LangChain Agent Engineer - AI-Driven Full-Stack Lead

Focused; Greater London; Hybrid; GBP 104,000 - 128,000; Full time

Job summary

Focused is seeking an Agent Engineer (LangChain) in London to drive AI-enabled software delivery. You will lead end-to-end development across backend services and frontend interfaces, pairing daily to raise quality.

You will guide architectural decisions and collaborate with product managers, designers, and stakeholders to create valuable AI-powered solutions. The role emphasizes hands-on development, LangChain expertise, and strong coaching of teammates, with in-person work four days a week in

Qualifications

• Hands-on, full-stack engineer with experience in collaborative, agile environments.
• Experience with LangChain (or similar agent frameworks) and architecting AI-native systems.
• Strong emphasis on code quality, TDD, and pairing to improve systems and teams.
• Experience across multiple languages/frameworks (Python, Node, Java, React, Next.js) and pragmatic tool selection.

Responsibilities

• Lead end-to-end delivery across the stack from backend services to modern web UIs.
• Pair program daily with teammates to share knowledge and raise code quality.
• Guide architecture decisions to support scalability, observability, and performance.

Skills

Hands-on full stack

LangChain

TDD and pairing

Agile

Cross-functional collaboration

Tools

LangChain

LangGraph

LangSmith

Python

Node.js

React

Next.js

Job description

Focused is seeking an Agent Engineer (LangChain) in London to drive AI-enabled software delivery. You will lead end-to-end development across backend services and frontend interfaces, pairing daily to raise quality.

You will guide architectural decisions and collaborate with product managers, designers, and stakeholders to create valuable AI-powered solutions. The role emphasizes hands-on development, LangChain expertise, and strong coaching of teammates, with in-person work four days a week in