Full-Stack Product Engineer, Ruby on Rails at Solar Startup

About the role

You'll be an early member of the growing product development team, working across the entire stack. Currently that's a straightforward Ruby on Rails app + PostgreSQL + Hotwire on Heroku which will be specialized and optimized as the company scales.

What you'll do

• Co-design and build features across the full stack, from database to UI
• Work directly with product management, design and users to get the details right
• Help raise the bar on frontend quality by contributing to a consistent design language, readable layouts and UI patterns
• Work on reliable and accurate processing of smart meter measurement data and build and maintain import pipelines and billing automation
• Help automate operational processes around project setup, metering data, contract management and billing
• Instrument, optimize and monitor critical processes so they remain fast, reliable and dependable as the company scales
• Research, evaluate and design technical solutions to new problems together with the engineering team
• Continuously improve the development environment and engineering processes, including adopting the right tools, workflows and AI-powered development practices

What you'll need

• 2+ years of professional experience building full-stack web applications, ideally with Ruby on Rails
• Strong frontend development skills with solid fundamentals (HTML, CSS and JavaScript), and familiarity with both the Rails way (Hotwire, Turbo and Stimulus) and a framework like React or Vue
• An eye for UI and UX — you know interface patterns, think from a user's point of view and have worked with design systems
• Solid hands-on experience designing and optimizing relational database schemas (PostgreSQL)
• Experience working with APIs and integrating with 3rd-party services
• Familiarity with cloud infrastructure — Heroku, AWS, or similar — including CI/CD pipelines and basic monitoring
• Actively working with AI and pushing for efficient agentic setups
• Based in Berlin or willing to relocate

Nice to have

• Willingness to learn energy industry terms in English and German and comfort with some parts of the company operating mostly in German

What they offer

• Competitive salary including shares based on level of experience
• Real ownership — shape VREY actively from day one with responsibility for tasks end-to-end
• Visible impact — ship features every day that make a difference for customers
• Personal and professional growth with skilled and experienced people to learn from
• Office in Berlin-Friedrichshain with free drinks, cereals, fruits, and plenty of lunch options nearby