Skip to content
LangChainLangChainNew York, NY

Senior Fullstack Engineer, AI Observability & Evals Platform

Senior Fullstack Engineer leads architecture and implementation of observability platform features using Go/Python backend and React/TypeScript frontend. Requires 7+ years experience, database expertise (Postgres/Redis), and API scaling skills; onsite in SF with enterprise collaboration.

175k – 225k/yr
On-site7+ YOEFullstack Engineering

About the role

Responsibilities

  • Lead the technical architecture and implementation of key product features for LangSmith, working across 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.
  • Lead by example in writing clean, maintainable, and well-tested code.

Requirements

  • 7+ 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.
  • 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 top-tier customers.
  • Strong ownership mindset.

Nice-to-Haves

  • Experience with AI/LLM-powered applications, developer tools, or observability platforms.

Compensation

  • Annual salary range: $175,000-$225,000 USD
  • Meaningful equity, health and dental coverage, flexible vacation, 401(k) plan, and life insurance.

Skills

GoPythonTypeScriptReactPostgresRedisAPIs

Similar roles

Fullstack Engineering jobs
Tabs

Senior Software Engineer, Payments

TabsNew York, NY

Senior Software Engineer building custom payments workflows and integrations with multiple payment service providers (PSPs) at an AI-native revenue platform. Requires 5+ years experience specializing in payments systems, complex system design, and strong AI interest.

175k – 240k/yr
On-site5+ YOEFullstack Engineering
Tabs

Senior Software Engineer, Merchant Onboarding

TabsNew York, NY

Senior Software Engineer building the full merchant onboarding journey at Tabs, an AI-native revenue platform. Own core backend services, product surfaces, internal tooling, and data flows end-to-end for finance teams. 5-8 years experience; fullstack TypeScript/React skills preferred.

175k – 240k/yr
On-site5+ YOEFullstack Engineering
Bilt Rewards

Senior Full Stack Engineer

Bilt RewardsNew York, NY

Senior Full Stack Engineer building scalable web and mobile experiences for Bilt's rewards platform, including games and member benefits. Own projects end-to-end across React/Next.js frontend, Node.js backend, and PostgreSQL, with 6+ years experience.

175k – 280k/yr
On-site6+ YOEFullstack Engineering
Sprinter Health

Product Engineering Team

Sprinter HealthSan Francisco, CA

Staff-level backend or full-stack engineer building core systems for in-home healthcare delivery, including patient booking, clinician routing, logistics, device integrations, and medical operations at a high-growth startup.

175k – 225k/yr
Hybrid8+ YOEFullstack Engineering
Truemed

Senior Full Stack Engineer

TruemedUnited States

Senior full stack engineer owning large user-facing features on truemed.com. Requires deep Next.js/React/TypeScript frontend expertise plus Python/Django backend experience.

175k – 225k/yr
Remote5+ YOEFullstack Engineering