Interview scorecard template

Energy Storage Systems Engineer interview scorecard

Evaluate Energy Storage Systems Engineer candidates across 4 weighted areas: technical depth, work that shipped, diagnosis under uncertainty, and working across the org. Technical depth leads at 35%, so probe cell chemistry trade-offs (LFP versus NMC), BMS architecture, SOC and SOH estimation methods, DC versus AC coupling, and command of UL. Use the rubric to compare role-specific evidence consistently.

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engineering applied sciencebattery energy storagebmscell degradationnfpa 855
TL;DR
For technical depth, look for evidence the candidate explains degradation mechanisms and round-trip efficiency losses numerically, and cites specific clauses of NFPA 855 or UL 9540A from real project work. For work that shipped, look for evidence the candidate names commissioned sites with MW/MWh figures, measured availability, and their own deliverables such as thermal, protection or EMS dispatch design. Apply the written 1–5 anchors to every answer, record the evidence behind each rating, and use the factor weights to reach a consistent overall assessment.
Complete evaluation framework

What to assess and how to score it

Review the evidence signals before interviewing. Then use the anchored descriptions—not instinct alone—to choose the score that best matches each answer.

01
Evaluation factor

Technical depth

35% weight

Probe cell chemistry trade-offs (LFP versus NMC), BMS architecture, SOC and SOH estimation methods, DC versus AC coupling, and command of UL 9540A, NFPA 855 and IEC 62619.

Evidence to listen for

  • Explains the physics or mechanism behind their work, not just the tooling
  • Names the standards, tolerances, and constraints they designed against
  • Can defend a design decision under follow-up questions
  • Distinguishes what they personally engineered from what the team delivered

Five-point scoring guide

1
Poor

Cannot explain the fundamentals of their own stated specialism.

2
Needs Improvement

Knows the vocabulary but not the underlying mechanism; struggles under follow-ups.

3
Satisfactory

Solid working knowledge for the role; depth thins out on edge cases.

4
Very Good

Strong command of the domain; explains trade-offs and defends decisions well.

5
Excellent

Explains degradation mechanisms and round-trip efficiency losses numerically, and cites specific clauses of NFPA 855 or UL 9540A from real project work.

02
Evaluation factor

Work that shipped

30% weight

Ask which BESS projects reached commissioning: MWh rating, PCS and container vendors, capacity test results against warranty guarantees, and augmentation or throughput plans they authored.

Evidence to listen for

  • Names specific programmes, parts, or systems that reached production or field use
  • States their own scope inside the project
  • Can give measured outcomes: yield, cycle time, cost, failure rate
  • Explains what went wrong and what they changed

Five-point scoring guide

1
Poor

No delivered work; experience is coursework, lab-only, or purely observational.

2
Needs Improvement

Contributed to projects but cannot say what shipped or what their part was.

3
Satisfactory

Has delivered real work; outcomes described without numbers.

4
Very Good

Names shipped work and their scope, with some measured results.

5
Excellent

Names commissioned sites with MW/MWh figures, measured availability, and their own deliverables such as thermal, protection or EMS dispatch design.

03
Evaluation factor

Diagnosis under uncertainty

20% weight

Test how they chased down anomalies: cell voltage divergence, unexplained SOH drop, HVAC short cycling, false BMS trips, or PCS faults with thin SCADA data.

Evidence to listen for

  • Describes a real failure they chased to root cause
  • Shows a method: isolate variables, reproduce, measure, eliminate
  • Distinguishes correlation from cause
  • Says what they ruled out and why, not only what the answer turned out to be

Five-point scoring guide

1
Poor

No diagnostic method; guesses or escalates immediately.

2
Needs Improvement

Trial and error with no structure; cannot explain how they narrowed the cause.

3
Satisfactory

Reasonable method on familiar problems; less structured on novel ones.

4
Very Good

Clear systematic approach with a real root-cause story.

5
Excellent

Walks through a real fault from field data to root cause, naming the measurements taken and hypotheses eliminated along the way.

04
Evaluation factor

Working across the org

15% weight

Look for work with EPC contractors, cell suppliers, fire marshals and grid interconnection teams, including how they handled vendor warranty disputes or AHJ permitting pushback.

Evidence to listen for

  • Explains technical constraints to non-technical stakeholders without condescension
  • Has negotiated scope, cost, or timeline with manufacturing, product, or suppliers
  • Documents decisions so others can act on them
  • Takes review feedback without defensiveness

Five-point scoring guide

1
Poor

Cannot communicate outside their specialism; dismissive of other functions.

2
Needs Improvement

Communication gaps cause rework; avoids stakeholder contact.

3
Satisfactory

Works adequately with other teams; documentation is thin.

4
Very Good

Communicates clearly across functions; reliable collaborator.

5
Excellent

Describes concrete negotiations with cell OEMs or authorities having jurisdiction and how technical evidence changed the outcome.

Evidence-led prompts

Interview questions for a Energy Storage Systems Engineer

Use these prompts to surface evidence for the weighted factors above and compare candidates against the same role-specific criteria.

  1. 01

    Which energy storage technologies are you most familiar with?

  2. 02

    Can you explain your experience with battery management systems?

  3. 03

    How do you manage thermal design in energy storage systems?

  4. 04

    Can you describe a project where you designed or delivered an energy storage system?

  5. 05

    Describe your experience with grid-connected and off-grid storage.

See the complete Energy Storage Systems Engineer question set
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