Find a job 
Featured Companies 
Featured Universities 
For Companies At a Glance
- Tasks: Design and build scalable infrastructure for cutting-edge AI technology.
- Company: Join Callosum, a pioneering Intelligent Systems company revolutionising AI.
- Benefits: Competitive salary, equity, private healthcare, and relocation support.
- Why this job: Tackle complex challenges and shape the future of heterogeneous intelligence.
- Qualifications: Experience in high-throughput APIs, Kubernetes, and cloud infrastructure.
- Other info: Inclusive workplace with strong growth potential in technical leadership.
The predicted salary is between 101000 - 192000 £ per year.
About Us
Artificial intelligence scaled on a bet - that bigger models, more identical chips, and more data would keep delivering. As problems grow more complex and the requirements of intelligence more diverse, that bet is breaking down. The next era belongs to heterogeneous intelligence: diverse models on diverse chips, each with distinct strengths, co-evolving into systems of capability unreachable by any single model or accelerator. Callosum is the Intelligent Systems company. We built the infrastructure to make that possible. Our co-evolution engine optimises simultaneously across workflows, agents, and silicon. We launched in early 2026 showing orders of magnitude improvements in performance and a shift in the cost-performance frontier that no single chip or model provider can provide. We believe intelligence comes from the system, not the model. We are scientists and engineers solving what others consider impossible. If you thrive on hard problems, and are passionate and energised by the scale of the challenge, we would love to hear from you.
About the Role
As a Staff Platform Engineer, you will design and build the infrastructure that makes our heterogeneous intelligence API scalable and efficient in production at high throughput and rapidly growing scale. This spans the full platform stack: API design and reliability, Kubernetes-based deployment, observability, and cloud infrastructure. The role sits at the intersection of platform engineering, backend infrastructure, and DevOps. As the ideal candidate, you combine deep expertise in backend system design and cloud-native infrastructure, and are comfortable owning hard problems in a fast-paced and highly collaborative environment. You will be working closely with the hardware and orchestration teams. The role has strong growth potential toward technical leadership in platform architecture as we expand our heterogeneous compute infrastructure.
Responsibilities
- Design and build a scalable, robust API platform capable of handling rapidly growing and diverse workloads across heterogeneous compute infrastructure
- Own Kubernetes-based deployment, and reliability for API services in production
- Own platform observability - metrics, tracing, and alerting across the full platform
- Manage cloud infrastructure (AWS) and deployment pipelines
- Work closely with the hardware team to maintain and expose hardware deployment capabilities through the API layer
Qualifications
- Strong experience designing and operating high-throughput APIs (REST or gRPC) with high performance requirements
- Strong hands-on experience with Kubernetes in production - deployment, autoscaling, failure recovery, networking; comfortable owning a cluster, not just deploying to one
- Solid cloud infrastructure fluency (AWS preferred) and hands-on experience with infrastructure as code
- Solid understanding of observability tooling
Nice to Have
- Experience with developer tooling
- Experience as a user or builder of AI-native developer products
What We Offer
- Competitive Salary: £101,000 - £192,000, determined by skills and experience
- Equity & Ownership
- Private healthcare
- We offer Visa sponsorship and relocation benefits to hire the best in the world
- We work in person at our London office. You'll have the tools, space and setup to do your best work, and if you have specific needs, just tell us
- We're committed to building an inclusive workplace where everyone feels welcome, and believe in equal opportunities for all.
Engineer, Platform & Infrastructure in London employer: Callosum
Contact Detail:
Callosum Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Engineer, Platform & Infrastructure in London
✨Tip Number 1
Network like a pro! Reach out to people in the industry, attend meetups, and connect with potential colleagues on LinkedIn. You never know who might have the inside scoop on job openings or can put in a good word for you.
✨Tip Number 2
Show off your skills! Create a portfolio or GitHub repository showcasing your projects and contributions. This is a great way to demonstrate your expertise in backend systems and cloud infrastructure to potential employers.
✨Tip Number 3
Prepare for interviews by brushing up on your technical knowledge and problem-solving skills. Practice common interview questions related to platform engineering and Kubernetes, so you can confidently tackle any challenge thrown your way.
✨Tip Number 4
Don’t forget to apply through our website! We’re always on the lookout for passionate engineers who thrive on hard problems. Your next big opportunity could be just a click away!
We think you need these skills to ace Engineer, Platform & Infrastructure in London
Some tips for your application 🫡
Show Your Passion: When you're writing your application, let your enthusiasm for tackling hard problems shine through. We want to see that you're not just looking for a job, but that you're genuinely excited about the challenges we face at Callosum.
Tailor Your Experience: Make sure to highlight your relevant experience in backend system design and cloud-native infrastructure. We love seeing how your skills align with our needs, so don’t hold back on showcasing your expertise in APIs and Kubernetes!
Be Clear and Concise: Keep your application straightforward and to the point. We appreciate clarity, so avoid jargon and make it easy for us to understand your qualifications and what you can bring to the team.
Apply Through Our Website: We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for the role. Plus, it shows you’re keen on joining our team!
How to prepare for a job interview at Callosum
✨Know Your Tech Inside Out
Make sure you’re well-versed in the technologies mentioned in the job description, especially Kubernetes and AWS. Brush up on your experience with high-throughput APIs and be ready to discuss specific projects where you’ve implemented these technologies.
✨Showcase Problem-Solving Skills
Prepare examples of hard problems you've tackled in previous roles. Think about challenges related to API design, cloud infrastructure, or deployment issues. Be ready to explain your thought process and how you arrived at solutions.
✨Understand the Company’s Vision
Familiarise yourself with Callosum's mission and the concept of heterogeneous intelligence. Being able to articulate how your skills align with their goals will show that you’re genuinely interested and invested in the role.
✨Ask Insightful Questions
Prepare thoughtful questions about the team dynamics, the technology stack, and future projects. This not only shows your enthusiasm but also helps you gauge if the company culture and work environment are a good fit for you.