Languages103 min
Top 100 Python Interview Questions and Answers
Prepare with 100 Python interview questions and detailed answers covering core language behavior, internals, async, typing, testing, and examples.
100 detailed answers
173 substantial interview articlesThe interview library
The interview library
built for recall.
Detailed answers from RecallDeck’s curated 1,750+ card catalog—organized into focused question sets, practical study plans, and honest tool comparisons.
- articles
- 173
- question sets
- 80
- tool and study guides
- 72
- hiring analysis
- 21
Start here
The cornerstone guides
Broad enough to orient a study plan, detailed enough to expose what you cannot yet explain.
Languages105 min
Top 100 Go Interview Questions and Answers
Prepare with 100 Go interview questions and detailed answers on slices, interfaces, concurrency, runtime, testing, distributed systems, and reliability.
100 detailed answers
Interview strategy3 min
A 30-Day Software Engineer Interview Study Plan
Follow a practical 30-day software engineering interview plan for coding, system design, fundamentals, behavioral stories, and mocks.
2 quick answers
Tools3 min
The Best Coding Interview Prep Tools for a Complete Practice Loop
Compare the best coding interview prep tools for algorithms, concepts, mock interviews, system design, and durable recall.
2 quick answers
Answer first
Question sets hide the explanation until you choose to open it, so reading becomes retrieval practice.
Go past the short answer
Detailed examples, edge cases, trade-offs, and failure modes give follow-up questions somewhere to go.
One intent per page
Focused clusters keep JavaScript, SQL, system design, ML, QA, mobile, and career topics easy to find.
Browse the library
Find your next interview topic.
Search by technology, interview round, or the specific idea you need to explain.
173 articles · Showing 24 of 173
Languages5 min
Go Nil Interface vs Typed Nil: Why err != nil
Understand why a Go error can hold a nil pointer and still compare unequal to nil. Run the example, inspect the dynamic type, and fix the return path.
Research and analysis
Frontend4 min
JavaScript Event Loop: Predict the Output, Then Explain It
Trace JavaScript tasks, microtasks, promises, and await with runnable interview exercises, exact output, and a queue-by-queue explanation.
Research and analysis
Languages4 min
Python Mutable Default Arguments: The Bug, Fix, and Tests
See why Python reuses a default list across calls. Fix it with None, preserve caller-owned lists, and use dataclass default_factory correctly.
Research and analysis
Backend & systems5 min
SQL LEFT JOIN: WHERE vs ON, Missing Rows, and COUNT
Debug missing rows after a SQL LEFT JOIN. Compare WHERE and ON filters, count zero matches correctly, and find missing records with NOT EXISTS.
Research and analysis
Tools9 min
They Rebuilt 7 Adobe Apps with AI—and Open-Sourced the Rust Code
Meet the ArtCraft team rebuilding Adobe-style apps with AI and Rust. Explore the code, clean-room method, screenshots, licenses and the limits of early alpha.
Research and analysis
Backend & systems4 min
API Idempotency Keys: Safe Retries Under Concurrency
Design API idempotency with a booking example: operation identity, payload checks, concurrent claims, transaction boundaries, and provider contracts.
Research and analysis
Backend & systems4 min
Cursor vs Offset Pagination: Stable Ordering Without False Guarantees
Choose cursor or offset pagination, build a timestamp-and-id cursor, and understand ties, changing data, token validation, and snapshot limits.
Research and analysis
Backend & systems5 min
Docker Compose DNS and Startup Readiness: Fix a Failing API Connection
Debug Docker Compose connections with service DNS, container ports and PostgreSQL health checks. Separate startup readiness from reconnecting after a failure.
Research and analysis
Tools5 min
Git Rebase vs Merge: Compare the History in a Small Repository
Compare Git merge and rebase in a disposable repository. See which commits change, handle conflicts, recover with reflog and understand shared-history limits.
