Senior Software Engineer

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.AboutBrill PowerBrill 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.FunEssential to success. We love what we do. We think you should too.We are a team with mutual respect and understandingWe are driven by innovation and leading the way in battery intelligenceWe work collaboratively to solve problemsThe RoleWe 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 responsibilitiesBrill 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.Responsibilities IncludeIoT Software Development : Developing and maintaining the C# codebase for our IoT devicesCloud Software Development : Developing and maintaining the C# codebase for our cloud platformAPI Development : Developing APIs to expose data to external systems, or to ingest data from those systems into our ownMonitoring & Troubleshooting : Maintaining system reliability, performance, and resolving connectivity issuesCollaboration and Communication : Working with internal and external software teams, battery & data expertsTeam Dynamics : Maintaining a positive and productive atmosphere within the teamSkills and ExperienceSuccessful 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 DockerUndergraduate degree in Computer Science, Engineering, or equivalent experienceNice to HaveExperience with CAN, ModbusQuestDB, DuckDB or KDBWorking knowledge of C++, PythonTrack record of successfully delivering commercial IoT solutionsWorking Style:Fast‑learner, eager to pick up new technologiesPragmatic; comfortable with ambiguity and changing requirementAble to work autonomouslyComfortable working in a small team with a diverse range of responsibilitiesBrill Power BenefitsIn addition to a fun and friendly team and working environment, we offer:Competitive salary, based on experience25 days of holiday plus bank holidaysBenefits package to be agreedFull time, permanent role, with flexible working hoursRegular team social eventsGet in touchThere 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 jobs@brillpower.com , 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. #J-18808-Ljbffr