Engineering Team Lead - 12 month FTC

Flagstone is an online savings platform, reinventing how individuals, businesses, and charities manage, protect, and grow their cash. We are a diverse group of people, bound by a collaborative spirit and shared purpose, creating a thriving, profitable business where smart people do their best work.

Our unique culture is our pride and joy and our competitive advantage. To revolutionise the savings market, we need to be at our best. High performance takes more than talent; it takes a culture of kindness, respect, and growth. We're building a diverse, inclusive community where your voice is heard and valued, allowing you to surpass even your own expectations.

As a hands-on Engineering Lead with around 10 years' experience, you will run a squad with real autonomy. You'll lead the Banks squad on the Bank Portal, the partner-facing application our banking partners use to view and act on their Flagstone relationship. By the time you start, the squad will have delivered the foundational rebuild, and you'll pick up the next phase: building the commercial capability on top of that foundation.

This is a full-stack squad (.NET backend, React/TypeScript frontend) working in a regulated, data-sensitive environment, so the role carries real weight: partner-facing delivery, strict data isolation between banks, and the judgement calls that come with both.

What you’ll do:

• Own the squad's technical direction and quarterly roadmap, driving the commercial features that build on the migrated foundation while keeping the newly-migrated platform stable.
• Make most technical debt and risk calls autonomously, escalating only where tribe-level coordination is genuinely needed.
• Run day-to-day delivery and performance management, including handling underperformance and any exits directly.
• Focus on driving commercial delivery at pace within the FTC's 12 months, while still coaching engineers and creating stretch opportunities.
• Contribute to engineering-wide standards and represent the squad's constraints and progress in tribe-level planning.

What you’ll bring:

• Strong commercial C#/.NET experience, with a solid grasp of SOLID, event-driven architecture, DDD RESTful API design, and SQL skills.
• Cloud-native Azure development experience.
• Frontend fluency to review React/TypeScript work.
• TDD in practice (NUnit, MSTest, Playwright/Selenium or similar).
• Experience with agentic development tools (Claude Code or similar).
• Comfort working in a regulated or data-sensitive environment.
• Ability to assess and weigh risk, making sound, defensible decisions.
• A track record of direct, fair performance management.
• Confident stakeholder management and the ability to translate technical trade-offs for non-technical audiences.
• Genuine enthusiasm for coaching and developing engineers.
• Proactive, collaborative problem-solving skills.

How we reward you:

• Hybrid working - Pop into our London office to spend time with the team.
• Competitive bonus scheme designed to reward and recognise high performance.
• Flexible benefits budget for meaningful benefits.
• A range of salary sacrifice options for tax-efficient savings.
• Around the World scheme - 3 months work from anywhere scheme.
• Mental wellbeing support through therapy and mental health sessions.
• £1,000 personal development budget to help you grow in your role.
• Private health care with AXA benefits.
• Medical cash plan for dental and optical expenses.
• Life insurance and Income Protection - four times your annual salary.
• Matched pension contributions up to 5%.
• 25 days holiday plus bank holidays, well-being days, and volunteering days.
• Enhanced Parental Leave.

All are welcome. At Flagstone, we're assembling a diverse team that defies our industry's norms.