USE CASE

Designing as an interviewer

These are the same questions found in the library, grouped here by the capability each one mainly examines.

994 questions

Questions 51–100 of 994 on this page.

A · Professional problem solving and implementation50

After independently developed apps are integrated, styles collide, themes differ, and overlays are clipped. How would you choose a style-isolation strategy?Engineering systems
Several frontend modules build independently, but releases still require coordination. What evidence would show they have a real independent delivery boundary?Engineering systems
A large frontend makes parallel delivery difficult, but splitting it into several apps at once is risky. How would you plan an incremental migration and judge each step?Engineering systems
If a micro-app fails at startup, users cannot access other modules. How would you isolate the failure and, if needed, disable noncritical features to keep the rest available?Engineering systems
Several child apps depend on different React and component-library versions, causing both duplicate downloads and runtime conflicts. How would you govern shared dependencies?Engineering systems
Several child apps share the browser address bar, but back/forward, deep links, and login redirects behave inconsistently. How would you define a routing contract?Engineering systems
Two services write directly to the same business table, and an immediate shutdown is impossible. How would you gradually establish a single data owner?System design
An order is updated successfully, but a cross-service report reflects it minutes later. The product asks for “real-time status.” How would you define and implement consistency expectations?System design
A cross-service flow includes payment, inventory reservation, and shipment. How would you define compensations and irreversible boundaries when later steps fail?System design
Incidents recur at service boundaries. Each team can show its service is healthy, but nobody owns end-to-end recovery. How would you repair accountability?System design
Several services have separate owning teams, yet a small change often requires three or four teams to release together. How would you assess whether the service boundaries have failed?System design
A new feature adds startup dependencies and cold start becomes much slower on low-end devices, while high-end metrics remain normal. How would you prioritize optimization?System design
A user edits offline and queues several changes. When connectivity returns, the token has expired and some requests may already have reached the server. How would you design reauthentication, idempotency, and conflict handling?System design
After code changes, the build system sometimes misses affected apps and sometimes rebuilds the entire repository. How would you validate the dependency graph and cache invalidation rules?Engineering systems
One repository contains multiple teams and production deployment config, but code-owner rules do not cover temporary admins and automation accounts. How would you review permission and approval boundaries?Engineering systems
Two product packages form a dependency cycle, and splitting them creates a need to share domain types. How would you change the boundaries without hiding the cycle in a new shared package?Engineering systems
A team decides to split a large repository, but history, CI, package releases, and ownership are connected. How would you sequence the migration?Engineering systems
In a monorepo, shared packages are casually changed by one team, while consumers discover behavior changes only after upgrading. How would you establish ownership and compatibility contracts?Engineering systems
Packages have very different release cadences, but shared version numbers force unrelated teams to release together. How would you design versioning and release policy?Engineering systems
The repository has hundreds of packages and full CI is slow. The team wants to test only “affected” areas. How would you prove selective testing does not miss critical dependencies?Engineering systems
After an async task starts, the caller immediately mutates an input object, and results sometimes change. How would you determine whether this is shared mutable state, copy semantics, or an ownership issue?Computer-science foundations
Two usernames that look identical are treated as different, or distinct spellings are treated as the same. How would you analyze Unicode normalization and identity comparison?Computer-science foundations
A core flow passes mouse testing, but keyboard or screen-reader users cannot complete it. How would you include accessibility in release gates?Quality, security, and safety
A critical user journey across several pages and services regresses often. How would you define the scope and priority of automated tests?Quality, security, and safety
A user requests deletion of personal data, but some records have reached backups, analytics warehouses, and downstream systems. How would you design a verifiable deletion process?Quality, security, and safety
A widely used dependency is disclosed as critically vulnerable, but upgrading may introduce compatibility issues. How would you sequence the response?Quality, security, and safety
Service failures have exceeded the target range, but the business has firm feature commitments. How would you adjust the release pace and investment in reliability?Quality, security, and safety
Backups report success, but the team has never verified restored data integrity or recovery time. How would you establish demonstrable recovery capability?Quality, security, and safety
A new external service will access user data and trigger internal actions. How would you perform a lightweight but effective threat model?Quality, security, and safety
The system uses pre-signed URLs for private downloads, but links can be forwarded or retained for a long time. How would you design authorization and expiry boundaries?System design
How should the permission system of a large operations back office be designed? How do you organize roles, data scope, approvals, and audit, and how do you keep it from getting out of control as permissions multiply?System design
How would you design an article editing and publishing system? How should state and data be organized for drafts, review, scheduled publishing, multi-channel distribution, and edits after publication?System design
Issuing a coupon after payment used to run synchronously, and it is being changed to an async queue with retries. Review this change: which failure sequences worry you most, and what would you rehearse before release?System design
From a file or the network to picture and sound playing, what stages does a video go through? How do decoding, audio-video sync, stutter, and hardware acceleration each affect the experience?Computer-science foundations
How would you design an online audio or video editor? How should the timeline, assets, non-destructive editing, preview, and final export each be designed?System design
How would you design a platform where operations staff build campaigns and game mechanics themselves? How do you abstract campaigns, mechanics, rules, and features into configurable parts, and how do you keep a configuration correct once it goes live?System design
Before drawing any architecture diagram, which few numbers would you use to decide whether a service should be split or cached? Use a service you know to explain.System design
How would you design a document system for real-time multi-user editing? When several people edit the same passage at once, how do you guarantee eventual consistency, and how do you merge after offline edits?System design
When the business operates across several countries and regions and user data must flow across borders, how do you solve data compliance in systems and processes, and how do you judge and decide in gray areas where the rules are unclear?System design
The local database has updated, but syncing the cache or sending a downstream message fails. How would you make the systems converge and handle retries, compensation, or manual recovery?System design
A major promotion or international launch may increase traffic fivefold next year. Starting from the current architecture, how would you check for bottlenecks in the gateway, critical request flows, storage, and machine resources? How would you phase the work, staff it, and validate your assumptions?System design
How would you design a product where a person and an AI write together? How are the AI's edits shown, accepted, or rejected, and how are conflicts handled when both edit at once?System design
How would you design an immersive audio and video feed so that swiping up and down has almost no waiting? How do you balance preloading, player reuse, memory, and data?System design
How would you design a large-model chat system? How do you handle streamed output, multi-turn context, history, interruption, and retries, and how do you control cost and latency?System design
How would you design an invitation-based viral marketing campaign? How do you design invitation relationships, reward payout, abuse prevention, and effect evaluation?System design
To build an online editor like Doc, PPT, or PS, how do you design the core data model and rendering? How do you handle undo and redo, selection, and performance on large files?System design
How would you design a real-time risk control system? How do rules, features, models, and manual review work together, and how do you trade false blocks against misses?System design
How would you design a search system? How do indexing, retrieval, and ranking divide the work, how are Chinese segmentation and features built, and how do you judge how good the search is?System design
How should the loading and request strategy of streaming media be designed so it starts fast and does not stall? How do you trade off segmenting, adaptive bitrate, preloading, and caching?System design
Tell me about a project you worked on. Why did you choose that technical approach over the others, how was the decision made, and what were its pros and cons?System design