Interview scorecard template

Water Technology Specialist interview scorecard

Evaluate Water Technology Specialist candidates across 4 weighted areas: technical depth, work that shipped, diagnosis under uncertainty, and working across the org. Technical depth leads at 35%, so check command of water chemistry: Langelier and Ryznar indices, RO membrane fouling versus scaling, chlorine dioxide dosing, ion exchange regeneration, and ASHRAE 188. Use the rubric to compare role-specific evidence consistently.

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engineering applied scienceboiler cooling chemistrylegionella controlreverse osmosiswater treatment
TL;DR
For technical depth, look for evidence the candidate explains cycles of concentration, silt density index limits and inhibitor selection with numbers, not vendor slogans or generic chemistry. For work that shipped, look for evidence the candidate names specific plants and quantified outcomes: recovery lifted, blowdown cut, membrane life extended, discharge consents met. 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

Check command of water chemistry: Langelier and Ryznar indices, RO membrane fouling versus scaling, chlorine dioxide dosing, ion exchange regeneration, and ASHRAE 188 or L8 legionella requirements.

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 cycles of concentration, silt density index limits and inhibitor selection with numbers, not vendor slogans or generic chemistry.

02
Evaluation factor

Work that shipped

30% weight

Ask for commissioned systems: RO or ultrafiltration skids, cooling tower programmes, ZLD or effluent plants, with capacity, recovery rate and chemical cost per cubic metre delivered.

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 specific plants and quantified outcomes: recovery lifted, blowdown cut, membrane life extended, discharge consents met.

03
Evaluation factor

Diagnosis under uncertainty

20% weight

Probe how they traced a problem: sudden conductivity spike, boiler carryover, microbial counts breaching limits, or differential pressure climb across a membrane train.

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 sampling, jar tests, autopsy of a fouled element and data trending before naming a root cause.

04
Evaluation factor

Working across the org

15% weight

Assess dealings with plant operators, EHS teams, chemical suppliers and regulators during audits, water risk assessments or discharge permit renewals.

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 training operators on dosing logs and negotiating corrective actions with site management and inspectors without escalation.

Evidence-led prompts

Interview questions for a Water Technology Specialist

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

  1. 01

    Can you describe your experience designing and maintaining water treatment systems?

  2. 02

    Have you worked on projects involving wastewater management or reuse?

  3. 03

    Can you describe a challenging problem you solved in water technology?

  4. 04

    Which water purification technologies are you most familiar with?

  5. 05

    Can you explain reverse osmosis and where it is appropriate?

See the complete Water Technology Specialist question set
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