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

VREY; Berlin; Vor Ort; EUR 50.000 - 70.000; Vollzeit

Benefits dieser Stelle

Competitive salary including shares

Ownership in projects

Personal and professional growth opportunities

Great workplace in co-working space with free snacks

Zusammenfassung

VREY is seeking a Full-Stack Developer in Berlin to build innovative solutions for multi-family buildings, focusing on energy management. The role involves co-designing features, processing smart meter data, and improving technical efficiency.

Ideal candidates have 2+ years of experience, strong knowledge in Ruby on Rails, and a passion for startups. Competitive salary and real ownership await.

Qualifikationen

• 2+ years of professional experience in full-stack web applications.
• Strong frontend development skills with foundational knowledge.
• Experience with APIs and cloud infrastructure.

Aufgaben

• Co-design and build features across the full stack.
• Ensure reliable processing of smart meter data.
• Research and design technical solutions with the team.

Kenntnisse

Ruby on Rails

HTML, CSS, JavaScript

Frontend frameworks (React, Vue)

UI and UX design knowledge

PostgreSQL

API Integration

Cloud infrastructure (Heroku, AWS)

Working with AI

Startup environment experience

Jobbeschreibung

About Us

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. <1% solar penetration. <2% smart metering. Almost no flexibility or intelligent energy management.

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 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 strong frontend development skills, ideally with solid fundamentals (HTML, CSS and JavaScript), as well as familiarity with the Rails-specific frontend technology (Hotwire, Turbo and Stimulus) and a framework like React or Vue.
• You have an eye for UI and UX - you know interface patterns, think from a user's point of view and have worked with design systems.
• You have solid 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 are familiar with cloud infrastructure - Heroku, AWS, or similar - including CI/CD pipelines and basic monitoring.
• 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 truly agile way.
• You are based in Berlin (or willing to relocate). Our office in Friedrichshain is our home base, with occasional remote days by arrangement.
• 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.)

Your Responsibilities

1. Full-stack feature development and UI quality

• You co-design and build features across the full stack, from database to UI
• You work directly with product management, design and users to get the details right.
• You help raise the bar on frontend quality by contributing to a consistent design language, readable layouts and UI patterns that scale across the product without becoming messy

2. Data processing, automation and reliability

• You work on the core of our platform - reliable and accurate processing of smart meter measurement data - and build and maintain import pipelines and billing automation that run this.
• You help automate operational processes around project setup, metering data, contract management and billing
• You instrument, optimize and monitor critical processes so they remain fast, reliable and dependable as we scale

3. Technical design, architecture and engineering excellence

• You research, evaluate and design technical solutions to new problems together with the engineering team
• You contribute to our aspiration to get better and more efficient as engineers and as a team every day
• You continuously improve our development environment and engineering processes, including adopting the right tools, workflows and AI-powered development practices

Benefits

• Competitive salary including shares based on the level of your experience
• Real ownership — You shape VREY actively from day one. Ownership means responsibility for your tasks end-to-end and the opportunity to take leadership.
• Visible impact — We ship features every day that make a difference for our customers and colleagues.
• Personal and professional growth — We have very skilled and experienced people on the team that you can learn from and we actively provide opportunities to develop your career.
• Making a difference — Our daily work reduces energy costs for tenants, advances the energy transition in residential buildings, and accelerates the economic decarbonisation of Germany's housing stock.
• Great workplace — Office in a cool co-working space in Berlin-Friedrichshain, with free drinks, cerials, fruits, and plenty of lunch options nearby.

At VREY, we believe that diversity strengthens both our company and society. We do not make hiring or employment decisions based on race, religion, ethnicity, nationality, gender identity, sexual orientation, disability, or age.

Even if you don't meet every requirement, don't hesitate to apply. If you're excited about our mission and believe you can contribute, we want to hear from you!