Software engineer, agents (UK)

Stack

Responsibilities

• ▹Design, implement, and maintain scalable, secure agent-driven services using modern AI frameworks
• ▹Build and enhance high-throughput APIs and infrastructure for core agent capabilities: memory, communication channels, skills, decision logic, security, and workflow management
• ▹Integrate agent capabilities with backend services, data stores, vector databases, search/retrieval systems, and external APIs
• ▹Collaborate with product managers, AI researchers, data engineers, and UX teams to turn high-level agent use cases into production-ready software
• ▹Ensure reliability, monitoring, and observability for all agent components (metrics, logging, CI/CD, fault tolerance)
• ▹Contribute to architectural decisions and participate in rigorous code reviews

Requirements

• ▹3+ years of professional software engineering experience with strong (3+ years) production Python proficiency
• ▹Proficiency in native agentic coding, using tools like Cursor and Claude Code on a daily basis
• ▹Demonstrated experience building distributed systems, microservices, or complex backend APIs for AI/agent workflows
• ▹Solid expertise with systems integrating AI models, agent frameworks (e.g. LangGraph, Agent Harness), vector databases, and large-context reasoning services
• ▹Understanding of agent orchestration patterns, state management, and asynchronous workflows
• ▹Experience with cloud platforms (AWS, GCP, Azure), containerization (Docker, Kubernetes), and operational best practices
• ▹Good grasp of performance optimization, testing, and CI/CD pipelines
• ▹Excellent communication and collaboration skills

Nice to have

• ▹Past work on AI agents coordinating multi-step actions, reasoning, or autonomous decision loops
• ▹Contributions to open-source agent toolkits or SDKs
• ▹Frontend experience (React, TypeScript) for agent management tooling

Soft skills

What we offer

• ▹Generous PTO plus company holidays
• ▹Comprehensive medical and dental insurance
• ▹Paid parental leave for all parents (16 weeks)
• ▹Fertility and family planning support
• ▹Early-detection cancer testing through Galleri
• ▹Competitive pension scheme with company contribution
• ▹Annual wellness and learning & development stipends
• ▹Company-wide and team off-sites
• ▹Competitive compensation and stock options

About the company

WRITER is the enterprise AI platform used by the world's leading companies to orchestrate AI-powered work. Its mission is to expand human capacity through trustworthy, enterprise-grade LLMs and AI agents, with customers including Mars, Marriott, Uber, and Vanguard. Founded in 2020 and valued at $1.9B, WRITER is backed by leading investors such as Premji Invest, Radical Ventures, and ICONIQ Growth, with hubs in San Francisco, New York City, Seattle, Austin, Chicago, and London. This is a hybrid role based in the London hub.