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 proficiency
35% weight
Check fluency in REST and GraphQL design: OpenAPI/Swagger specs, versioning strategy, OAuth2 and JWT flows, pagination, idempotency keys, and gateway config in Kong, Apigee or AWS API Gateway.
Evidence to listen for
Command of the languages, frameworks, and data tools the role actually uses
Understands correctness, performance, and failure modes, not just syntax
Has opinions on testing and can justify them
Reads and reasons about code they did not write
Five-point scoring guide
1
Poor
Cannot work independently; fundamentals are missing.
2
Needs Improvement
Weak fundamentals; output needs heavy review.
3
Satisfactory
Competent for the role; needs guidance on complex or unfamiliar work.
4
Very Good
Strong practitioner; handles hard problems with little guidance.
5
Excellent
Names concrete spec decisions, explains token refresh and idempotent retries, and shows endpoints they authored end to end.
02
Evaluation factor
Systems and trade-offs
25% weight
Probe how they handled rate limiting, caching headers, backward compatible schema changes, and breaking-change deprecation windows for consumers they did not control.
Evidence to listen for
Reasons about scale, latency, cost, and failure before writing code
Names the trade-off they chose and what they gave up
Understands the data lifecycle end to end
Anticipates what breaks at ten times the volume
Five-point scoring guide
1
Poor
No thinking beyond the immediate task; no awareness of scale or failure.
2
Needs Improvement
Limited architectural awareness; struggles with design decisions.
3
Satisfactory
Works within an existing design; makes sound local decisions.
4
Very Good
Designs for scale and maintainability; articulates trade-offs clearly.
5
Excellent
Weighs consumer impact against internal cleanliness, describes a deprecation timeline they ran, and explains cache and throttle choices with numbers.
03
Evaluation factor
Evidence and rigour
25% weight
Test their evidence habits: contract tests with Pact, Postman or k6 load runs, p95 latency and error-rate SLOs, and how they traced a production 5xx spike.
Evidence to listen for
Validates results rather than trusting output
Knows how their work is measured and what a bad result looks like
Can describe a time their own analysis or model was wrong and how they caught it
Careful about data quality, leakage, and silent failure
Five-point scoring guide
1
Poor
Ships unvalidated work; no notion of how correctness is checked.
2
Needs Improvement
Validates superficially; misses obvious quality or leakage issues.
3
Satisfactory
Reasonable checks in place; rigour drops under time pressure.
4
Very Good
Validates thoroughly; can name a real error they caught in their own work.
5
Excellent
Cites latency and error budgets before and after their changes, and points to contract or load tests that caught a regression.
04
Evaluation factor
Collaboration and communication
15% weight
Assess how they support consumers: developer docs, changelogs, sandbox environments, and handling integration questions from partner or internal client teams.
Evidence to listen for
Explains technical work to non-technical stakeholders
Gives and takes code or peer review constructively
Documents enough that the work survives their absence
Aligns with team process rather than working around it
Five-point scoring guide
1
Poor
Cannot work in a team; resistant to feedback.
2
Needs Improvement
Communication issues create rework; lone-wolf tendencies.
3
Satisfactory
Adequate team member; documentation and review participation are light.
4
Very Good
Communicates well; reliable reviewer and collaborator.
5
Excellent
Describes documentation or a sandbox they built, and gives a case where partner feedback reshaped an endpoint design.
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