(Senior) Product Engineer - Heartbeat (m/f/d)

<h2>1KOMMA5°</h2> <span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);display:inline;">At </span><span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;"><strong style="border:0px solid;margin:0px;font-weight:600;font-family:Inter, '-apple-system', 'system-ui', 'Segoe UI', Roboto, 'Helvetica Neue', 'Open Sans', 'system-ui', '-apple-system', 'Segoe UI', Roboto, Ubuntu, Cantarell, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';font-size:14px;font-style:normal;text-transform:none;background-color:rgb(255,255,255);">1KOMMA5°</strong></span><span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);display:inline;">, we pursue a clear vision: </span><span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;"><strong style="border:0px solid;margin:0px;font-weight:600;font-family:Inter, '-apple-system', 'system-ui', 'Segoe UI', Roboto, 'Helvetica Neue', 'Open Sans', 'system-ui', '-apple-system', 'Segoe UI', Roboto, Ubuntu, Cantarell, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';font-size:14px;font-style:normal;text-transform:none;background-color:rgb(255,255,255);">Living on wind and sunlight forever for free</strong></span><span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);display:inline;">. To make this a reality, we are building the energy system of the future with Heartbeat AI. Want to be part of it?</span><span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;"><br style="border:0px solid;margin:0px;font-family:Inter, '-apple-system', 'system-ui', 'Segoe UI', Roboto, 'Helvetica Neue', 'Open Sans', 'system-ui', '-apple-system', 'Segoe UI', Roboto, Ubuntu, Cantarell, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);"><br style="border:0px solid;margin:0px;font-family:Inter, '-apple-system', 'system-ui', 'Segoe UI', Roboto, 'Helvetica Neue', 'Open Sans', 'system-ui', '-apple-system', 'Segoe UI', Roboto, Ubuntu, Cantarell, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);"></span><span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);display:inline;">We bring together regional craftsmanship and scalable software: We don't think of solar, batteries, heat pumps, and e-mobility as isolated components, but control them as an intelligent, integrated overall system in our virtual power plant. Directly connected to the electricity market – in real time, fully automated. This way, energy is used when it is available from renewables and particularly cost-effective. By 2030, our goal is to transition 1.5 million households to renewable energies. Over 3,000 people are working towards this every day, at more than 80 locations worldwide, from Finland to Australia.</span><span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;"><br style="border:0px solid;margin:0px;font-family:Inter, '-apple-system', 'system-ui', 'Segoe UI', Roboto, 'Helvetica Neue', 'Open Sans', 'system-ui', '-apple-system', 'Segoe UI', Roboto, Ubuntu, Cantarell, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);"><br style="border:0px solid;margin:0px;font-family:Inter, '-apple-system', 'system-ui', 'Segoe UI', Roboto, 'Helvetica Neue', 'Open Sans', 'system-ui', '-apple-system', 'Segoe UI', Roboto, Ubuntu, Cantarell, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);"><strong style="border:0px solid;margin:0px;font-weight:600;font-family:Inter, '-apple-system', 'system-ui', 'Segoe UI', Roboto, 'Helvetica Neue', 'Open Sans', 'system-ui', '-apple-system', 'Segoe UI', Roboto, Ubuntu, Cantarell, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';font-size:14px;font-style:normal;text-transform:none;background-color:rgb(255,255,255);">Want to take responsibility and build solutions that truly matter? Apply now and help us shape the energy world of tomorrow.</strong><br style="border:0px solid;margin:0px;font-family:Inter, '-apple-system', 'system-ui', 'Segoe UI', Roboto, 'Helvetica Neue', 'Open Sans', 'system-ui', '-apple-system', 'Segoe UI', Roboto, Ubuntu, Cantarell, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);"><br style="border:0px solid;margin:0px;font-family:Inter, '-apple-system', 'system-ui', 'Segoe UI', Roboto, 'Helvetica Neue', 'Open Sans', 'system-ui', '-apple-system', 'Segoe UI', Roboto, Ubuntu, Cantarell, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);"></span><span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);display:inline;">Learn </span><span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;"><a href="https://1komma5.com/de/ueber-uns/jobs/tech/" style="border:0px solid;margin:0px;color:inherit;text-decoration:underline;font-family:Inter, '-apple-system', 'system-ui', 'Segoe UI', Roboto, 'Helvetica Neue', 'Open Sans', 'system-ui', '-apple-system', 'Segoe UI', Roboto, Ubuntu, Cantarell, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);">more</a></span><span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;font-style:normal;font-weight:400;text-transform:none;background-color:rgb(255,255,255);display:inline;"> about our Product & Tech team!</span> <h2>Your mission</h2> <span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">As part of one of our teams around Heartbeat AI, you will help building our virtual power plant leveraging our energy manager "Heartbeat", and continuously ship innovative energy market solutions to our customers.