Hire the best Kotlin developers

Check out Kotlin developers with the skills you need for your next job.

Clients rate Kotlin developers
Rating is 4.8 out of 5.
4.8/5
based on 7,380 client reviews
Oleksandr K.
$25/hr
  • Trophy Icon Kotlin
  • Java
  • Git
  • CSS
  • SQL
  • GPS
  • Android App Development
  • Google Maps API
  • Android
  • Android SDK

I have a passion for taking the web and making it mobile. Over last 7 years I got mobile development experience in a broad range of industries, including social gaming, education, sports entertainment, dating, restaurant management and rental solutions. I have solid understanding of full mobile and software development life cycles, UIX, web analytics, changing web standards, and Agile methodologies. Dedicated to continuously developing, implementing, and adopting new technologies to maximize development efficiency and produce innovative applications.

Ernis A.
$50/hr
  • Trophy Icon Kotlin
  • Swift
  • Java
  • Firebase
  • Native App Development
  • Push Notifications
  • User Authentication
  • Android App Development
  • SQLite
  • Android SDK
  • Google Analytics
  • Agora.io
  • Auth0
  • Shopify Apps

I have been working professionally as a Software Engineer for over 10 years now. In this journey, I have worked on 50+ projects on various technologies and gained huge experience in Mobile App development. Furthermore, being a CTO in IT companies over the last 3 years, took part and released several huge projects from the idea to launch. I gained experience and improved my skills in Project and Team Management. My professional goal is to make on-demand and highly-rated projects. I have enough experience and can work hard to achieve it. [Technical Skills] - Android mobile app (Java, Kotlin); - iOS (Swift); - backend (Python, PHP, C#); - DB...

Vivek C.
$50/hr
  • Trophy Icon Kotlin
  • Mobile App Development
  • Android App Development
  • Android
  • Java
  • iOS
  • Swift
  • Flutter
  • Android Studio
  • Apple Xcode
  • Socket.io
  • API
  • API Integration
  • Laravel
  • iOS Development

⭐️ Top Rated Plus (Top 3%) Upwork Freelancer ⭐️ 5+ Years in Mobile App Development ⭐️ 30+ Successfully Completed Projects ⭐️ 100% Job Success Ratio Hello! I have the skill to develop an online presence for your business. I am a mobile application developer with 5+ years of hands-on experience in mobile development and web development. Why to hire me among thousands of other freelancers? Offering an unparalleled level of quality of work and professionalism comes in the first place. Building trust bridges with clients and effective communication comes on top of my skill set. As a developer, I strive to keep up-to-date with the latest techs...

Dmytro S.
$75/hr
  • Trophy Icon Kotlin
  • Java
  • Android SDK
  • Clean Architecture
  • solidThinking Envision
  • Android App Development
  • Material Design
  • Multithreaded Programming
  • Agile Software Development
  • Firebase
  • Android Room Persistence
  • Dagger 2
  • RxJava
  • Model View ViewModel
  • Model View Presenter

💻 I've been creating software for Android OS since 2017. 🚀 Developed over 30+ projects for millions of users. 🌎 Have experience with international teams and customers from Great Britain, the Republic of Zimbabwe, the USA, Russia, Ukraine, Romania and others. Can help you: 🔹Create an Android application from scratch 🔹Optimise your existing android application 🔹Choose the most reliable and convenient technology stack and architecture for your application 🔹Provide quality estimation of a task 🔹Find and resolve issues of your android application and implement new features 🔹Interview candidates on Android developer position into your...

Artem I.
$60/hr
  • Trophy Icon Kotlin
  • REST
  • Java
  • Android SDK
  • Material Design
  • Websockets
  • Firebase
  • Android App Development
  • Mobile UI Design
  • Google Maps API
  • Android NDK
  • SQLite
  • GraphQL
  • Mobile App Development
  • In-App Purchases

Fundamentals: Experienced Android Developer 20+ released projects 7+ years of Android development experience English: Fluent I've been developing high-quality mobile apps for more than 7 years now. I've been working on a broad variety of projects: mobile banking apps, mobile clients for enterprise systems, educational and entertaining apps, b2b and b2c projects. I've worked with applications requiring different technologies and skills. I especially want to note the experience of fixing errors made by previous developers.

