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 original LeetCode-style algorithm problems with a voice interviewer, Monaco editor, nine language choices, 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.
Validate in the same editor with a main method, inline assertions, comments, or a verbal dry run. The interviewer asks for testing when it is missing and adapts follow-ups to your approach.
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, handwritten validation, test strategy, and follow-up optimization.
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
Handwrite validation
Record representative inputs, expected outputs, edge cases, and manual traces without relying on execution.
- 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 original 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. Each language keeps an independent draft when you switch.