Flutter Engineer (Remote from Europe)
Quona Capital
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Benefits offered by this job
Job summary
Klar is seeking a Senior Flutter Engineer to join its mobile engineering team. You will own complex features across Android, iOS, and Web within a large monorepo, driving architecture decisions and high-quality delivery.
The role emphasizes AI-first development, coding agents, and tooling to improve engineering workflows, with mentorship for colleagues and strong emphasis on performance and reliability. Join a diverse, international team spanning Mexico City, Berlin, and Argentina, and
Qualifications
- Strong experience building and maintaining complex Flutter applications in production.
- Deep knowledge of Dart and Flutter, including async programming and widget lifecycle.
- Experience with state management using BLoC/Cubit.
- Ability to integrate with APIs and handle data and errors robustly.
- Proven testing approach across unit, widget, and integration tests.
- Excellent communication and willingness to mentor teammates.
Responsibilities
- Own complex features from design through release with cross-functional teams.
- Shape new projects and improve existing applications.
- Make architecture decisions to keep the Flutter codebase maintainable.
- Investigate performance, reliability, and cross-platform issues.
- Build tests and automated checks for safe, frequent releases.
- Create and improve AI workflows for coding tasks and reviews.
- Configure agent harnesses and tool integrations for the codebase.
- Evaluate new AI methods and share approaches to improve quality.
Skills
Tools
Job description
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.
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!
We value ownership, thoughtful engineering, clear communication, and a focus on our customers. We share responsibility for our successes and mistakes, help each other improve, and work to create an inclusive and respectful environment.
- 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.
You’ll join Klar’s mobile engineering team as a Senior Flutter Engineer, working on a shared codebase that powers applications across Android, iOS, and Web. Our monorepo includes multiple apps, more than 2 millions lines of code and more around 00 modules, with challenges in architecture, performance, testing, and developer experience.
We’re looking for someone with deep Flutter expertise who actively finds better ways to work with AI. You should be comfortable owning complex features, making architecture decisions, and solving difficult production problems.
AI-first development is a core part of this role. You’ll help build the systems around coding agents: the context they receive, the tools they use, the permissions they have, and the checks that validate their work. You’ll turn useful experiments into reliable workflows that other engineers can use.
Your Flutter expertise and engineering judgment will guide this work. You’ll be responsible for understanding, reviewing, and validating what ships.
- Own complex features from technical design through release, working with designers, product managers, and backend engineers.
- Help shape new projects and improve existing applications.
- Make architecture decisions that keep our Flutter codebase maintainable as it grows.
- Investigate and resolve performance, reliability, and cross-platform issues.
- Build tests and automated checks that support safe, frequent releases.
- Create and improve AI workflows for exploration, implementation, refactoring, debugging, testing, and code review.
- Configure agent harnesses, project instructions, reusable skills, and tool integrations for our codebase.
- Evaluate new AI methods and share approaches that improve engineering quality and delivery.
- Support other engineers through mentoring, code reviews, and technical discussions
- Strong experience building and maintaining complex Flutter applications in production, with ownership of technical decisions and delivery.
- Deep knowledge of Dart and Flutter, including asynchronous programming, widget lifecycle, rendering, and performance.
- Experience with state management and modular application architecture. We use BLoC and Cubit.
- A strong understanding of API integration, data handling, and error recovery.
- The ability to investigate difficult bugs, explain technical tradeoffs, and work through unclear requirements.
- A practical testing approach, with experience choosing the right tests for important application behavior.
- Clear communication and the ability to help other engineers make good technical decisions.
- Practical experience using coding agents for complex engineering work.
- An understanding of agent harnesses, including context management, tool use, planning and execution, permissions, and feedback loops.
- Experience setting up or extending reusable AI workflows for a large codebase.
- The ability to review generated code critically, catch incorrect assumptions, and validate results.
- An active interest in testing new models, tools, and methods and incorporating useful approaches into your daily work.
- Good judgment about where AI helps, where it needs closer guidance, and when to solve a problem directly.
Our Flutter monorepo uses a feature-based modular structure. We use automated checks, static analysis, and CI/CD to support development and releases.
Our testing includes unit, widget, integration, screenshot, and end-to-end tests. Engineers contribute to both product development and improvements to our tools and workflows.
- Flutter Web or native Android/iOS development.
- Design systems, reusable UI components, and accessibility.
- Payments, authentication, secure storage, biometrics, deep links, or push notifications.
- Firebase, application monitoring, and performance analysis.
- CI/CD with GitHub Actions or monorepo tooling such as Melos.
- Custom agent tools, MCP integrations, or shared agent configurations.
- Evaluating the quality and reliability of different models and AI workflows.
- 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
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!
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