Senior PLC 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

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 (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

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