Senior IAM Developer

REALM; Greater London; Hybrid; GBP 99,000 - 121,000; Full time

Job summary

REALM in London is seeking three Senior Backend Developers to shape the IAM platform across a diverse product portfolio, including GPU instances, clusters, serverless compute, and storage. This role offers a hybrid London office and a strong focus on identity and access management at scale.

You will work on OAuth 2.0/2.1, OIDC, SAML 2.0, JWT, RBAC/ ReBAC, MFA, TOTP, passkeys and FIDO2, with broad design latitude beyond IAM.

Qualifications

• 5+ years as a backend Golang engineer with IAM experience.
• Proficiency in Go for web APIs, concurrency, performance, and caching.
• Experience with TypeScript (Node/React) and RESTful APIs.
• Experience designing and maintaining microservice architectures.
• A strong TDD mindset; Kubernetes/DevOps familiarity is a plus.

Responsibilities

• Shape and evolve the IAM platform across multiple services and a diverse product portfolio (GPU instances, clusters, serverless compute, storage).
• Build robust APIs and resource provisioning tooling in collaboration with SRE and data-centre teams.
• Deliver scalable backend services using Go and microservice patterns; maintain secure, high-available systems.

Skills

Golang

IAM

Backend development

RESTful APIs

Microservices

TDD

TypeScript

Tools

Kubernetes

DevOps

Job description

Senior Backend Developer (IAM) - London (Hybrid, 3 days a week) - x3 openings

Up to £110K

We're hirng for a European AI cloud infrastructure company building next-generation, on-demand GPU compute - vertically integrated, running on 100% renewable energy, and growing fast. They've recently closed a funding round north of $150M and are sitting on a revenue run rate approaching nine figures, having grown roughly tenfold over the past couple of years.

They're live across dozens of markets globally, hold certified partner status with a leading GPU manufacturer, and maintain strong compliance credentials (SOC 2 and similar) - because when you're handling access to high-value compute at scale, identity and access management isn't an afterthought, it's core infrastructure.

We're looking for three Senior Backend Developers to help shape how the IAM platform evolves across a diverse product portfolio (GPU instances, clusters, serverless compute, storage), rather than treating identity as a bolt-on to a single product line.

What you'll work on:

OAuth 2.0/2.1, OIDC, SAML 2.0, JWT, RBAC and ReBAC, MFA, TOTP, passkeys and FIDO2 - with real scope to work on workload and machine identity/service accounts.

It's a genuinely unsolved space at this scale, so there's more design latitude here than most IAM roles can offer. Beyond pure IAM, you'll contribute to large-scale resource planning systems and internal tooling spanning multiple services, building APIs for fast, robust resource provisioning alongside our SRE and data centre teams.

What we're looking for:

• 5 years+ as a backend Golang engineer, with strong hands‑on IAM knowledge


• Proficiency with Go: web APIs, concurrency, performance optimisation, caching


• Experience with TypeScript (we also use Node and React)


• Experience designing, building, and maintaining microservice architectures


• Experience maintaining public RESTful APIs


• A TDD mindset


• Kubernetes/DevOps familiarity is a plus

Practicalities:

Hybrid, a few days a week from the London office. Full-time, permanent.