Senior Fullstack Engineer, AI Observability & Evals Platform

LangChain, Inc

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

Qualifications

  • 5+ years of experience in software engineering on complex platform products
  • Fullstack engineering expertise with Go or Python on backend and React + Typescript on frontend
  • Strong knowledge of database systems, especially Postgres and Redis
  • Experience in designing and scaling performance-driven APIs
  • Excellent communication skills for cross-team collaboration and customer engagement
  • Ownership mindset with a proactive approach to problem solving
  • Bonus: Familiarity with AI/LLM applications or developer tools

Responsibilities

  • Lead technical architecture and feature implementation for LangSmith across the entire stack
  • Collaborate with product and design teams to refine and launch new features
  • Drive project timelines while upholding high engineering standards
  • Write clean, maintainable, and well-tested code for the product
  • Engage with enterprise customers to gather feedback and iterate on features

Benefits

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


This role is onsite 5 days/week in Boston, MA

We're looking for a Senior Fullstack Engineer to work on LangSmith. In this role, you'll have the opportunity to shape the technical direction of our platform while working closely with our enterprise customers, developer end-users, and cross functional 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.
  • Help 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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