Senior Fullstack Engineer, AI Observability & Evals Platform

LangChain, Inc

$175K — $240K *
Enterprise Technology
5 - 7 years of experience
Job Overview by Ladders

Qualifications

  • 5+ years of experience in software engineering with complex platform products
  • Proficiency in fullstack development using Go/Python for backend and React/Typescript for frontend
  • Strong expertise in database systems like Postgres and Redis
  • Experience in designing and scaling APIs for high-performance applications
  • Proactive 'get stuff done' attitude with quick iteration based on feedback
  • Strong communication skills with ability to work with diverse stakeholders
  • Ownership mindset in driving project success
  • Bonus: Experience with AI/LLM applications or observability tools

Responsibilities

  • Lead technical architecture and implementation of LangSmith features
  • Collaborate with product and design teams for new feature iterations
  • Mentor and guide junior team members
  • Drive project timelines while upholding engineering standards
  • Write clean, maintainable, and well-tested code

Benefits

  • Medical, dental, and vision coverage
  • Flexible vacation policy
  • 401(k) plan
  • Meals provided on in-office days in the US
  • Additional benefits based on location
Full Job Description


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 experiencein 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.

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