Job title:
Devops Engineer
Location:
London; full in-office working as default
Start date:
ASAP
Reports to:
CTO
Compensation:
Salary : £60 - 90k
Equity : £60 - 90k
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Cosine at a glance
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.
In 2024, Cosine achieved a 72% score on OpenAI’s SWE-Lancer benchmark, placing us among the strongest real-world software-engineering AI systems evaluated.
YC-backed and well-funded, Cosine was founded by experienced operators focused on building dependable, production-grade AI.
This role is based in our Hoxton office, five days a week, because close collaboration, fast feedback, and shared context matter for the problems we’re solving.
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The role
We’re looking for a Devops / Senior Platform / Infra Engineer to own the core infrastructure that powers Cosine’s products — from Kubernetes and deployment pipelines to networking and platform services.
You’ll design and run the “paved road” that our engineers, researchers, and customers build on: reliable Kubernetes clusters, fast and safe CI/CD, solid observability, and hardened environments for demanding enterprise and on-prem deployments. You’ll also wear a classic “DevOps/SRE” hat: thinking in SLOs, running incident response, and keeping us up even as we move quickly.
This is a high-ownership role at a fast-paced, venture-backed Silicon Valley startup. You’ll work directly with founding engineers and leadership, and your decisions will materially shape how we build and ship products.
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What You’ll Do
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What We’re Looking For
Nice To Have (Not Required)
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Experience with:
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AWS primitives like EKS, ECS/Fargate, ECR, SQS, ElastiCache/Redis.
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Argo CD or other GitOps tools for Kubernetes.
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On-prem, air-gapped, or regulated industry deployments (e.g. finance, healthcare).
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AI/ML infrastructure (GPU workloads, model hosting, feature stores).
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Prior experience as an early infra / platform hire at a startup.
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Cosine is an equal opportunity employer.
We value diverse backgrounds, perspectives, and ways of thinking, and we’re committed to creating an inclusive and respectful workplace.
We encourage applications from anyone who meets the role requirements, even if you don’t meet every single qualification. If you need reasonable adjustments at any stage of the hiring process, we’re happy to discuss them.
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Compensation, Benefits & Ways Of Working
We’re an in-office team, five days a week, by design. We believe the work we’re doing benefits from being together, collaborating closely, and building shared context.
What You Can Expect
- 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
We care about focus, sustainability, and doing great work — not performative overwork. We value people who show up, contribute thoughtfully, collaborate well with their colleagues, and then go home.
This role won’t suit everyone. But if you want structure, clarity, strong collaboration, and a team that takes both the work
and
work-life balance seriously, it’s a great place to be.
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Agency & Data Protection Notice
To comply with UK GDPR and our internal data-protection and equal-opportunity obligations, we only accept candidate applications and agency submissions via our Applicant Tracking System (ATS). This ensures appropriate privacy notices, lawful processing, auditability, and consistent retention controls.
Any CVs or candidate details received outside the ATS (including via email, Slack, or direct message) will be treated as unsolicited, will not be considered as part of the recruitment process, and will not give rise to any fee or payment obligation.
