Infrastructure engineer (UK)

At WRITER, our mission to expand human capacity with superintelligence relies on a foundational truth: our platform must be available, performant, and reliable, 24/7. As an Infrastructure engineer, you'll be at the heart of making this a reality, impacting every enterprise customer who trusts us with their AI-powered workflows. This isn't just about keeping the lights on; it's about pushing the boundaries of what's possible, proactively identifying and solving complex systemic challenges, and laying the groundwork for our rapid growth and the evolving demands of enterprise generative AI. You'll build resilient systems, automate across the stack, and champion reliability best practices, directly enabling our ambitious product roadmap and ensuring our customers always have access to the powerful tools they need.

Responsibilities

Bring deep focus to one problem at a time with breadth to move between SRE, DevOps, Infrastructure, and Platform work; Challenge the status quo and remove toil before adding features; automate operational tasks and infrastructure management with Python or Go; Design scalable, fault-tolerant infrastructure across AWS (preferred), GCP, and Azure; work fluently across Kubernetes, Helm, Terraform, and supporting cloud/AI tooling; Run agents (Claude Code, Droid, Codex, internal skills) to investigate incidents, draft Terraform/Helm changes, write runbooks, scaffold tooling, and review PRs; Lead incident response, post-mortems, and root-cause analyses; Own the reliability, performance, and efficiency of WRITER's core services end-to-end; define and uphold SLOs and error budgets, carry the on-call pager; Balance this week's critical work with the 6–12-month platform direction; Operate at the seams with product, security, and engineering peers

Requirements

5+ years of experience in infrastructure engineering, DevOps, or a similar role focused on building and operating large-scale, high-availability production systems at a high-growth product company; Experience running containerisation in production (a real cluster, not a lab), with experience in Helm and Terraform or Pulumi on at least one major cloud (AWS preferred), plus good proficiency in Python or Go for automation and tooling; AI is part of how you ship — agentic tooling (Claude Code, Droid, Codex, internal skills) is in your daily loop; you've built or adopted AI-assisted workflows others now use, and you have strong opinions on where it's unreliable; this is a hard requirement, not a bonus; candidates whose actual daily workflow does not already include AI tooling will not be advanced; Demonstrated ability to challenge the status quo, proactively identify systemic weaknesses, and propose innovative solutions to complex reliability problems; ability to reason from constraints and failure modes, name tradeoffs in business terms, and reject best-practices answers when they don't fit; Make reversible calls by default — write the rollback before touching production, work fluently with monitoring and logging stacks (Prometheus, Grafana, ELK or equivalent), and stress the system in safe places; Excellent communication, collaboration, and problem-solving skills with a talent for building strong relationships and connecting with cross-functional teams; A strong sense of ownership and accountability; at least one 0-to-1 infrastructure build owned end-to-end with the outcome metric attached

Nice to have

Software-engineering depth: a software-engineering background, not only config and scripting; designed, built, and shipped non-trivial production code (services, libraries, internal frameworks) in Python, Go, or a comparable language; can read and modify the codebases your infrastructure runs; move between infra automation and feature engineering without changing brains

Benefits

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 and company contribution; Annual work-life stipends for wellness (gym, massage/chiropractor, personal training) and learning/development; Company-wide off-sites and team off-sites; Competitive compensation and company stock options