Python OSS Engineer

About Us

At Lang Chain, our mission is to make intelligent agents ubiquitous. We build the foundation for agent engineering in the real world, helping developers move from prototypes to production-ready AI agents that teams can rely on. We began as widely adopted open-source tools and have grown to also offer a platform for building, evaluating, deploying, and operating agents at scale.

Today,
Lang Chain, Lang Graph, Lang Smith, and Agent Builder are used by teams shipping real AI products across startups and large enterprises. Millions of developers trust Lang Chain to power AI teams at companies like Replit, Clay, Coinbase, Workday, Lyft, Cloudflare, Harvey, Rippling, Vanta, and 35% of the Fortune 500
.

With $125M raised at Series B from IVP, Sequoia, Benchmark, Capital

G, and Sapphire Ventures
, we’re at a stage where we’re continuing to develop new products, growth is accelerating, and all team members have meaningful impact on what we build and how we work together. Lang Chain is a place where your contributions can shape how this technology shows up in the real world.

The Python Open Source team maintains and evolves the core Lang Chain Python ecosystem used by millions of developers worldwide. We focus on building reliable, well-designed abstractions for developing AI agents and integrating them with real-world tools and systems. The team works closely with the open-source community, incorporating feedback and contributions while ensuring the core libraries remain stable, scalable, and production-ready.

Our work defines the developer experience for building AI applications with Python.

In person 5 days/week in San Francisco, CA or Boston, MA (SF preferred).

We’re looking to add a core maintainer to the Lang Chain team. This person would be responsible for maintaining and improving the Lang Chain Python package.

• Improving the core abstractions and runtime of the langchain and langgraph packages
• Improving documentation
• Answering user questions and resolving issues
• Use langchain to build example applications

• Improve the core abstractions and runtime of the Lang Chain and Lang Graph packages
• Improve documentation across the Lang Chain ecosystem
• Answer user questions and resolve issues from the community
• Use Lang Chain to build example applications that demonstrate how to build production AI systems

• 5+ years of software engineering or applied machine learning experience
• Strong written and oral communication skills, with the ability to explain technical concepts clearly and concisely to both technical and non-technical stakeholders
• The ability to thrive in a fast-moving environment and view unstructured environments as an opportunity to identify impactful work and define the future success of the company
• An ownership-minded approach to work, with the ability to manage your work efficiently and effectively without the need for close supervision

• 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 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.
• Annual salary range: $160,000- $225,000