Senior Flutter Engineer (Remote from EU only)

About Klar

We're turning one of the world's largest underbanked markets into something fairer, simpler, and more transparent. 7 million users served since 2019. Uber's first global credit card, built right here in Mexico and Berlin. Klar Empresarial, a brand-new B2B solution bringing agile credit and smart accounts to SMEs who've been ignored by traditional banks for too long. 

And a full banking license on the horizon, because our customers asked for it and we listened.

We move fast, we think big, and we go all in, because as our CEO puts it: "Growing doesn't always mean going further. Sometimes it means going deeper."

Behind all of it is a team of 30+ nationalities, working across Mexico City, Berlin, and Argentina, obsessed with building financial products that are simpler, faster, and fairer than anything that came before.

This is Klar, and we're seeking the people who'll write the next chapter.

Our people

If you join us at Klar, you’ll be welcomed to a team that is rich in many talents and we are very proud! With our head office in Mexico City, and remote tech hubs in Berlin and Argentina, we are always learning something new about another culture or language. With so many people from different backgrounds and walks of life (young professionals, parents, LGBTQ+, neurodivergence), you’ll definitely find your people here! 

Our values

• Ownership - We own our successes & our failures as a team.
• Excellence - We do everything to the best of our ability & always seek to achieve a new level of excellence in our work.
• Inclusion - We believe we are stronger together and actively work to promote a safe, diverse, inclusive, and respectful culture.
• Customer Obsession - We understand the value Klar can bring to its customers & it’s always at the forefront of our decisions.
• Klarity - We communicate clearly & with authenticity. It’s in our name & it’s what we do.

About the role

You will join Klar’s mobile development team as a Flutter Engineer working on a cross-platform codebase that powers multiple apps across Android, iOS, and Web. This role is central to advancing Klar’s mobile experience and scaling

You will work closely with designers, product managers, and backend engineers to deliver a secure, responsive, and delightful experience for users across platforms. This is a great opportunity to shape high-performance mobile and web applications with deep integrations across the product, analytics, and infrastructure stack.

We expect engineers to use AI as an integral part of the development workflow and to continuously improve how agents, tools, and automation are used to increase engineering quality and velocity.

The role is fully remote from EU.

Here are some development practices we follow, to give you an idea of how we work:

• Monorepo with few apps and 400+ modules
• Feature-based modular design
• Comprehensive testing experience (unit, widget, integration, E2E tests)
• Git workflow proficiency with branch management and PR processes
• Code quality tools and static analysis
• Continuous Integration and Continuous Delivery
• Custom Gherkin-like testing framework
• Automated screenshot testing
• E2E test automation

What we are looking for:

• 5+ years of Flutter development experience
• Strong Dart programming fundamentals
• Experience with complex state management in large applications
• API integration and data handling expertise
• Testing mindset with experience in multiple testing approaches
• Problem-solving abilities for complex technical challenges
• Code quality focus with clean, maintainable code practices
• Team collaboration in code reviews and technical discussions
• Learning agility to adapt to new technologies and frameworks

Core Technical Requirements:

• Flutter & Dart Expertise
• Flutter 3.27.3+ and Dart 3.10.0+ proficiency
• Strong experience with BLoC pattern and Cubit for state management
• Understanding of clean architecture principles
• Performance optimization and monitoring
• Strong understanding of AI coding agents and agent harnesses, including context management, tool use, planning/execution loops, and permissions.
• Ability to set up, configure, and tune coding agents for large codebases using project instructions, rules, skills, tools, and reusable workflows.
• Experience using AI effectively across the software development lifecycle: exploration, implementation, refactoring, testing, debugging, code review, and documentation.
• Ability to design AI workflows that produce reliable, repeatable results rather than relying on one-off prompts.

Valuable Experience:

• Flutter for Web development
• Firebase integration (Analytics, Crashlytics, Performance, Auth, Remote Config, etc)
• CI/CD understanding (GitHub Actions preferred)
• Monorepo management with tools like Melos
• Custom UI components and design system implementation
• Platform-specific integrations (biometrics, deep linking, push notifications)
• Payment systems integration (3DS, wallet providers)
• Marketing Platforms (AppsFlyer, Meta Pixel, Google Tag Manager)
• Security implementations (cryptography, MFA, secure storage)
• Familiarity with BigQuery
• Web development background
• Native Mobile development background
• Building custom agents, subagents, or reusable AI skills/workflows.
• MCP or similar tool-integration protocols.
• Creating repository-level AI conventions and shared agent configurations.
• Evaluating agent performance across different models and workflows.

Our offer to you

• Competitive salary based on performance and experience
• Chance of earning Klar stock options
• 26 days of paid vacation per year
• Computer devices
• Wellhub subscription to offer mental and physical health
• Sponsored coaching and therapy sessions via Mantra Care
• International work environment with amazing and highly skilled people
• A world class team that helps you evolve your skills in areas you're interested in

Klar is a safe place for everyone!

We trust our highly skilled and diverse team and we’re committed to creating a welcoming and inclusive environment for new talents to flourish. We value diversity and welcome all applications regardless of gender, nationality, ethnic and social origin, religion/belief, physical abilities, age, sexual orientation and identity.

Should you require any accommodations through the recruitment process, please don’t hesitate to let us know how we can help!