---
title: 'Principal Backend Software Engineer at Radiant'
canonical: 'https://feeny.ai/job/principal-backend-software-engineer-radiant-london-hevha70mj5tv'
type: 'job'
last_seen: '2026-10-18'
---

# Principal Backend Software Engineer at Radiant

- **Company:** Radiant
- **Location:** London, United Kingdom
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-10-13
- **Last confirmed live:** 2026-10-18
- **Apply:** https://jobs.ashbyhq.com/radiant/4a71ca27-217c-461b-967b-7f8b34fd0d1a/application

**Skills:** Golang, Cloud-native backend development, Distributed systems, APIs, gRPC, REST, Kubernetes, PostgreSQL, CI/CD, Observability, Security, Automation, AI/ML infrastructure tooling, vLLM, KServe, Ray, Triton, Python, ML libraries, GPU scheduling

> Hands-on technical leader driving the design and development of critical AI cloud infrastructure, including GPU orchestration and core backend services. Sets engineering standards, mentors teams, and collaborates across infrastructure and ML domains to deliver high-performance systems.

## Job description

## About the Role

As a Principal Software Engineer at Radiant, you’ll be a hands-on technical leader, driving the design and development of our most critical systems, including our GPU orchestration layer, inference-serving infrastructure, and core platform APIs. You’ll set the standard for engineering excellence across the team, working closely with other principal engineers to align on strategy and drive technical leadership. You’ll partner with peers in infrastructure and machine learning to deliver high-performance AI systems, and mentor engineers across multiple squads. While you won’t have direct reports, you’ll play a pivotal role in shaping engineering direction, design decisions, and cross-team collaboration. What You’ll Do:

- Design and develop core services for the Radiant AI Cloud
- Architect and build core backend services in Go that power AI infrastructure, networking, inference orchestration, and model lifecycle management
- Lead engineering design efforts across the backend domain - architecture reviews, and system evolution strategies
- Collaborate closely with platform and infrastructure to deliver reliable, secure, production-grade services
- Drive technical standards and mentorship, upholding code quality, observability, and maintainability across teams
- Proactively identify and resolve architectural bottlenecks, performance issues, or scaling challenges

What you bring:

- Proven expertise in Golang and cloud-native backend development
- Deep experience designing and deploying distributed systems and APIs (gRPC, REST) in production environments
- Strong knowledge of Kubernetes internals, with deep understanding of primitives, deployments and reconciliation loops.
- Experience with PostgreSQL or equivalent high-performance data stores
- Experience with CI/CD workflows, observability, security and automation best practices
- Demonstrated ability to lead technically: mentor others, drive architectural thinking, and influence across teams
- A bias for action, accountability, and leading by example

## Preferred Skills (Nice to Have)

- Experience with AI/ML infrastructure tooling (e.g. vLLM, KServe, Ray, Triton)
- Familiarity with Python, especially ML libraries and model interfaces
- Familiarity with GPU scheduling, inference pipelines, or resource-constrained workload orchestration
- Exposure to GPU orchestration frameworks or building services for model training/inference
- Understanding of multi-tenant systems, isolation strategies, and secure infrastructure for AI workloads

How you work:

- You approach problems with a systems mindset - balancing practical execution with long-term scalability
- You elevate the team, setting high standards for technical quality and engineering excellence.
- You hold yourself and others accountable - giving direct feedback and expecting the same
- You take initiative, owning challenges end-to-end and proactively driving solutions.
- You invest in others, mentoring to build both capability and confidence.
- You communicate clearly - translating complexity into clarity across engineering and business audiences

Qualities we look for:

- Set the standard: Every single day, you spot opportunities to constructively shake things up.
- Inspire the change: There's no blueprint for the future. You’ll embrace challenges and change.
- You’re real and you’re true to yourself: We cherish and celebrate diversity so you’ll feel right at home whoever you are and whoever you’re talking to, you treat everyone the same.

