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

At VREY , we’re finally bringing solar energy to over 3 million multi-family buildings in Germany by developing the Energy OS for apartment buildings . We support property owners as implementation partners and software providers for the new model of "shared building supply," made possible by the German government's “Solarpaket 1” in 2024 .

Our mission is to make photovoltaic systems (PV) economically attractive and easy to implement . Future product developments will also seamlessly integrate battery storage, heat pumps, and EV wallboxes into multi-family buildings.

Tasks

As a Full-Stack Software Engineer, you are an early member of our growing product development team, working closely alongside our experienced Head of Engineering. You contribute across the entire software stack ( backend, frontend, database, data import, infrastructure , etc.) and actively shape the team and our platform.

The core functionality of the VREY platform is processing smart meter measurement data for analyzing and billing solar power usage. For this purpose, we provide landlords and tenants with a portal and automate billing and payment flows in the background. Through our admin interface, we enable the creation and management of projects. Future ideas include applications for tenants and installers, or intelligent real-time control based on short-term electricity prices.

Currently, the technical stack primarily consists of a Ruby on Rails app, which we might expand with frontend technologies (e.g., React) and services as needed. For payments, we integrate the Stripe API.

Your responsibilities will include:

• Feature Development: Collaborate within our agile product team to build and test new features across the stack — sometimes directly with business team members.
• Technical Design: Research and design technical solutions to new challenges together with the Head of Engineering.
• Performance Optimization and Process Automation: Our platform automates data imports and billing processes — you’ll help ensure these systems run efficiently and reliably.
• Infrastructure: Support infrastructure decisions and ensure smooth operation of cloud components.

Requirements

Your Profile

• 2+ years of professional experience building full-stack web applications.
• Practical skills in Ruby on Rails — alternatively with similar MVC frameworks such as Laravel/PHP, Django/Python, NestJS/TypeScript, or Java/SpringBoot.
• Solid knowledge and hands-on experience designing and optimizing relational database models (we use PostgreSQL).
• Strong understanding of web architectures and technologies such as JavaScript, React/Vue, and REST APIs, HTML/CSS , etc.
• Experience with cloud infrastructure (e.g., AWS, S3, CI/CD, Infrastructure as Code, monitoring tools).

About You

• You’re excited about startups , eager to make a real impact, able to also work independently, ready to take ownership for tasks and projects, and love to learn new things.
• You’re a team player and enjoy regularly working on-site at our Berlin-Friedrichshain office (occational remote work possible upon individual agreement).
• You’re willing to learn energy industry terms in German and English, and ideally, you have good German language skills .

Benefits

• Appropriate salary based on your skills and experience and the opportunity to progress your carreer with the growth of the company , including earning shares in the near future.
• Coaching and mentoring by our Head of Engineering with over 10 years of experience as software engineer and team lead in startups, and as volunteer and professional coach and mentor.
• The opportunity to define and pursue personal development goals together.
• Work on business-critical tasks from the start and the chance to be part of the company-building journey from the ground up.
• Office at a cool co-working space including free drinks, muesli, fruit, and lot of great lunch options around.

If you're ready for a challenging and rewarding role , we’d love to receive your application and get to know you.

At VREY, we believe that diversity strengthens both our company and society . We do not make hiring or employment decisions based on skin color, religion, ethnicity, nationality, gender identity, sexual orientation, disability, or age. VREY is committed to maintaining a safe and respectful workplace, free from discrimination and harassment of any kind.