The Role
The Senior Flutter Developer will build a B2B banking app, develop new features, participate in code reviews, and collaborate with cross-functional teams.
Summary Generated by Built In
About Unlimit
Unlimit is a global fintech ecosystem built to eliminate financial borders holding businesses back. The company provides the extensive infrastructure needed to scale globally, integrating payment processing, multi-currency business accounts, BaaS and crypto gateways into a single, intelligent platform.
Across 17 offices globally, Unlimit bridges hyper-local expertise with a high-capacity financial network, giving companies the agility to expand across regions with operational confidence and speed. Driving the evolution of payments, Unlimit is transforming its infrastructure from human-operated fintech into AI-native financial infrastructure — where APIs are consumed by machines, integrations are negotiated by agents, and systems evolve continuously through intelligent automation. Our next users are not only humans. They are AI agents acting on behalf of humans and businesses.
Unlimit serves more than the needs of businesses today; we are building the nervous system for a borderless global economy.
We are looking for an experienced Senior Flutter Developer to join our product team and build a brand-new B2B banking application for the European and Asian markets. Your role will be crucial in expanding functionality, and ensuring high product quality from day one.
We are looking for a Senior AI Agent Engineer with deep Flutter expertise to design and build the agentic backend layer powering Unlimit’s global financial platform.
You will not just write backend services. You will design AI agents that generate, operate, validate, monitor, and evolve backend services.
This role is for engineers who understand that the future of software is Human + AI co-creation, and soon — AI-to-AI collaboration.
What You'll Be Doing:
- Develop, plan and launch new features for our clients
- Automate development using AI tools and create AI Agents
- Participate in the Code Review process
- Use modern approaches, AI tools and technologies
- Interact with designers, project and product managers, developers, analysts and testers
Tech Stack:
- Flutter + Dart (null safety)
- Modular and clean architecture
- State management: Bloc (Cubit)
- Navigation: go_router
- Integrations: Firebase, APNS, Sentry
- Network: REST API, WebSocket
- Native code: platform channels, custom plugin development with Kotlin and Swift as needed
- CI/CD: Fastlane, GitLab CI
Qualifications You Bring:
- 4+ years of experience in mobile application development using Flutter
- Strong knowledge of Dart programming language and Flutter framework
- Strong AI-driven mindset and curiosity about emerging AI technologies.
- Hands-on experience using AI tools (e.g., LLMs, automation frameworks, AI-assisted development tools) to enhance productivity or system performance.
- Experience with integrating third-party libraries and APIs into mobile applications
- Strong understanding of software development principles, design patterns, and best practices
- Excellent problem-solving, analytical, and communication skills
- Ability to work independently and as part of a team in a fast-paced environment
Join Unlimit Team now!
Unlimit is an equal opportunity employer. We believe passionately that employing a diverse workforce is central to our success. We make recruiting decisions based on your experience and skills. We welcome applications from all members of society irrespective of age, sex, disability, sexual orientation, race, religion or belief.
Skills Required
- 4+ years of experience in mobile application development using Flutter
- Strong knowledge of Dart programming language and Flutter framework
- Experience with integrating third-party libraries and APIs into mobile applications
- Strong understanding of software development principles, design patterns, and best practices
- Excellent problem-solving, analytical, and communication skills
- Ability to work independently and as part of a team in a fast-paced environment
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The Company
What We Do
From London to Singapore and from San Francisco to São Paulo, we help businesses enter new markets, explore new industries, and reach new milestones. We are driven by a deep-seated determination to be the best possible partner for our customers – giving you the support you need to capitalize on a world that’s changing at breakneck speed. Our mission is to provide innovators with a convenient and simple financial interface that enables payments to flow freely and invisibly across borders. We offer a wide range of services, including payment gateway, card acquiring, business accounts, card issuing, alternative payment methods, and more. That’s the reason why we are called Unlimit: we provide unlimited growth opportunities for our customers, freeing them from the payment constraints. Unlimit - Borderless Payments
