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Senior Software Engineer - Financials, Cost & Charging
- Tokyo
- Partial Remote
- Full-time
- July 3, 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
All technology is written and maintained by a multi-discipline engineering team of around 800 people. This includes server-side, client-side and mobile engineers working closely with UX experts, copywriters and designers. We follow a Kanban-like approach, using Google docs and Asana to specify and manage work; Github, CircleCI and Terraform Enterprise as part of an immutable-infrastructure, continuous delivery pipeline; and Loggly, Sentry and Cloudwatch to measure performance and monitor production. Kraken is a great place to learn, work with some talented engineers and level-up your skills. Some of our coding conventions are open-source .
Our technology
On the server-side, we mainly use Python. Most of our websites are powered by Django, Django-REST-framework and GraphQL (Graphene). We use AWS heavily, employing most of the "Hashistack" (eg Packer, Consul, Terraform) as part of a continuous deployment pipeline. See, for example, Django, ELB health checks and continuous delivery.
What you'll do
- Develop an innovative and highly technical product, central to Kraken's billing system used by a multitude of countries, markets, and clients.
- Abstract specific problems into generic building blocks that clients can use to build and modify their systems.
- You will be working in a multi-disciplinary software engineering team; solving design challenges; domain modeling; solving technical problems; engineering solutions for smart meters; writing robust fault-tolerant software primarily in Python, Celery, and async processing.
- We have lots of difficult design challenges to solve. The energy market is complicated, outdated, and process-heavy - there's an awful lot of domain modeling that we need to get right.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.
- There's a great opportunity for disruption in the energy market. The big suppliers still dominate but are not exactly popular. The energy landscape is changing as we move to more disaggregated forms of generation, with less predictability, more dynamism, and smarter technology. Octopus Energy was the first UK supplier to introduce a "tracker" tariff whose prices track the daily wholesale prices.
- 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 is funding wind and anaerobic digestion. As a supplier, we're helping people to use greener technology and renewable energy, all helping move the world towards a lower carbon future.
What you'll have
- Ability to think abstractly to solve general problems, not directly tied with an immediate user need.
- Skills in identifying performance bottlenecks and optimising code.
- Experience with developing development frameworks or language design
- Experience in designing scalable and maintainable systems. Understanding of design patterns and best practices.
- Celery and async processing
- PostgresREST and GraphQL APIs
- Plus experience in the following would be a bonus: AWSTerraform, Packer, Consul
If this sounds like you then we'd love to hear from you.
Studies have shown that some groups of people, like women, are less likely to apply to a role unless they meet 100% of the job requirements. Whoever you are, if you like one of our jobs, we encourage you to apply as you might just be the candidate we hire. Across Kraken, we're looking for genuinely decent people who are honest and empathetic. Our people are our strongest asset and the unique skills and perspectives people bring to the team are the driving force of our success. As an equal opportunity employer, we do not discriminate on the basis of any protected attribute. Our commitment is to provide equal opportunities, an inclusive work environment, and fairness for everyone.
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.
