Senior Software Engineer

Brill Power Limited; Oxford; On-site; GBP 60,000 - 80,000; Full time

Job summary

A leading energy tech company is seeking a Senior Software Engineer to lead the development of its IoT device software and cloud platform. The role requires proficiency in C# programming with at least 8 years of experience, focusing on developing and maintaining the software that powers innovative energy storage solutions. Enjoy a competitive salary, flexible hours, and a collaborative team environment in Oxford. Ideal candidates also have experience with cloud services and a strong problem-solving mindset.

Benefits

Competitive salary

25 days holiday plus bank holidays

Flexible working hours

Regular team social events

Qualifications

• 8 years’ experience in C# (.NET Core 8 and later).
• Successful track record in cloud services ideal.
• Familiarity with IoT solutions preferred.

Responsibilities

• Develop and maintain C# codebase for IoT devices.
• Create and support cloud platform software.
• Build APIs for data exchange with external systems.

Skills

C# programming

Experience with cloud services

Docker

Fast learner

Able to work autonomously

Education

Undergraduate degree in Computer Science or Engineering

Tools

Azure

C++

Python

Job description

We are looking for a Senior Software Engineer with proficiency in C# programming to lead the development of the IoT device software and cloud platform software for our connected energy storage systems. The successful candidate will be responsible for the development and maintenance of communications and cloud backend for our IoT devices. This role is based at our head office in Oxford in the UK.

About

Brill Power

Brill Power , a subsidiary of Palmer Energy Technology, works at the cutting edge of energy storage, power electronics, and battery software. We are a team of problem solvers and innovators, keen to make energy storage as efficient , sustainable, and widely adopted as possible .

Established in 2016, Brill Power is a deep-tech company with roots in the Engineering Department at the University of Oxford. Acquired in 2025 by Palmer Energy Technology Limited, we continue to grow our impact and expand to new markets. We are a small and talented team based in Oxford who are looking for new members to join us for the next chapter of Brill Power.

Fun

Essential to success. We love what we do.
We think you should too.

We are a team with mutual respect and understanding

We are driven by innovation and leading the way in battery intelligence

We work collaboratively to solve problems

About

The Role

We are looking for a Senior Software Engineer with proficiency in C# programming to lead the development of the IoT device software and cloud platform software for our connected energy storage systems. The successful candidate will be responsible for the development and maintenance of communications and cloud backend for our IoT devices. This role is based at our head office in Oxford in the UK.

Job Overview and responsibilities

Brill Power develops innovative software and hardware for battery system and energy management. Our proprietary IoT devices enable connectivity, data acquisition and control of battery energy storage systems to provide our customers with an end-to-end hardware + software solution.

The person who joins us as Senior Software Engineer will design, develop and deploy the software that runs on our IoT devices and our cloud platform as part of the software and data team. The successful candidate will work closely with our Oxford-based data, firmware and aftersales engineers, as well as our parent company’s international technical teams to deliver and maintain our IoT infrastructure. Key responsibilities include :

Responsibilities Include

• IoT Software Development : Developing and maintaining the C# codebase for our IoT devices
• Cloud Software Development: Developing and maintaining the C# codebase for our cloud platform
• API Development : Developing APIs to expose data to external systems, or to ingest data from those systems into our own
• Monitoring & Troubleshooting: Maintaining system reliability, performance, and resolving connectivity issues
• Collaboration and Communication : Working with internal and external software teams, battery & data experts
• Team Dynamics: Maintaining a positive and productive atmosphere within the team

Skills and Experience

Successful candidates will have experience with the following:

• 8 years’ experience in C# (.NET Core 8 and later)
• Experience with cloud services (ideally Azure)
• Experience with Docker
• Undergraduate degree in Computer Science, Engineering, or equivalent experience

Nice to Have

• Experience with CAN, ModbusQuestDB, DuckDB or KDB
• Working knowledge of C++, Python
• Track record of successfully delivering commercial IoT solutions

Working Style:

• Fast-learner, eager to pick up new technologies
• Pragmatic; comfortable with ambiguity and changing requirement
• Able to work autonomously
• Comfortable working in a small team with a diverse range of responsibilities

Brill Power Benefits

In addition to a fun and friendly team and working environment, we offer:

• Competitive salary, based on experience
• 25 days of holiday plus bank holidays
• Benefits package to be agreed
• Full time, permanent role, with flexible working hours
• Regular team social events

Get in touch

There is no perfect candidate,and no single person can do it all, but if this sounds like you and you’re looking for somewhere to thrive,we want to hear from you.

Brill Power is an equal opportunity employer and welcome applications from all, without regard to their race, sex, disability, religion/belief, gender reassignment, national origin, sexual orientation, or age.

Please send a CV and cover letter to [e-mail] , clearly indicating where your skills and experience match what we are looking for in this role.

Brill Power is proud to be a certified Oxford Living Wage employer.