FullStack Engineer, AI Observability & Evals Platform (LangSmith)

LangChain, Inc

$145K — $180K *
Enterprise Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • 2+ years of software engineering experience on complex platform products
  • Proficiency in fullstack engineering with Go or Python (backend) and React + Typescript (frontend)
  • Understanding of database systems, especially Postgres and Redis
  • Experience designing and scaling APIs for data-intensive applications
  • Strong communication skills for collaboration with internal teams and client interactions
  • Ownership mindset and ability to drive initiatives
  • Bonus: Familiarity with AI/LLM applications, developer tools, or observability platforms

Responsibilities

  • Develop and implement key features for the LangSmith platform
  • Collaborate with product and design teams to enhance product features
  • Ensure high engineering standards while meeting project deadlines
  • Write clean, maintainable, and well-tested code
  • Engage with enterprise customers to gather feedback and iterate on solutions
  • Drive the product roadmap in alignment with user needs
  • Work across a technology stack including Go, Python, and Typescript

Benefits

  • Annual performance reviews to discuss professional growth
  • Opportunities for career advancement in a rapidly growing company
  • Flexible work environment with a commitment to work-life balance
  • Access to cutting-edge technology and tools to support development
  • Collaborative and innovative team culture focused on breakthrough solutions
Full Job Description
About the role

We're looking for a Fullstack Engineer to work on LangSmith, our commercial AI observability and evals platform product. In this role, you'll have the opportunity to build new features and functionality for the platform while working close enterprise customers, developer end-users and internal stakeholders.
What you will do
  • Develop and implement key product features working across our entire Go, Python, and Typescript stack
  • Collaborate closely with product and design teams to iterate on new features and enhance the product roadmap
  • Drive aggressive project timelines while ensuring high engineering standards are being met by writing clean, maintainable, and well-tested code


How to be successful in this role
  • 2+ 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
  • Solid understanding of database systems, particularly Postgres and Redis
  • Experience designing and scaling APIs, preferably in high-performance, data-intensive applications
  • Strong ownership and a "get stuff done" mindset - 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
  • Bonus: Experience with AI/LLM-powered applications, developer tools, or observability platforms


Compensation
Annual salary range: $145,000-180,000 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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