{"id":2864581,"url":"https://alion.io/job/clickhouse-langfuse-senior-software-engineer-sdk","title":"Langfuse - Senior Software Engineer, SDK","company":{"id":3448,"name":"ClickHouse","domain":"clickhouse.com","url":"https://alion.io/company/clickhouse","size_band":"501-1000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":79,"open_postings":40,"ghost_share":0,"stale_share":0.65,"repost_share":0,"time_to_fill_p50_days":68,"computed_at":"2026-10-22T06:10:10Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Portugal","France","Spain","Italy","Netherlands"],"countries":["PT","FR","ES","IT","NL"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":90000,"max":160000,"currency":"EUR","period":"year","gross":null,"usd_annual":179702},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"AWS Bedrock AgentCore","optional":false},{"name":"CrewAI","optional":false},{"name":"GitHub","optional":false},{"name":"Go","optional":false},{"name":"Java","optional":false},{"name":"LangChain","optional":false},{"name":"Langfuse","optional":false},{"name":"LiveKit","optional":false},{"name":"LlamaIndex","optional":false},{"name":"LLM","optional":false},{"name":"OpenAI","optional":false},{"name":"OpenAI SDK","optional":false},{"name":"OpenTelemetry","optional":false},{"name":"Pydantic AI","optional":false},{"name":"Python","optional":false},{"name":"TypeScript","optional":false},{"name":"Vercel AI SDK","optional":false},{"name":"ClickHouse","optional":true}],"status":"live","first_seen_at":"2026-10-19T16:53:20Z","employer_posted_date":"2026-10-19","last_verified_at":"2026-10-23T01:23:35Z","board_verified":true,"closed_at":null,"days_open":3,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":3},"description":"Why SDK Engineering at Langfuse\nYour work will have an outsized impact.\nOur SDKs are downloaded 26M+ times per month. When you ship a new integration or improve SDK performance, thousands of developers benefit the same day - and they'll tell you about it in GitHub issues, on Twitter, and in our community channels. Everything you build is open source (MIT-licensed) and immediately visible.\nThe SDK is often the very first thing a developer touches when they try Langfuse, so your work directly shapes their first impression.\nYou will also have direct exposure to how cutting-edge LLM-applications are built. The users you serve are some of the best and most ambitious software engineers in the world and that leverage Langfuse to improve their applications. Deeply understanding the problems they solve will help you design the best possible SDK experience and along the way makes you an expert on LLM engineering yourself.\nYou will grow at Langfuse by\nOwning 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.\n\nDesigning 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.\n\nIntegrating 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.\n\nMaintaining 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.\n\nWriting 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.\n\nWhat we're looking for\nStrong engineer who gets excited about developer experience, API design, and writing code that runs reliably in other people's production systems\n\nExperience building or maintaining SDKs, client libraries, or developer tools - ideally in Python and/or TypeScript\n\nDeep understanding of performance: you know how to profile, benchmark, and minimize CPU/memory overhead in hot paths\n\nSomeone who can manage projects themselves - you know how to develop strong conviction about what to build and how to ship it\n\nThoughtful about versioning, backwards compatibility, and migration paths\n\nInterest in open source software and genuine excitement about talking to developers about their integration challenges\n\nThrives in a small, accountable team where your output is visible and matters\n\nCS or quantitative degree preferred\n\nBonus points:\nExperience with OpenTelemetry internals or observability instrumentation\n\nFormer founder or early startup experience\n\nContributions to popular open source SDKs or developer tools\n\nML/AI background or familiarity with the LLM framework ecosystem\n\nNo candidate checks all boxes. If you feel you are a good fit for this role, please go ahead and apply.\nLearn more about\nSDK Overview - architecture and design of our Python and TypeScript SDKs\n\nAll Integrations - the full list of frameworks, model providers, and gateways we support\n\nOpenTelemetry Integration - how we use OTEL as the foundation\n\nSDK Upgrade Paths - how we think about versioning and breaking changes\n\nProject you could have built: TypeScript SDK v4 (GA)\n\nProject you could have built: Python SDK v3 (GA)\n\nOur codebase: GitHub Repository\n\nBen Kuhn on Impact, Agency and Taste\n\nWho we are & how we work\n\nPerks\nFlexible work environment - ClickHouse is a globally distributed company and remote-friendly. We currently operate in over 25 countries.\n\nHealthcare - Employer contributions towards your healthcare.\n\nEquity in the company - Every new team member who joins our company receives stock options.\n\nTime off - Flexible time off in the US, generous entitlement in other countries.\n\nA USD$500 Home office setup if you’re a remote employee.\n\nGlobal Gatherings - We believe in the power of in-person connection and offer opportunities to engage with colleagues at company-wide offsites.\n\nCulture - We All Shape It\nAs part of a rapidly scaling start-up, you will be instrumental in shaping our culture.\nAre you interested in finding out more about our culture? Learn more about our values here. Check out ourblog posts or follow us on LinkedIn to find out more about what’s happening at ClickHouse.\nEqual Opportunity & Privacy\nClickHouse provides equal employment opportunities to all employees and applicants and prohibits discrimination and harassment of any type based on factors such as race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.\nPlease see here for our Privacy Statement.","description_format":"text","description_chars":6222,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity","Flexible schedule","Flexible time off","Home office","Stock options"],"hiring_locations":[{"name":"Germany","iso":"DE","kind":"country"},{"name":"France","iso":"FR","kind":"country"},{"name":"Italy","iso":"IT","kind":"country"},{"name":"Netherlands","iso":"NL","kind":"country"},{"name":"Spain","iso":"ES","kind":"country"},{"name":"Portugal","iso":"PT","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Data Warehouses & Lakehouses","Databases & DBMS"],"lifecycle":[{"event":"open","at":"2026-10-19T17:20:48Z"}],"visa":[],"liveness":{"score":63,"band":"ok","label":"Likely open","p_open":1,"p_active":0.632,"p_room":1,"age_days":2,"expected_fill_days":68,"reasons":["conf:2","stale_co","velocity","win:early","comp:brand"],"computed_at":"2026-10-22T06:10:10Z"},"pay":{"stated_usd_annual":179702,"is_top_pay":true},"html_url":"https://alion.io/job/clickhouse-langfuse-senior-software-engineer-sdk","json_url":"https://alion.io/job/clickhouse-langfuse-senior-software-engineer-sdk.json","meta":{"generated_at":"2026-10-23T03:40:57Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":6047,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-24T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":3448},"rest":"https://alion.io/mcp/rest/get_company?id=3448"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fclickhouse-langfuse-senior-software-engineer-sdk"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fclickhouse-langfuse-senior-software-engineer-sdk"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fclickhouse-langfuse-senior-software-engineer-sdk"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/clickhouse-langfuse-senior-software-engineer-sdk\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fclickhouse-langfuse-senior-software-engineer-sdk"}]}