All tracks
498 questions across 27 tracks. A dot marks a track containing a signal round.
Languages
Python
Data model, memory, concurrency, and the runtime behaviour behind production bugs.
6 sets · 55 questions JSJavaScript
Event loop, closures, async semantics, and code that looks right.
5 sets · 48 questions GOGo
Goroutines, channels, context, interfaces, and the concurrency bugs Go makes easy.
1 sets · 10 questions TSTypeScript
Structural typing, generics, narrowing, and where the type system lies to you.
1 sets · 10 questionsBackend
Backend
APIs, idempotency, caching, queues, and designing for the retry.
5 sets · 40 questions DJDjango
Request cycle, middleware, auth, and the settings that cause incidents.
1 sets · 11 questions ORDjango ORM
Querysets, N+1, transactions, and migrations that lock your table.
1 sets · 10 questions FAFastAPI
ASGI, Pydantic, dependency injection, async correctness.
1 sets · 11 questions FLFlask
App and request context, factories, blueprints, WSGI.
1 sets · 10 questions NDNode.js
Event loop phases, streams, cluster vs worker threads, and Express in production.
1 sets · 11 questions GQGraphQL
Schema design, the N+1 resolver, query cost, caching, and when REST is better.
1 sets · 10 questions CECelery & Beat
Acks, retries, idempotency, scheduling, and the duplicate task.
1 sets · 10 questionsData
Frontend
Frontend
HTTP, caching, Core Web Vitals, and making a page measurably fast.
2 sets · 19 questions CSCSS & layout
Specificity, stacking contexts, grid vs flex, container queries, and modern CSS.
1 sets · 10 questions REReact
Reconciliation, hooks, context cost, concurrent rendering, RSC.
3 sets · 27 questions NXNext.js
App Router, server components, four caching layers, server actions.
1 sets · 10 questionsSystems
System Design
Scale, consistency, storage choice, and worked case studies.
4 sets · 29 questions ALDSA
The fifteen patterns, complexity, and how to run the coding round.
2 sets · 24 questions DODevOps & Cloud
Docker, CI/CD, Linux triage, Kubernetes, observability.
3 sets · 23 questions TETesting
What to test where, mocking without lying, killing flaky tests.
1 sets · 10 questions SESecurity
OWASP in practice, auth design, tokens, secrets, SSRF.
1 sets · 10 questionsAI
Craft
Git & workflow
Rebase vs merge, bisect, reflog, conflict recovery, and review hygiene.
1 sets · 10 questions FSFull-stack
End-to-end features, real-time, take-homes, unfamiliar codebases.
1 sets · 9 questions CABehavioral & Career
STAR stories, staff-level signal, negotiation, the offer.
2 sets · 18 questions