Electrified Transit Engineering & DeliveryExpert-built kit

High-Voltage Cable Engineer

Designs cable routing, calculates thermal ratings, specifies insulation standards, coordinates ductbank layouts, and witnesses circuit commissioning.

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Interview content for Senior HV Systems Engineer

28
What to ask. Competency and attitude questions, assigned to the right round.
286
What to listen for. Positive and negative indicators, per question.
7
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 Dive17 competency questions

High-Voltage Cable Engineering & Operations

Asset Lifecycle Management & Reliability Engineering

Implements predictive maintenance strategies, conducts root cause analysis for cable failures, and optimizes lifecycle cost models to extend asset service life.

Expected at Senior HV Systems Engineer

Sample competency question

Describe an instance where you investigated a field failure or degradation in a high-voltage cable system and translated the findings into maintenance practices.

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

Positive indicators

  • Links field evidence to design or installation factors
  • Updates maintenance intervals based on RCA findings
  • Documents lessons learned formally for organization
  • Tracks effectiveness of maintenance changes over time
  • Demonstrates structured RCA process application

Negative indicators

  • Attributes failure to normal wear without investigation
  • Skips material sample testing or lab analysis
  • Implements changes without tracking effectiveness
  • Lacks structured RCA process
  • Ignores systemic design or installation factors

Focuses on post-commissioning optimization; senior engineers contribute to RCA and maintenance planning, but strategic lifecycle modeling is typically a principal-level responsibility.

Ryan Mahoney

Why this role is hard · Ryan Mahoney

Hiring this role goes wrong when we mistake classroom theory for actual job performance. Someone might draw flawless cable routes and substation interfaces on a board, but freeze when you ask how they actually negotiate outage windows with utility operators. We need people who can plainly explain topology shifts to site crews and take ownership when protection settings clash with grid limits. The real measure is seeing if they turn high voltage constraints into steady daily work instead of chasing perfect designs or passing the buck.

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

Level guides for HV Cable Engineer, Senior HV Systems Engineer and Principal HV Infrastructure Engineer.

Before you post

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

In the room

  • 17Competency interview questions
  • 11Attitude interview questions
  • 1Hands-on work simulations
  • 1Presentation prompts
  • 1Coding 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.

17 Competency Questions

1 of 17

  1. Discipline

    High-Voltage Cable Engineering & Operations

  2. Job requirement

    Asset Lifecycle Management & Reliability Engineering

    Implements predictive maintenance strategies, conducts root cause analysis for cable failures, and optimizes lifecycle cost models to extend asset service life.

  3. Expected at Senior HV Systems Engineer

    Focuses on post-commissioning optimization; senior engineers contribute to RCA and maintenance planning, but strategic lifecycle modeling is typically a principal-level responsibility.

Interview round: Hiring Manager Technical Deep Dive

Describe an instance where you investigated a field failure or degradation in a high-voltage cable system and translated the findings into maintenance practices.

Positive indicators

  • Links field evidence to design or installation factors
  • Updates maintenance intervals based on RCA findings
  • Documents lessons learned formally for organization
  • Tracks effectiveness of maintenance changes over time
  • Demonstrates structured RCA process application

Negative indicators

  • Attributes failure to normal wear without investigation
  • Skips material sample testing or lab analysis
  • Implements changes without tracking effectiveness
  • Lacks structured RCA process
  • Ignores systemic design or installation factors

11 Attitude Questions

1 of 11

Accountability Mindset

Accountability Mindset refers to the consistent internalization of personal and professional responsibility for project outcomes, safety compliance, and technical execution. It encompasses proactively owning decisions, transparently communicating risks or deviations, implementing corrective actions without deflection, and ensuring that theoretical designs are faithfully translated into safe, reliable field operations. In high-stakes engineering environments, it manifests as an unwavering commitment to quality assurance, rigorous documentation, and continuous learning from both successes and operational failures.

Interview round: Peer Technical & Field Collaboration

How would you handle a situation where post-commissioning review reveals a minor but systemic deviation from the original design specifications across multiple sites?

