Full-Stack Software Engineer, Ruby on Rails (m/f/d) at Solar Startup

About the role

At VREY , we're building the EnergyOS for multi-family buildings . Germany has over 3.3 million apartment buildings - and they are the blind spot of the energy transition. At the same time, regulation is forcing property owners into major investment: solar is becoming mandatory, smart meters must be rolled out nationwide within five years, heating and mobility are electrifying. The apartment building is transforming from passive real estate into an active part of the decentralised energy infrastructure. What's missing is an integrated system that makes this transition economically viable and operationally manageable. VREY combines certified meter operation with proprietary software , enabling property owners to sell self-generated solar power directly to their tenants - simply, and without having to become an energy supplier themselves (§42b EnWG). Regulatory obligation becomes a profitable, predictable opportunity: Double-digit returns and asset appreciation for owners, ~20% electricity cost savings for tenants, and digital infrastructure for storage, heat pumps, and flexibility. We already manage a three-digit number of projects - including some of Germany's largest property holders and housing cooperatives - in all 16 federal states. In the course of our seed financing, we raised €3.3M from leading impact and energy VCs (including Rubio Impact Ventures, HTGF, and Kopa Ventures). We're now entering the next growth phase and expanding our team. We're at the beginning of a structural market shift. Join us and help build the leading EnergyOS. Your Profile You have 2+ years of professional experience building and running full-stack web applications, ideally with Ruby on Rails . Experience in comparable frameworks (Django, Laravel, Spring Boot, NextJS) will also be considered, if you are truly motivated to learn and work with Rails. You have a strong understanding and hands-on experience designing and optimizing relational database schemas (we use PostgreSQL ). You are used to working with APIs and integrating with 3rd-party services. You have solid experience setting up and maintaining cloud/server infrastructure. We have a basic Heroku setup and Github CI/CD and need to gradually scale and improve monitoring etc. You have at least basic frontend development skills, ideally with solid fundamentals (HTML, CSS and JavaScript), as well as familiarity with both the Rails way (Hotwire, Turbo and Stimulus) and a framework like React or Vue. You are actively working with AI and pushing for efficient agentic setups; we are establishing Claude Code in the team and the whole company. You like to take ownership for the features and components you work on and you are proactive in the product development. You are excited about startups and want to make a real impact on the product and the company in a truely agile way. You are based in Berlin (or willing to relocate). You will enjoy working in our office in Friedrichshain with the team most of the time, with the flexibility of 1-2 remote work days a week. You are willing to learn energy industry terms in English and German and being comfortable with some parts of the company operating mostly in German. (Team language is English.) Nice to have: You have experience working with multi-tenancy systems and/or are experienced with payment provider integration (e.g., Stripe Connect)

Responsibilities

• You will be an early member of our growing product development team, working across the entire stack.
• While working on features and integrations, you also help us improve our infrastructure and backend processes, enabling our platform to scale.
• Full-stack feature development
• You co-design and build features across the full stack, from database to UI.
• You work directly with product management, design and internal users to get the details right.
• You ensure that our features perform well for a growing number of users.
• Data processing, automation and reliability
• You co-own the development of our crucial backend processes: importing and processing of smart meter measurement data and automated billing.
• You help designing and maintaining the underlying server infrastructure.
• You instrument, optimize and monitor critical processes so they remain fast, reliable and dependable as we scale.
• Technical design, architecture and engineering excellence
• You research, evaluate and design technical solutions to new problems together with the team.
• You contribute to our aspiration to get better and more efficient as engineers and as a team every day.
• You continuously improve our

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