Senior Software Engineer (C++ / Data… at Tokamak Energy · Abingdon

Tokamak Energy is a global leader in fusion energy and high temperature superconducting (HTS) technologies. We work with governments and industry to develop and bring fusion and HTS solutions to market through innovation and strategic partnerships. A major part of this is our end to end capability in HTS systems, from design to manufacturing.

We are the Magnet Systems Partner for the UK Government's STEP Fusion programme, under a £70 million contract running to 2029, working with UK Fusion Energy to deliver HTS magnet systems for the STEP prototype power plant, while also contributing to tokamak systems and plasma integration.

Founded in 2009 as a spin-out from the UK Atomic Energy Authority, Tokamak Energy is headquartered in Oxfordshire, with subsidiaries in the United States and Japan. Today, we employ over 300 people and have secured more than £280 million in investment.

We operate through three divisions:

Fusion - Fusion energy technologies, expertise and testbeds for government and private fusion programmes, including ST40, the world’s highest field spherical tokamak.

TE Magnetics - HTS systems for commercial applications including fusion energy, power distribution, life sciences, and propulsion.

Ridgway Machines - Manufacturing equipment for the superconducting, electrical and wider energy sectors, enabling the rapid industrialisation of HTS products.

Overview of the role

This role focuses on developing real-time software that interfaces directly with hardware to control and monitor complex engineering systems.

You will build C++ applications running on embedded and Linux-based platforms, handling data acquisition, control, and system integration.

This is a key hire in a small but growing software team, offering strong ownership and impact on core systems.

In this role, you will:

• Develop C++ software for real-time data acquisition and system control
• Interface directly with hardware using communication protocols such as USB, TCP/IP, SPI, I2C and serial
• Build tools and interfaces for system monitoring and control
• Develop backend tooling for data storage, processing, and retrieval
• Take ownership of core control software within the team
• Collaborate with electronics engineers and other technical teams

Essential

• Strong C++ development experience
• Experience building asynchronous or real-time systems
• Comfortable working in a Linux environment
• Experience interfacing with hardware and communication protocols
• Familiarity with version control and build systems such as Git and CMake

Desirable

• Embedded Linux or ARM-based systems

• Asynchronous I/O frameworks such as Boost.Asio

• Real-time systems or networking

• Messaging protocols such as MQTT

• Experience working with hardware such as FPGAs or microcontrollers

• Salary range up to £75,000 dependent on skills and experience and will be discussed from the outset

• 25 days holiday + bank holidays, plus discretionary festive shutdown

• Performance-led rewards including discretionary bonus, innovation and merit schemes

• Share options – a stake in our future success

• Pension and comprehensive financial protection package including death in service and critical illness cover

• Health and wellbeing support, including cash plan and 24/7 assistance

• Ongoing investment in your growth with training and career progression

• Be part of world-changing innovation in Fusion Energy

Important information for candidates

No terminology in the advert or job description is intended to discriminate on the grounds of a person’s age, disability, gender reassignment, marriage or civil partnership, pregnancy or maternity, race, religion or belief, sex, or sexual orientation. Every candidate will be assessed only in accordance with their merits, qualifications and abilities to perform the duties of the job.

Pre-employment screening

Please note that the appointment of the successful candidate will be subject to standard pre-employment screening, as applicable to the post. This will include right-to-work, proof of identity and references.

Data privacy

Please note that any personal data submitted to Tokamak Energy as part of the job application process will be processed in accordance with the GDPR and related UK data protection legislation, for more information regarding GDPR please see: https://www.gov.uk/government/publications/guide-to-the-general-data-protection-regulation

Equality of opportunity

Entry into employment with the Tokamak Energy and progression within employment will be determined only by personal merit and the application of criteria which are related to the duties of each post and the relevant salary structure. In all cases, ability to perform the job will be the primary consideration. No applicant or member of staff shall be discriminated against because of age, disability, gender reassignment, marriage or civil partnership, pregnancy or maternity, race, religion or belief, sex, or sexual orientation.