Positive indicators

  • Proposes a systematic approach to isolate the systemic cause
  • Prioritizes safety and reliability over schedule or cost recovery
  • Implements standardized updates to prevent future deviations
  • Maintains transparent communication with stakeholders throughout remediation
  • Uses the incident to strengthen repeatable testing protocols

Negative indicators

  • Dismisses the deviation as insignificant without impact assessment
  • Applies site-specific fixes without addressing the systemic pattern
  • Conceals the deviation to avoid project scrutiny
  • Fails to update design standards or commissioning checklists
  • Blames individual sites without examining broader process flaws

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.

Video-Response Questions

1 of 2

Application Screen: Video Response

Describe a time when you had to explain a critical high-voltage cable routing constraint or thermal derating limitation to a municipal planner or utility operator who was pushing for a faster schedule. How did you ensure they understood the technical necessity while maintaining a collaborative partnership?

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
Evidence of designing shielding/bonding schemes, protection relay settings, and fault-current limiting strategies for multi-site transit feeders.
Evidence of mapping grid interconnection points, validating utility studies against depot load profiles, and coordinating feeder capacity upgrades.
Evidence of leading partial discharge diagnostics, conducting forensic root-cause analysis on feeder failures, and implementing predictive maintenance protocols.
Evidence of managing system topology approvals, commissioning sequences, and safety protocols across concurrent transit electrification projects.

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

Live Interview · Coding Test

Without AI

Implement `validate_interconnection` to check if a proposed connection exceeds fault current limits or thermal margins. Return a dictionary with compliance status, limiting factor, and recommended actions. Handle edge cases like missing sensor data or zero-impedance faults.

Write a function that evaluates grid interconnection compliance against fault current limits and thermal ratings. Return a structured report with pass/fail status and actionable recommendations.

With AI

Use AI to draft the initial validation function, then refactor it into a modular `GridInterconnectionAnalyzer` class. The analyzer must ingest real-time SCADA streams, predict thermal bottlenecks, and propose rerouting strategies. You must handle partial data gracefully, document which AI suggestions you adapted or discarded, and justify your approach to API surface design.

Architect a streaming analyzer that predicts bottlenecks and proposes rerouting. Implement extensible validation strategies, handle partial SCADA data, and design an API surface that supports future protection relay integrations. Explain your tradeoff decisions.

Response time

20 min

Positive indicators

  • Clear conditional logic separating fault and thermal checks
  • Graceful handling of missing or zero-value inputs
  • Actionable, prioritized recommendations in the output
  • Consistent dictionary structure and type hints
  • Clean separation of ingestion, validation, and routing proposal logic
  • Explicit handling of partial or delayed SCADA data without blocking analysis
  • Well-documented rejection of AI-generated tight coupling or global state
  • Clear justification for API extensibility and strategy pattern adoption

Negative indicators

  • Hardcoded thresholds without parameterization
  • Swallowing exceptions or returning vague error strings
  • Inconsistent output structure across pass/fail states
  • Failing to distinguish between fault and thermal violations
  • Uncritically merging AI code into a single monolithic function
  • Failing to handle missing telemetry gracefully
  • Overly rigid API design that blocks future relay integrations
  • Lack of documented reasoning for architectural modifications

Presentation Prompt

Prepare a short deck and walk us through a past project where you designed or validated a grid interconnection for a high-voltage transit charging depot. Discuss how you mapped utility constraints, coordinated protection settings, and managed commissioning sequences across multiple stakeholders.

