Electrified Transit Engineering & DeliveryExpert-built kit

Arc Flash / Power Systems Studies Engineer

Conducts field data collection, builds power system models, and performs short-circuit and arc flash analysis.

Interview content for Lead Studies Engineer

31
What to ask. Competency and attitude questions, assigned to the right round.
190
What to listen for. Positive and negative indicators, per question.
8
What the hire must do. Capabilities with expected proficiency at each level.

Look inside: one question, as it appears in the kit

Pick the level you’re hiring. The sample changes with the level you select.

Round 2 · Hiring Manager Technical Deep Dive19 competency questions

Grid Integration Compliance and Strategic Operations

Energy Storage Integration & Compliance

Designs advanced storage integration scenarios, optimizes charge/discharge strategies for grid support, and resolves complex compliance deviations.

Expected at Lead Studies Engineer

Sample competency question

Recall a project where you integrated a battery energy storage system into an existing transit power network. How did you validate its grid support capabilities and address interconnection compliance issues?

Ask once, as written, then allow silence. A helpful rephrase may hand the candidate the answer.

Positive indicators

  • References IEEE 1547 or utility-specific standards
  • Proposes phased commissioning and testing protocols

Negative indicators

  • Treats BESS as static generation source
  • Ignores inverter fault current limitations
  • Lacks utility coordination documentation

BESS integration involves complex charge/discharge optimization and resolving compliance deviations, requiring advanced technical judgment and grid code expertise.

Ryan Mahoney

Why this role is hard · Ryan Mahoney

Finding a lead studies engineer for transit corridors is tougher than most hiring managers expect. You need someone comfortable stepping into a grimy switchgear room, pulling accurate impedance readings, and clearly explaining how a single breaker change affects the entire rail line. Real problems emerge when engineers stay silent about unsafe arc flash zones or ignore field reports of intermittent faults. We often watch candidates nail the ETAP modeling exercise yet panic when pressured to rush a project past safety limits. Solid judgment comes down to trusting your short circuit calculations enough to shut down work until the protection plan actually keeps crews safe.

Everything in the download, in the order you’ll use it

Level guides for Power Studies Engineer, Lead Studies Engineer and Arc Flash Technical Authority.

Before you post

  • 1Ready-to-use job description
  • 2Video screening prompts
  • 8Resume screening criteria
  • 2Knockout screening questions

In the room

  • 19Competency interview questions
  • 12Attitude interview questions
  • 1Hands-on work simulations
  • 1Presentation prompts
  • 2Coding tests

At the debrief

  • Progression framework
  • Exceeds / Meets / Below anchors for every exercise
  • 3Interview plan with time per round

Core Evaluation

Critical questions for this role

The competency and attitude questions below are where the hiring decision is made. They run in the live interview rounds and are calibrated to the level selected above.

19 Competency Questions

1 of 19
  1. Discipline

    Grid Integration Compliance and Strategic Operations

  2. Job requirement

    Energy Storage Integration & Compliance

    Designs advanced storage integration scenarios, optimizes charge/discharge strategies for grid support, and resolves complex compliance deviations.

  3. Expected at Lead Studies Engineer

    BESS integration involves complex charge/discharge optimization and resolving compliance deviations, requiring advanced technical judgment and grid code expertise.

Interview round: Hiring Manager Technical Deep Dive

Recall a project where you integrated a battery energy storage system into an existing transit power network. How did you validate its grid support capabilities and address interconnection compliance issues?

Positive indicators

  • References IEEE 1547 or utility-specific standards
  • Proposes phased commissioning and testing protocols

Negative indicators

  • Treats BESS as static generation source
  • Ignores inverter fault current limitations
  • Lacks utility coordination documentation

12 Attitude Questions

1 of 12

Accountability Mindset

A consistent professional orientation toward owning decisions, work products, and outcomes by proactively identifying risks, transparently communicating limitations, and implementing corrective actions without deflection. In power systems engineering, it manifests as rigorous validation of technical assumptions, strict adherence to safety and compliance standards, and a commitment to resolving discrepancies between modeled predictions and field realities through structured feedback loops.

Interview round: Recruiter Screen

If a protection scheme you approved later shows unexpected coordination failures during routine testing, what actions do you take to own and resolve the issue?

