Senior Backend Developer to tackle climate change

Salary DKK 50,000 - DKK 65,000
Equity To be negotiated

Hello 👋

We're looking for a Senior Backend Developer that will be a part of the early engineering team, defining our tech stack, building the foundation and being part of a journey where you work with a team on something the world urgently needs.


Build the tech platform that makes it seamless to decarbonise your home 🌍 

Carbon emissions are still increasing, but we can do something about it.

In Europe, 12% of our CO₂ emissions come from heating our homes (about as much as using our cars).

Getting those emissions to zero will be a gargantuan task; retrofitting a building with sustainable alternatives is a complex task involving many stakeholders - and there are 90 million buildings that need an upgrade.

Technology alone won't solve the issue, but we believe it can remove bottlenecks to make those retrofits a more seamless and more affordable option for everyone involved.

We're building the platform that makes it easy for everyone to estimate, configure and model a heat pump deployment in homes, while reducing friction that keeps craftsmen from loving being a sustainability hero.


That's where you come in ☝️ ☝️ ☝️ 

  • Define a new codebase: Build a codebase from a clean slate. You'll build a system that orchestrates a messy physical world and which will scale into adjacent, carbon reducing domains. 

  • Build what matters: Spend your working hours designing and developing end-to-end solutions that makes it seamless to transition to a green home and economy

  • Own your code: You'll get full responsibility of the code you write, but surrounded by people who are there to help

  • Create an amazing dev experience: Optimise the developer experience for yourself and your team members, allowing us to move the needle efficiently

  • Establish a technical culture: Establish/promote an honest learning culture, built on trust and a growth mindset

  • Help others shine: Constructively suggest technical approaches, improve solutions and perform code-reviews with peers, so we can carve the best path forward


To be succesful in the role, you are likely:

  • An experienced backender: You probably have 3+ years of experience working as a software engineer - you've worked with Python, Go or similar in the backend and have some familiarity with basic devops.

  • Passionate about the craft: You take a pride in your craft, and you're curious about staying up to date on new technologies and practices. You strive for balance between tried-and-tested, and new and shiny.

  • Interested in fighting climate change: We are solving a climate problem and solving it is our first priority. Some of the work we'll be doing may not be glorious, but it helps our future generations.

  • Work independently, anchored in teamwork: You thrive out of silos and with early collaboration in building product, and have opinions on what we are building and why.

  • Naturally good at balancing now and future: What matters to you is the real life value our stakeholders get from what you are building. You sense when it's time to pay tech debt and when it can be incurred in the interest of speed. 

  • A sharer and teacher: We want you to bring your experience and how you like to work into the mix, so we can create an awesome company together. Similarly, you want to learn from other people's experiences.

  • Okay with ambiguity: Early startup life is never a straight line. You don't mind that ambiguity, and can see when structure is required and when it's in the way.

  • A plus if: You've been part of an early startup journey/setting up tech stacks

  • A plus if: You've worked with or around workflow/orchestration/process-heavy industries

For more information or questions please contact us at

Perks and benefits

This job comes with several perks and benefits

Free lunch
Free lunch

Enjoy a free catered lunch with your colleagues, every day.

Free coffee / tea
Free coffee / tea

Get your caffeine fix to get you started and keep you going.

Near public transit
Near public transit

Easy access and treehugger friendly workplace.

Social gatherings
Social gatherings

Social gatherings and games; hang out with your colleagues.

Pension plan
Pension plan

We take care of you, even when you are old and wrinkly.

Equity package
Equity package

Want to be a partner? Look no further.

See all 8 benefits

Working at

The world needs to get rid of fossil fuels in heating our homes for the climate and for energy independence. The only option we have is to massively accelerate heat pump deployment. Lun builds the software that makes it seamless for consumers, installers and vendors to scale up their heat pump efforts efficiently - and with every heat pump we help deploy reduces carbon emissions by ~1 gasoline car. We have incredible backers and are building an awesome team motivated by making a difference. If you want to spend your days doing your best work on what matters most reach out!

Read more about Lun

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