Software Engineer, Cloud Infrastructure

Job Overview

Software Engineer, Cloud Infrastructure at Cosine Location London Office Employment Type Full time Location Type On-site Department Product & Engineering Compensation £60K – £90K • Offers Equity

About Cosine

At Cosine, we’re building autonomous AI engineers that plan, write, and ship code inside real development workflows. Cosine is designed for on-premise and virtual private cloud (VPC) deployments, including fully air-gapped environments. We build our agent tooling entirely in-house and post-train open-source models to deliver reliable, enterprise-grade coding performance in security-critical settings.

About the Role

An Applications Engineer at Cosine works across research, engineering, product, and design to deliver advanced AI capabilities to consumers and enterprises. You will be responsible for the core infrastructure powering Cosine’s products, including our Kubernetes environments, deployment pipelines, networking stack, cloud abstractions, and foundational platform services.

We build systems that enable rapid product iteration while maintaining operational excellence, with a strong emphasis on enterprise-grade reliability. Our work includes supporting large‑scale deployments for regulated industries, delivering hardened on‑premises installations, and ensuring secure, isolated environments for customers with stringent operational or compliance requirements.

Key Responsibilities

• Design and build development and production platforms that power Cosine products, enabling reliability and security at scale.


• Ensure our infrastructure can scale to the next order of magnitude.


• Contribute to a culture that values diversity, rigorous thinking, and open, direct communication.


• Participate in the on-call rotation to ensure reliability of the systems you build, responding to critical incidents when necessary.

Required Qualifications

• Have 5+ years of experience developing or operating core infrastructure.


• Have experience running large-scale orchestration systems such as Kubernetes.


• Have built abstractions and tooling on top of major cloud platforms.


• Take pride in building scalable, reliable, and secure systems.


• Are comfortable working in a fast-moving environment with evolving priorities.

Benefits

Competitive salary, benchmarked to the market
Equity / share options, so you share in the upside you help create
30 days’ holiday + bank holidays
Genuine 9–5 working hours — we don’t expect late nights or weekend work
Work hard in the office, collaborate closely, and switch off properly
Dog-friendly office — bring your dog to work
Daily lunch provided
Monthly team breakfasts
Monthly socials
Pension
High-quality equipment to do your best work