Lunar is transforming the way we power our homes by building an ecosystem of all-electric products starting with a next-generation home battery system. The Lunar team is made up of savvy entrepreneurs as well as passionate technology and industry experts who build and deploy products to electrify homes, which are connected through an integrated software platform called, Gridshare.

We are looking for a Principal Developer to join a team of talented engineers and data scientists to deliver a more sustainable future. We are building the best products of their kind in the market and for that reason, we are assembling a world-class team. 


  • Architect complex parts of the Software platform
  • Oversee the implementation of software features by reviewing pull requests, participating in pair programming sessions, etc.
  • Develop software solutions as a sole contributor or by working alongside others
  • Provide mentorship and guidance to other team members
  • Contribute to building up a culture of excellence in Software Engineering inside Lunar Energy
  • Contribute to OpenSource projects
  • Be accountable for the long term health of parts of the codebase

You will be supported to work and grow your knowledge on multiple parts of the stack according to your personal interests and abilities.

Our team has a strong tradition of using functional programming and type systems to build pragmatic and flexible systems to satisfy business requirements. 

Required skills:

  • BSc, MSc in a technical field or equivalent practical experience
  • A minimum of 7 years experience in software development
  • Good knowledge of cloud computing using serverless technologies
  • Good knowledge of user interface development
  • Good knowledge of functional programming

Good to have:

  • Experience using AWS
  • Data Science and ML experience
  • Embedded Linux experience
  • Rust
  • Interest in the renewable energy sector or IoT

You should be: 

  • Happy working in a small, fast-moving team, in which your initiative and contributions can have a big impact 
  • Motivated and enthusiastic, open to learning new things
  • Self-starter, managing your own workload and deadlines and taking personal responsibility
  • Prepared to produce the best possible end product and codebase

Joining us gives you:

  • Competitive salary and stock options package
  • Private Medical Insurance scheme through BUPA (medical history disregarded);
  • A wellbeing and lifestyle benefits plan through Medicash
  • Enhanced Pension contributions: employer contributions matching 5%
  • A budget for work related training of £1,000 per financial year and an allowance of 4 training days
  • Cycle To Work scheme and Workplace Nursery benefit
  • £200 upon joining for remote work set-up
  • Access to Spill - Mental Health Support platform
  • Enhanced Maternity + Paternity Pay
  • 25 days annual holiday entitlement + 8 Bank Holidays
  • Flexible start and finish times, fully remote working or hybrid depending on preferences

Location: This role can be fully remote inside the GMT +/- 2 time zone. Our offices in Liverpool Street (London) and Manchester will remain available for any employees who wish to use them on a part-time or full-time basis.

We are proud to be an equal opportunities employer and welcome applications from all suitably qualified persons regardless of their race, sex, ethnicity, disability, religion/belief, sexual orientation, gender identity or expression, nationality, age or social background. We would like to actively encourage applications from those who identify with less represented and minority groups. We do not filter applications by university background and encourage those who have taken alternative educational and career paths to apply.


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