Platform Engineer

We’re Capital on Tap 👋
💳 Capital on Tap started because small businesses were underserved. Big banks were slow, their products weren't fit for purpose, and small business owners often couldn't access what they needed. We set out to fix that.
Today we're a financial platform - not just a credit card company. We offer a best-in-class business credit card, SME-focused spend management platform, a savings product that hit £1 billion in funds within its first year, and a growing suite of tools and financial products that make running a small business easier.
1,000+ employees, £20bn in annual card spend, 200,000+ customers, 17,000+ Trustpilot reviews averaging 4.7 stars, and we're profitable. We’ve done a pretty good job so far, but we’re just getting started!
📍London, Old Street | 🏢 2 Days in Office
Core Infrastructure at Capital on Tap 🚀
Core Infrastructure’s mission is to build a secure, patched, cost-efficient cloud foundation, provisioned entirely as code. We own the cloud, network, identity and infrastructure delivery that every product team at Capital on Tap runs on. It’s a big year for the team: we’re consolidating how we manage access and secrets, modernising our edge, moving to GitHub and exploring a multi-cloud future.
We’re also building the infrastructure behind AI at Capital on Tap, connecting our engineers and products to models from Anthropic and OpenAI securely and at scale.
What You’ll Be Doing 🗃️
Build and maintain our Azure foundations using Terraform, including reusable infrastructure modules and a standard Kubernetes baseline.
Help run our network and edge, including Cloudflare, Istio and Cato.
Manage cloud identity and access, including RBAC, managed identities and service-to-service authentication.
Help consolidate secret and certificate management into a single, automated pattern.
Automate infrastructure and core container patching so it runs on a reliable, fixed cadence.
Build and maintain infrastructure CI/CD pipelines, templates and build agents.
Help build and run our AI infrastructure, including model access through Microsoft Foundry, Anthropic and OpenAI.
Support our AI and MCP gateway layer, managing access, routing and authentication for AI tools and agents.
Apply the same security, identity and observability standards to AI services as the rest of our cloud platform.
Look after infrastructure monitoring with Grafana, Prometheus and Log Analytics.
Contribute to cloud cost management, disaster recovery and multi-cloud.
Work with Database Engineering, SRE and Developer Enablement on shared infrastructure projects.
Write clear documentation and help keep our infrastructure standards up to date.
Our Values & Culture 🌞
Just Pilot: We never settle for “good enough”. We pilot new ideas fast, ask questions to figure it out, and scale quickly.
Why Not Today? Fast is as slow as we go - speed and simplicity gives us a competitive advantage.
Be a Buddy: We tap in from day one to help the team, we do the right thing even if it’s hard.
Owners and Dates: We don’t chase people. If you own a task and agree to a date, the expectation is that it gets done.
Feedback: We want our employees to flourish, so we regularly provide direct and constructive feedback.
We’re Looking For 🔎
Experience managing public cloud environments, ideally Azure.
Strong experience writing infrastructure as code with Terraform.
Hands-on experience with Kubernetes and Docker.
Good networking knowledge, including DNS, load balancing, TLS and CDNs or WAFs such as Cloudflare.
Experience with cloud identity and access management, RBAC and secrets management.
Experience building CI/CD pipelines (Azure DevOps, GitHub Actions or similar).
Proficiency in a scripting language such as Go, Rust, PowerShell or Python.
Someone who embraces AI as part of how they work, moves faster, automates repetitive stuff and focuses on the problems that matter, while knowing when to apply their own judgement.
Good communication skills and the ability to work across teams.
Nice to haves 🔎
Experience with AI platforms or LLM APIs such as Anthropic, OpenAI or Microsoft Foundry.