Senior Flutter Engineer

Build the investing experience people rely on.

At AJ Bell, we believe investing should feel good. For many of our customers, our app is one of the main ways they manage their investments, so creating an experience that feels simple, intuitive and dependable really matters.

We're looking for an experienced Senior Flutter Engineer to help shape the next generation of our customer-facing mobile experience. You'll be part of the team building our Flutter app, which is replacing our long-standing native iOS and Android applications and serving a D2C business of more than 500,000 customers.

This is a hands-on, product-centric role where you'll help turn customer needs into great mobile experiences. You'll care about how things look and feel, as well as how they work, and you'll build tested, resilient and performant software that customers can rely on.

You'll work closely with Product, Design and Engineering to develop, shape and iterate the app, bringing technical expertise and a user-first mindset to the decisions we make.

• Architect solutions with your team and write clear technical documentation that defines what we're building and why.
• Write well-structured, readable and testable code using appropriate software engineering principles and patterns.
• Build resilient, performant and accessible mobile experiences with the customer at the centre.
• Diagnose, troubleshoot and resolve defects across the mobile application lifecycle.
• Take ownership of the quality and maintainability of the code.
• Help ensure accessibility is considered throughout our approach, rather than treated as an afterthought.

This is a hands-on individual contributor role. You won't have line management responsibility, but you'll have a strong influence on how we build through technical leadership, pairing, code review, mentoring and the standards you help establish.

• Unblock other engineers and help the team work through complex technical problems.
• Make well-reasoned architectural decisions and communicate them clearly.
• Review pull requests and provide constructive feedback that improves quality and maintainability.
• Mentor and support other engineers through pairing, knowledge sharing and practical guidance.
• Identify anti-patterns, technical risks and opportunities to improve the codebase.
• Leave the codebase and the team in a better position than you found them.

We care more about how you think than which packages you've used, but this is the shape of the work.

• A Flutter monorepo — one app plus a set of internal packages.
• Layered Clean Architecture, enforced in CI.
• A design system built from Figma design tokens and catalogued in Widgetbook.
• A backend-for-frontend that drives parts of the UI, so screen composition can change without an app release.
• Git Hub Copilot for every engineer, with repo-level instructions and custom skills we've built to keep AI output aligned with our architecture and patterns.

You've shipped production mobile applications to real customers and understand what it takes to build, release and maintain software throughout its lifecycle.

Your Flutter experience might come from substantial production Flutter work, or from a strong native mobile background combined with significant Flutter projects.

• Strong understanding of mobile Dev Ops practices, including CI/CD pipelines, release management, and app store deployment processes.
• Advanced software engineering skills, including writing high-quality code, conducting thorough code reviews, and proactively identifying anti-patterns and maintainability risks.
• Comfortable using AI coding tools to work faster, with the judgement to know when to…