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, drop me a message or contact me at lewis@cranleighstem.co.uk