Senior Flutter Developer (£95k)

La Fosse; Greater London; On-site; GBP 70,000 - 90,000; Full time

Job summary

La Fosse is seeking a Senior Flutter Developer to join a high-performing engineering team in Greater London. You will build, evolve and optimise mobile apps and SDKs, blending Flutter expertise with native mobile skills to deliver high-quality experiences.

You will work with product managers, designers, QA and DevOps, drive automated testing, contribute to architecture decisions, and explore AI-assisted tooling to improve developer efficiency.

Qualifications

• 4+ years of commercial Flutter experience
• Strong understanding of modern architectural patterns (Clean Architecture, BLoC)
• Solid knowledge of Flutter widgets, testing (Widget Testing)
• Experience with TDD/BD within Flutter
• Experience using AI and agentic coding tools in the development lifecycle

Responsibilities

• Collaborate with team to meet product and engineering delivery objectives
• Participate in planning, technical discussions and day-to-day delivery
• Translate requirements into technical solutions and tasks
• Own code quality with automated tests and minimise defects
• Participate in code reviews to maintain high standards
• Identify opportunities to improve architecture, performance and developer experience

Skills

Flutter

Dart

Clean Architecture

State management

TDD/Testing

AI tools openaiAnthropic

Job description

We're looking for a Senior Flutter Developer to join a high-performing engineering team and play a key role in building, evolving and optimising modern mobile applications and SDKs.

You'll combine strong Flutter expertise with deep native mobile experience, working closely with engineers, product managers, designers, QA and DevOps to deliver high-quality experiences for customers.

This is a role for someone who enjoys solving complex technical problems, cares deeply about engineering quality and is excited by the evolving world of AI-assisted and agentic software development.

What you'll be doing

• Work collaboratively with your team to achieve shared product and engineering delivery objectives.
• Actively contribute to team ceremonies, planning, technical discussions and day-to-day delivery.
• Translate product and engineering requirements into clear technical solutions and implementation tasks.
• Take ownership of code quality, with strong automated test coverage and a focus on minimising defects.
• Participate in code reviews, helping maintain high engineering standards and consistent coding practices.
• Identify opportunities to improve technical processes, architecture, performance and developer experience.

What we're looking for

• 4+ years' commercial Flutter experience, with strong expertise writing testable and maintainable Dart.
• Extensive experience building production-grade Flutter applications and a strong understanding of modern architectural patterns, including Clean Architecture and BLoC/state management.
• Strong knowledge of Flutter widgets, frameworks and automated testing, including Widget Testing.
• Comfortable working with TDD, with an understanding of BDD within a Flutter environment.
• Experience using AI and agentic coding tools, such as Anthropic and OpenAI, as part of the software development lifecycle.

Nice to have

• Firebase SDKs, including Crashlytics and Remote Messaging.
• OneSignal.
• Server-Driven UI.
• Modern approaches to AI-assisted software engineering and developer tooling.

How you'll work

We're looking for someone who is proactive, collaborative and takes genuine ownership of their work. You'll be expected to contribute beyond simply writing code - helping shape technical decisions, improve ways of working and raise the engineering bar across the team.

You'll also need to be available throughout the working day, with occasional flexibility for early or late activities where required, and operate in line with the organisation’s values, policies and procedures.

If you're a senior mobile engineer who combines deep Flutter expertise with strong native experience and wants to work at the intersection of mobile engineering and AI, we'd love to hear from you.