Perform concept and detail design for secondary disciplines for a leading EPC
Company Overview
A well-established EPC organisation delivering major infrastructure projects across high-voltage (HV) transmission, substations, and renewable energy.
With a strong project pipeline across Australia, the business plays a key role in supporting grid stability and the transition to renewable generation.
They offer a collaborative, technically focused environment with exposure to complex, large-scale projects.
Role Details
My client is seeking a highly skilled Senior Design Engineer – Secondary Systems to support the delivery of protection, control, automation, and communications design across HV and renewable energy projects.
You will be involved across the full project life cycle, from concept and design through to commissioning, working closely with internal teams and external stakeholders.
Key Responsibilities
Deliver concept and detailed secondary system designs, including studies and documentation
Lead and participate in design reviews across protection, control, automation, and communications
Support cross-disciplinary coordination, including HAZID, HAZOP, and safety-in-design activities
Respond to RFIs and provide technical support to project stakeholders
Contribute to tenders, feasibility studies, and technical investigations
Attend and support FAT, SCAT, and commissioning activities
Collaborate with stakeholders to deliver reliable and efficient secondary system solutions
Assist in developing and reviewing technical specifications and standards




Coordinate with vendors and suppliers to ensure timely delivery of equipment
Support site inspections, construction, and commissioning phases
Drive continuous improvement in design processes and engineering practices
Skills & Experience
6+ years' experience in HV transmission, substations, or renewable infrastructure (Australian experience essential)
Background working with a Network Service Provider (NSP) or EPC/contractor environment
Strong experience in protection & control design, including:
Fault studies and protection coordination
Load flow and insulation coordination
Earthing, lightning protection, and metering systems
Relay configuration and QoSM
Experience with SCADA and automation systems, including:
SCADA Functional Design Specifications (FDS)
Proficiency in AutoCAD
Experience in testing and commissioning of secondary systems (highly regarded)
Familiarity with SCADA protocols such as DNP3 and IEC *******
Solid communication skills with the ability to engage technical and non-technical stakeholders
Why Apply?
Work for a reputable EPC contractor on Tier 1 projects in the energy industry.
Industry-leading salaries
Career development – Pathway to Principal or Lead Engineer
Excellent team culture and relaxed work environment - Flexible hours
Work on mega scale HV projects across HV Substations, BESS, Wind, Solar, and Data Centres
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, to ******
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📌 Senior Secondary Design Engineer – Epc (Sydney)
🏢 Hays
📍 Sydney