Application Guide

How to Apply for Senior System Engineer

at Wartsila

🏢 About Wartsila

Wärtsilä is a global leader in innovative technologies and lifecycle solutions for the marine and energy markets, uniquely positioned at the forefront of the energy transition. Working here means contributing directly to decarbonization and sustainability through cutting-edge battery energy storage systems (BESS), with a strong emphasis on R&D and real-world impact.

About This Role

As a Senior System Engineer, you will be the technical backbone for utility-scale BESS projects, from design through commissioning. Your work directly enables grid-scale renewable integration and energy resilience, making a tangible difference in Australia's clean energy future.

💡 A Day in the Life

You'll start by reviewing project specs and running electrical simulations (load flow, short circuit) in ETAP or PowerFactory. Mid-morning, you'll collaborate with the project team to finalize a bill of materials, then hop on a call with a client to clarify technical requirements. After lunch, you might perform a remote Tier 2 support session for an operational BESS, followed by preparing design criteria for an upcoming tender.

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🎯 Who Wartsila Is Looking For

  • An electrical/power engineer with 3+ years specifically in utility-scale BESS (not just general renewables), comfortable with lithium-ion battery systems and grid interconnection standards.
  • Proficient in ETAP or PowerFactory for load flow, short circuit, and arc flash studies, with a track record of producing accurate bills of materials and system specifications.
  • Experienced in applying AS, IEC, and NEC codes to energy storage projects, and able to translate regulatory requirements into practical design criteria.
  • A collaborative problem-solver who enjoys both desk-based modelling and hands-on site visits for field inspections and Tier 2 technical support.

📝 Tips for Applying to Wartsila

1

Tailor your resume to highlight specific BESS project experience: mention system size (MWh), voltage levels, and your role in electrical design or modelling.

2

In your cover letter, explicitly connect your experience with Australian standards (AS/NZS 4777, AS 3000) and grid connection requirements (AEMO, NSP).

3

Quantify achievements: e.g., 'Reduced BOM costs by 15% through optimized component selection' or 'Completed arc flash studies for 50MW/100MWh BESS.'

4

Showcase familiarity with Wärtsilä's products (e.g., GEMS platform, Quantum energy storage) by mentioning them in your application context.

5

Prepare a portfolio or case study of a BESS project you've worked on, including single-line diagrams, study results, and lessons learned.

✉️ What to Emphasize in Your Cover Letter

['Emphasize your hands-on experience with utility-scale BESS design, including component specification and grid interconnection studies.', "Highlight your proficiency with electrical modelling software (ETAP/PowerFactory) and how you've used it to ensure code compliance and system safety.", "Demonstrate your understanding of Wärtsilä's role in decarbonization and how your skills directly support their mission.", "Mention any experience with site visits, field inspections, or Tier 2 support to show you're prepared for the full project lifecycle."]

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🔍 Research Before Applying

To stand out, make sure you've researched:

  • → Read Wärtsilä's latest white papers on BESS and hybrid power plants to understand their technology roadmap and market focus.
  • → Review recent Wärtsilä BESS projects in Australia (e.g., with AGL, Origin) to grasp typical system scales and grid connections.
  • → Familiarize yourself with the GEMS energy management platform and how it optimizes battery dispatch for revenue stacking.
  • → Check Wärtsilä's sustainability reports and press releases on their 'Path to 100% renewable energy' commitment.

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 Walk me through a BESS project you designed: how did you size the battery and power conversion system, and what standards did you apply?
2 Describe a time you resolved a technical issue during commissioning or a site visit. How did you diagnose and fix it?
3 How would you approach a load flow study for a 100MW BESS connected to a 132kV transmission line? What key parameters matter?
4 Explain your familiarity with lithium-ion battery safety considerations, including thermal runaway prevention and fire codes.
5 How do you stay updated on evolving grid codes (e.g., AEMO updates) and incorporate them into your designs?
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⚠️ Common Mistakes to Avoid

  • Don't submit a generic application: failing to mention BESS or specific software/tools will make you look unfocused.
  • Avoid overstating your experience: if you've only done residential solar, don't claim utility-scale BESS expertise—be honest and show transferable skills.
  • Don't neglect site visit readiness: if you're not comfortable with occasional travel and field work, this role isn't for you.

📅 Application Timeline

This position is open until filled. However, we recommend applying as soon as possible as roles at mission-driven organizations tend to fill quickly.

Typical hiring timeline:

1

Application Review

1-2 weeks

2

Initial Screening

Phone call or written assessment

3

Interviews

1-2 rounds, usually virtual

✓

Offer

Congratulations!

Ready to Apply?

Good luck with your application to Wartsila!

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