Jorge G.
$100/hr
  • Trophy Icon Kotlin
  • Android
  • Java
  • Mobile
  • Testing
  • Bluetooth
  • In-App Purchases
  • Firebase
  • Core Bluetooth

I'm a native Android developer with six years of experience working on a wide range of Android projects with multiple clients. 2019 Google Play Award nominee for best app in the "Standout Well-Being App" category. I'm currently a Software Engineer at Google. I do freelance Android apps for small and medium-sized businesses looking to enter the mobile market looking to make their new product or service a reality. I've worked with startups, freelancers, and more prominent companies developing high-quality, thoroughly tested applications that perform fast and smooth across a wide range of Android phones and tablets. Skills and technologies...

Yevhenii B.
$35/hr
  • Trophy Icon Kotlin
  • Android App Development
  • JSON
  • Java
  • SQL
  • Git
  • Gradle
  • Android
  • Android SDK
  • Native App Development
  • Firebase
  • Android Room Persistence
  • Retrofit
  • Model View ViewModel
  • Tablet

Android Developer from Ukraine (UTC+2), with 8+ years of experience in designing and implementing Android applications. Deep expertise in Kotlin and Java for Android and Material Design Guidelines, skilled in mobile UI development, experienced with version controls such as Git, have great analytical and problem-solving skills. Android Jetpack; AndroidX; MVVM; MVP; MVI; MVC; Android Jetpack; AndroidX; MVVM; MVP; MVI; MVC; Company HR - please do not disturb.

Oluwatosin A.
$35/hr
  • Trophy Icon Kotlin
  • Android App Development
  • Java
  • Vue.js
  • Dagger 2
  • RxJava
  • Android Room Persistence
  • Geolocation
  • Laravel
  • JUnit

Incisive software engineer with a demonstrated pedigree at developing bespoke web and mobile applications that drive business efficiencies. Main focus with Java and Kotlin with experience in backend, android and front-end engineering. I have a big focus on functionality, clean code, testability and efficiency at every level of my development cycle. Also interested in architecture patterns, mathematics and algorithms. My Core Skills Include: Kotlin, Java, Android SDK, SpringBoot, Spring Cloud, Spring MVC, Ktor Server, MVP, MVVM and Clean Architecture Patterns, Dagger, Koin, and Guice, RxJava, Coroutines, Espresso, Mockito, JUnit, Exposed,...

Khurram S.
$25/hr
  • Trophy Icon Kotlin
  • Java
  • Spring Boot
  • Vue.js
  • React
  • Azure
  • AWS Amplify
  • Adobe Flex
  • PostgreSQL
  • Vuetify

Full Stack Developer, working in the software industry for the last 17+ years. It started from classic ASP, .NET, FLEX, Java, and recently React, Vue js, Kotlin, AWS, Azure Integrations. ✔ Recent Work I am currently working with Koerber Digital as a Full Stack Developer on their obsolescence management product for the last 1.5 years. Product development: I built multiple web pages that include basic controls to the relatively complex table and chart object using charts and based on UI/UX defined Figma-based designs. On the back-end, developed new REST APIs, implemented database access layer with Kotlin/Exposed, Interfacing with AWS...

Neha J.
$20/hr
  • Trophy Icon Kotlin
  • Mobile App Development
  • Android App Development
  • Android Studio
  • Android SDK
  • Java
  • API Integration
  • Android Room Persistence
  • Reactive Programming
  • JavaScript
  • Location-Based Service
  • Android
  • Smartphone

#Android #Dev #Kotlin #Java #Firebase #MVVM #Livedata #MVP #Android Studio ♛ 100% Client Satisfaction. ✅ 8+ years of experience as an Full Stack Developer. ✅ 8000+ Hours of work history as an Full Stack Developer ✅ Master's degree in Information Technology. Hi, I describe myself as a Senior Android Application Developer with experience of 7 years. I am a responsible developer. I do my work with the full dedication and strive for excellent quality. Over the period, I have worked on various projects and managed them as a Team lead in Android, PhoneGap and web technology. I have expertise in executing applications for Android platforms...

