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Senior Software Engineer I

Helsinki, FInland

About the job

We are looking for a Senior Software Engineer to join the Kapacity.io Team at EnergyHub! Our product helps energy retailers and households to optimize energy demand. You will have the opportunity to take ownership of your work and contribute to high impact projects. Our team, made up of former Y Combinator founders and elite product and software talent, builds some of the most advanced flexibility solutions in the market.

Join us in building high impact solutions for energy grid flexibility. If you’re a growth minded individual who has a passion for tech and energy, this team is for you!

We use Go, Python, Django, JavaScript, React, PostgreSQL and Docker in our products. We’re on AWS.

Here's what you'll do...

  • Architect and build scalable software that powers Kapacity.io’s optimization products, taking ownership of technical quality and design choices.
  • Drive the engineering culture by leading technical discussions and improving development processes.
  • Partner with product and sales to translate complex, ambiguous business requirements into concrete technical roadmaps.

Here's what we're looking for...

  • You bring 5+ years of experience delivering complex, production-quality software systems.
  • You possess deep expertise in Go(lang) or Python, Docker, and AWS, along with strong command of Relational Databases (PostgreSQL) and time-series data.
  • You thrive in ambiguous environments and excel at structuring vague challenges into clear technical solutions.
  • Have interest in energy, buildings, and climate tech.
  • Strong written and verbal communication skills in English.
  • Ability to work weekly at our office in Helsinki.

What we offer you...

  • Join an agile, growth-minded team led by ex-YC founders, backed by EnergyHub’s 200+ multinational workforce.
  • We use Slack, Google, AWS, Zoom, and modern AI tools.
  • Thrive with ample career development opportunities while making a global impact.
  • Enjoy a culture that prioritizes your daily well-being and work-life balance just as much as our social events.

About Kapacity.io, part of EnergyHub
Kapacity.io, part of EnergyHub, is a European software provider delivering residential flexibility for energy retailers through advanced heat pump optimisation. We help homeowners save on energy bills while enabling retailers to unlock new revenue streams and support a fully decarbonised grid.

EnergyHub is a growing enterprise software company that works with the most forward-thinking companies in smart energy. EnergyHub’s platform lets consumers turn their smart thermostats, electric cars, water heaters, and other products into virtual power plants that keep the grid stable and enable higher penetration of solar and wind power. EnergyHub works on technology that already provides energy and cost savings to millions of people through partnerships with the leading companies.

Visit kapacity.io to learn more.

  • Location: Helsinki, Finland (Weekly office presence required)
  • Employment Type: Full-time, Permanent
  • Working Hours: In accordance with the Finnish Working Hours Act, typically 37.5–40 hours per week.
  • Working Language: English* (Note: As an international organization with a multinational workforce and global client base, English is our primary working language; proficiency in Finnish or Swedish is not required for this role).
  • Salary Range: €5,500 – €6,500 / month (gross)
  • Application Process: Applications will be reviewed on a rolling basis.

Employer of Record
EnergyHub does not maintain a legal entity in Finland. Employment for this role will be carried out through Deel, Inc., which will act as the Employer of Record. The employment contract will be concluded with Deel, Inc. and governed by Finnish employment law. Deel, Inc. will be responsible for payroll, taxes, applicable benefits and statutory employer obligations in Finland.

Equal Opportunity & Data Privacy
EnergyHub is an Equal Opportunity Employer and is committed to compliance with the Finnish Non-Discrimination Act.

In connection with your application we act as data controllers. We collect personal data necessary for the recruitment process, including your name, contact details, employment and education history, and other information you provide.

  • Data Controller & Rights: The data controllers for your personal data are EnergyHub. In accordance with the EU General Data Protection Regulation (GDPR), you have the right to access, rectify, or request the deletion of your personal data. 
  • Special Categories: Any diversity-related or demographic information, where collected, is strictly voluntary and processed in an anonymized format for statistical purposes, in accordance with applicable data protection laws.
  • Data Retention: By submitting your application, you acknowledge that we may retain your application data for up to 24 months for recruitment record-keeping and to comply with labor laws and regulations.

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