Software Developer

The ANSWERS Software Service has, for over 40 years, supplied both the UK nuclear industry and the wider international market with high quality software and consultancy services in the areas of reactor physics, radiation shielding & dosimetry, criticality assessment and nuclear data. Our dedicated team of specialist engineers, physicists, mathematicians and software developers produce bespoke software packages for computational modelling of complex physics. Our worldwide customer base is supported by a dedicated helpline with experienced consultants and analysts to provide comprehensive advice in computational modelling of nuclear engineering problems.

ANSWERS is currently recruiting for a talented Software Developer to join a multidisciplinary development team developing next generation computational modelling software for analysis of nuclear reactor physics. This role will present an enthusiastic and motivated individual with a unique opportunity to be involved in the creation of a brand-new software product from the ground up, to work with cutting-edge technology to establish the new state-of-the-art in industrially applied physics codes, and to support the design and operation of existing and new nuclear reactor systems worldwide for decades to come. Key Responsibilities will be:

• Collaborate with the ANSWERS reactor physics team to translate mathematical and physics models into practical, easy-to-use software for use by a wide-ranging customer base including industry, academia and government professionals
• Design, implement and optimise high-performance algorithms for simulations on a variety of computer architectures, from single workstations to modern HPC platforms featuring a combination of CPUs and GPUs
• Provide a robust and scalable software code base for complex scientific computations, which can scale, evolve and adapt to future reactor physics requirements
• Ensure the development of quality software according to ANSWERS procedures, through testing, documentation and version control, and to help these procedures and policies develop to meet the latest requirements
• Lead and drive the software development and testing process with a view to continuous improvement. Your perspective and your voice will be critical to shaping a robust, future-proof solution and ensuring the success of this project.

• Strong knowledge and experience of using C++, Python
• Knowledge of parallel computing methods and performance optimization
• Familiarity with common system tools including build systems, version control, code documentation methods
• Experience of using GPU acceleration methods
• Desirable:
• Knowledge and experience of Fortran and Java
• Experience in UI development for scientific software and visualisation of data
• Background, knowledge or previous experience in nuclear engineering, reactor physics or related fields.
• Previous experience of the implementation of physics or mathematical methods to computational modelling codes
• Experience of implementing distributed and shared memory parallelisation methods on CPU-based HPC architectures
• Ability to start in early 2026

This role will involve an initial familiarisation period at our Dorchester office, where the team for deterministic reactor physics code development is based. Following this, the position can develop into a hybrid / remote role at any of our offices in Dorchester, Warrington or London. Consideration will also be given in respect to part time & flexible working hours.

Our values are built on a strong foundation of safety, integrity, and respect for every individual. People are at the heart of our mission, and we believe in supporting one another through a culture of care and collaboration.

We strive to create a workplace where everyone feels they belong and can thrive. Supporting mental wellbeing and fostering a sense of connection are essential to how we work.

When we embrace different perspectives and work together, we become more innovative, more agile, and more successful.

We partner with VERCIDA, for greater online accessibility please visit to view and access our roles. As a Disability Confident employer, we will interview all disabled applicants who meet the minimum criteria for a vacancy. We welcome applications from candidates who are seeking flexible working and from those who may not meet all the listed requirements for a role.

If you require further support or reasonable adjustments with regards to the recruitment process (for example, you require the application form in a different format), please contact the team.