Aleksandr N.
$20/hr
  • Trophy Icon Kotlin
  • Android
  • Java
  • Firebase
  • Android App Development
  • Android SDK
  • Flutter
  • Android Studio
  • iOS

Hello! Thank you for visiting my profile. I am a Mobile application developer with more than 5 years of experience. My main strength and passion is Android platform (Android SDK, Firebase SDK, Google Maps, Twitter, Facebook, Material Design, MVP, MVVM). About a year of experience with React Native, iOS (swift, objective-c), Flutter I also have some knowledge and practice in Web development (mostly frontend): Html, CSS, JS (Angular, React, Vue). Backend development: Spring, Spring Boot, PHP (Laravel)

Rajat M.
$35/hr
  • Trophy Icon Kotlin
  • Native App Development
  • Mobile App Development
  • iOS Development
  • Swift
  • Firebase
  • Core Data
  • SQLite Programming
  • Web Service
  • Unit Testing
  • Android
  • Push Notifications
  • Flutter
  • Dart
  • React Native

✅ 100% Job Success ✅ Delivering high-quality apps since 2017 ➜ I have 5+ years of experience in creating native iPhone & Android apps ➜ I have developed a variety of applications for domains such as CRM, E-commerce, Social, Ride Sharing, Business, etc ➜ I also have good experience developing using the cross-platform framework Flutter. ➜ I am a full-time freelance developer and write quality code, clean, and robust code that makes the app run smoother & faster. ➜ Contact me for any iOS/Flutter projects or issues you need help with. 💎 Swift 💎 Firebase 💎 Kotlin 💎 React Native 💎 Google Flutter 🟢 WHO AM I? I have been working with...

Andriy D.
$25/hr
  • Trophy Icon Kotlin
  • Java
  • Android App Development
  • Android SDK
  • SQL
  • Mobile UI Design
  • HTML
  • CSS
  • React Native
  • Flutter
  • Android
  • Tablet

I am a Mobile developer with more than 4 years of experience and lots of successful projects behind. ♨ Technologies: ✔ Java(4 years) / Kotlin(2 years); ✔ Git; ✔ Android SDK/NDK; ✔ Android Jetpack (WorkManager, Room, Navigation, Lifecycle); ✔ Firebase (Analytics, Authentication, Cloud Firestore, Cloud Functions, Cloud Messaging, Cloud Storage, Crashlytics, Performance, Realtime Database, Remote Config); ✔ Gradle (Groovy and Kotlin DSL); ✔ RxJava, Kotlin Coroutines; ✔ Hilt, Dagger 2, Toothpick; ✔ SQLite, Room, Realm; ✔ Google APIs (Maps, Drive, Tasks, Places); ✔ ExoPlayer (DASH, SmoothStreaming); ✔ Glide; ✔ REST/JSON/XML ✔ Retrofit 2; ✔...

Sergey K.
$63/hr
  • Trophy Icon Kotlin
  • Android App Development
  • Java
  • Android
  • Android SDK
  • Android NDK
  • iOS
  • iOS Development
  • iPad App Development
  • Swift

For 9 years of working in mobile development, I helped more than 100 companies and individuals to grow, enhance, and maximize investments from their apps, include such apps like Fitbit, CamFind, Pure and others, you can find more examples in my portfolio. I had to work with projects at various stages of life. This experience helps me to review the current project process quickly, identify areas of need, and provide defined and strategic feedback to improve existing business processes to achieve project goals. Also, I provide service after the completion of the project. In my projects, I apply modern technologies which make the...

Muazzam A.
$25/hr
  • Trophy Icon Kotlin
  • Model View ViewModel
  • Java
  • Android Studio
  • Mobile App Development
  • Location-Based Service
  • Map Integration
  • Push Notifications
  • App Development
  • Android App Development
  • iOS Development
  • Mobile App Testing
  • Mobile UI Design
  • Google APIs
  • Git

I have a solid background in creating complex mobile applications for Mobile. I can work independently and respect a deadline. I am a hardcore Android engineer, having 8-year of experience, and a bachelor's degree in Computer Science. I have hands-on experience in Retail, healthcare, and commercial modern applications development in Android Studio. Technology Stack, I am using: • Kotlin • Kotlin Flow • Java • Android Jetpack • Retrofit • MVVM Architecture pattern • Dagger 2 • Firebase • Rxjava • Hilt • Room for database • MVP Architecture pattern Core Qualification I have: Android application development • Android...

Kulwinder S.
$15/hr
  • Trophy Icon Kotlin
  • Android SDK
  • Android
  • Android App Development
  • Java
  • Android Studio
  • Firebase
  • RESTful API
  • Google Maps API
  • Smartphone
  • Flutter
  • Dart

I'm professional android developer having experience of 4+ years in android app development. I primarily work on android development and like to build apps that not just looks good but also works great. Client satisfaction is my first priority and like to do hard-work to make your projects successful. ⚫ BASIC SKILLS OR TECHNICAL DETAILS ✔ Activities Or Fragments ✔ Media Player ✔ Broadcast Receiver...

