App Developer (Flutter)

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About the role

At DeWarmte, we make smart, affordable heat pumps that help homes move away from gas. We design the hardware, software and services ourselves, so the quality of our software directly shapes how well our products work in people's homes. We're growing fast, and both apps need to grow with us. That's why we're looking for an App Developer to build and improve our two Flutter apps. Homeowners use the customer app to control their heat pump. Installers and service engineers use the employee app to install and maintain heat pumps in the field. You'll spend most of your time writing code: improving quality and reliability and shipping features to iOS and Android. Your work has a direct effect on comfort at home and on how efficiently our installation and service teams work. AI tools are already part of how we build software. We use them where they help us move faster, but we do not lower the bar: anything we ship still needs to be secure, maintainable and correct. You'll help us get better at both. Why this role matters Build reliable, intuitive apps that give customers confident control of their heat pump and help our installation and service teams do great work in the field. You'll join the team behind two apps used every day by customers, installers and service engineers. You'll get to know them deeply, keep them reliable and improve them as DeWarmte grows. Just as important: you'll help make sure knowledge and ownership are shared across the team. What you'll do Develop the DeWarmte apps • Build the features homeowners and installers to use and control heat pumps • Ensure that the DeWarmte apps stand out in the market with regards to usability functionality and innovation. • Make sure the app holds up in real-world conditions, like a basement with poor connectivity. Build a strong app platform • Work directly in the production Dart/Flutter codebases for iOS and Android. • Design, build, test and release new features, from first sketch to the App Store and Google Play. • Evolve app architecture, state management and shared components across both apps. • Work with our backend developers on clean, well-documented APIs. • Improve automated testing, CI/CD, crash reporting, analytics and release practices. • Diagnose and fix issues that span the apps, our Django backend and devices in the field. Build with AI • Use AI tools to support design, coding, testing, reviews and documentation. • Help the team improve its AI workflows, shared context and quality checks. • Try new tools, keep what works and share what you learn. • Hold AI-assisted code to the same standards as any other production code. Share ownership • Turn implicit knowledge into clear documentation, tooling and repeatable engineering practices. • Write code that other engineers can easily understand, test and safely change. • Take part in code reviews and technical decision-making. Work across the company This role reaches beyond app development. You'll work with colleagues in product, backend, hardware, controls, installation and service—and listen closely to customers—to solve today's issues without compromising the apps for tomorrow. What success looks like In your first few months • You understand both apps, how they connect to our backend and heat pumps, and where the risks are. • You can independently build, debug and release changes to both apps through the team's review and release practices. • The most important technical debt and quality issues are visible and prioritised. As the role develops • New features ship predictably, safely and with good test coverage. • Customers trust the app to control their heat pump: crash rates go down and app store ratings go up. • Thanks to the employee app, installations and service visits are faster and

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