Back End Developer

We are looking for an experienced backend engineer who wants real ownership. This role is centred on one of the hardest problems in modern software:
authorisation at scale
.

You will lead the design and evolution of our authorisation layer, defining how users, teams and organisations securely access and collaborate on complex, high-value data. Your work will sit at the core of the platform and will directly influence performance, security and developer experience.

This is not a feature factory role. You will shape systems, make trade-offs, and build foundations that other teams rely on.

What you will do

• Own the architecture and implementation of a fine-grained authorisation system for B2B products.
• Design scalable permission models that support organisations, tenants, workspaces, user groups and cross-tenant sharing.
• Build low-latency authorisation checks suitable for real-time and collaborative applications.
• Integrat...