Senior Flutter Engineer

We are searching for an experienced Senior Flutter Engineer to work in a product centric role helping us bring feel good investing to life. You will help build the Flutter app that is replacing our long-standing native iOS and Android apps serving a D2C business of over 500000 customers a large proportion of whom manage their investments through the app. You will put users at the forefront of the way you think and be passionate about great user experience and user interface design. You will be able to deliver tested resilient and performant code against a fast-paced environment. Your role will be pivotal in helping us achieve our mission by developing shaping and iterating our customer facing Flutter applications. We work hybrid with at least 50% of your time in the office.

What does the job involve

This is a hands-on individual contributor role in a cross functional team. You wont line-manage but you will have a strong influence on how the team builds through pairing code review mentoring and the technical standards you set.

• Architect solutions with your team and write the technical documents that define what were building.
• Write well-formulated testable and readable code using appropriate software paradigms.
• Multiply the teams output unblock others make the difficult architectural calls and leave the codebase easier to work in than you found it.
• Ensure accessibility is at the forefront of our approach.
• Mentor and develop others in the team through pairing reviewing pull requests and advocating development standards to be followed by existing and new team members.

How we build

We care more about how you think than which packages youve 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.
• GitHub Copilot for every engineer with repo-level instructions and custom skills weve built to keep AI output aligned with our architecture and patterns.

Competence knowledge and skills

Technical skills

Youve shipped production mobile apps to real customers through full app store release cycles and youre the engineer others turn to for architecture decisions and code review. Your Flutter experience might come from production work or from a strong native background plus substantial Flutter projects.

• Strong understanding of mobile DevOps 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 rely on them and when not to. You own the code you ship however it was produced.
• Proven ability to diagnose troubleshoot and resolve defects across the mobile application lifecycle.
• Solid knowledge of reactive state management patterns and how to apply them in mobile architectures.
• Strong grasp of software architecture principles with the ability to communicate and document designs clearly for both technical and non-technical audiences.
• Experience building products on top of a design system consuming and extending shared components rather than reinventing them and knowing when something belongs in the shared library rather than in your feature.

How you work

• Strong passion for mobile UX and building inclusive products with working knowledge of accessibility best practices and relevant standards.
• A clear communicator who listens well and collaborates deliberately across product design and engineering comfortable working autonomously and equally comfortable inside a cross-functional team.
• High ownership: you turn ambiguous problems into shipped solutions prototyping early to validate ideas and take the initiative on improvements rather than waiting to be asked.

Nice to have

• Native Android (Kotlin) or iOS (Swift) experience. Our legacy native apps are still live and a native background helps when working out what existing behaviour we need to carry across.
• Experience working in finance investing or another regulated domain.
• Experience with backend-for-frontend architectures where the backend shapes what the app renders.
• Experience building or owning a design system or shared component library.

About us:

At AJ Bell we believe investing should feel good. Whether youre looking for an ISA pension or dealing account whether you want to invest with the help of a financial adviser or do it yourself we have easy-to-use solutions to suit people from all walks of life.

Were one of the UKs fastest-growing investment platform businesses trusted by everyone from professional financial advisers to first-time investors.

Today over 762000 customers trust us to manage more than 121.5 billion of assets. By continually striving to make investing simpler and more accessible were helping more people take control of their financial futures.

Were proud to be recognised as one of the UKs Best 100 Companies to Work For for six consecutive years and a Great Place to Work in 2025 and 2026 a reflection of our supportive and collaborative culture.

What we offer

• 26 days holiday increasing with service buy/sell scheme bank holidays
• 7% Pension with matched contributions
• Discretionary bonus scheme
• Share schemes (including free shares and BAYE)
• Health Cash Plan and discounted private healthcare
• Free onsite gym
• Enhanced family leave (subject to qualifying criteria)
• Travel and bike loan schemes
• Employee Assistance Programme

Life at AJ Bell

• Regular social events including summer and Christmas parties
• Learning and development opportunities tailored to you
• Casual dress code
• Friendly supportive team environment

Our ways of working

We offer hybrid working with a minimum of 50% of your working time per month spent in the office. For new starters theres an initial period of full-time office working to help you settle in and build relationships.

Inclusion & diversity

Were committed to creating an inclusive environment where everyone feels respected and able to be themselves at work. We welcome applications from all backgrounds and make hiring decisions based on skills experience and potential.

Remote Work :

No

Employment Type :

Full-time