Sierra Software Engineer New Grad, Agent 2027 | London | £120k–£140k

Sierra; Greater London; On-site; GBP 120,000 - 140,000; Full time

Job summary

Sierra seeks a Software Engineer New Grad for Agent projects in London. You will design and deploy AI agents into production, then continuously tune them after launch, participating in the agent development lifecycle rather than pure research.

Strong communication and writing skills are essential. Preferred experience includes production LLM or agent work, evaluation methods, and familiarity with React, TypeScript, or Go.

Qualifications

• New grad for 2027 and able to work on site in London.
• Experience building and scaling an end-to-end production system.
• Comfort with ambiguous problems and with talking to customers.
• Clear writing and speaking for technical and non-technical people.

Responsibilities

• Design the agent and deploy it with the customer.
• Keep tuning the agent after launch as part of the development lifecycle.

Skills

End-to-end system

Customer communication

Technical writing

Ambiguity handling

Tools

React

TypeScript

Go

Job description

Sierra Software Engineer New Grad, Agent 2027 | London | £120k–£140k

Sierra builds customer-facing AI agents for large brands. This new-grad seat is on the team that ships those agents into production: design the agent, deploy it with the customer, and keep tuning it after launch. The work is the agent development lifecycle, not a research-only internship.

Learn AI Tools

The London role is on site. Recent team projects on the posting include churn agents for telecom and media, troubleshooting flows, and voice models wired into enterprise systems. React, TypeScript, Go, and prior LLM production work are listed as extras, not gates.

Eligibility / Key Requirements

• New grad for 2027, able to work on site in London
• Experience building and scaling an end-to-end production system
• Comfort with ambiguous problems and with talking to customers
• Clear writing and speaking for technical and non-technical people
• Preferred: production LLM or agent work, evals, RAG, React, TypeScript, or Go

Compiled from the official posting; verify details on the employer site before applying.