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Full Stack Software Engineer
- Tokyo
- Partial Remote
- Full-time
- September 18, 2025
Help us use technology to make a big green dent in the universe!
Kraken powers some of the most innovative global developments in energy.
We’re a technology company focused on creating a smart, sustainable energy system. From optimising renewable generation, creating a more intelligent grid and enabling utilities to provide excellent customer experiences, our operating system for energy is transforming the industry around the world in a way that benefits everyone.
It’s a really exciting time in energy. Help us make a real impact on shaping a better, more sustainable future.
Our team’s goal is to make Kraken’s software as awesome as the Customer Support Specialists who use it every day.
The team is responsible for the overall look and feel of the software our Specialists use at Kraken, working directly on some of its pages, and being responsible for our in-house component system. Our work empowers Kraken’s many backend teams to build amazing features without having to worry about CSS and JavaScript getting in their way, setting patterns across Django templates, React and HTMX. They are also responsible for widely-used frameworks in Kraken!
Although this is a full-stack role, we’re specifically looking for a strong backend developer in Python with a solid understanding of Django, to help us become even more of a full-stack powerhouse.
What you'll do
- We have lots of difficult design challenges to solve. The Japanese energy market is complicated, outdated and process-heavy - there's an awful lot of domain modelling that we need to get right. Strong attention to detail is essential.
- We have difficult technical problems to solve. With the advent of smart meters, we'll soon be processing millions of meter readings a day. We need the right technology in place to handle this smoothly as well as feeding data into a machine learning pipeline that models and predicts consumption.
- There's a great opportunity for disruption in the Japanese energy market. The energy landscape is changing as we move to more dis-aggregated forms of generation, with less predictability, more dynamism and smarter technology. Octopus Energy were the first UK supplier to introduce a "tracker" tariff whose prices track the daily wholesale prices: http://www.cleanenergynews.co.uk/news/efficiency/octopus-offers-transparency-with-wholesale-price-tariff
- You'll be working for a company that’s fighting climate change. Our parent company is the largest investor in solar generation in the UK, and are funding wind and anaerobic digestion. As a supplier, we're helping people to use greener technology and renewable energy, all helping move the UK towards a lower carbon future.
What you'll have
- We're looking for someone with a general interest in technology and problem-solving; someone diligent and thoughtful. It would be helpful to have experience/expertise in the following (in rough priority order):
- Python / Django backend
- React / TypeScript frontend
- Domain modelling
- HTTP and REST APIs
- Writing robust and fault-tolerant software
- Celery and async processing
- Postgres
Plus experience in the following would be a bonus:
- AWS
- Terraform, Packer, Consul
- Ability to speak Japanese would be a plus
What you'll love about us
- Our company culture - we won best company to work for in 2019 and our CEO, Greg has recorded a podcast about our culture and how we empower our people
- Flexible working environment - genuine work life balance here, we are in the top 5 companies in the UK, we treat you as a human, and do our best to make work and life merge smoothly together
- Relaxation - we don’t count your holidays here, we work hard, and so we know you need to play hard as well (within reason of course)
- Equity Options Scheme - you own your own part of the business, share options in the whole Octopus Energy Group so we all work together towards success
- Office culture - have a certain tech requirement? We’ll do our best to get it. Our offices are also stocked with fruit, breakfast, great coffee and soft drinks. Weekly on a Friday we all get together (this happens virtually too) for company updates and drinks - we call it Family Dinner
- Your development is important - we support and help with development including internal and external courses, learning, study support etc, all bespoke to you
Kraken is a certified Great Place to Work in France, Germany, Spain, Japan and Australia. In the UK we are one of the Best Workplaces on Glassdoor with a score of 4.7. Check out our Welcome to the Jungle site (FR/EN) to learn more about our teams and culture.
About Kraken Technologies
Help Kraken use technology to make a big green dent in the universe! Kraken powers some of the most innovative global developments in energy and is built to empower businesses to lead the energy transition from generation to supply.
Kraken is a technology company focused on creating a smart, sustainable energy system. From optimising renewable generation, creating a more intelligent grid and enabling utilities to provide excellent customer experiences, their operating system for energy is transforming the industry around the world in a way that benefits everyone.
They are now licensing Kraken to businesses in 17 countries around the world and manage over 300,000 energy assets.
Kraken's original goal was to have 100 million customers on the Kraken Platform by the year 2030. As Kraken is far ahead of schedule with 60 million accounts, they are bringing the end date forward to 2027!
Some of the businesses Kraken partner with include E.ON in Europe, Origin in Australia, and Tokyo Gas in Japan.
Kraken is looking to continue growing their Japanese operations to build more tech to make energy in Japan greener and increase their investment in service and growth in Japan and Globally.
To get an idea of what it’s like to work at Kraken, hear from Karim, one of Kraken's Engineers here.
