Site Reliability - Member of Technical Staff
Callosum —London
- £101,000 - £192,000 a year
- Full-time
Quick apply
Applied AI - Member of Technical Staff
Callosum —London
- £101,000 - £192,000 a year
- Full-time
- Master's degree
- AI
Quick apply
Forward Deployed Engineer - Security Clearance Required
Virtru —Farnborough
- £125,000 - £160,000 a year
- In-person
- Communication skills
- Annual leave
- Employee assistance programme
Quick apply
DevOps Engineer - CIMAR
DeepHealth —London
- £60,000 - £70,000 a year
- Full-time
- Remote
- Computer Science
- DevOps
- Engineering
Quick apply
Platform Engineer - AI Trainer - Freelance - 8-20hrs/week - Remote
10x Team —London
- £84 - £150 an hour
- Remote
- AI
Quick apply
Staff Engineer for IT Automation & AI transformation (Remote)
SoSafe —London
- Full-time
- Remote
- Mentoring
- IT
- AI
- Employee discount
- Flexible schedule
AWS Cloud Platform Engineer - Permanent UK
Satalia —London
- Remote
- DevOps
- AWS
- School
- Flexible schedule
6d
Forward Deployed Engineer
Salesforce —London
- Full-time
- Computer Science
- Salesforce
- Travel
2nd Line Infrastructure & Platform Engineer
MicroNet —Watford
- £35,000 - £45,000 a year
- Overtime
- Hybrid work
- SharePoint
- In-person
- Annual leave
Quick apply
10d
Mobile Platform Engineer
DL Remote —London
- Up to £110,000 a year
- Mentoring
- In-person
- AI
- Relocation assistance
Senior Data Platform Engineer
Much Better Adventures —London
- £85,000 - £95,000 a year
- Full-time
- Remote
- AI
- Analytics
- Employee discount
- Flexible schedule
Quick apply
9d
Senior Platform Engineer
Motorola Solutions —Uxbridge
- Full-time
- English
- Analysis skills
- No travel
- Employee stock purchase plan
- Employee assistance programme
Staff AI Agent Engineer – Moveworks | Customer Deployment
ServiceNow —Staines-upon-Thames
- Full-time
- Remote
- Travel
- Scripting
- AI
Quick apply
9d
AWS Infrastructure Engineer
Securitas —London
- Remote
- Computer Science
- No degree
Senior Platform Engineer
JPMorganChase —London
- £175,750 - £260,000 a year
- Full-time
- Master's degree
- Mentoring
- Scripting
DevOps/Site Reliability Engineer, Junior/Mid/Senior (m/f/*)
Quaisr —London
- £50,000 - £85,000 a year
- Full-time
- Hybrid work
- DevOps
- Scripting
- Communication skills
- Annual leave
Senior Infrastructure Engineer
Laravel —London
- Full-time
- Remote
- AWS
- Annual leave
Quick apply
Forward Deployed Engineer
Linux Recruit —London
- £120,000 - £160,000 a year
- AI
- Leadership
Platform Engineer
London Stock Exchange Group —London
- Full-time
- Azure
- DevOps
- Scripting
Senior Platform Engineer
Octopus —London
- Full-time
- Hybrid work
- Scripting
- Life insurance
Quick apply

I want to receive the latest job alerts for platform engineer in harmondsworth

By signing in to your account, you agree to SimplyHired's Terms of Service and consent to our Cookie and Privacy Policy.

Site Reliability - Member of Technical Staff

Callosum
London

Quick apply

Job details

Full-time
£101,000 - £192,000 a year

Benefits

UK visa sponsorship
Private medical insurance

Qualifications

CI/CD
Incident response
CI/CD pipelines
Infrastructure provisioning automation

Full job description

About Us

We’re living through a Cambrian explosion of intelligence: new models and new chips, each specialised for different tasks, are arriving all at once. The result is a new era for AI, one of radical heterogeneity.