Why should you join us? What sets us apart is our blend of modern technology, competitive benefits, and an open, welcoming work culture that enables our people to thrive. Here are just some of the great things you can expect from us:

- 25 days of annual leave
- A culture that emphasises results over hierarchy, process & ego: we place great emphasis on the quality, ingenuity and creativity of work.
- Open communication, regular feedback: we value smooth collaboration, direct and actionable feedback, and believe that leading with empathy and a growth mindset makes us better together.
- Learning Time: we all have dedicated learning time to focus on new skills, projects or interests that lay outside of your day-to-day job.
- Health & Wellbeing: we want everyone to feel healthy and happy, so we offer private medical insurance via Bupa.
- Cycle to Work Scheme: we're committed to building a sustainable business, so we encourage cycling to work.
- Gympass subscription to a variety of gyms and wellbeing apps
- Participation in the company shares program
- Enhanced parental pay & leave

Diversity, Equality, Inclusion and Belonging We are an equal opportunity employer and we strive to reduce unconscious bias throughout our hiring process. All applicants will be considered for employment without attention to ethnicity, religion, sexual orientation, gender identity, family or parental status, national origin, veteran, neurodiversity status or disability status. To ensure our recruitment processes provide an equal opportunity for all applicants to succeed, we encourage you to let us know if there are any adjustments that we can make.

## About Radiant

## Company Overview
- **One-liner**: Radiant is a vertically integrated AI infrastructure company that builds and operates AI factories combining utility-scale powered land, long-term capital, and a proprietary software platform.
- **Entity Type**: Private (portfolio company of Brookfield’s AI Infrastructure Fund)
- **Headquarters**: London, United Kingdom
- **Founded**: 2026 (formed via merger of Brookfield’s Radiant entity with Ori Industries)
- **Founders**: Mahdi Yahya (Founder & former CEO of Ori, now President of Radiant)

## Core Business
- **Primary industry**: AI Infrastructure / Cloud Computing / Data Centers
- **Target customers**: Sovereign governments, large enterprises, telecommunications providers (B2B, Enterprise, Sovereign)
- **Mission or purpose statement**: “Building the utility model for AI compute — ubiquitous, always on and offering superior economics. That model will power the intelligence revolution — giving every nation, enterprise and network the foundation to build what comes next.” [radiant.co](https://radiant.co/about)

## Products & Services
- **Radiant AI Cloud**: On-demand AI compute platform offering pre-configured bare metal offerings, GPU instances, and AI-as-a-Service offerings including Inference, Fine-Tuning, Model Registry, Kubernetes, and high-performance Storage.
- **AI Factories (Sovereign/Enterprise Deployments)**: Purpose-built, vertically integrated AI data centers built on the NVIDIA DSX reference design, offering utility-grade economics under long-term contracts for sovereign governments and select enterprises.
- **Powered Land Portfolio**: Access to over 5 GW live and 45 GW of renewable generation capacity globally — enabling rapid deployment of massive AI compute clusters at 20% below-market power costs through a mix of hydro, wind, geothermal, biomass, and dispatchable natural gas. [radiant.co](https://radiant.co/)
- **Proprietary Software Platform**: Dependency-free, lightweight architecture built on engineering first principles, featuring intelligent scheduling, automated node management, secure multi-tenancy, and a distributed control panel. Scales consistently from 10K to 100K+ GPUs.

## Market Standing
- **Valuation/Market Cap**: Not publicly disclosed as a private entity. Backed by Brookfield with access to a $100 billion investment program for AI Infrastructure (Brookfield AI Infrastructure Fund).
- **Key Metric**: Total funding — Backed by Brookfield, with “more than $100 billion in deployable capital” available to the fund. Radiant is the first compute deployment vehicle and second seed investment for Brookfield’s AI Infrastructure Fund. [radiant.co](https://radiant.co/press-release-launch)
- **Notable Investors/Partners**: Brookfield (global alternative asset manager), NVIDIA (Cloud Partner — using NVIDIA Blackwell, GB200 NVL72, and upcoming Rubin architectures)
- **Growth Signals**: Recently launched (February 24, 2026) via merger of Radiant and Ori Industries. Targeting the multi-trillion market for integrated AI factories over the next decade. Rapidly expanding Ori’s integrated AI Cloud assets with the latest NVIDIA platforms.

