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Principal Engineer, Identity and Access Management
LondonSource: WhatJobs
£150,000–£190,000
Lead the design and engineering of a cloud-agnostic Identity and Authorization Platform that secures users, services, APIs, AI agents, and data across a multi-tenant SaaS platform.
Unlike traditional IAM roles, this position focuses heavily on authorization architecture.
Responsibilities
Lead architecture and implementation of:
Authentication
Authorization
Identity federation
Fine-grained access control
Own architecture for:
RBAC
ReBAC
ABAC
ACL
Policy engines
Relationship graphs
Design authorization for:
Web applications
Mobile
APIs
Microservices
AI Gateway
Agent runtime
MCP tools
Design authorization decision architecture:
PEP
PDP
Policy Store
Relationship Store
Decision
Lead adoption of:
OpenFGA / SpiceDB
Cedar
Open Policy Agent (OPA)
Zanzibar concepts
Work with platform teams on:
API Gateway
AI Gateway
Kubernetes
Service Mesh
mTLS
Essential experience
10+ years engineering
5+ years security platform experience
Demonstrable experience building authorization engines using:
RBAC
ReBAC
ABAC
ACL
Experience designing authorization for:
Multi-tenant SaaS
Microservices
APIs
Experience with:
OAuth2
OpenID Connect
JWT
SAML
Strong distributed systems experience
Nice to have
Google Zanzibar
OpenFGA
SpiceDB
OPA
Cedar
Envoy
Istio
SPIFFE/SPIRE
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