Callosum is the Intelligent Systems Company. We believe the next generation of AI won't be defined by any single model or chip, but by intelligent systems in which hardware and intelligence co-evolve. We are building the infrastructure that unifies heterogeneous compute across the full stack. This opens a new axis of scaling intelligence: a dynamic system that tailors itself to what each workload actually needs, whether that's speed, cost, precision, or whatever unit comes next.

The last era scaled on a different bet: one bigger model, more of the same chip, more data. That bet is running into structural limits. Frontier models offer extraordinary capability at unsustainable cost, one that today's monolithic infrastructure was never designed to serve.

Our founding principle is that intelligence comes from many specialised systems working together, not from any single component. We build the software orchestration layer that co-evolves models, workflows and silicon into one system, delivering inference tailored to every workload, and demonstrating orders-of-magnitude leaps in capability and cost.

Because our software spans the full stack, our engineering team works directly with heterogeneous accelerators and frontier silicon, including Cerebras, d-Matrix, Intel, NVIDIA, AMD, Normal Computing, Tenstorrent, GreatSky, and Mixx. We are not stopping at today's chips: each new generation of silicon unlocks algorithms that couldn't run before, and we intend to be first to them, every time. If we get it right, it will belong to everyone building on it - not to any single vendor.

In our latest funding round, we raised $100M, led by Atomico with participation from Plural, DCVC and the UK Sovereign AI Fund’s first investment. With this, we are building the infrastructure for the next era of intelligence.

We are engineers and scientists based in London, working across the full depth of the stack. We are curious, intellectually honest, and building what doesn't exist yet. If you thrive on uncharted territory and are energised by the scale of the challenge, we'd love to hear from you.

About the Role

Our platform is the production system our customers route real traffic through. When it degrades, their product degrades. You will own its operational health end-to-end: SLOs, observability, incident response, deployment discipline, and capacity planning across heterogeneous compute backends. As the platform scales to millions of concurrent requests across heterogeneous compute, the work shifts from building the operational foundation to defending it under conditions most teams never encounter.

You'll define "production-grade" means for a platform at the centre of a fast-growing company, and own it end to end. The reliability practice is yours to build. You will work closely with the platform team, setting the technical direction. You will work closely with the hardware and orchestration teams to expose heterogeneous backends reliably through the platform.

Who You'll Build

Service-level objectives, monitoring, alerting, and observability
On-call and incident response: runbooks, escalation, blameless postmortems, and follow-through
Capacity planning and the operational side of running across heterogeneous compute backends

What You Bring

Strong SRE or production-engineering background running customer-facing systems at scale
Fluency with modern operational tooling: observability stacks, container orchestration, infrastructure-as-code, CI/CD
Experience owning incident response and driving reliability improvements.
Compliance execution experience

What Sets You Apart

Open-source contributions to relevant infrastructure, or production systems whose scale and complexity you can speak to in detail
Early-stage and AI-native company experience

What We Offer

Competitive Salary, 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.

Compensation Range: £101K - £192K

Quick apply

Refine Your Search

platform engineer jobs in harmondsworth

Site Reliability - Member of Technical Staff

Applied AI - Member of Technical Staff

Forward Deployed Engineer - Security Clearance Required

DevOps Engineer - CIMAR

Platform Engineer - AI Trainer - Freelance - 8-20hrs/week - Remote

Staff Engineer for IT Automation & AI transformation (Remote)

AWS Cloud Platform Engineer - Permanent UK

Forward Deployed Engineer

2nd Line Infrastructure & Platform Engineer

Mobile Platform Engineer

Senior Data Platform Engineer

Senior Platform Engineer

Staff AI Agent Engineer – Moveworks | Customer Deployment

AWS Infrastructure Engineer

Senior Platform Engineer

DevOps/Site Reliability Engineer, Junior/Mid/Senior (m/f/*)

Senior Infrastructure Engineer

Forward Deployed Engineer

Platform Engineer

Senior Platform Engineer

I want to receive the latest job alerts for platform engineer in harmondsworth

Related Searches

Explore jobs in more locations

About Us

About the Role

Who You'll Build

What You Bring

What Sets You Apart

What We Offer

Jobseeker tools

Employer Tools

Browse

Stay Connected