Senior Full Stack Engineer (LangSmith)

About LangChain

LangChain was founded in early 2023 to help developers build context-aware reasoning applications. LangChain, open source software, is a framework that gives developers the building blocks to create production-ready applications with LLMs. LangSmith is our commercial, all-in-one SaaS platform that enables the end-to-end, development workflow for building LLM-powered apps. LangSmith is now trusted by the best teams building with LLMs, at companies such as Airbnb, ByteDance, Klarna, Google, Meta, Home Depot, and our 80+ paying enterprise customers.

Backed by some of the best venture capitalists, Benchmark and Sequoia, we have 10x’d our revenue last year and have big ambitions and are set up to build an enduring business.

About the role

In person 5 days/week in San Francisco

We're looking for a Senior Full Stack Engineer who will grow into a Tech Lead role for LangSmith, our rapidly-growing commercial product. In this role, you'll have the opportunity to shape the technical direction of our platform while working closely customers and internal stakeholders.

• Lead the technical architecture and implementation of key product features for LangSmith, working across our entire Go, Python, and Typescript stack.

• Collaborate closely with product and design teams to iterate on new features.

• Mentor and guide more junior members of the team. Drive aggressive project timelines while ensuring high engineering standards are being met.

• Lead by example in writing clean, maintainable, and well-tested code

How to be successful in this role

• 7+ years of experience in software engineering

• Strong knowledge in at least one of Go or Python, strong knowledge of React + Typescript

• Strong understanding of database systems, particularly Postgres and Redis

• Experience designing and scaling APIs, preferably in a high-performance, data-intensive application

• A “get stuff done” attitude—comfortable shipping fast and iterating based on user feedback

• Strong communication skills—able to work with internal stakeholders and engage directly with customers

• Strong ownership mindset

• Bonus: Experience with AI/LLM-powered applications, developer tools, or observability platforms

Compensation & Benefits

• Competitive salary and equity stake for role and stage of company. Commensurate with experience.

• Annual salary range: $165,000-$195,000 USD for Senior Engineers