## Competitive Advantages
- **Vertically Integrated Model**: Uniquely combines capital (Brookfield), powered land (5 GW live, 45 GW renewable capacity), proprietary software (built from first principles), and compute (NVIDIA partnership) into a single platform — “from silicon to service.”
- **Cost Advantage**: 20% below-market power costs through a balanced energy mix.
- **Capital Advantage**: Direct pipeline to $100B+ investment program, enabling massive, long-duration projects that competitors cannot match.
- **NVIDIA DSX Reference Design**: First-mover advantage in deploying at scale using NVIDIA’s latest architectures (Blackwell, Rubin) with full design and operational ownership.
- **Sovereign Focus**: Positioned as a partner for nations seeking AI infrastructure independence — a growing geopolitical priority.

## Strategic Focus
- **Scale AI Factories Globally**: Rapidly deploy AI compute capacity using the NVIDIA DSX reference design for sovereign governments, enterprises, and telecoms under long-term contracts.
- **Expand the Ori Global AI Cloud**: Continue to grow the on-demand AI cloud for customers needing rapid deployment and flexible capacity.
- **Maintain Vertical Integration**: Control every layer from capital and energy to software and hardware, ensuring operational autonomy and superior economics.
- **Long-term Planning**: Aligned with the long-term demands of the AI economy — thinking in decades, not quarters.

## Why Work Here
- **Culture**: “Outcome oriented” — the company values people who get things done, dream bigger, think in longer timelines, and build the assets that make every other ambition possible. [radiant.co](https://radiant.co/about)
- **Remote/Hybrid Policy**: Flexible work options, including remote and hybrid arrangements.
- **Compensation**: Competitive compensation with performance-based incentives and meaningful stock options.
- **Benefits**: Learning and development support, family-friendly policies with paid parental leave, generous vacation and company holidays.
- **Engineering Culture**: Led by CTO Chris Galloway (previously CTO at Ori, with experience at Broadcom/Symantec) and VP Product Joao Coelho (former AWS Solutions Architect, co-founder of open-source Multy). The team is building a proprietary, dependency-free software platform from first principles — appealing to engineers who want deep technical ownership.
- **Growth Opportunity**: Early-stage (launched Feb 2026) with massive capital backing — employees can shape the company’s trajectory and work on infrastructure at unprecedented scale (10K to 100K+ GPUs).
- **Hiring**: Actively hiring across every department. [radiant.co](https://radiant.co/about)

## Sources
1. [radiant.co - Homepage](https://radiant.co/)
2. [radiant.co - About Page](https://radiant.co/about)
3. [radiant.co - Press Release Launch](https://radiant.co/press-release-launch)
4. [Tech.eu - Radiant and Ori Merge](https://tech.eu/2026/02/24/radiant-and-ori-merge-to-deliver-sovereign-ai-cloud-at-utility-scale/)
5. [radiant.co - Blog: The Age of Abundance in AI](https://radiant.co/blog/the-age-of-abundance-in-ai)

## Other roles at Radiant

- [Engineering Manager](https://feeny.ai/job/engineering-manager-radiant-london-q8ze4dytf2t1) — London, United Kingdom
- [Head of Design](https://feeny.ai/job/head-of-design-radiant-united-states-3p6549d00q06) — United States
- [Project Co-ordinator](https://feeny.ai/job/project-co-ordinator-radiant-united-kingdom-36vzbjecdtvv) — United Kingdom
- [Principal/Staff Security Engineer](https://feeny.ai/job/principal-staff-security-engineer-radiant-united-kingdom-2w2a2xkg3yrb) — United Kingdom
- [IT Operations Systems Assistant](https://feeny.ai/job/it-operations-systems-assistant-radiant-london-zaf5bg0tjhmv) — London, United Kingdom
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