Product Engineer (Growth)

About LangfuseOpen Source LLM Engineering Platform that helps teams build useful AI applications via tracing, evaluation, and prompt management (mission, product). We are now part of ClickHouse.We're building the "Datadog" of this category; model capabilities continue to improve, but building useful applications is really hard, both in startups and enterprises.Largest open source solution in this category: trusted by 19 of the Fortune 50, >2k customers, >26M monthly SDK downloads, >6M Docker pulls.We joined ClickHouse in January 2026 because LLM observability is fundamentally a data problem and Langfuse already ran on ClickHouse. Together we can move faster on product while staying true to open source and self-hosting, and join forces on GTM and sales to accelerate revenue.Previously backed by Y Combinator, Lightspeed, and General Catalyst.We're a small, engineering-heavy, and experienced team in Berlin and San Francisco. We are also hiring for engineering in EU timezones and expect one week per month in our Berlin office (how we work).Why Growth Engineering at LangfuseYour work will have an outsized impact. Langfuse is growing on an exponential curve while we are adding more users. Our existing users also increase their token use and build more LLM based applications and features.We sit at the center and enable our users to build LLM applications faster, more reliably and safer.It’s your chance to jump on the curve and increase its slope directly through any wild ideas you have. Be at the forefront of agentic development and show the world how to use Langfuse to develop even faster.Maybe you believe the future users of Langfuse will be agents and most growth stems from them? Amazing - run an experiment to validate this hypothesis.You have real data to work with in terms of analytics and users who are the most agile and up-to-date developers building out AI applications - the perfect environment to try big bets and shape them to success. All while learning how the best agentic applications are built.Your impactYour work directly impacts our most important growth metrics:Top of Funnel: More customers want to try LangfuseActivation: Customers see faster time to valueAdoption: More customers adopt all features across our product suiteCustomers require less handholding because the product explains it allExpansion: help customers expand from one product area to all of our offeringWhat you’ll do1) Understand how customers use LangfuseYou build and maintain our data stack (Posthog, BigQuery, DBT, Metabase) to generate insights into user behaviorMap our core funnel for each feature and make it easy to monitor (we are using posthog for this)You are the advocate within the team for how customers actually adopt/use our product2) Make our product our #1 growth engineShip constant improvements that reduce onboarding friction for usersExperiment with changes to signup flowsCollaborate with feature focused Product Engineers and DesignersBuild loops to help customer expand into all of our product areas3) Build new growth enginesExperiment with loops that make people tweet about langfuse (like langfuse wrapped but better)Experiment with features that turn our customers accounts into user generated content (e.g.. let customers share their prompts in langfuse in a public prompt library)Jump on hot topics to integrate into Langfuse (e.g. ship an OpenClaw integration) and write about itWhat we’re looking forMust-havesDrive to learn fresh things - you experiment on many different topics and come up with ideasA hang for business - you envision how Langfuse succeeds through product lead growthExperience in full-stack development - you can ship changes that touch FE and BE in our product with confidence (frontend overhang and collaborate on backend)SQL skills (for analytics)You are excited to talk to and think like our usersNice-to-havesExperience with devtools / OSS ecosystems and developer-centric go to marketTaste for UX / Design big plusFamiliarit ... (truncated, view full listing at source)