Level up your engineering team
In-depth trainings with progress tracking, quizzes, and completion certificates. Assign learning paths to your team and watch them grow.
In-depth trainings
Carefully structured lessons from beginner to advanced, readable in one sitting.
Learning paths
Organizations compose ordered paths and assign them to their teams.
Progress tracking
Section-level progress, quiz scores, and team-wide analytics for admins.
Certificates
Automatic, printable certificates for completed trainings and paths.
Latest trainings
Free, public, and certificate-backed.
React Interview: State Management, Performance & Modern React
The senior round — Context and when it hurts, choosing a state library, diagnosing wasted re-renders with the Profiler, virtualization, error boundaries and Suspense, plus Server Components and what changed in React 18 and 19.
React Machine Coding Round: Build These Six Components
The hands-on round — debounced search with cancellation, a paginated list, an accessible modal, form validation, a stopwatch, and infinite scroll. Full working implementations plus what the interviewer is scoring.
React Interview: Hooks Deep Dive & the Traps
Every hook you will be asked about and every trap that comes with it — batching, stale closures, effect dependencies and cleanup, useRef vs useState, useMemo vs useCallback, custom hooks, and the rules of hooks with the reason behind them.
React Interview: Rendering Model, Keys & Component Design
The theory round done properly — how React actually renders and reconciles, why keys matter, props vs state, controlled vs uncontrolled inputs, lifting state, and the composition patterns interviewers ask you to name.
Java Interview: Concurrency, Memory Model & the JVM
The senior round: threads and executors, synchronized vs volatile vs atomics, the Java Memory Model, deadlock, CompletableFuture, plus JVM memory areas, garbage collection, and how to reason about a memory leak.
Java Interview: OOP, SOLID & Design Patterns
The design round: polymorphism and abstraction explained the way interviewers want to hear it, SOLID applied to real code, the handful of patterns that get asked, immutability, and generics.