Senior/Staff Site Reliability Engineer in London

About Engineering at Fonoa

Engineering is central to how we build the business. We focus on solving real customer problems, not just shipping features. We work in small, high-trust teams, with full ownership across the lifecycle, from design to production and beyond.

We value:

• Ownership – engineers own what they build end-to-end
• Simplicity – we break down complex problems into clear solutions
• Thinking Big - we innovate with modern technologies (LLMs, AI Agents, etc.) to solve meaningful problems
• Quality – scalable, maintainable systems are non-negotiable
• Speed & iteration – we ship fast, learn, and improve continuously
• Collaboration – we win as a team, not as individuals

Position Overview

As Fonoa continues to scale globally, we are looking for an Infrastructure Engineer to help us build and operate a reliable, scalable, and self-service platform that enables engineering teams to move fast with confidence. This role sits at the core of how engineering operates at Fonoa. You will work to improve the reliability, observability, scalability, and operational maturity of the systems powering our products, while building tooling and infrastructure that make developers' lives easier across the company.

This is not a traditional “ops” role focused on manual infrastructure maintenance. We are looking for engineers who think in systems, automate relentlessly, and care deeply about developer experience, operational excellence, and long-term maintainability. You will work closely with product engineering teams to improve platform capabilities, evolve our Kubernetes and cloud environments, strengthen observability and reliability practices, and help teams fully own and operate their services in production.

We are looking for someone who thrives in fast-moving environments, enjoys solving operational and systems challenges at scale, and is excited about building infrastructure that stays reliable, simple, and delightfully boring as the company grows.

What Will You Do

• Continuously iterate on our platform, building self-service tooling and services consumed by internal customers (engineering teams).
• Helping to improve our products' observability, availability, security, and latency, so we can always keep our customers happy.
• Participating in an on-call schedule, taking care of the services the team owns.
• Defining and continuously improving our SLIs, SLOs, and SLAs as part of our ever-present effort to achieve operational excellence.
• Helping all engineering teams adopt site reliability.

What We Are Looking For

• You are fully proficient in English. Written and spoken, as we are a bunch from around the world, and we work in English.
• You communicate effectively and asynchronously.
• You have an automation mindset focused on streamlining daily operations.
• You manage infrastructures with code; it doesn't exist if it's not in git.
• You have programming skills in at least one language, or can learn more if the opportunity arises.
• You strongly favour simplicity over complexity.
• You solve problems with other people; you are a team player, not a hero. We share the knowledge (and sometimes the pain).
• You prefer data to opinions when making decisions. And are ok with finding the data yourself when it's missing.
• You have a strong sense of ownership, care about what you build, and build the right thing that serves your customers.
• You are a builder at heart. You like the opportunity to have tons of exposure, make things work for a company long-term, and have an entrepreneurial attitude for anything that comes your way.
• You are comfortable with changes in priorities, goals, and deadlines. You see this more as an opportunity than a hurdle. You are also comfortable challenging the status quo and pushing for change yourself.

What Success Looks Like

• Help us keep our Kubernetes runtime across cloud providers boring, reliable, and delightfully uneventful, using Terraform, CRDs, and common sense.
• Evolve our API gateway layer as product and customer needs grow, ensuring the path between services remains reliable, scalable, and slightly less terrifying.
• Automate, operate, and troubleshoot our data storage platforms, so teams can safely spawn and run their own Postgres and Elasticsearch instances without summoning an SRE every time.
• Keep our observability platform lean and useful across Grafana, Prometheus, and Datadog, empowering engineers to fully own their services rather than merely stare at dashboards in despair.

API Documentation

For engineers, API design and structure are an important part of evaluating a role. You can explore our API and how we build products here: https://docs.fonoa.com/

Tech Stack

We use these technologies today, but we don’t hire for specific tools. We care about engineers who can understand problems, make good technical decisions, and choose the right tools for the job.

• Backend: Node.js, Go
• Frontend: React, TypeScript
• Infrastructure: GCP, k8s, Terraform, Postgres

Note: If you don’t think you have the full experience we’re looking for, but you could be a fit and are willing to learn, do apply anyway! We are building a diverse and inclusive team.

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