Format

deck-and-walkthrough · 20 min · ~2 hr prep

Audience

Hiring manager, Principal infrastructure engineer, Utility coordination lead

What to prepare

  • 3-5 slides summarizing the project context, your role, key technical challenges, and outcomes
  • Anonymized diagrams or interconnection study excerpts if available
  • Talking points on stakeholder alignment and risk mitigation

Deliverables

  • A concise narrative walkthrough of your interconnection strategy
  • Discussion of how you balanced utility requirements with transit operational timelines

Ground rules

  • Keep the deck high-level; focus on your reasoning and decision points
  • Redact any confidential utility or client data before sharing
  • Emphasize your role in system-level integration and cross-functional coordination

Scoring anchors

Exceeds
Demonstrates mastery of utility interface protocols, anticipates grid stability risks, and shows how they proactively aligned engineering, utility, and operations teams to accelerate commissioning.
Meets
Provides a clear, structured walkthrough of a past interconnection project, explains protection coordination and utility alignment steps, and acknowledges key tradeoffs.
Below
Delivers a superficial project summary, cannot articulate technical integration details, and lacks awareness of utility coordination or commissioning sequencing challenges.

Response time

20 min

Positive indicators

  • Clearly maps the dependency chain between utility capacity, protection relays, and depot load profiles
  • Surfaces assumptions about utility lead times and mitigation strategies for delays
  • Demonstrates how they aligned technical specs with operational commissioning schedules
  • Articulates clear escalation paths for interconnection bottlenecks

Negative indicators

  • Presents a generic project timeline without addressing technical integration challenges
  • Blurs roles between utility, contractor, and internal engineering teams
  • Fails to explain how protection settings were validated against actual load profiles
  • Overlooks regulatory or permitting constraints in the interconnection process

Work Simulation Scenario

Scenario. A newly commissioned 15 kV MV circuit serving a transit depot has triggered intermittent partial discharge (PD) alarms during VLF pre-energization testing. The commissioning schedule is tight, and operations is pushing to energize.

Problem to solve. Drive the diagnostic investigation to determine whether the PD signatures indicate genuine insulation degradation, environmental interference, or test setup artifacts, and decide whether to proceed, hold, or modify the commissioning sequence.

Format

discovery-interview · 40 min · ~2 hr prep

Success criteria

  • Ask precise diagnostic questions about PD magnitude, phase correlation, and environmental conditions
  • Differentiate between true insulation defects and external noise or artifacts
  • Make a clear go/no-go recommendation grounded in safety and reliability protocols

What to review beforehand

  • VLF and PD testing fundamentals
  • Common PD pattern types including internal, surface, and corona
  • Commissioning hold and release decision frameworks

Ground rules

  • Conversational discovery format; you drive the diagnostic questioning
  • Partner provides honest, direct answers but will not volunteer unasked data
  • Focus on your analytical reasoning and risk management judgment

Roles in scenario

Marcus Lin, Lead Commissioning Technician (informed_partner, played by peer)

Motivation. Ensure the circuit is safely commissioned without unnecessary delays, while preventing catastrophic insulation failure under load.

Constraints

  • PD readings show 50-150 pC spikes, intermittent across phases
  • Testing is conducted in a partially enclosed manhole with high ambient humidity
  • VLF test set calibration was verified 48 hours ago
  • Operations demands energization within 48 hours to meet fleet rollout

Tensions to introduce

  • PD pulses are not synchronized with voltage phase angle
  • Recent heavy rain increased manhole condensation
  • Termination splices were installed by a new crew under a tight schedule
  • No baseline PD data exists for this cable run

In-character guidance

  • Answer only what is asked; provide exact PD values, humidity levels, and crew details when queried
  • If asked about phase correlation, confirm the lack of synchronization
  • If asked about crew experience, confirm they were newly certified but supervised
  • If asked about calibration history, confirm it was within spec
  • Maintain a factual, slightly time-pressured tone

Do not

  • Do not suggest the PD is harmless or dangerous without being asked for an assessment
  • Do not volunteer that condensation might be causing surface tracking
  • Do not offer to retest with a different frequency or setup unless prompted
  • Do not coach the candidate on PD diagnostic thresholds

Scoring anchors

Exceeds
Rapidly isolates root causes through targeted diagnostic questions, accurately distinguishes artifacts from genuine degradation, and issues a clear, safety-aligned commissioning decision with actionable next steps.
Meets
Asks relevant questions about PD patterns and environmental conditions, considers test setup variables, and provides a reasonable go or hold recommendation based on available data.
Below
Makes assumptions without diagnostic validation, overlooks environmental or calibration factors, fails to distinguish PD types, or yields to schedule pressure without a clear risk assessment.

