example.
 * Integrating with every major AI framework: Langfuse integrates with 40+ frameworks and model providers: OpenAI SDK, Vercel AI SDK, AI SDK, LangChain, LlamaIndex, Pydantic AI, OpenAI Agents, CrewAI, Amazon Bedrock AgentCore, LiveKit, and many more. You'll maintain these integrations, ensure new Langfuse features are supported across all of them, and add new integrations as the ecosystem evolves. When a new framework gains traction, you'll be among the first to instrument it.
 * Maintaining our OpenTelemetry endpoint: some users send traces directly to our OTLP endpoint instead of using our SDKs. You'll ensure this path is robust, well-documented, and supports the full range of Langfuse features. This also extends our language support to Java, Go, and any language with an OpenTelemetry SDK. You can work with the OpenTelemetry community to steer the GenAI conventions.
 * Writing public documentation: you'll own the SDK docs, integration guides, and migration paths. At Langfuse, docs are part of our core product. When you ship a new SDK version or integration, the docs ship with it., * SDK Overview - architecture and design of our Python and TypeScript SDKs
 * All Integrations - the full list of frameworks, model providers, and gateways we support
 * OpenTelemetry Integration - how we use OTEL as the foundation
 * SDK Upgrade Paths - how we think about versioning and breaking changes

 * Project you could have built: TypeScript SDK v4 (GA)
 * Project you could have built: Python SDK v3 (GA)
 * Our codebase: GitHub Repository
 * Ben Kuhn on Impact, Agency and Taste
 * Who we are & how we work