Pick an exam to see its syllabus, take a free diagnostic, and practise with explanations for every option.
Timed, blueprint-accurate mocks for the Claude developer certification.
Blueprint-accurate mocks for the Claude Certified Associate – Foundations.
Blueprint-accurate mocks for the Claude Certified Architect – Foundations.
Blueprint-accurate mocks for the Claude Certified Architect – Professional.
The JavaScript questions interviewers actually ask, from types to the event loop.
Reason about scale, consistency and failure the way senior engineers do.
The JavaScript that interviews really probe, from coercion to the event loop and V8.
From narrowing and generics to conditional types and tsconfig, the TypeScript interviews really test.
Render order, stale closures, effects and Server Components: the React that senior interviews dig into.
The event loop, streams, modules and production Node.js that backend interviews dig into.
Mutability, closures, the data model and asyncio: the Python that interviews really probe.
App Router, caching, Server Actions and Proxy: the Next.js 16 that interviews really dig into.
Images, layers, networking and production containers: the Docker that DevOps interviews really test.
Joins, NULLs, window functions and query plans: the SQL that data and backend interviews really test.
Pods, Services, scheduling and rollouts: the Kubernetes that platform and DevOps interviews really test.
Branching, rebasing, undoing mistakes and GitHub workflows: the Git that every engineering interview touches.
Complexity, core structures, graphs and DP: the DSA that coding interviews really test.
Races, memory models, deadlocks, lock-free code and parallel processing: the concurrency senior engineers get grilled on.