Platform Engineer (Hiring Immediately) in London

We live in a world that runs on physical industries like energy, logistics, manufacturing. These sectors are essential to our economy and daily lives, yet they are held back by inefficiencies, fragile legacy systems, and decades-old ways of working. This is not just a business problem; it is a societal one. When grids fail, supply chains stall, or factories falter, entire economies are disrupted. These companies face unique, complex challenges that typical software was never designed to solve. Cogna was founded to change this. Our mission is to give critical industries their own AI-powered Software Factory: a way to build and deploy bespoke digital tools that solve pressing operational challenges. Since our launch in May 2023, we’ve seen incredible customer traction and revenue growth. We’re backed by leading VCs, including Notion Capital and Hoxton Ventures, and we’re building a world-class team to take on one of the most important challenges of our time. Tackling challenges at this scale takes people who are curious, adaptable, and motivated by impact. If our mission resonates with you, we encourage you to apply, even if your experience doesn’t match every requirement. We are committed to building a diverse team that reflects the industries and societies we serve.

Overview

We’re hiring a Platform Engineer to help design, build, and maintain the foundation our teams rely on every day. You’ll join our Platform team, which supports security, core infrastructure, and DevX across Cogna. Your focus will be enabling scalability, reliability, and automation of our Azure-based environments—so other teams can move faster, safer, and with greater autonomy. This role is ideal for someone who thrives on solving platform-wide challenges, enjoys working cross-functionally, and is passionate about clean, resilient cloud infrastructure.

What you’ll do

• Design and maintain cloud infrastructure in Microsoft Azure to support internal platforms and product delivery.
• Work within and contribute to our Python/Go codebase.
• Develop and evolve infrastructure-as-code (IaC) using tools such as Terraform.
• Own CI/CD pipelines and DevX workflows in collaboration with the dev teams.
• Implement and monitor security controls, identity management (Entra ID), and network configurations.
• Support container orchestration, and workload deployment using Kubernetes and AKS.
• Improve observability by implementing logging, monitoring, and alerting systems (e.g. Azure Monitor, Datadog, etc.).
• Partner with internal teams to improve resilience, automate toil, and reduce lead time to deployment.
• Drive root cause analysis and reliability improvements from incidents.

What we’re looking for

• Production-grade coding experience: Proficient in writing maintainable, testable, and scalable code in real-world, production environments. Language fluency in Python and/or Go is a plus, but strong engineers with deep experience in comparable languages are welcome.
• Strong foundational software engineering skills: Solid grasp of computer science fundamentals such as data structures, concurrency, time/space complexity, performance and systems design.
• Systems-level thinking: Comfortable reasoning about how things work under the hood—networks, operating systems, compilers, storage systems, or distributed services.
• Infrastructure as Code and automation: Experience with tools like Terraform, Pulumi, or equivalent for managing cloud-native infrastructure declaratively and repeatably.
• Stack Familiarity: We use Azure, Bazel, GRPC, Temporal, Postgres and Kubernetes (AKS). Prior experience or expertise with these is a plus.
• Security-first mindset: Deep appreciation for secure-by-default design. Familiar with principles like least privilege, secrets management, threat modeling, and how to embed security controls into infrastructure and CI/CD pipelines.
• Cross-functional collaboration: Comfortable partnering with other engineers, product managers, sales, marketing, IT and support to define and implement platform capabilities that meet shared goals.
• Strong interest in AI.

What we offer

• Competitive salary and share option plan.
• 25 days annual leave, plus public holidays.
• Excellent pension scheme, company contribution fixed at 7.5%.
• Private healthcare, including family cover and pre-existing conditions.
• Flexible hybrid working with 2 days per fortnight in our Chancery Lane office.
• Regular social events and offsites.
• Access to a gym and fitness classes in our office building.