DevSkiller's coding tests give you a realistic project to complete rather than a puzzle, graded by hidden tests and code analysis. The company rebranded as SkillPanel in September 2025, so your invitation may use either name. This page covers what the DevSkiller test is, its format and timings, how it is scored, the rules to know before you start, how to prepare and a practice plan.
What the DevSkiller test is
DevSkiller, based in Warsaw, markets its approach as testing real-life coding. Its coding-test pages now live on SkillPanel's site, though many still use the DevSkiller name.
Format and timings
| Part | What it involves | Time and questions |
|---|---|---|
| Project-based programming task | Work in a browser IDE based on VS Code, or clone the project and work in your own IDE | Fixed per test; examples range from about 30 to 195 minutes |
| Visible unit tests | Basic checks you can run | Within the task |
| Hidden verification | Final grading with hidden tests and static code analysis | After time expires |
Total: fixed for each test and shown in the invitation; the test is evaluated automatically when time expires.
How it is scored
- Grading uses hidden verification tests plus static code analysis.
- The report goes to the recruiter when time runs out.
- There is no public cut-off.
Rules to know before you start
- You choose when to start within the invitation window, so block out the full test time.
- The visible unit tests cover only basics.
- If you work locally, push your work before time expires.
How to prepare
- Read the README or getting-started guide first.
- Run the provided tests often, then add edge cases of your own.
- Use your own IDE if you are faster in it, cloning and pushing through git.
- Leave time at the end to clean up code, because static analysis counts.
A practice plan
- Day 1: read the platform's candidate guide and try its practice environment.
- Days 2 to 4: two timed problems a day in your test language, writing your own edge-case tests.
- Day 5: one full mock under the real time limit.
- Day 6: review mistakes and the input and output rules.
- Day 7: take the test in one sitting with a stable connection.
Related guides: what an online assessment is, the HackerRank assessment guide, the CodeSignal assessment guide.
On the day, and the mistakes to avoid
- Check the platform, the allowed languages and the time limit in the invitation.
- Try the practice environment or tutorial so the editor and run buttons are not new.
- Use a reliable computer on a stable connection, with other apps and tabs closed.
- Read every problem before starting, and do the quickest ones first.
- Write and run your own edge-case tests before submitting.
- Keep a few minutes at the end to check output formats and resubmit if needed.
Mistakes that cost candidates:
- Writing an elegant solution that fails large hidden tests because of its complexity.
- Mismatched output formats: extra spaces, prompts or debug prints.
- Spending most of the time on one hard problem while easier points go unclaimed.
- Pasting code you did not write, which integrity settings can flag.
- Not reading the input limits, so a solution that works on samples times out.
What happens after the DevSkiller test
If you pass, the next stage is usually a technical interview, and some interviewers ask about your assessment solution. Be ready to explain your approach and its complexity out loud, and prepare two or three behavioral stories for the conversations that follow. For the next stage, see software engineer behavioral answers.
Where CoPilot Interview fits
Online assessments are tests you take on your own: outside help is not allowed, and proctoring settings can flag other apps, tab switches or a second voice. Practice beforehand instead. CoPilot Interview is an AI interview assistant; its free AI mock interview prepares you for the interviews that follow the assessment, with questions built from your résumé and the job description and each spoken answer scored out of ten. The free plan gives 15 minutes a day of live help in sessions of up to 15 minutes, with AI mock interviews included. Read the invitation carefully and follow your employer's rules.
Disclosure: CoPilot Interview is our product, so weigh what we say about it accordingly.
Frequently asked questions
Is DevSkiller now SkillPanel?
Yes. DevSkiller announced in September 2025 that it is now SkillPanel, and its coding-test pages moved to SkillPanel's site.
Can I use my own IDE?
Yes for many tests: clone the project through git, work locally and push your changes.
How is a DevSkiller test graded?
By hidden verification tests and static code analysis, not just the visible unit tests.
How long is a DevSkiller test?
It depends on the test, from about 30 minutes to over three hours in examples on its skill pages.
Can I use AI tools during the DevSkiller test?
No, unless the instructions explicitly allow it. Assessments are meant to be taken on your own, and proctoring settings can flag other apps, tab switches or pasted code. Use AI tools to practice beforehand, and follow your employer's rules.
Practice this interview before the real one
The AI mock interview builds questions from your resume and the job description, reads them aloud and scores each spoken answer out of 10. Included on the free plan.
Start a mock interview