Senior Software Engineer, SDK

🕒 March 18

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Langfuse

WebsiteLinkedInAll Job Openings

1 - 10 employees

Founded 2022

🤖 Artificial Intelligence

☁️ SaaS

🔌 API

💰 $4M Seed Round - Langfuse on 2023-11

Artificial Intelligence • SaaS • API

Langfuse is an open-source LLM engineering platform that provides observability, tracing, prompt management, evaluation, and metrics for large language model applications. It offers hosted SaaS and self-hosting options, SDKs (Python, JS/TS), integrations with OpenTelemetry and many LLM/agent libraries and providers, and APIs to capture traces, debug failures, track prompts, run evaluations, and analyze costs and latency. Langfuse targets engineering and data teams building production LLM apps and emphasizes security and enterprise compliance (SOC 2, ISO 27001, HIPAA).

📋 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. • 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

• Equity