
We're on a mission to make it easy to build the LLM apps of tomorrow, today. We build products that enable developers to go from an idea to working code in an afternoon and in the hands of users in days or weeks. We’re humbled to support 100k+ companies who choose to build with LangChain. And we built LangSmith to support all stages of the AI engineering lifecycle, to get applications into production faster.

We're on a mission to make it easy to build the LLM apps of tomorrow, today. We build products that enable developers to go from an idea to working code in an afternoon and in the hands of users in days or weeks. We’re humbled to support 100k+ companies who choose to build with LangChain. And we built LangSmith to support all stages of the AI engineering lifecycle, to get applications into production faster.
Core offering: Open-source LLM agent framework plus commercial platform for agent orchestration, observability, evaluation, and deployment
Founders / leadership: Co-founded by Harrison Chase (CEO) and Ankush Gola
Adoption metrics (site-stated): Claims: 90M monthly downloads, 100k+ GitHub stars, 1,000+ integrations; used by 100k+ companies
Recent funding: $125M Series B (2025) led by IVP; prior seed and Series A led by Benchmark and Sequoia
Employees (approx.): ~215
| Company |
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Agent engineering and productionization of LLM-powered applications
2022
Technology, Information and Internet
$10M
$25M
$125M
Reported valuation around $1.25B
“Participation from top-tier VCs (Benchmark, Sequoia, IVP) and corporate investors in later round (e.g., CapitalG, Sapphire Ventures, Workday Ventures, ServiceNow Ventures, Datadog, Databricks Ventures, Cisco Investments)”
About LangChain At LangChain, our mission is to make intelligent agents ubiquitous. We provide the agent engineering platform and open source frameworks developers need to ship reliable agents fast.
Our open source frameworks, LangChain and LangGraph, see over 90+ million downloads per month and help developers build agents with speed and granular control. LangSmith offers observability, evaluation, and deployment for rapid iteration, enabling teams to transform LLM systems into dependable production experiences.
LangChain is trusted by millions of developers worldwide and powers AI teams at companies like Replit, Clay, Cloudflare, Harvey, Rippling, Vanta, Workday, and more.
About the role:
We are seeking a skilled software engineer to join our platform team, focusing on the development and maintenance of LangSmith’s SDKs in various programming languages with a focus on Typescript, Python, Java and Go. This role is critical in enabling developers and businesses to seamlessly interact programmatically with LangSmith and future products. The ideal candidate will have a strong background in software development, API and interface design, and cross-language SDK development.
What you will do:
About you:
Compensation: We offer competitive compensation that includes base salary, meaningful equity, and benefits such as health and dental coverage, flexible vacation, a 401(k) plan, and life insurance. Actual compensation will vary based on role, level, and location. For team members in the EU and UK, we provide locally competitive benefits aligned with regional norms and regulations. Salary Range: $170,000 - $195,000