What makes it feel like a real interview
Solving a problem alone tells you whether your code passes. It does not tell you whether you can carry a conversation while you write it. CodeSparring's AI interviewer follows what you do as you work: it asks why you chose an approach, what happens at the edges, and whether a faster solution exists. Talk it through out loud or type it.
You can try a session without an account: open the workspace, write a solution, and run the tests, with no email and no card. The interviewer itself needs a free account, one click with Google or GitHub. The free AI coding interview page sets out exactly where that line falls, how many sessions the free plan carries, and when the allowance resets.
170+ scenarios across 18 patterns
DSA interviews draw on a smaller set of patterns than any problem count suggests. CodeSparring's scenarios are organized around 18 of them:
- Arrays and hashing, two pointers, and sliding window.
- Stacks, binary search, and linked lists.
- Trees, tries, heaps, and backtracking.
- Graphs, advanced graphs, and dynamic programming.
- Greedy, intervals, math and geometry, and bit manipulation.
If a language, not the pattern, is what slows you down, the free Python course covers the fundamentals these problems lean on, with graded exercises that run in the browser.
What you get back
- A scored rubric covering communication, problem solving, and code quality, not just whether the tests pass.
- Session history and per-pattern progress, so you can see where to practice next.
- On Pro, spaced repetition scheduling and a personalized roadmap that resurfaces the patterns you struggled with.
DSA is one round. CodeSparring also runs bug-fix and case lab rounds set in real codebases, and system design drills, for practice past algorithms. Browse graded sample sessions to see what feedback looks like.