Technical interview guide

Vendor & Technology Selection Tradeoffs

Evaluating build-vs-buy and vendor options against a customer's actual constraints, not feature checklists.

Read: 38 min
Practice MCQs: 25
Interview QA: 25
Edition: v4
Editorial status: Reviewed
Relevant for: Forward Deployed Engineer (FDE)Solutions Architect

Scope: AWS, Azure, Google Cloud, and NIST technology-selection and supply-chain guidance current 2026-08-31.

Interview QA

Treat each question like a live interview question: answer out loud first (structure, assumptions, tradeoffs), then open the model answer to spot gaps and rehearse a tighter follow-up.

Curated: 2026-10-05 · Written: 2026-10-05 · Reviewed: 2026-10-03

QA-1

Compare build versus buy for a differentiating capability.

QA-2

Evaluate a managed service against a self-hosted alternative.

QA-3

Design a vendor-selection process for a regulated workload.

QA-4

Create a weighted decision matrix without gaming it.

QA-5

Assess vendor lock-in for a proposed data platform.

QA-6

Respond when the cheapest option has the weakest support model.

QA-7

Design a fair benchmark for two candidate technologies.

QA-8

Evaluate a startup vendor for a critical dependency.

QA-9

Handle a vendor roadmap feature required by the target design.

QA-10

Model total cost for usage-based pricing.

QA-11

Review an open-source component against a commercial product.

QA-12

Decide whether to standardize on one platform across teams.

QA-13

Evaluate data residency and sovereignty claims.

QA-14

Handle a preferred vendor that fails a mandatory requirement.

QA-15

Present a technology recommendation to executives and engineers.

QA-16

How do you technically evaluate SLA and business continuity claims like RPO, RTO, and multi-region failover for a mission-critical SaaS dependency?

QA-17

Assess migration cost from the incumbent to a candidate.

QA-18

Evaluate an AI service with rapidly changing models and prices.

QA-19

Resolve conflicting scores from security and product teams.

QA-20

How do you conduct an architectural PoC to stress-test high-throughput limitations and latency claims of a third-party vendor?

QA-21

Assess whether a proposed abstraction meaningfully reduces lock-in.

QA-22

Investigate a vendor claim of unlimited scale.

QA-23

Design ongoing vendor-risk monitoring after selection.

QA-24

Explain why the highest matrix score might not win.

QA-25