FullStack Engineer, AI Observability & Evals Platform (LangSmith)

LangChain; New York (NY); On-site; USD 145,000 - 180,000; Full time

Benefits offered by this job

Medical, dental, and vision coverage

Flexible vacation

401(k) plan

In-office meals on workdays

Job summary

LangChain is seeking a Fullstack Engineer for its AI observability and evals platform, LangSmith. This role involves developing key product features using Go, Python, and Typescript. Successful candidates will have 2+ years of software engineering experience, particularly in complex platform products, and should excel in collaborating with internal teams and customers. The compensation ranges from $145,000 to $180,000 annually, along with benefits including medical coverage, flexible vacation, and 401(k).

Qualifications

• 2+ years of experience in software engineering with complex platform products.
• Experience with Go or Python on the backend and React + Typescript on the frontend.
• Solid understanding of database systems, especially Postgres and Redis.
• Experience designing and scaling APIs in high-performance applications.

Responsibilities

• Develop and implement key product features across the entire tech stack.
• Collaborate closely with product and design teams for feature enhancement.
• Ensure high engineering standards and write clean, maintainable code.

Skills

Software engineering

Fullstack experience with Go/Python

React and Typescript

Database systems (Postgres, Redis)

API design and scaling

Collaboration and communication

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

Medical, dental, and vision coverage, flexible vacation, and a 401(k) plan. Meals on in-office days in the US and more.