Senior Flutter Engineer in London

We are searching for an experienced Senior Flutter Engineer to work in a product centric role to help us on our mission of striving to make investing easier for all. We like winning awards, and we want you to help delight our users by creating award winning apps. 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.

What does the job involve?

• Working with product owners, product managers, UXD and other software engineers to architect solutions and write technical documents that identify software project requirements.
• You and your team will be responsible for an overall company goal, rather than building a specific feature.
• Write well-formulated, testable and readable code using appropriate software paradigms.
• Lead the evolution of development in the team, via pairing with others, reviewing pull requests, and advocating development standards to be followed by existing and new team members.
• Ensure accessibility is at the forefront of our approach.
• Mentor and develop junior team members.
• Build strong relationships across cross functional teams, particularly within the product, UXD teams.

Competence, knowledge and skills:

• 4+ years of professional experience in mobile application development.
• 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.
• Proven ability to diagnose, troubleshoot, and resolve defects across the mobile application lifecycle.
• Solid knowledge of Functional Reactive Programming (FRP) concepts and practical application in mobile architectures.
• Strong grasp of software architecture principles, with experience using the C4 model (or equivalent lightweight modelling techniques) to communicate and document designs.
• Experience developing and maintaining design systems, ensuring consistency, scalability, and reuse across mobile products.
• Exceptional attention to detail with a track record of translating ambiguous problems into effective solutions, including using rapid prototyping to validate ideas early.
• Clear, thoughtful communicator who values active listening and intentional collaboration across roles and disciplines.
• Comfortable working autonomously while also contributing effectively within cross-functional teams.
• Strong passion for mobile UX and building inclusive products, with working knowledge of accessibility best practices and relevant standards.
• High ownership and accountability, with a proactive mindset and strong initiative to identify and deliver high-impact improvements.

About AJ Bell:

AJ Bell is one of the UKs fastest-growing investment platform businesses, providing award-winning solutions for everyone, from professional financial advisers to first-time investors. Today, over 723,000 customers trust us to manage more than £108.7 billion of assets. By continually striving to make investing simpler and more accessible, we're helping more people take control of their financial futures. We're 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, there's an initial period of full-time office working to help you settle in and build relationships.

Inclusion & diversity:

We're 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.