Kotlin development is becoming increasingly popular, so you can expect to pay a higher price for a Kotlin developer than for one who specializes in another language. However, as with any other service, the cost of a Kotlin developer will vary depending on their qualifications and experience. If you're looking to hire a freelance Kotlin developer, you can expect to pay around $60 - $100 per hour. Rates will be higher if you require an individual with extensive experience and/or expertise in using the Kotlin programming language.