# AI Engineer - London at Sequence

> The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday. This is one job from the board.

> Responsibilities: - Design, build and own AI infrastructure

- **Company:** Sequence (https://jobs.trythestack.co/companies/sequence)
- **Location:** London, United Kingdom
- **Work arrangement:** Hybrid
- **Employment type:** Full-time
- **Experience level:** 5–10 years
- **Salary:** GBP 115,000–130,000 per year (as stated by the employer)
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** LLM Systems, Agentic Workflows, Evals Infrastructure, Backend Engineering, Prompt Engineering, AI Security, Kotlin, Postgres, Vertex AI, Langsmith, TypeScript, React, Terraform, Google Cloud Platform, System Architecture, API Design
- **Posted by employer:** 2026-05-15
- **Added to The Stack:** 2026-05-16
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://jobs.ashbyhq.com/sequence/2b03f289-263b-4f2d-92b2-bed646e0bc25 (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/ai-engineer-london-sequence

## About the role

Responsibilities:
- Design, build and own AI infrastructure for production LLM systems: agentic workflows, prompt iteration, tool integration and evals.
- Implement AI‑powered approval workflows that translate natural‑language rules into deterministic, auditable business logic.
- Develop intelligent agents (e.g., collections agent) that run configurable, autonomous workflows with proper context handling and observability.
- Ensure model safety and reliability: threat analysis, sandboxing, testing, monitoring and degradation strategies.
- Collaborate with product and backend teams to ship end‑to‑end features and maintain production quality and latency SLAs.

Requirements:
- Proven track record shipping LLM‑based systems to production and familiarity with failure modes in real customers' environments.
- Experience designing agentic systems, eval frameworks and prompt engineering practices.
- Strong backend engineering skills and production experience (Kotlin/Java, Postgres, GCP/Vertex AI, Terraform, TypeScript a plus).
- Practical knowledge of AI security, testing (e.g., prompt regression tests), monitoring, and tooling (Langsmith, evals, embeddings, memory).
- Comfortable with ambiguity, product‑led development, and building reliable, auditable systems for business‑critical workflows.

## Responsibilities

Build and own the AI infrastructure to enable reliable software on top of non-deterministic models, including agentic workflows and evals. Develop AI-powered approval workflows and intelligent collections agents to automate revenue cycle processes.

## Requirements

Requires a builder with proven experience shipping production LLM-based systems and designing agentic architectures. Must be comfortable with ambiguity and capable of building resilient, business-critical backend systems.

## FAQ

- **Is this AI Engineer - London role still open?** It was posted on 2026-05-15. Listings more than 30 days old may no longer be active, so check Sequence's site before applying.
- **Does Sequence offer visa sponsorship?** This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on Sequence's site.
- **Where is this role located?** The listing gives the location as London, United Kingdom. It is marked hybrid.
- **What is the salary for this role?** The listing states a salary of GBP 115,000–130,000 per year.
- **What skills does this role ask for?** The listing names: LLM Systems, Agentic Workflows, Evals Infrastructure, Backend Engineering, Prompt Engineering, AI Security, Kotlin, Postgres, Vertex AI, Langsmith, TypeScript, React, Terraform, Google Cloud Platform, System Architecture, API Design.

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## Notes for agents

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