Positive indicators

  • Takes immediate ownership of the failure
  • Publishes transparent corrective documentation
  • Uses incident to improve network-wide processes

Negative indicators

  • Blames testing procedures or junior analysts
  • Issues ad-hoc fixes without formal documentation
  • Fails to update master models or assumptions

Supporting Evaluation

How candidates earn the selection conversation

The goal is to reduce effort for everyone by collecting more useful signals before adding more interviews. Lightweight application prompts and structured screens help your team focus interview time on the candidates most likely to succeed.

Stage 1 · Application

Filter at the door

Runs the moment a candidate hits Submit. Disqualifying answers end the application; everything else is captured for review.

Knock-out Questions

1 of 2

Application Screen: Knock-out

Do you hold a current, active Professional Engineer (PE) license in the United States?

Yes
Qualifies
No
Auto-decline

Video-Response Questions

1 of 2

Application Screen: Video Response

Describe a situation where you had to present complex arc flash incident energy calculations or protective device coordination results to maintenance supervisors or project managers who lacked deep electrical engineering backgrounds. What specific steps did you take to ensure they understood the safety boundaries and PPE requirements, and how did you adjust your communication approach when you noticed confusion or pushback regarding the proposed hazard zones?

Candidate experience

REC
0:42 / 2:00
1Record
2Review
3Submit

Response time

2 min

Format

Recorded video

Stage 2 · Resume Screening

Read the resume against fixed criteria

Reviewers score every application that clears the door against the same criteria. Stronger reviews advance to live interviews; weaker ones are archived without further screening.

Resume Review Criteria

8 criteria
Demonstrated capability to architect high-fidelity ETAP simulations for electric bus depots, incorporating dynamic load profiles and OEM datasheets.
Experience calculating arc flash hazards for complex systems including BESS integration and evaluating thermal/fault impacts on adjacent equipment.
Authority to approve protective device settings, modify study boundaries, and authorize PPE program updates based on study outcomes.
Evidence of guiding junior analysts, enforcing standardized modeling workflows, and prioritizing electrification roadmaps.

Does the resume show relevant prior work experience?

Is the resume complete, well-organized, and free from formatting, spelling, and grammar mistakes?

Does the resume indicate required academic credentials, relevant certifications, or necessary training?

Does the cover letter or personal statement convey clear relevance and familiarity with the job?

Stage 3 · During Interviews

Where the hire is decided

Interview rounds use the competency and attitude questions outlined above, then add tests, work simulations, and presentations that reveal deeper evidence about how the candidate thinks and works.

Coding Test

1 of 2

Live Interview · Coding Test

Without AI

Implement the core calculation and coordination check. Focus on clear function signatures, accurate decay modeling, and readable output.

Implement a function that models BESS fault current contribution during a short-circuit event. Parse battery array parameters, calculate DC fault decay, and determine if upstream breakers trip within required coordination windows.

With AI

Use AI for boilerplate, but architect the service to handle OEM variability, thermal limits, and compliance mapping. Justify your design.

Architect a modular BESS fault analysis service that accommodates varying OEM discharge curves, state-of-charge dependencies, and thermal derating limits. Integrate a compliance checker that maps results to NFPA 70E/IEEE 1584 thresholds and produces an extensible API for downstream study tools. AI will likely produce a monolithic script with hardcoded decay rates. Discuss your abstraction boundaries and how you handle OEM data variability.

Response time

20 min

Positive indicators

  • Accurate exponential decay implementation
  • Clear SOC scaling logic
  • Proper coordination window comparison against breaker curve data
  • Clean, well-documented return structure
  • Configurable OEM curve loader with clear interface
  • Explicit thermal derating integration
  • Compliance mapping layer separate from physics calculation
  • Strong justification for rejecting monolithic AI output

Negative indicators

  • Linear decay assumption instead of exponential
  • Ignoring SOC impact on fault current
  • Hardcoded breaker thresholds
  • Poorly structured or undocumented output
  • Accepting AI's single-function approach
  • No thermal or OEM variability handling
  • Compliance logic tangled with calculation code
  • Inability to explain abstraction boundaries

Presentation Prompt

Talk us through your approach to designing protective device settings that prevent nuisance tripping during high-power DC fast charger inrush currents, while balancing operational uptime with personnel safety across multiple depot corridors. Slides are optional; please feel free to walk us through your reasoning conversationally.