Research and analysis
Backend & systems5 min
Kubernetes CrashLoopBackOff: Find the Cause Before Restarting
Troubleshoot Kubernetes CrashLoopBackOff with previous container logs, termination reasons and events. Work through a slow-start probe failure and verify recovery.
Research and analysis
Testing4 min
Fix Flaky Playwright Tests with Auto-Waiting and Retrying Assertions
Diagnose flaky Playwright tests with a runnable fixture, a waiting decision table, retrying assertions and a focused trace-review exercise.
Research and analysis
Backend & systems4 min
PostgreSQL EXPLAIN ANALYZE: Read Plans and Choose Useful Indexes
Read PostgreSQL plans with a reproducible query: estimates, actual rows, buffers, composite indexes, and a checklist for testing improvements.
Research and analysis
Languages4 min
Python asyncio TaskGroup vs gather: Failure and Cancellation in Practice
Compare TaskGroup and gather with a deterministic Python experiment: sibling cancellation, exception groups, partial results and cleanup ownership.
Research and analysis
Backend & systems5 min
Redis Cache-Aside and Cache Stampede: Design the Miss Path
Build a Redis cache-aside miss path with TTLs, fill coalescing and bounded fallback. Understand lock ownership, stale refill races and consistency tradeoffs.
Research and analysis
Languages5 min
TypeScript satisfies vs as vs Type Annotations: A Practical Comparison
Compare satisfies, type annotations and assertions with a checked route map, compiler-error examples, const assertions and runtime validation of unknown input.
Research and analysis
Data & AI6 min
AI Agents Explained: Workflows, Tools, and Reliable Results
Learn how AI agents differ from fixed workflows, follow a support-agent example, and design tool permissions, stopping rules, and useful evaluations.
Research and analysis
Data & AI6 min
RAG vs Fine-Tuning: Choose the Fix Your LLM Actually Needs
Compare RAG and fine-tuning through a support-assistant example. Diagnose knowledge, retrieval, and behavior failures before choosing an architecture.
Research and analysis
Frontend8 min
React useEffect Infinite Loops: Diagnose the Cause and Fix the Data Flow
Debug React useEffect loops with working examples: remove derived state, fix unstable dependencies, separate event handlers, and guard asynchronous responses.
Research and analysis
Data & AI8 min
SQL Window Functions Practice: Four Worked PostgreSQL Problems
Practice SQL window functions on eight orders: deterministic rankings, running totals, LAG and moving averages, with PostgreSQL queries and expected answers.
Research and analysis
Tools7 min
What Is MCP? Servers, Tools and APIs Explained
Understand Model Context Protocol through an order-support example: hosts, servers, tools, API integration, permissions and a practical testing checklist.
Research and analysis
Tools6 min
5 AI Skills for Better UI Design: Choose by the Problem
A practical guide to Impeccable, Emil Kowalski’s UI skills, Motion Design, UI/UX Pro Max and Vercel’s guidelines, with example requests and a reusable polish prompt.
4 quick answers
Interview strategy7 min
Is LeetCode Dead? What Google’s AI Interview Reports Mean
A source-checked analysis of Google AI interview claims on Reddit: what is verified, what remains uncertain, and how to prepare beyond algorithm drills.
Research and analysis
Tools5 min
Steal Better Problems: 8 Engineering Blogs Worth Bookmarking
Eight engineering blogs that reveal how real teams design APIs, scale infrastructure, review code, recover from failure, and make production trade-offs.
4 quick answers
Interview strategy3 min
A 30-Day Software Engineer Interview Study Plan
Follow a practical 30-day software engineering interview plan for coding, system design, fundamentals, behavioral stories, and mocks.
2 quick answers
How topics were prioritized
The library stays inside RecallDeck’s interview-preparation expertise. Topic priority combines recurring interview intent, depth in the curated deck, active job-role coverage, and current ecosystem signals—not an invented claim of exact keyword volume.
Editorial guardrail: the pages are designed to leave a candidate with a usable answer or practice step. We do not publish empty location variants, synonym pages, or automatically paraphrased copies.