Senior Fullstack Software Engineer, AI Observability & Evals Platform (NY)
- Pay
- $175,000 – $240,000 per year
- Location
- San Francisco, CA
- Job type
- Full-time
- Level
- Director
- Experience
- 5+ years
- Listed
- 23 days ago
Skills & highlights for this role
- Go
- Python
- TypeScript
- React
- PostgreSQL
- Redis
Also useful
- LLM applications
- observability platforms
- developer tools
Stated benefits & perks
- Medical
- Dental
- Vision
- 401k
- Flexible vacation
About the Role
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
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.
We are hiring for this role across a range of scope, and the compensation band reflects that. Your offer depends on what we learn about your impact, craft, leadership, and communication during the interview process. We will tell you early where you’re tracking and talk comp with you before offer stage. 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.
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.
From LangChain's careers page, first listed on Rolev.ai on October 17, 2026. Rolev.ai is not the employer.
How Rolev.ai helps with this application
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Common questions
What is the salary for the Senior Fullstack Software Engineer, AI Observability & Evals Platform (NY) role at LangChain?
The Senior Fullstack Software Engineer, AI Observability & Evals Platform (NY) posting at LangChain states compensation of $175,000 – $240,000 per year. It is listed as a full-time position. Final pay may depend on location, experience, and interview evaluation on LangChain's official career site.
Where is the Senior Fullstack Software Engineer, AI Observability & Evals Platform (NY) job at LangChain located?
This Senior Fullstack Software Engineer, AI Observability & Evals Platform (NY) position at LangChain is located in San Francisco, CA. Always check LangChain's application page for specific state eligibility or relocation policies.
What qualifications are required for Senior Fullstack Software Engineer, AI Observability & Evals Platform (NY) at LangChain?
For the Senior Fullstack Software Engineer, AI Observability & Evals Platform (NY) role, LangChain highlights 5+ years of relevant experience; experience with Go, Python, TypeScript, React, PostgreSQL, Redis. Rolev.ai can score your existing resume against these requirements and show any skill gaps before you apply.
How do I apply for the Senior Fullstack Software Engineer, AI Observability & Evals Platform (NY) position at LangChain?
This listing links directly to LangChain's Ashby application page. You can apply directly on LangChain's site, or use Rolev.ai to check your resume fit, generate a zero-hallucination tailored resume and cover letter for this posting, and autofill the Ashby application form in 1 click with the Rolev.ai Chrome extension. You always review the form and press Submit yourself.