Skills & Technologies
Requirements
- Experience
- 7+ years
Benefits
Joblaze summary
The Senior Fullstack Engineer at LangChain plays a pivotal role in shaping the LangSmith observability and evaluation platform, focusing on the technical architecture and implementation of key features. This position requires proficiency in Go, Python, and Typescript, along with a solid understanding of database systems like Postgres and Redis. Ideal candidates have over five years of experience in software engineering, particularly with complex platform products, and possess strong communication skills for collaboration with both internal teams and enterprise customers. LangChain is in a growth phase, emphasizing impactful contributions from all team members.
Joblaze insights
- Listed about a month ago on Joblaze — tracked directly from LangChain's career page.
- LangChain has 101 other open roles including Enterprise Account Executive (Minneapolis), Web Lead, Commercial Sales Director - East.
- 2358 active Python roles on Joblaze right now.
- 712 active Go roles on Joblaze right now.
- 501 active TypeScript roles on Joblaze right now.
- Salary band is in line with the typical range for Fullstack (median ~$163,550).
Quick facts
- Is the Senior Fullstack Engineer, AI Observability & Evals Platform role remote?
- No — this is an on-site role in San Francisco, CA.
- What's the salary range?
- LangChain lists $175,000–$225,000 for this role.
- How much experience is required?
- At least 7 years of relevant experience for this Senior Fullstack Engineer, AI Observability & Evals Platform role.
- Where is the role based?
- LangChain is hiring for this position in San Francisco, CA.
- What's the tech stack?
- Joblaze extracted these technologies from the posting: TypeScript, Go, React, Python, PostgreSQL, Redis.
- What seniority level is this role?
- LangChain targets senior candidates for this position.
- Is this full-time or contract?
- Full-time for this Senior Fullstack Engineer, AI Observability & Evals Platform role at LangChain.
From the original posting
About Us
At LangChain, 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.
With $125M raised at Series B from IVP, Sequoia, Benchmark, CapitalG, 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. LangChain is a place where your contributions can shape how this technology shows up in the real world.
Today, our platform includes LangSmith (Observability, Evaluation, Deployment, Fleet, and Sandboxes), our open source frameworks (LangChain, LangGraph, and Deep Agents), and the newly launched LangSmith Engine for autonomous agent improvement. We have 100M+ monthly open source downloads, 6,000+ active LangSmith customers, and 5 of the Fortune 10 use LangSmith in production (+ 35% of the Fortune 500 overall), including teams at Klarna, Clay, Coinbase, Workday, Lyft, Cloudflare, Harvey, Rippling, Vanta, LinkedIn, Monday.com, Nvidia, and Bridgewater.
About Us:
About the role
In person 5 days/week in San Francisco
We're looking for a Senior Fullstack Engineer for our commercial product LangSmith, an observability and evals platform. In this role, you'll have the opportunity to shape the technical direction of our platform while working closely with enterprise customers, developer end-users and internal stakeholders.
What You Will Do
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
What You Bring
5+ years of experience in software engineering working on complex platform products
Fullstack engineering experience with Go or Python on the backend and React + Typescript on the frontend.
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 communicator with the ability to collaborate closely with various internal stakeholders and engage directly with our top-tier customers
Strong ownership mindset
Bonus: Experience with AI/LLM-powered applications, developer tools, or observability platforms
Compensation
Annual salary range: $175,000-$240,000 USD
Compensation Philosophy:
We offer competitive compensation that includes base salary, variable compensation for relevant roles, meaningful equity, benefits, and perks. Actual compensation and offerings will vary based on role, level, and location. Team members in the EU, UK, and APAC receive locally competitive benefits aligned with regional norms and regulations.
Benefits
Benefits include medical, dental, and vision coverage, flexible vacation, a 401(k) plan, meals on in-office days in the US and more.