Backend Developer (Django)

Job description

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. More customers, more connected heat pumps and more products relying on our backend mean the platform needs to grow with us. That's why we're looking for a Backend Developer to build and improve the Django platform behind our web application, customer app and employee app. It connects these products with our heat pumps, data platform and external partners. You'll spend most of your time writing code: improving reliability and performance, building new functionality and helping the platform scale with our customer base and installed fleet. 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 the connected intelligence behind DeWarmte—linking our heat pumps, digital products, internal systems and smart-home partners to make every installation smarter, more efficient and easier to use. You'll join the team behind backend systems that already support customers and heat pumps in the field. You'll get to know them deeply, keep them reliable and evolve their architecture as DeWarmte grows. Just as important: you'll help make sure knowledge and operational ownership are shared across the team. What you'll do Develop and improve our Django backend Work directly in the production Python/Django code behind our web application, customer app and employee app. Design, build, test and deploy new APIs, services and business logic, covering everything from the customer journey and planning to heat pump control and service. Improve performance, stability, security and data integrity. Diagnose and fix issues that span our backend, data platform and devices in the field. Connect and scale the platform Make sure our backend, databases and background processing keep up with a fast-growing customer base and installed fleet. Connect our backend with our heat pumps, data platform, web application, mobile apps, internal tools and smart-home platforms such as Homey, Home Assistant and HomeWizard. Define clear, well-documented interfa…