Senior PLC Software Engineer
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Summary
Cranleigh (Hybrid)
Full-time
Senior
About this Job
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 Salary: £. Competitive + Benefits: 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 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
What we’re looking for
· 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.
To apply or find out more
Contact Lewis at lewis@cranleighstem.co.uk
About the Company
