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Staff Engineer

Flagstone
CompanyFlagstone
CategoryEngineering
LocationLondon
RemoteHybrid
EmploymentNot stated
LevelLead
SalaryNot stated by the employer
Posted6 Aug 2026
Last verified7 Aug 2026
SourceEmployer ATS (ashby)
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Description
What is Flagstone? Flagstone is many things. An online savings platform, reinventing how individuals, businesses, and charities manage, protect, and grow their cash. A diverse group of people, bound by a collaborative spirit, and shared purpose. And lastly, a thriving, profitable business – where smart people do their best work. Each definition shares a common thread: our unique culture. It’s our pride and joy. And our competitive advantage. A feel for our culture: To revolutionise the savings market, we need to be at our best. But high performance takes more than talent – it takes a culture of kindness, respect, and growth. That’s why we’re building a diverse, inclusive community, where your voice is heard and valued. Where, with close support and room to develop, you can surpass even your own expectations. And be rewarded for it. We may not change the world, but we can change the world of financial technology. And all it takes is a winning mix of drive, talent, and empathy. Our culture celebrates all three. But enough about us. Let’s talk about you. Does this sound like you? You're a passionate and experienced Staff Engineer specialising in front-end and mobile, who's excited to forge a new way to save! You set the technical bar for React and React Native across a tribe of squads, drive cross-team initiatives, and act as a force multiplier - coaching engineers, shaping architecture, and representing Flagstone in the wider engineering community. What you’ll do: The Staff Engineer will take a leading role in driving front-end and mobile technical strategy across a tribe of 3–5 squads, ensuring the delivery of high-quality systems that meet our business objectives. You'll partner with squads, Engineering Team Leads, and Product to identify how technology can solve business challenges and take a long-term view on company value. You'll also play a crucial role in mentoring and coaching engineers, helping them grow their system design skills and ship robust, scalable solutions. As a technical leader, you'll provide strategic guidance while also contributing hands-on to key projects. This will focus on: - Technical Strategy: Set the front-end and mobile technical vision in collaboration with Engineering Team Leads, aligning with wider business objectives. - Cross-Squad Leadership: Originate and lead horizontal engineering initiatives across the tribe; author and shepherd RFCs from proposal to adoption. - Solution Delivery: Contribute directly to building and maintaining high-quality React and React Native systems while supporting and unblocking other engineers. - Architecture & Design: Own cross-platform architecture decisions for web and mobile (React, React Native, TypeScript), ensuring scalable, reliable, and efficient design with a forward-looking approach. - Design Systems: Lead the evolution of our shared design system across web and mobile, driving consistency, accessibility, and developer velocity across squads. - Mentorship & Multiplier Impact: Coach engineers in system design, coding standards, and testing; start initiatives that others complete; delegate to protect bandwidth for the highest-leverage work. - Communities of Practice: Drive adoption of front-end and mobile engineering practices through CoP leadership and engagement across the tribe. - Horizon Scanning: Identify emerging front-end and mobile technologies, build proof-of-concepts, and create roadmaps for adoption. - Operational Excellence: Champion the "you build it, you run it" philosophy - driving pipeline observability, zero-downtime deployments, robust monitoring, and alerting for front-end applications. - Resilience & Performance: Design solution-wide UI resilience (graceful degradation, back-pressure, retry strategies) and own performance standards across web and mobile. - Quality, Security & Compliance: Own threat modelling and security hardening for tribe front-end products; maintain high standards