Graduate Software Engineer

A growing clean-energy engineering business is looking for a hands-on Senior PLC Software Engineer to support the development of next-generation ammonia cracking systems. This role will focus on developing and implementing PLC-based control systems as the business continues to transition from prototype into scalable, deployable products. You'll be working across the full lifecycle from software design through to real-world commissioning playing a key role in ensuring systems operate reliably in live environments. This is a technical expert role, suited to someone who enjoys owning problems, improving development processes, and working closely with physical systems. Senior PLC Software Engineer Cranleigh, Surrey (Hybrid) Permanent, Full-time, Bonus scheme, Private healthcare, Share Options, Pension contribution, 25 days holiday + bank holidays, Flexible hours, Life assurance What you'll be doing · Designing and developing PLC software for ammonia cracking systems · Programming PLCs (Siemens S7 / TIA Portal preferred, others considered) · Working within an existing system architecture, with increasing input over time · Defining and improving software development processes and standards · Producing structured, maintainable code (IEC (phone number removed) · Supporting software verification and validation (including simulation where applicable) · Integrating PLC systems with wider control architecture (HMI, SCADA, instrumentation) · Supporting and leading commissioning activities, fault finding and debugging on live systems · Working closely with multidisciplinary teams across mechanical, electrical and systems engineering · Supporting data acquisition and system connectivity where required

· Proven experience in industrial automation within Chemical processing or Manufacturing environments. · Strong PLC programming experience (Siemens S7 ideal, others considered) · Experience across the full lifecycle: design, development, testing and commissioning · Strong fault finding and on-site debugging capability · Experience working on complex engineered or process systems · Ability to bring structure and rigour to software development processes Desirable: · Experience with simulation or software verification environments. · Exposure to process systems, energy systems or similar technologies. · Understanding of industrial communication protocols. Why apply · Work on cutting-edge hydrogen and ammonia energy technology. · Be part of scaling a novel technology from prototype to commercial deployment. · High-impact, hands-on engineering role. · Flexible hybrid working with real autonomy. · Opportunity to shape how control systems are developed as the business grows.