Format

approach-walkthrough · 20 min · ~2 hr prep

Audience

Senior engineering leadership and cross-functional safety stakeholders

What to prepare

  • A structured verbal outline of your problem framing, key assumptions, data validation steps, and trade-off considerations
  • Optional: 1-2 hours reviewing relevant coordination study methodologies or past project contexts to ground your narrative

Deliverables

  • A structured verbal walkthrough of your reasoning process
  • Clarifying questions to define the problem constraints
  • A discussion of trade-offs, validation steps, and escalation criteria

Ground rules

  • Focus on your reasoning process and decision framework rather than producing a final deliverable
  • Use only hypothetical scenarios or anonymized past experiences you are permitted to share
  • Slides are optional; a conversational walkthrough is fully acceptable

Scoring anchors

Exceeds
Frames the coordination problem comprehensively, proactively identifies hidden grid risks, demonstrates rigorous validation steps, and clearly articulates trade-offs with actionable escalation criteria.
Meets
Presents a logical, standards-aligned approach, acknowledges key constraints, and outlines a reasonable validation and communication process.
Below
Offers a fragmented or purely theoretical solution, overlooks critical safety/regulatory constraints, and struggles to explain how assumptions would be verified or communicated.

Response time

20 min

Positive indicators

  • Asks high-information clarifying questions to define constraints before proposing a solution
  • Explicitly surfaces assumptions and explains how they would validate them with field telemetry or OEM inrush data
  • Walks through a structured methodology that balances operational uptime with personnel safety
  • Identifies key trade-offs and articulates clear criteria for when to escalate or halt work

Negative indicators

  • Jumps directly to a technical solution without framing the problem or acknowledging constraints
  • Ignores safety or regulatory boundaries in favor of schedule or cost pressures
  • Fails to articulate how they would validate assumptions or reconcile conflicting data sources
  • Communicates in overly dense jargon without translating implications for cross-functional stakeholders

Work Simulation Scenario

Scenario. A major transit agency is deploying a fleet-wide battery energy storage system (BESS) to support depot peak shaving and emergency backup. You need to integrate the BESS models into ETAP to evaluate DC arc flash hazards and protective device coordination. OEM fault current data varies significantly across different state-of-charge conditions, and the utility has imposed strict interconnection limits. How do you structure your analysis and validation approach?

Problem to solve. Develop a methodology to accurately model dynamic BESS fault contributions, reconcile OEM data discrepancies, and ensure protective coordination aligns with both DC arc flash safety standards and utility interconnection requirements.

Format

discovery-interview · 40 min · ~2 hr prep

Success criteria

  • Surface critical assumptions about BESS discharge curves and fault current contributions
  • Establish a validation framework for OEM data under varying SOC conditions
  • Define escalation paths for utility compliance conflicts and safety margin tradeoffs

What to review beforehand

  • BESS integration fundamentals and DC arc flash hazards
  • Protective device coordination for inverter-based resources
  • Utility interconnection agreement constraints

Ground rules

  • Ask high-information clarifying questions to scope the problem
  • The partner will not volunteer constraints unless asked
  • Focus on analytical rigor, safety boundaries, and cross-functional alignment

Roles in scenario

Informed Partner (BESS OEM Integration Lead & Utility Interconnection Engineer) (informed_partner, played by cross_functional)

Motivation. Ensure the BESS model accurately reflects real-world performance without overcomplicating the study or triggering unnecessary utility review delays.

Constraints

  • OEM data is proprietary and incomplete for extreme SOC states
  • Utility interconnection window is tight
  • BESS cooling loads impact thermal modeling

Tensions to introduce

  • OEM provides conservative fault current data that conflicts with utility short-circuit limits
  • Utility engineer questions the DC arc flash boundary calculations
  • Project timeline pressures you to skip dynamic simulation steps

In-character guidance

  • Provide technical details only when prompted
  • Maintain a collaborative but constraint-driven tone
  • Acknowledge safety concerns but emphasize schedule realities

Do not

  • Do not provide the complete fault current dataset upfront
  • Do not solve the coordination problem for the candidate
  • Do not withhold safety-critical information when directly asked

Scoring anchors

Exceeds
Candidate constructs a robust dynamic modeling methodology, explicitly reconciles OEM and utility constraints, defines clear safety escalation triggers, and maintains analytical integrity under schedule pressure.
Meets
Candidate asks relevant clarifying questions, proposes a structured validation approach, acknowledges key interconnection constraints, and identifies reasonable paths for handling data discrepancies.
Below
Candidate accepts incomplete data without verification, ignores utility constraints, fails to address DC arc flash safety margins, or prioritizes timeline over technical rigor without justification.

