Definition
Coding challenge — A coding challenge is a specific programming problem used to test a candidate's technical skill. Unlike a broader technical interview, which can include conceptual and systems questions, a coding challenge is specifically about writing code to solve a defined problem, whether that's an algorithm, a bug fix, or a small feature build.
Coding challenges appear at nearly every stage of technical hiring: as an early automated filter, the centerpiece of a live round, or a take-home project. Grading varies by format. Automated challenges run a candidate's code against test cases, some visible and some hidden; live challenges are graded by the interviewer watching the process, including how a candidate handles a missed edge case.
The Intervieux angle
Intervieux's technical AI interview runs real coding, debugging, SQL, and written challenges with actual code execution across languages like JavaScript, Python, and Java, using hidden and visible test cases, so practice runs against the same kind of objective grading a real coding challenge uses.
Frequently asked questions
Are coding challenges the same as algorithm puzzles?
Algorithm puzzles are one common type, but the category is broader. Debugging exercises, SQL queries, and small feature builds all count as coding challenges even when they're not classic algorithmic problems.
How are coding challenges graded?
Automated ones run submitted code against test cases, some visible and some hidden until submission, checking correctness and edge cases. Live coding challenges are usually graded by the interviewer based on both the solution and the process.
Do coding challenges test speed or correctness?
Both, depending on format. A timed automated challenge weighs whether the solution passes test cases within a limit; a live challenge with an interviewer weighs the reasoning process as heavily as the result.
Related pages
Run a real coding challenge
Intervieux's technical AI interview executes your actual code against real test cases, not a static quiz.