Solo problem practice
Builds algorithm recognition, language fluency, implementation speed, and familiarity with common data structures.
25 live DSA mocks
AI coding mock interviews for DSA practice
Practice LeetCode-style algorithm problems with a voice interviewer, a code editor in nine languages with a Run button, adaptive follow-ups, and interviewer-led validation. EngMock is independent and is not affiliated with or endorsed by LeetCode.
Turn problem practice into interview practice
What a live mock adds to solo coding practice
Live coding mock interview
Adds clarification, thinking aloud, interviewer follow-ups, complexity trade-offs, testing discipline, and feedback on the evidence you produced.
Available now
Solve and explain in a live interview
Choose Python, JavaScript, TypeScript, Java, C++, C#, Go, Rust, or Kotlin. Switching languages keeps each draft intact and sends only the active language to the interviewer.
In Runnable Coding you call your solution from the main method and run it in an isolated sandbox; in Whiteboard Coding (No Run) you validate with inline assertions and a verbal dry run. The interviewer asks for testing when it is missing and adapts follow-ups to your approach.
How the coding workspace and sandbox work, or take the interview in your own VS Code.
Problem decomposition
Clarify inputs, constraints, edge cases, and the target complexity before implementing.
Data structure selection
Explain why a map, heap, tree, graph, queue, or other structure fits the operations you need.
Algorithmic reasoning
Compare approaches, communicate invariants, and make time and space complexity explicit.
Implementation quality
Practice readable code, tests you run or trace by hand, and follow-up optimization.
Choose the coding format
Classic DSA or AI-assisted coding
DSA measures independent problem solving. The separate AI-assisted track measures how you direct, inspect, correct, and take ownership of AI-generated work in a multi-file repository.
Classic DSA
Explain the algorithm, implement it yourself, analyze complexity, and validate cases in the editor or verbally.
AI-assisted coding mode
Use the audited in-product assistant while the interview measures framing, prompting, review, validation, correction, and final accountability.
Both tracks run code in the same sandbox: AI-assisted coding always uses Runnable Coding, and DSA lets you choose Runnable Coding or Whiteboard Coding (No Run). The live interviewer evaluates the code, runs and reasoning you actually produced.
A practical workflow for today
Use the live mock, then broaden your practice
- 1
Start the live scenario
Choose a language and editor mode, clarify the contract, and think aloud while implementing.
- 2
Validate it
Run representative inputs, edge cases and your own tests, or trace them by hand in Whiteboard Coding (No Run).
- 3
Expand with reported questions
Filter candidate-reported DSA prompts by company or difficulty and repeat the same explanation-first workflow.
Try a live DSA mock
Choose from 25 DSA scenarios, then broaden your coverage with the Question Bank.
Coding mock interview FAQ
Practice the skills a real interviewer can observe
- Is EngMock a LeetCode mock interview?
- EngMock uses LeetCode-style data structures and algorithms problems inside a live interview. You explain your reasoning aloud, code in the editor, respond to follow-ups, and validate your solution. EngMock is independent and is not affiliated with or endorsed by LeetCode.
- How is a coding mock interview different from solving problems alone?
- Solo practice builds pattern recognition and implementation speed. A mock interview also tests clarification, communication, trade-off analysis, testing, and how you respond when an interviewer changes a constraint or asks for an optimization.
- Which programming languages can I use?
- The live DSA workspace supports Python, JavaScript, TypeScript, Java, C++, C#, Go, Rust and Kotlin. You pick the language in the editor once the interview starts, and each language keeps an independent draft when you switch.