The Certified Kotlin Programmer (CKTP) is an intermediate, vendor-neutral certification for developers who program in Kotlin. It validates that you know Kotlin syntax and types, can use null safety and collections, can write control flow and functions, can apply object-oriented and functional style, can work with coroutines and the standard library, and can handle Java interoperability, testing and best practices. The exam is computer adaptive and performance-based, and the credential is kept current through continuing education.
| Level | Intermediate. It assumes some hands-on Kotlin or programming experience and validates programming in Kotlin end to end. |
|---|---|
| Delivery model | Computer adaptive, three stages. Your score on each stage selects the difficulty of the next, so no two candidates sit the same paper. |
| Format | 80 questions. A performance-based exam that includes performance-based questions and multiple-choice questions. Concepts transfer across Android, the JVM and beyond. |
| Time | 120 minutes for the whole exam, timed. Autosaves every answer. |
| Scoring | You need a score of 700 out of 900 to pass. Results are reported on a scale of 100 to 900, and 700 corresponds to answering 72% of the exam correctly. Harder questions carry more weight, so a score means the same thing on any route. Multiple-response items and PBQs are all or nothing. |
| Retakes | No waiting period after a failed first attempt. Every attempt is paid for at the exam price. See the CertLabz Certification Retake Policy. |
| Voucher validity | 12 months from purchase, for one sitting. |
| Certification validity | 3 years. Renew with 50 CEUs per cycle and the $35 annual CE fee, or pass the current exam. Renewal details. |
| Language | English. |
| Credential | PDF certificate with QR code, public verification page, LinkedIn-ready credential ID. Issuer: CertLabz Certification Board. |
| Free resources | The exam objectives PDF and the ten sample questions PDF. |
| Workforce mapping | NICE Framework work roles: Secure Software Development (DD-WRL-003). O*NET occupations: Software Developers (15-1252.00). Self-declared by CertLabz, not reviewed by NIST or CISA. See the full mapping. |
A signed, verifiable:
The CKTP is a performance-based exam: it includes performance-based questions alongside multiple-choice questions. Instead of only picking A, B, C or D, you match constructs to their behavior, order the steps of a task, fix a bug, and choose the idiomatic approach. It is computer adaptive, is proctored and timed, needs no mandatory course, and tests programming in Kotlin rather than reciting syntax.
The language core, val and var, null safety, collections and ranges.
Control flow, the when expression, functions and lambdas, classes and interfaces.
Coroutines, suspend functions, flows, scope functions and the standard library.
Java interop, exceptions, unit testing, sealed classes and code style.
Kotlin is the preferred language for Android and a strong choice on the JVM, and skilled Kotlin developers are in demand. Every route is shown here at once, so nothing is hidden behind a control you have to find.
United States pay reported by Glassdoor, checked September 2026. Pay varies by location, employer and experience. No certification guarantees a salary or a job.
| CertLabz CKTP | JetBrains Kotlin certificate | |
|---|---|---|
| What it is | Certification exam | Certification exam |
| Computer adaptive | Yes | No |
| Hands-on PBQs | Yes | No |
| Scope | Kotlin, vendor neutral | The Kotlin language |
| Vendor neutral | Yes | Yes |
| Proctored | Yes | Yes |
| Questions | 80 | Not published |
| Time | 120 min | Not published |
| Pass mark | 700 of 900 | Not published |
| Course required | No | Course based |
| Exam voucher | $149 | Not published |
Details compiled September 2026; there is no standalone proctored Kotlin exam with a published price, so a course-based certificate is shown for reference, while the CKTP is a computer adaptive, performance-based exam at $149; product names and trademarks belong to their owners; CertLabz is not affiliated; confirm current details with each provider.
Six reasons this credential is worth your time, and worth an employer's attention.
One price for the exam, set by its level. Bundles add the study guide and hands-on practice at a saving.
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Every form is drawn from a bank of more than 90 items to these exact weights, whichever adaptive route you take. Filter by the area you want to study.
The exam runs in three stages. Your score on each stage selects the difficulty of the next, so a strong candidate is stretched and a struggling one is measured fairly rather than swamped. No two candidates sit the same paper. Harder questions carry more weight, so a scaled score means the same thing whichever route you took.
Each exam can have up to 5 to 12 performance-based questions, drawn fresh on every attempt, alongside the multiple-choice questions. A PBQ is a task rather than a list: you match constructs to their behavior, order the steps of a task, fix a bug, or choose the idiomatic approach. They are scored all or nothing, so partial guesses do not pass.
The CKTP is vendor neutral and focuses on modern Kotlin, naming tools only as examples. It tests the judgement that transfers across projects rather than one library's API.
Yes. Where a capability such as a coroutine or a collection function is involved, it is described by what it does, not tied to one product.
700 out of 900. Results are reported on a scale of 100 to 900, and 700 corresponds to answering 72% of the exam correctly.
There is no waiting period between a failed first attempt and a second attempt. Buy another voucher and sit the exam again when you are ready, and it will draw a fresh adaptive form from the bank. See the CertLabz Certification Retake Policy.
Yes, after three years. Keep it current by logging 50 CEUs during the cycle and paying the $35 annual CE fee before expiry, or by passing the current exam again.
The exam objectives PDF and the ten sample questions PDF. The CKTP Official Study Guide is a $50 ebook, included in two of the bundles. Hands-on practice comes with the All Access plan, included in the Complete bundle.
A laptop or desktop with a webcam and microphone, Chrome, Edge or Firefox, a stable connection, and a quiet private room for two hours. Phones and tablets are not supported.
CKTP is a continuing-education certification, like the CE credentials from CompTIA and ISC2. It is valid for three years from the day you pass. To keep it, log 50 continuing-education units during the cycle and pay the $35 annual CE fee before your expiry date. Or pass the current version of the exam again. Earning a higher-level CertLabz certification renews it too, the way CompTIA certifications stack.
CEUs are logged from your CertLabz dashboard with supporting evidence. A certification that lapses can be reinstated only by passing the current exam.
Buy a voucher, study the objectives, sit the exam when you are ready. Your credential is issued the moment you pass.