Senior Full Stack Developer (m/f/d) HeatOS

Your mission

At Vamo, our mission is to bring the new era of heating into the home. To achieve this, we connect modern, efficient, and environmentally friendly heat pumps across Germany with our HeatFleet and the Vamo App for end customers.

To make these processes efficient and scalable, our HeatOS team focuses on digitally mapping and automating all internal business processes – from lead management and sales to planning, operations, and installation.

As a Senior Full Stack Developer in the HeatOS team, you take full ownership of the system’s architecture and implementation. You work hands-on, make key technical decisions, and actively shape the foundation on which our growth and processes will remain efficient, robust, and future-proof.

• Development & Implementation: You lead the conception, development, and implementation of new, complex features for our website and other business processes. This ranges from architectural design in the backend (Node.js) to leading the implementation in the frontend (Vue.js), setting and executing technical guidelines.
• API Design: You are primarily responsible for the design, standardization, and implementation of robust, highly scalable, and future-proof APIs. These serve as the central communication interface for our website and CRM, as well as for connecting partner systems.
• Code Quality & Testing: You establish and monitor high standards for code quality, maintainability, and test coverage (unit & integration tests) within the team. This includes defining code conventions, conducting code reviews, and mentoring other developers for continuous improvement of development quality.
• Infrastructure & Deployment: You proactively help shape the architecture of our CI/CD pipeline and infrastructure. This involves optimizing and further developing our environments using technologies like Docker, Heroku, and MongoDB to ensure efficient, reliable, and automated deployment.
• Team Collaboration: You are part of the interdisciplinary development team and work closely with Product Managers, Developers, and other stakeholders. You are responsible for the technical analysis of requirements and translating them into outstanding, feasible technical solutions.
• Technological Vision & Innovation: You proactively identify new technologies, architectures, and best practices and drive their evaluation and introduction. Your goal is to continuously improve our platform, future-proof it, and achieve a strategic advantage through technological excellence.

Your profile

Experience:
You have several years of practical experience in full-stack development, ideally in an agile startup environment as a Lead or most experienced developer on a team.

Tech Stack:

• Profound knowledge of Node.js and TypeScript for backend development (we use Nest.js for our backend services).
• Proficiency with Vue.js or another modern JavaScript framework (e.g., React, Angular).
• Experience with NoSQL databases, particularly MongoDB.
• Practical experience with containerization (Docker) and deployment platforms (Heroku).

• You understand how technology contributes to business goals and can integrate technology, user needs, and business objectives into your decisions.
• A good understanding of modern software architecture, API design, and best practices in web development. Experience with Low- and No-Code tools is a plus.
• A proactive, solution-oriented work approach and the ability to quickly grasp new topics.
• You are a team player with excellent communication skills who can communicate complex matters to both technical and non-technical colleagues.
• Enthusiasm for clean code, technology, and innovative products in the climate tech sector.
• Experience in website, lead funnel, conversion optimization, and collaboration with Sales and Marketing implementations.
• Confident use of AI-powered development tools (e.g., GitHub Copilot, Gemini) to increase productivity and code quality.

• Fluent in spoken and written English. German language skills are a plus
• A valid EU work visa

Why us?

Your Tech Stack. Our Impact.
With us, you are right at the heart of the heating transition and help create real impact with your technical know-how. Work hand-in-hand with passionate colleagues from trade, tech, and business. We rely on open communication and flat hierarchies to achieve our goal: climate-friendly heating for everyone.

Your Career. Our Growth.
We give you the tools, the freedom, and the responsibility to grow with us – both personally and professionally. This includes access to GoodHabitz courses and other learning opportunities designed to advance your skills and personal development. Experience the dynamics of a tech startup and build your career in a market that is changing the world. You are the driving force that transforms ideas from the first concept into tangible solutions.

Work-Life Balance 2.0.
We are fast-paced, ambitious, and direct. At the same time, we offer the freedom and individual responsibility you need to best combine your professional and personal life. We prove this with 30 days of vacation, the option to work from home, and flexible working hours.

Real Depth. No Buzzwords.
We focus on deep technical and economic expertise. You will work in a highly qualified and motivated team that passionately seeks the best solutions.

Our Flexibility. Your Choice.
You decide where you work: 100% remote or in our modern office in Cologne. We ensure that you feel comfortable everywhere and always remain part of the team. Regular virtual events and in-person meetings in Cologne strengthen our team spirit and cohesion.

More Benefits. More for You.
We take a holistic approach to benefits: Stay mobile and sustainable with our "JobRad" bike leasing. Additionally, you will receive a monthly tax-free benefit of €50 via the "Guudcard", which you can use flexibly – for example, for Urban Sports Club, the "Deutschlandticket", or other sustainable products and services. Our offer is rounded off by a company pension scheme (bAV) with employer contributions, ensuring you are well-protected in the long term.

About us

We are a young heat pump technology company from Cologne. With a great mix of young and old and a modern, open team culture, we make craftsmanship sexy and rely on the best and most ambitious talents! While others continue to ride the dead horses of gas and oil heating, or dream of hydrogen and district heating, we focus 100% on heat pump technology.

Our goal is to make green heating feasible & affordable for everyone. We offer our customers an all-round carefree package for their heating system change, from the application for funding to installation and subsequent support during operation. Best of all, our subscription model eliminates the purchase costs and risks of buying!

All Vamo heat pumps are digitally networked in real time. This allows us to respond to malfunctions before they occur. And: we can remotely control the systems so that our customers have minimal electricity costs. The intelligent interaction of all heat pumps in our fleet also helps to keep our electricity grid stable.

Together with you, we want to digitalize the trade and make it more attractive for young people and thus help the heat and energy transition in Germany to achieve a breakthrough.

Heat your home, not the planet!