Senior Java Backend Engineer — IAM & Cloud (Hybrid)

Square One Resources is seeking a backend engineer to design and build high-scale Java services in a regulated financial services environment. You will contribute to secure IAM solutions and support high-volume transactional workloads, applying TDD throughout the lifecycle.

The role requires experience in Java, Spring Boot, and IAM (OAuth/Azure) with exposure to cloud platforms (GCP/AWS/Azure). You will also mentor junior engineers and work in a 4-days-per-week office setting in Essex.