Senior EC&I Design Engineer Sheffield – Flexible Working | High-Integrity, Safety-Critical Projects Why apply? Join a leading UK engineering business recognised for delivering innovative mechanical handling and control systems across the defence, aerospace, nuclear, and infrastructure sectors. You’ll work on technically challenging, safety-critical projects from concept through to commissioning, within a collaborative team that values precision, creativity, and continuous learning. What’s on offer * Flexible start and finish times around core hours * 25 days’ holiday plus bank holidays, with the option to buy extra * Salary-sacrifice pension scheme with enhanced employer contribution * Long-service awards and employee referral bonuses * Exposure to some of the UK’s most complex and high-integrity engineering projects The role As a Senior EC&I Engineer, you’ll take technical ownership of bespoke electrical, control, and instrumentation systems, spanning both hardware and software design. Key responsibilities include: * Defining and delivering EC&I system specifications in line with demanding client requirements * Designing and integrating safety-critical controls into complex machinery and handling systems * Producing documentation including Basis of Design, FDS, and SDS * Performing reliability calculations and SIL assessments using tools such as SISTEMA * Developing and checking electrical schematics and control drawings (EPLAN preferred) * Programming PLCs/HMIs (Siemens, Rockwell, Schneider) and developing interface logic * Supporting FAT/SAT, commissioning, and troubleshooting activities * Leading design risk assessments and ensuring compliance with BS EN 13849, BS EN 61508, and BS EN 62061 * Mentoring junior engineers and promoting functional-safety best practice * Managing subcontractors and suppliers to maintain technical quality and compliance About you * Degree-qualified in a relevant engineering discipline * Skilled across both hardware (schematics, panels, drives, instrumentation) and software (PLC/HMI) * Sound knowledge of functional safety with experience using tools such as SISTEMA * Familiar with Amtech and modern variable-speed drives * Confident communicator able to lead design reviews and liaise directly with clients * Full UK driving licence and flexibility for occasional site work * Desirable: Chartered status or functional-safety certification, and experience with cranes, heavy machinery, or large-scale automation