Engineering Team Lead - 12 month FTC in London

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, working in a thriving, profitable business where smart people do their best work.

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, with close support and room to develop.

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

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:

• You’ll 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.
• You will run day-to-day delivery and performance management, handling underperformance and any exits directly.
• Expect the emphasis to sit more on driving commercial delivery at pace than on longer-term development pathways.
• You’ll work as a peer across the tribe, contributing to engineering-wide standards and representing 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, and DDD.
• RESTful API design and SQL skills.
• Cloud-native Azure development.
• 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.
• Comfort working in an agile environment, being the final escalation point for decision making.
• An ability to assess and weigh risk, making sound, defensible decisions.

On the people side:

• A track record of direct, fair performance management.
• Confident stakeholder management, translating technical trade-offs for non-technical audiences.
• Genuine enthusiasm for coaching and developing engineers.
• Proactive, collaborative problem-solving.

How we reward you:

• Hybrid working - Spend at least 1 day a week with your team in our collaborative London office.
• 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.
• Learning and development - £1,000 personal development budget.
• 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.