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 what they built in production: cycle or ovulation prediction logic, HealthKit and Google Fit menstrual data sync, FHIR resources, wearable BBT or HRV ingestion, consent flows.
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 the stack and health data APIs used, describes prediction or symptom-logging features shipped, and explains their own code contribution precisely.
02
Evaluation factor
Systems and trade-offs
25% weight
Probe trade-offs around on-device versus server-side inference for sensitive cycle data, data minimisation, retention windows, encryption at rest, and where they drew the SaMD regulatory line.
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 privacy, latency and model accuracy openly, citing a real architecture decision on storing or processing reproductive health records.
03
Evaluation factor
Evidence and rigour
25% weight
Assess how they validated prediction accuracy: cohort backtesting against logged periods, MAE on cycle length, irregular or PCOS edge cases, A/B tests, not just app store ratings.
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
Quotes concrete accuracy metrics and describes how irregular cycles or perimenopause users were tested rather than assumed.
04
Evaluation factor
Collaboration and communication
15% weight
Look for work alongside clinicians, midwives or reproductive endocrinologists, plus handling of GDPR special category data with legal, and user research with menstruating testers.
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 translating clinical guidance into product logic and pushing back on a feature for privacy or medical accuracy reasons.
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Score every candidate against the same standard
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