Flagstone

Senior Full Stack Engineer responsible for building and improving resilient cloud-based savings platform software across C#/.NET back end and React front end. This contract role combines system design, architecture, feature delivery, automation, and mentoring.

Staff Engineer leading front-end and mobile technical strategy across 3–5 squads, with hands-on work in React, React Native, and TypeScript. The role combines architecture, cross-team leadership, mentoring, design-system ownership, resilience, performance, and security.

Flagstone is seeking a Senior Security Engineer on contract to operate and improve cloud security, detection, incident response, and vulnerability remediation across its Azure estate. The role offers broad ownership in a small team, with hands-on responsibility for Sentinel, Defender, security automation, and penetration testing.

Senior Cloud Engineer contract role responsible for migrating live services to Flagstone’s Azure cloud and building the infrastructure foundations that support engineering, security, observability, and AI workloads. The role combines Azure platform delivery, networking, infrastructure-as-code, operational support, and internal developer platform enablement.

Flagstone is hiring a Senior Application Security Engineer to own its AppSec programme end to end, from threat modelling and secure design through code review, testing, and remediation. This hands-on role partners directly with product engineering teams to build security into the software development lifecycle.