Osemwingie O.
$30/hr
  • Trophy Icon Kotlin
  • Android
  • Android App Development
  • Java
  • Flutter
  • Model View ViewModel
  • JetPack

I am Osemwingie Oshodin, I am a value driven mobile engineer. I am proficient in Kotlin, Kotlin multiplatform, android architecture, Jetpack libraries, backend development using Ktor, and building cross-platform applications using Flutter I have successfully deployed multiple mobile applications built from scratch to the google play store. I have also contributed to many projects by working in a team. I have gone on to further my skills in software engineering by taking relevant courses and acquiring a google associate developer certificate. 
I am excited about learning new technologies. My utmost priority is to satisfy my clients by...

Shahzad H.
$35/hr
  • Trophy Icon Kotlin
  • Android App Development
  • iOS Development
  • Java
  • Swift
  • Docker Compose
  • Rust
  • Golang
  • iOS
  • Android
  • Mobile App Development
  • PHP

● Since September 2011, have 9 years of extensive hands-on experience of android and iPhone application development. ● Worked on all mobile operating systems including Android, iPhone, J2ME and blackberry. ● An experienced team lead and team player with excellent communication and interpersonal skills who has the ability to work independently under pressure. ● Ability to develop unique, cutting edge applications for different handsets and user requirements ● In-depth knowledge of industry practices and application development protocols

Abdulsamet K.
$35/hr
  • Trophy Icon Kotlin
  • User Authentication
  • Firebase
  • SQLite
  • In-App Purchases
  • Android Studio
  • Android Room Persistence
  • Java
  • In-App Advertising
  • Android App Development
  • Facebook Advertising
  • Android SDK

I am developing native Android applications in Android Studio by using Kotlin/Java programming languages. I follow the lastest approaches and best practices to develop apps. Skills: - Native app development throught the Android SDK - Version control system (Git) experience - Programming languages: Kotlin, Java - Experience in publishing apps in markets such as Google Play Store, Samsung Galaxy Store, Amazon Appstore - Admob, Facebook, Mopub, GPDR integration - Local,remote database knowledge (Firebase, Room library) - Reusable,clean code (MVVM architecture) - Experience in UI design - Adobe XD, Figma, Postman, Android Studio - Bug fixes,...

Dzemal I.
$50/hr
  • Trophy Icon Kotlin
  • Software Development
  • Android Studio
  • Android App Development
  • Java
  • In-App Search
  • Chat & Messaging Software
  • Firebase
  • Twilio API
  • RxJava
  • Android App Development
  • Android
  • Map Integration
  • User Authentication

✅ 5 years of experience in Android ✅ Java & Kotlin ✅ MVVM ✅ Unit Testing ✅ RxJava/Coroutines I approach all my projects professionally, working from startups to enterprises. I am adapting easily to new environments, learning and passing on my own knowledge in effort of improving the software I am working on. Very detailed in designing and testing my own code. Code quality comes first!

Agniva R.
$20/hr
  • Trophy Icon Kotlin
  • Adobe Illustrator
  • Mobile App Design
  • Mobile App Development
  • Business Card
  • Android App
  • T-Shirt Design
  • Web Development
  • Figma Expert
  • iOS
  • Graphic Design
  • Mockup
  • Node.js
  • Payment Functionality
  • Logo Design
  • Adobe Photoshop

I have 5+ years of experience in Graphics Design and Full Stack Development. I have a creative knowledge of Logo and UI/UX Design that makes your product attractive and professional to compete with the Modern Digital Market. I also have Expertise and knowledge in Web Development and mobile application Development both Android and iOS. Some areas of expertise: 1. UI/UX - Logo, Brochure, Business card, T-shirt design, Flyer 2. Graphics Design: Adobe Photoshop, Illustrator 3. Prototype Modelling Tools: Figma 4. Mobile App Programming Languages: Java, Kotlin, Swift, Objective C, JavaScript( React Native), Dart(Flutter) 5. Backend...

