AI Agent Engineer — Production-Scale Systems

Sierra; Greater London; On-site; GBP 120,000 - 160,000; Full time

Benefits offered by this job

Flexible (unlimited) paid time off

Medical, dental, and vision benefits

Life insurance and disability benefits

Retirement plan

Parental leave

Fertility and family benefits

Lunch and snacks

Discretionary benefit stipend

Free alphorn lessons

Job summary

Sierra is a leading platform for customer-facing AI agents, working with top brands worldwide and expanding offices. You will design and deliver production-grade AI agents, own the ADLC, and partner with enterprises and startups to scale impact.

You’ll help shape Sierra’s core platform while directly engaging with customers to understand needs and drive outcomes. We seek builders who ship, communicate clearly, and thrive in dynamic environments.

Qualifications

• Experience building and scaling end-to-end production systems.
• Strong technical problem-solving in fast-changing environments.
• Builder mindset with high agency and shipping capability.
• Comfort working directly with customers to understand needs.
• Excellent communication across technical and non-technical audiences.

Responsibilities

• Design and deliver production-grade AI agents central to Sierra's growth.
• Own the Agent Development Life Cycle from pilot to deployment.
• Collaborate with enterprises and startups to scale AI agents.
• Shape the platform by surfacing needs and prototyping features.

Skills

End-to-end systems

Production-grade software

Technical problem-solving

Customer-facing work

Clear communication

Tools

React

TypeScript

Go

Eval frameworks

RAG pipelines

Prompt engineering

Job description

Sierra is a leading platform for customer-facing AI agents, working with top brands worldwide and expanding offices. You will design and deliver production-grade AI agents, own the ADLC, and partner with enterprises and startups to scale impact.

You’ll help shape Sierra’s core platform while directly engaging with customers to understand needs and drive outcomes. We seek builders who ship, communicate clearly, and thrive in dynamic environments.