Q181. How does the Dependency Inversion Principle change a design?
The Dependency Inversion Principle has two parts: high-level policy should not depend on low-level detail, and abstractions should not depend on details; details should d...
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Q182. What is attribution modelling and why is it hard?
Attribution assigns credit for a conversion to the marketing touchpoints along the customer journey. The model choice changes how budget is allocated. Common models: - La...
Q183. Explain slowly changing dimensions and SCD Type 2.
Dimensions change over time: a customer moves city, a product changes category. A slowly changing dimension strategy decides how history is preserved. - Type 1: overwrite...
Q184. What are pipelining and transactions in Redis?
Pipelining sends many commands in one network round trip without waiting for each reply, dramatically improving throughput for batch workloads since cost is dominated by ...
Q185. When should you prefer the aggregation framework over find?
Use find for simple filtering, projection, sorting and pagination on a single collection. It is lightweight and uses indexes efficiently. Use aggregate when you must tran...
Q186. What makes a message consumer idempotent?
At-least-once delivery means duplicates will happen, so a consumer must produce the same result whether it sees a message once or several times. Techniques: - Deduplicati...
Q187. What is GraphQL federation and when do you need it?
Federation lets several teams own separate GraphQL subgraphs and compose them into one graph for clients. Each subgraph declares the entities it owns with a key directive...
Q188. What causes hydration mismatches and how do you fix them?
Hydration is React attaching event handlers to server-rendered HTML. A mismatch happens when the server HTML differs from the client's first render, and React warns and r...
Q189. How does zone.js drive change detection and what changes with zoneless Angular?
Historically Angular relied on zone.js, which monkey-patches async APIs such as setTimeout, promises, XHR and event listeners so the framework knows when something might ...
Q190. How do you optimise the performance of a large Vue application?
Practical Vue 3 optimisations: use computed instead of methods in templates so results are cached, and split large components. Prefer shallowRef or shallowReactive for la...