Senior Software Engineer - Agentic Systems

Coder; United Kingdom; On-site; GBP 90,000 - 130,000; Full time

Job summary

Coder is seeking a Senior Software Engineer to join the Agentic Engineering team. You’ll build and evolve the systems behind our agentic development experience, spanning the agent harness, integrations, and workflows that connect agents with real development environments.

You’ll stay hands-on, solve complex technical problems, and work closely with Product, Design, and other engineers to ship reliable agentic experiences at scale across our platform.

Qualifications

• Strong experience building and operating production software systems.
• Hands-on experience with Go.
• Experience with React and TypeScript.
• Experience building systems around LLMs or agentic workflows.
• Familiarity with model APIs, tool calling, context management, or agent loops.
• Good understanding of distributed systems and production reliability.
• Working knowledge of AWS.
• Strong problem-solving skills and comfort working through technical ambiguity.
• Contributes beyond code through reviews, collaboration, and knowledge sharing.

Responsibilities

• Design and build production systems in Go, with work across React and TypeScript where needed.
• Improve agent execution, tool use, context management, streaming, and long-running workflows.
• Extend our provider-agnostic architecture as models and capabilities change.
• Build reliable integrations between agents, workspaces, tools, and developer infrastructure.
• Own projects from implementation through rollout and iteration.
• Contribute to design reviews, code reviews, and technical discussions.
• Partner with Product and Design to turn agent capabilities into useful developer experiences.
• Improve the reliability, performance, and operability of agentic systems.

Skills

Production systems

Go

React

TypeScript

LLMs / agentic workflows

Distributed systems

AWS

Problem solving

Collaboration

Tools

PostgreSQL

Kubernetes

Prometheus

Grafana

GitHub Actions

Job description

Coder is seeking a Senior Software Engineer to join the Agentic Engineering team. You’ll build and evolve the systems behind our agentic development experience, spanning the agent harness, integrations, and workflows that connect agents with real development environments.

You’ll stay hands-on, solve complex technical problems, and work closely with Product, Design, and other engineers to ship reliable agentic experiences at scale across our platform.