Response time

40 min

Positive indicators

  • Asks high-signal questions about PD phase correlation, pulse magnitude, and environmental humidity before drawing conclusions
  • Differentiates between internal insulation defects, surface tracking, and external interference
  • Evaluates test setup integrity and calibration status as part of the diagnostic process
  • Makes a clear, safety-first go, hold, or modify recommendation with explicit next steps
  • Balances operational pressure with rigorous commissioning standards

Negative indicators

  • Assumes PD is benign or critical without verifying phase correlation or environmental factors
  • Ignores the impact of manhole humidity and condensation on test readings
  • Fails to question test equipment calibration or setup configuration
  • Recommends energization without a clear diagnostic path or hold criteria
  • Freezes under schedule pressure, unable to structure a logical troubleshooting sequence

Progression Framework

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

High-Voltage Cable Engineering & Operations

7 competencies

CompetencyHV Cable EngineerSenior HV Systems EngineerPrincipal HV Infrastructure Engineer
Asset Lifecycle Management & Reliability Engineering

Maintains accurate asset records, supports routine maintenance schedules, and processes failure reports according to established protocols.

Implements predictive maintenance strategies, conducts root cause analysis for cable failures, and optimizes lifecycle cost models to extend asset service life.

Drives enterprise asset management strategy, embeds sustainability and circular economy metrics into planning, and sets long-term reliability targets for critical networks.

Cable Design & Electrical Engineering Principles

Applies standard electrical principles and design codes to specify cable components, perform basic load calculations, and draft technical drawings under supervision.

Leads complex cable design initiatives, optimizes conductor sizing and insulation selection, and resolves non-standard engineering challenges across diverse grid environments.

Establishes enterprise-wide design standards, drives innovation in next-generation cable materials, and aligns engineering practices with long-term infrastructure resilience goals.

Grid Interconnection & Substation Interface

Assists in designing and verifying interconnection points, drafting termination layouts, and checking basic protection coordination requirements.

Engineers robust grid integration solutions, manages fault current contributions, and ensures seamless protection relay coordination between cables and switchgear.

Directs macro-level grid integration strategies, aligning HV cable infrastructure with regional microgrid objectives and renewable energy interconnection mandates.

Installation Planning & Construction Execution

Executes installation plans, monitors daily construction activities, and verifies compliance with safety and technical specifications in the field.

Manages end-to-end construction workflows, optimizes trenching and pulling methodologies, and resolves complex site constraints and multi-trade coordination issues.

Defines strategic construction execution frameworks, standardizes deployment methodologies across capital programs, and integrates advanced project delivery models.

Project Coordination & Stakeholder Interface Management

Facilitates routine coordination meetings, tracks interface requirements, and maintains documentation across engineering and field teams.

Manages complex cross-functional interfaces, negotiates technical agreements, and resolves multidisciplinary conflicts to maintain project momentum.

Orchestrates strategic stakeholder alignment, establishes policy-level interface governance, and advises executive leadership on multi-agency infrastructure initiatives.

System Architecture & Routing Optimization

Supports routing studies and system modeling using standard software to identify viable cable pathways and document spatial constraints.

Architects integrated cable routing solutions, balancing thermal, mechanical, and electromagnetic constraints across congested urban or industrial corridors.

Pioneers advanced system architecture frameworks, integrating digital twin technologies and predictive spatial analytics to future-proof grid networks.

Testing, Commissioning & Diagnostic Evaluation

Conducts standard field and factory acceptance tests, documents results accurately, and identifies basic anomalies for escalation.

Develops comprehensive testing protocols, leads complex commissioning sequences, and performs advanced partial discharge and fault location diagnostics.

Establishes enterprise testing standards, integrates AI-driven diagnostic methodologies, and defines predictive commissioning frameworks for critical infrastructure.