<br>This is a builder role at the intersection of engineering and product: you co-own the product, define what gets built together with your cross-functional team, ship it fast, and use AI as a force multiplier along the way. Cloud Architects and SREs will enable you to easily deliver and run software in a consistent, secure, and reliable way.<br></span><br><span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;"><strong>Our Stack:</strong><br></span><ul><li style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">TypeScript, NestJS, Next.js, Flutter</li><li style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">AI-assisted development with Cursor and agentic coding workflows</li><li style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">SQLMesh, BigQuery, Looker</li><li style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">GCP, Vercel, GitHub Actions, Datadog</li><li style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">Linear, Notion, Figma, Miro</li></ul><span style="font-family:Arial, Helvetica, sans-serif;font-size:14px;"><strong>Key responsibilities include but are not limited to:</strong><br></span><ul><li style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">Own feature development end-to-end, from problem framing through production deployment to long-term maintenance</li><li style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">Define feature scope together with PMs and engage with the "why", not just the "what"</li><li style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">Drive technical decisions and guide fellow engineers on architectural choices</li><li style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">Keep feedback loops short: prototype, ship to real users, observe, adjust</li><li style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">Use AI tools to amplify your impact and explore AI-powered product opportunities where they make sense</li><li style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">Push back when something doesn't make sense and propose a better direction</li><li style="font-family:Arial, Helvetica, sans-serif;font-size:14px;">Improve developer experience by reducing tech debt, automating workflows, and documenting decisions and runbooks</li></ul> <h2>Your profile</h2> <ul><li>Solid backend engineering skills with a strong grasp of distributed systems; TypeScript experience is a plus but not required</li><li>Experience with at least one frontend framework</li><li>Familiarity with cloud infrastructure, CI/CD pipelines, and observability tooling; you understand how your code runs in production</li><li>Proven ability to own features end-to-end, from rough problem statement to shipped, maintained product</li><li>A product and customer mindset: you think about user problems, not just implementation elegance</li><li>Experience working in cross-functional teams with product managers and designers</li><li>You actively seek input from your peers and create visibility where it's lacking</li><li>Comfortable with ambiguity and proactive about asking for what you need to get the job done</li><li>Excited to leverage AI tools to enhance your impact, including agentic coding</li><li>You communicate ideas clearly and concisely in written and spoken English</li></ul><strong>Ideally You Also Bring One of These</strong><br>You check at least one of these boxes. It's how we match you to the right team:<br><ul><li>Flutter or mobile development experience</li><li>Data engineering fundamentals (BigQuery, data pipelines)</li><li>Hands-on experience with energy systems, IoT, or climate tech</li></ul><strong>Bonus Points for </strong><br><ul><li>German language skills</li><li>Experience building AI-powered product features (LLMs, agents)</li><li>Prior experience in a startup or scale-up environment</li></ul> <h2>Benefits</h2> <ul><li>You are part of an international, dynamic, and highly motivated team of people who have proven to make things happen</li><li>With your work, you accelerate the "energy transition" and hence have a direct impact on our climate</li><li>Work with and learn from other super-smart colleagues</li><li>You will enjoy direct contact with core decision-makers</li><li>You will enjoy the best chances of entering full-time in one of Europe’s most thriving scaleups</li><li>You work remotely (Germany-wide), with offices in Hamburg, Berlin or Munich</li><li>Create a healthy balance alongside your work and enjoy all the benefits of the EGYM Wellpass</li><li>Benefits and discounts are yours with Futurebens</li><li>Whether city bike or e-bike - be flexible with our job bike leasing and do something good for the environment at the same time</li></ul> <h2>About us</h2> <div style="font-weight:300;color:rgb(34,34,34);font-size:16px;font-style:normal;background-color:rgb(255,255,255);"><span style="font-size:14px;font-family:Arial, Helvetica, sans-serif;">"At 1KOMMA5°, our vision is to accelerate CO2 neutral life for all! We created an easy one-stop-shop to buy and install solar, charging stations and heat pumps, with the purpose of liberating all European homes from the shackles of fossil fuels. With Heartbeat, we make clean energy smarter. Connecting our customers into one powerful clean energy operating system to enable flexible tariffs and to ultimately follow the rhythm of wind and sun!" - Philipp Schröder (CEO 1KOMMA5°)</span></div>

