Senior PLC Software Engineer

Senior PLC Software Engineer – Cranleigh, Surrey (Hybrid) – Permanent, Full-time – Salary: £ Competitive + Benefits:
Bonus scheme, Private healthcare, Share Options, Pension contribution, 25 days holiday + bank holidays, Flexible hours, Life assurance

• 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 61131-3)
• 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

• Experience with simulation or software verification environments.
• Exposure to process systems, energy systems or similar technologies.
• Understanding of industrial communication protocols.

• 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.

Contact Lewis at