Senior Fullstack Engineer — AI Observability & Evals Platform

Fdetimes; Boston (MA); On-site; USD 175,000 - 240,000; Full time

Benefits offered by this job

Medical, dental, and vision coverage

Flexible vacation

401(k) plan

In-office meals in the US

Equity

Job summary

LangChain is seeking a Senior Fullstack Engineer to join the LangSmith team in Boston, MA. You will own the architecture and implementation of core features across Go, Python, and TypeScript, collaborating closely with customers, product, and design teams.

You should have 5+ years of software engineering experience on complex platform products, strong API design skills, and hands-on work with PostgreSQL and Redis. The role is onsite, with competitive compensation and equity.

Qualifications

• 5+ years of software engineering on complex platform products.
• Backend: Go or Python; Frontend: React + TypeScript.
• Experience with PostgreSQL and Redis.
• Experience designing and scaling APIs in high-performance data apps.
• Strong communicator with ability to collaborate with stakeholders.
• Ownership mindset and ability to ship quickly.

Responsibilities

• Lead architecture and implementation of LangSmith features across Go, Python, and TypeScript stack.
• Collaborate with product and design to iterate on new features.
• Drive aggressive timelines while maintaining high engineering standards.
• Lead by example with clean, maintainable, and well-tested code.

Skills

Strong communication

Ownership mindset

Team collaboration

API design

Tools

Go

Python

React

TypeScript

PostgreSQL

Redis

Job description

LangChain is seeking a Senior Fullstack Engineer to join the LangSmith team in Boston, MA. You will own the architecture and implementation of core features across Go, Python, and TypeScript, collaborating closely with customers, product, and design teams.

You should have 5+ years of software engineering experience on complex platform products, strong API design skills, and hands-on work with PostgreSQL and Redis. The role is onsite, with competitive compensation and equity.