TypeScript adds a structural type system on top of JavaScript. Most of the difficulty sits in what the compiler infers, not in what you wrote.
125 easy · 219 medium · 262 hard
Browse questions →MCQ test MongoDB is a document database. Its interviews are about data modelling and index design far more than about query syntax.
99 easy · 246 medium · 244 hard
Browse questions →MCQ test SQL is the query language every relational database speaks. Interviews test whether you can reason about set semantics, not just write SELECTs.
105 easy · 236 medium · 246 hard
Browse questions →MCQ test JavaScript runs in every browser and, through Node, on most back ends too. It is the language with the widest reach and the most edge cases.
110 easy · 221 medium · 249 hard
Browse questions →MCQ test C# is the .NET language for services, desktop apps and games. Its interviews go deep on value versus reference semantics.
76 easy · 258 medium · 246 hard
Browse questions →MCQ test Go is built for concurrent network services. The runtime is small enough that interviews expect you to know how it behaves.
89 easy · 244 medium · 243 hard
Browse questions →MCQ test HTML is the document layer of the web. Getting it right is most of accessibility and a surprising amount of SEO.
124 easy · 225 medium · 225 hard
Browse questions →MCQ test Python is the default language for scripting, data work, and back-end services that value readability over raw speed.
115 easy · 211 medium · 244 hard
Browse questions →MCQ test Rust enforces memory safety at compile time. Interviews mostly test whether the borrow checker's model is in your head.
75 easy · 241 medium · 250 hard
Browse questions →MCQ test Ruby is a dynamic, deeply reflective language best known through Rails. Its metaprogramming is both the draw and the trap.
50 easy · 247 medium · 260 hard
Browse questions →MCQ test Swift is Apple's language for iOS and macOS. Reference-counting behaviour and value semantics drive most of its gotchas.
60 easy · 245 medium · 244 hard
Browse questions →MCQ test Java runs a very large share of enterprise back ends. Its interviews reward knowing the memory model as well as the syntax.
112 easy · 211 medium · 218 hard
Browse questions →MCQ test React is the dominant way to build user interfaces on the web. The hard parts are re-render timing, identity, and effect cleanup.
120 easy · 218 medium · 198 hard
Browse questions →MCQ test CSS decides layout and paint. Most bugs come from the cascade, stacking contexts, and containing blocks rather than from the properties themselves.
128 easy · 198 medium · 201 hard
Browse questions →MCQ test C++ gives direct control over memory and object lifetime. Almost every interview question is really a lifetime question.
82 easy · 235 medium · 206 hard
Browse questions →MCQ test Node puts JavaScript on the server with a single-threaded event loop and a large streaming and process API surface.
103 easy · 216 medium · 200 hard
Browse questions →MCQ test Kotlin is the default language for Android and a common Java replacement on the JVM. Coroutines are its defining feature.
63 easy · 218 medium · 224 hard
Browse questions →MCQ test 
