How does A/B testing native mobile apps differ from web?
WHAT IT TESTS: Native mobile constraints versus web deployment. A strong answer covers: app store cycles forcing remote flags; device fragmentation skewing segments; and offline usage delaying events. RED FLAG: Assuming mobile mirrors web with instant updates.
Propose a strategy to migrate fragmented docs into a unified docs-as-code system
WHAT IT TESTS: Phased migration from fragmented docs to a unified Git workflow. ANSWER OUTLINE: Inventory sources; choose SSG by team fit; automate extraction; phased rollout with redirects. RED FLAG: Big-bang cutover without audit, buy-in, or rollback.
Propose two strategies for lazy-loading SPA localization data
This tests code-splitting for i18n. Strong answers cover: first, per-locale dynamic imports creating separate chunks per language; second, namespace splitting fetching only keys for active UI. Red flag: ignoring bundler chunking or Core Web Vitals impact.
How would you implement a simple editorial status workflow?
WHAT IT TESTS: Database state machine design. ANSWER OUTLINE: Use ENUM or lookup table for status; enforce transitions in app code or a matrix table; audit actor and timestamp.
What are the engineering challenges and biases in overlapping A/B tests?
This tests inference across concurrent experiments. A strong answer names interaction effects and collision bias, proposes mutual exclusion or MVT for coupled UI, and stratified bucketing. Red flag: assuming additive lifts without combination validation.
Cut a 15-minute demo script to 10 minutes without losing technical depth
Tests ruthless prioritization. Strong answers: define the single audience outcome; audit sections against it; prioritize clarity over volume; structure around the 10-minute attention reset. Red flag: talking faster or randomly cutting content.
Design an A/B test system for homepage headlines without deployments
Tests decoupling experiment configuration from deploys via a headless CMS and feature flagging. A strong answer covers variation containers, server-side bucketing, conversion tracking, and marketer-controlled copy swaps.
Refactor this to active voice and explain why it is preferred
This tests spotting passive clauses and why active voice improves clarity. Answer: rewrite to "The script processes the data and sends it to the database," noting active voice is clearer and names the actor. Red flag: claiming passive is more professional.
Draft a JSON error response for an invalid authentication token
Tests your ability to standardize API error contracts with RFC 7807. A strong answer returns 401 with type, title, detail, and instance, plus an actionable fix like re-authenticating. Red flag: 403, echoing the token, or exposing stack traces.
Design a system to measure technical content deflection
Tests causal attribution of content on tickets. Answers must unify identity, correlate topics with NLP, compute deflection as self-service resolutions over total intent, and validate outcomes.
How would you structure API docs and tools for reference and narrative?
Tests if you separate auto-generated reference from narrative guides. Strong answers pair OpenAPI/Swagger endpoints with hand-written getting-started tutorials and conceptual overviews in a docs-as-code static site.
What metrics prove documentation business impact and how do you instrument?
Tests tying docs to revenue and costs. Strong answers present acquisition (dev signups, quickstart rate), adoption (endpoint breadth, trial conversion), and deflection (support tickets) via event instrumentation and CRM joins.
Design a scalable documentation system for three engineering teams
Tests prioritization and process design for a sole writer supporting three engineering teams. Strong answers use tiered intake with SLAs, a public Kanban board, and async status updates. Red flag: ad-hoc prioritization through Slack DMs with no queue.
How do you consolidate scattered feedback and track document revisions?
WHAT IT TESTS: Your ability to turn chaos into a structured approval workflow. A strong answer covers triage into one source of truth, owner assignment per revision, and tracking tools. Red flag: manual consolidation without version control or deadlines.
Display a dynamic uptime claim without hurting Core Web Vitals
Tests separation of data and rendering paths for dynamic claims. Pre-compute the metric in a background job, cache at the edge, and inject via SSR to avoid blocking the main thread. A red flag is synchronous DB lookups or CSR that delays interactivity.
Accessibility pitfalls in SPAs and programmatic fixes
WHAT IT TESTS: SPAs lose native page-load cues, breaking screen reader context. ANSWER OUTLINE: Cover route-change focus reset, ARIA live regions, semantic landmarks in dynamic markup, and keyboard trap prevention.
Describe the technical steps for displaying and enforcing a cookie consent banner.
Tests privacy-first frontend architecture. Outline: check consent record, render banner if absent, classify scripts as essential or non-essential, persist choice, and inject tracking only after explicit opt-in.
What HTML attributes and elements make a banner accessible to screen readers?
This tests semantic HTML for decorative and informative images. A strong answer names img alt, heading levels, and a landmark region such as aside with aria-label. A red flag is relying on CSS or divs without text alternatives.
Design a real-time top-10 dashboard for a global news site
WHAT IT TESTS: separating hot-path reads from cold-path analytics at scale. A GOOD ANSWER COVERS: stream ingestion, windowed aggregation, Redis top-N cache, and TTL eviction. RED FLAG: scanning raw events or running global SQL GROUP BY per request.
Design anonymous-to-authenticated user journey stitching for ROI
Tests identity resolution and privacy-compliant attribution. Strong answers cover first-party UUID stitching, consent-gated probabilistic matching, async CDP merge, and TTL deletion. Red flag: treating anonymous IDs as non-personal data or skipping consent.