API and Full Stack Coding Patterns Questions
Beyond pure algorithms, be prepared for problems that combine algorithmic thinking with API design, rate limiting, caching strategies, or distributed system concepts. Understanding how a coding solution fits into a larger fullstack architecture.
MediumTechnical
80 practiced
Implement a POST /bulk-products endpoint that accepts up to 10k product JSON objects. Design a streaming processing approach (Node or Python pseudocode) that processes items in chunks, uses minimal memory, returns a per-item status report, and supports resumable uploads (upload ID + offset). Focus on error isolation and reporting.
MediumTechnical
92 practiced
Implement a reusable JavaScript function fetchWithRetries(url, options, maxRetries = 3) that wraps fetch and retries idempotent requests on transient network failures using exponential backoff with jitter. Explain which HTTP methods you should retry by default and why, and how to handle AbortController timeouts.
HardTechnical
78 practiced
Case study: Your company must integrate with a legacy partner exposing a SOAP API. Design a modern RESTful adapter that internal teams can use: ensure idempotent endpoints, paginated resource access, schema mapping between XML and JSON, retries for flaky SOAP operations, WS-Security handling, and a migration plan to move clients off the adapter later. Provide testing and monitoring strategies.
MediumTechnical
89 practiced
Design a contract-testing strategy between frontend and backend teams. Cover consumer-driven contracts (e.g., Pact), OpenAPI-based contracts, mock servers for frontend development, CI integration (pipeline gates), and how to detect breaking changes early. Explain how to manage flaky tests and versioned contracts.
MediumSystem Design
122 practiced
Design the responsibilities and boundaries of an API Gateway in front of microservices. Cover routing, authentication/authorization, rate limiting, request/response transformations, caching, logging, circuit breaking, and how to implement extensible filters/plugins. Decide what should remain in the services versus in the gateway and justify choices.
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