Response time

40 min

Positive indicators

  • Surfaces assumptions about BESS discharge curves and fault current contributions under varying SOC conditions
  • Proposes a validation framework that cross-references OEM data with utility short-circuit limits
  • Establishes clear safety boundaries and escalation paths for coordination conflicts
  • Balances analytical rigor with project timeline constraints without compromising DC arc flash safety margins

Negative indicators

  • Accepts OEM fault current data at face value without proposing dynamic simulation or sensitivity analysis
  • Ignores utility interconnection constraints when defining protective device settings
  • Fails to define escalation criteria for safety vs. schedule tradeoffs
  • Proposes overly conservative assumptions that unnecessarily complicate the study or trigger utility delays

Progression Framework

This table shows how competencies evolve across experience levels. Each cell shows competency at that level.

Grid Integration Compliance and Strategic Operations

4 competencies

CompetencyPower Studies EngineerLead Studies EngineerArc Flash Technical Authority
Energy Storage Integration & Compliance

Performs baseline BESS impact studies and documents compliance requirements for standard interconnection requests.

Designs advanced storage integration scenarios, optimizes charge/discharge strategies for grid support, and resolves complex compliance deviations.

Sets enterprise BESS integration standards, leads regulatory engagement on emerging storage safety codes, and approves high-impact grid tie designs.

Operational Incident Response & Risk Analytics

Documents operational incidents, assists in data collection for root cause analysis, and runs basic risk screening models.

Leads post-incident technical investigations, develops corrective action plans, and implements advanced probabilistic risk assessments.

Architects enterprise incident response frameworks, establishes risk tolerance thresholds, and directs strategic resilience planning across the network.

Regulatory Compliance & Standards Management

Tracks regulatory updates, maintains compliance checklists, and supports documentation for standard audits.

Interprets complex regulatory changes, develops compliance implementation roadmaps, and coordinates cross-functional audit preparations.

Represents the organization in standards committees, authors internal compliance directives, and provides final technical sign-off on regulatory adherence.

Strategic Network Planning & Optimization

Supports data gathering for capacity forecasts, runs baseline optimization scenarios, and prepares planning reports.

Develops multi-year network expansion strategies, evaluates trade-offs between reliability and cost, and leads stakeholder alignment workshops.

Defines enterprise planning horizons and investment criteria, authors strategic network roadmaps, and advises executive leadership on long-term infrastructure resilience.

Power Systems Modeling and Safety Analysis

4 competencies

CompetencyPower Studies EngineerLead Studies EngineerArc Flash Technical Authority
Arc Flash Hazard Assessment & Mitigation

Applies standard calculation methods to determine incident energy levels and generates preliminary safety labels.

Evaluates mitigation alternatives, coordinates protective device settings to reduce hazard levels, and validates compliance with safety standards.

Develops site-wide arc flash mitigation programs, authors enterprise safety protocols, and provides technical arbitration on complex hazard scenarios.

Field Data Acquisition & System Modeling

Executes standardized field data collection routines and populates baseline system models using established templates.

Validates complex multi-site datasets, resolves data inconsistencies, and optimizes model topology for accuracy and computational efficiency.

Defines enterprise data acquisition standards, validates model integrity across diverse network configurations, and mentors teams on advanced modeling techniques.

Load Flow & Short Circuit Analysis

Runs standard load flow and short circuit simulations using predefined scenarios and interprets baseline outputs.

Designs complex fault scenarios, analyzes contingency impacts, and recommends system modifications to address thermal or voltage violations.

Establishes simulation methodologies for extreme fault conditions, validates results against utility standards, and authorizes critical equipment ratings.

Transit Electrification Network Studies

Supports modeling of charging load profiles and basic traction power network configurations under supervision.

Leads integrated transit network simulations, optimizes charging schedules, and resolves grid-tie capacity constraints.

Architects comprehensive electrification study frameworks, establishes transit-specific safety and performance benchmarks, and advises on capital planning.