Senior Full Stack Engineer (f/m/d)

We're looking for

At thermondo, our mission is to decarbonize every home, and technology is our primary lever for change.We are disrupting a massive industry bogged down by legacy systems and manual work. This is where you come in. We build the intelligent software and automation that gives us a decisive edge, allowing us to operate at a scale and efficiency our competitors can't match.As a Senior Engineer, you will architect the foundational systems that power this mission. Whether you’re building AI-powered tools to help customers find the perfect clean-energy solution, developing automation that gives our operational teams superpowers, or optimizing the algorithms that make thousands of homes more efficient, your code will directly accelerate the green energy transition.We’re looking for a seasoned builder who is ready to leverage modern Cloud and AI to solve one of the most pressing challenges of our time. If you thrive on turning complex problems into elegant solutions and want to build technology that truly matters, join us.

If you enjoy this

• Own features from concept to deployment. As a technical leader, you'll partner closely with Product and Design to shape the roadmap, architect robust solutions, and guide a pod of engineers to deliver high-impact features across our full stack (Python, Node.js, TypeScript, and Vue.js).
• Design and build scalable, resilient systems. This is a hands-on coding role. You'll solve complex problems with maintainable, performant, and secure code, applying best practices like TDD, SOLID principles, and Clean Code to create solutions built to last.
• Pioneer AI Engineering at thermondo. You will be instrumental in identifying opportunities to leverage AI, from building internal "superpowers" with LLMs to creating intelligent, customer-facing features. You'll lead the charge from prototype to production.
• Champion a "You Build It, You Run It" culture. You'll take full ownership of the systems your team builds, ensuring they are scalable, observable, and resilient. You'll improve our CI/CD pipelines and advocate for testing best practices.
• Elevate the team's technical bar. Through mentorship, insightful code reviews, and pragmatic architectural decisions, you will level up the engineers around you and help them grow their craft.

And recognise yourself here

• You're a seasoned full-stack engineer with at least 6 years of professional software development experience. You have a proven track record of shipping complex web applications and your expertise spans both backend (Python and/or Node.js) and modern frontend frameworks (Vue.js with TypeScript or similar).
• A natural leader and owner. You have experience acting as a Tech Lead, Feature Lead, or Directly Responsible Individual (DRI). You thrive in roles where you can take a high-level goal, break it down, and rally a team to execute.
• A product-minded builder. You don't just write code; you solve customer problems. You're a true partner to product managers, using your technical insight to influence what gets built and why.
• Pragmatic and execution-focused. You have the veteran experience to know which corners can be cut and which can't. You balance the need for speed with the importance of quality, making smart tradeoffs to deliver value iteratively.
  Bonus Points
• Hands-on experience with AI/ML. You have practical experience building and deploying features powered by machine learning models or large language models (LLMs).
• Deep cloud and infrastructure knowledge. You're comfortable with cloud platforms like AWS or GCP and have experience with infrastructure-as-code (e.g., Terraform) and container orchestration (e.g., Kubernetes).
• Proven success in a high-growth startup. You've been through the scaling journey before and know how to build systems that can withstand rapid growth.
• A passion for climate tech. You're motivated by our mission to decarbonize homes and are excited to apply your skills to a problem that matters.

What we have to offer

• Join a team of Product Managers, Software Engineers, Designers, Data and Salesforce people who are excellent in their craft and are happy to share their knowledge and help you grow alongside them
• Our team is using the latest frameworks and is working with a modern tech stack to build powerful products for our customers, craftspeople, and internal teams
• We offer a challenge with purpose - the better our tech, the more people will live climate-neutral and the better the world becomes for future generations
• We offer a fantastic culture in the tech team and beyond
  • Modern office in the heart of Berlin
  • You can bring your dog one day/week
  • Work from home - up to 3 days a week
  • You can lease a job bike
  • You receive an Urban Sports Club membership
  • Corporate Benefits at more than 100 partners
  • nilo.health membership
  • 20% employer contribution to your pension and disability insurance

About us

Every application is welcome here - regardless of gender, nationality, ethnic and social background, religion, ideology, disability, age, sexual orientation or identity. We are convinced that everyone is valuable and deserves a fair chance.

Software has always been part of thermondo’s DNA. We have been the first to digitize trade a decade ago. Today, our proprietary software enables 1000 thermondinos to scale the heating transition in Germany. But we want more. We want to enable fully digitized and smooth customer journey ensuring that all processes are coming together: commercial funnel, procurement, product, supply chain, project management, finance, dispatch, HR planning as well as customer facing offerings for maintenance and home energy management.
Our product & tech teams in Xberg - the heart of Berlin - are a highly diverse and multicultural bunch. They make sure that we can make a difference and scale the energy transition in Germany and work closely together with all departments.

Join our product & tech teams and pave the way for climate neutral living.

Your application process

• An initial interview with your Talent Acquisition partner, Alex
• If we are both on the positive side, you will talk to our VP of Engineering Pedro
• After this stage, you will undergo some technical assessments
• Then, you will have the opportunity to meet with your to-be teammates.
• Finally, Become a thermondino!

Here we go

Is this exactly the challenge you are looking for? Then don't wait any longer and apply to us. We look forward to getting to know you!