Engineering Design interview prep.

Mechanical / electrical / electronics / software / mechatronics design engineers building components + sub-systems for OEMs - powertrain, chassis, body + interior, electronics + ECU, ADAS sensors, e-mobility (battery, inverter, motor), thermal + HVAC, safety systems.

What interviewers look for

  • Can the candidate translate an OEM SOR into a producible component design under cost + timing pressure?
  • Do they know APQP phases + PPAP elements + DV / PV testing cold?
  • Are they fluent in DFMEA / PFMEA + GD&T + Cpk + statistical tolerancing?
  • Do they understand ISO 26262 (for safety-relevant) + ASPICE (for software) + IATF 16949?
  • Can they navigate OEM customer-engineering interactions - SOR walk-downs, change negotiation, late changes?
  • Are they design-to-cost disciplined - piece price, BOM walk, VAVE post-launch?
  • Long-game fit - design engineer / lead / chief engineer / program technical lead trajectory?

Behavioural questions to expect

  1. Walk me through your engineering background + automotive supplier experience.

    What it tests: Story arc + supplier-context awareness - WHY: interviewers screen out candidates who pitch generic engineering with no OEM-customer or APQP discipline.

  2. Tell me about a component or sub-system program you've designed.

    What it tests: Program thinking - SOR-to-SOP arc, design + DV / PV + PPAP, customer + Tier 2 management.

  3. Why automotive supplier design vs OEM / aerospace / consumer engineering?

    What it tests: Authentic alignment - multi-OEM customer exposure, deep component ownership, cost discipline, electrification + ADAS transformation.

  4. Why this product family - powertrain / chassis / safety / electronics / e-mobility / interior?

    What it tests: Specificity. Generic 'I like cars' answers fail.

  5. Why this firm?

    What it tests: Real homework - product, OEM customer base, recent program wins, engineering culture - not name-drop.

  6. What's your read on our product portfolio + key OEM customers + recent program wins?

    What it tests: Supplier-industry literacy - product position, OEM mix, electrification / ADAS posture, competitive landscape.

  7. Tell me what you understand about our engineering culture + APQP discipline.

    What it tests: Engineering org maturity - design vs program vs application, APQP / PPAP rigor, ISO 26262 / ASPICE maturity, global tech-center model.

  8. Walk me through how you took an OEM SOR + design input to a producible component.

    What it tests: SOR / RFQ engineering fluency - customer requirement interpretation, gap analysis, design concept, DV / PV, PPAP arc - WHY: this is the daily work of a supplier design engineer.

Technical concepts to master

SOR-to-PPAP supplier program arc

Statement of Requirements (SOR)
OEM-provided document defining technical, commercial, timing + quality requirements for the supplied component.
RFQ engineering response
Pre-award technical + commercial proposal - design concept, feasibility, piece price, tooling, timing.
Design Verification (DV) + Product Validation (PV)
DV proves the design meets requirements; PV proves production parts meet requirements over life.
Production Part Approval Process (PPAP)
OEM-required submission package - 18 elements at Level 3 / 4 - culminating in PSW signature.

DFMEA + GD&T + Cpk + statistical tolerancing

DFMEA (Design FMEA)
Systematic analysis of design failure modes - Severity, Occurrence, Detection scores; RPN or Action Priority drives mitigation.
PFMEA (Process FMEA)
Same analysis applied to manufacturing process - failure modes, controls, mitigation.
GD&T per ASME Y14.5 + ISO 1101
Geometric Dimensioning + Tolerancing - standardised drawing language for form, orientation, location, runout.
Cpk + Ppk + statistical capability
Cpk = process capability vs spec (short-term); Ppk = process performance (long-term). Cpk 1.33 typical minimum, 1.67 for critical / safety.

Design-to-cost + VAVE + Tier 2 cascade

Design-to-cost (DTC)
Engineering process anchored to a target piece-price from program quote - drives concept selection + BOM + process choice.
Should-cost analysis
First-principles cost estimation - raw material + process + labour + overhead + margin - used in design + Tier 2 negotiation.
VAVE (Value Analysis / Value Engineering)
Systematic post-quote cost reduction - design + process + supplier alternatives while preserving function.
Tier 2 supplier cascade
Tier 1 cascades OEM requirements - quality, APQP, PPAP, IATF, sometimes ISO 26262 + ASPICE - to its own suppliers.

ISO 26262 + ASPICE + IATF for suppliers

ASIL cascade from OEM
OEM allocates ASIL A-D to the supplied item; supplier inherits and must deliver evidence at that ASIL level.
Technical Safety Concept (TSC)
Supplier-authored derivation of technical safety requirements from functional safety requirements - architecture, diagnostic, fault tolerance.
ASPICE capability level
OEMs typically require ASPICE capability level 2 or 3 for software development - audited at program start + during.
DIA (Development Interface Agreement)
ISO 26262 contractual document defining safety responsibilities, deliverables, interfaces between OEM + supplier.

Practical drills

  • An OEM has awarded your team a new component program. SOR specifies functional + dimensional + quality + cost + timing. Walk through your APQP plan, design concept, DV / PV, PPAP path. Identify 2-3 highest-risk gaps in the SOR.
  • DV testing reveals a high-RPN failure mode on a safety-relevant feature. Walk through DFMEA update, design + process response, DV / PV protocol, PPAP impact.
  • OEM has demanded an 8% piece-price reduction by year 2 of production - VAVE program triggered. Current BOM walk: material 55%, process 25%, Tier 2 components 15%, overhead 5%. Walk through your VAVE engineering approach + design alternatives + ECN / re-PPAP plan.

Smart-question anchors

  • Product portfolio + lead OEM customers - awarded programs + SOP roadmap
  • Electrification + ADAS posture - BEV / hybrid + sensor / ECU + SW investment
  • Engineering org + global tech-center model - design vs application vs program
  • Quality + safety + cyber posture - IATF + ISO 26262 + ISO 21434 + ASPICE maturity
  • Cost + commercial posture - margin trend, VAVE programs, piece-price negotiation rhythm

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