Back to blog

Common Interview Questions And Answers

1. HOW DO YOU PLAN YOUR DAY?

This is what this question poses: When do you focus and start working seriously? What are the hours you work optimally? Are you a night owl? A morning bird? Remote teams can be made up of people working on different shifts and around the world, so you won't necessarily be stuck in the 9-5 schedule if it's not for you...

2. HOW DO YOU USE THE DIFFERENT COMMUNICATION TOOLS IN DIFFERENT SITUATIONS?

When you're working on a remote team, there's no way to chat in the hallway between meetings or catch up on the latest project during an office carpool. Therefore, virtual communication will be absolutely essential to get your work done...

3. WHAT IS "WORKING REMOTE" REALLY FOR YOU?

Many people want to work remotely because of the flexibility it allows. You can work anywhere and at any time of the day...

4. WHAT DO YOU NEED IN YOUR PHYSICAL WORKSPACE TO SUCCEED IN YOUR WORK?

With this question, companies are looking to see what equipment they may need to provide you with and to verify how aware you are of what remote working could mean for you physically and logistically...

5. HOW DO YOU PROCESS INFORMATION?

Several years ago, I was working in a team to plan a big event. My supervisor made us all work as a team before the big day. One of our activities has been to find out how each of us processes information...

6. HOW DO YOU MANAGE THE CALENDAR AND THE PROGRAM? WHICH APPLICATIONS / SYSTEM DO YOU USE?

Or you may receive even more specific questions, such as: What's on your calendar? Do you plan blocks of time to do certain types of work? Do you have an open calendar that everyone can see?...

7. HOW DO YOU ORGANIZE FILES, LINKS, AND TABS ON YOUR COMPUTER?

Just like your schedule, how you track files and other information is very important. After all, everything is digital!...

8. HOW TO PRIORITIZE WORK?

The day I watched Marie Forleo's film separating the important from the urgent, my life changed. Not all remote jobs start fast, but most of them are...

9. HOW DO YOU PREPARE FOR A MEETING AND PREPARE A MEETING? WHAT DO YOU SEE HAPPENING DURING THE MEETING?

Just as communication is essential when working remotely, so is organization. Because you won't have those opportunities in the elevator or a casual conversation in the lunchroom, you should take advantage of the little time you have in a video or phone conference...

10. HOW DO YOU USE TECHNOLOGY ON A DAILY BASIS, IN YOUR WORK AND FOR YOUR PLEASURE?

This is a great question because it shows your comfort level with technology, which is very important for a remote worker because you will be working with technology over time...