Principal Software EngineerLondon - 4 days onsite£110k - £140k + BenefitsWe''re hiring for one of the UK''s fastest growing fintech scaleups, where reliability is a competitive advantage not a luxury. As a Principal Software Engineer you will be providing deep technical leadership alongside being extremely hands on as part of a platform team. Principal Engineers will set technical directions, drive engineering standards and strategy while remaining deeply Embedded in implementation and operational excellence. Responsibilities:Architect and implement highly available, multi-region infrastructure servicesDefine resilience patterns across services (failover, circuit breaking, back-pressure, etc.)Lead large-scale refactoring or reliability improvement initiativesEstablish best practices in incident response, observability, and SLO managementDrive adoption of modern cloud-native and GitOps practicesMentor senior engineers and influence engineering culture at scaleSkills Required: Strong Back End engineering ability (Go, Java or .NET) Extensive hands on expertise designing and operating high scale distributed systemsDeep expertise in cloud native architecture (GCP/AWS) Advanced Kubernetes and container orchestration expertiseProven track record of mentoring and technical leadership. Why this role: You''ll get the opportunity to influence architecture across a multi country product.You''ll work in an engineering led organisation where technical excellence drives business successHave