Phil B.
$55/hr
  • Trophy Icon Kotlin
  • Android
  • Android App Development
  • Android Room Persistence
  • Android Studio
  • Android SDK
  • Native App Development
  • Tablet
  • Mobile App Development

I have been freelancing for over a year, and have a 100% client satisfaction rate over a variety of complex projects. My speciality is MIDI and audio with native code, but I am also adept at generic Android client work, and can churn out screens at an impressive rate! I have written the most fully featured and music notation app for Android singlehandedly, as well as Forex trading tools, a Midi to MP3 converter, a band management system, forum browsing software and a discussion game for a charity. I have 14 years commercial experience in C/Linux. I adhere to sound software design principals (SOLID, TDD, Clean Architecture). I can learn...

Adam V.
$80/hr
  • Trophy Icon Kotlin
  • Web Application
  • iOS Development
  • Android App Development
  • Swift
  • Java
  • React Native
  • React
  • Ruby on Rails
  • Node.js

I'm a passionate programmer who has been working on my skills since high school. I have been educated and trained in modern IT techniques. I worked with a myriad of web and mobile technologies, frameworks, practiced both building apps from scratch and contributing to large pre-existing projects with legacy code. Throughout my career, I have completed many mobile app projects across different verticals, ranging from Fortune 500 companies to startups. I always keep up with the latest news and developments in the web and mobile world through meetups and self-teaching. Mobile technologies: - Platform: iOS, Android - Languages/Frameworks:...

Abdelrahman E.
$20/hr
  • Trophy Icon Kotlin
  • Android SDK
  • Firebase
  • Java
  • C
  • C++
  • Object-Oriented Programming
  • Data Structure
  • Algorithms
  • Software Testing

Innovative Android Developer with 2+ years of experience designing, developing, testing, and maintaining Android applications.

Stanislav N.
$75/hr
  • Trophy Icon Kotlin
  • React Native
  • React
  • Flutter
  • Java
  • Android App Development
  • iOS Development
  • Swift
  • Objective-C
  • JavaScript

Working experience for large companies such as Reddit Inc., Upwork Internal development team. Can build your Native Android app of any complexity. ✨ I am an expert in Android development with 9+ years of experience, currently working as a team leader, solution architect, and developer. I have substantial knowledge to build top-notch solutions for both Web and mobile platforms. I am familiar with modern programming languages, frameworks, and 3rd party solutions which help boost the app speed, safety, and provide the best user experience. As a Web, Native mobile developer, and Technical architect, I can develop scalable and stable...

Atendra S.
$20/hr
  • Trophy Icon Kotlin
  • Android App Development
  • Java
  • Firebase
  • Google Analytics
  • Location-Based Service
  • Social Media Account Integration
  • Map Integration
  • Payment Functionality
  • User Profile Creation
  • User Authentication
  • Android
  • Bluetooth
  • API Integration
  • Push Notifications

Upwork Android Stack ✅ 8+ Years Experience ✅ 21+ Mobile Apps More than 8 years of extensive experience as an Android Developer specialising in native Android application programming with SCRUM/Agile workflow. Domains: ◉ Airline Domain ◉ Banking Domain ◉ Cargo Management Domain ◉ Logistics Domain ◉ Financial Domain ◉ Social Media/Dating Domain/Video/audio chats ◉ Location Tracking Domain Mobile Development: ◉ Java, Kotlin, MVVM, MVP, MVC, Design pattern, Custom Controls, REST API ◉ Material design, Mobile UI/UX, Firebase integration (AdMob, Analytics, A/B testing, etc.) ◉ Jetpack Compose ◉ Firebase Realtime Database and...

Victor M.
$25/hr
  • Trophy Icon Kotlin
  • Android Room Persistence
  • Android
  • Unit Testing
  • BLE
  • Flutter
  • Android App Development
  • Bluetooth
  • Android SDK
  • Dart
  • Android Studio
  • Java
  • Firebase
  • Bluetooth LE
  • Google Maps API

8+ years of Mobile development experience in different technologies (Android, Flutter, Kotlin Multiplatform). I developed Flutter applications for police tablets for government, health care project to work with HRM/BPM and Android applications for smart sockets (with GSM-module) and smart devices to measure temperature (connect via Bluetooth and Wi-Fi), health care app for people with bipolar disorder, apps with video transcoding (mobile FFMpeg), advertising platform for TV, social network based on location, cloud storage, manage orders for loaders, time trackers for employees.

$NaN/hr

How it works

1. Post a job (it’s free)

Tell us what you need. Provide as many details as possible, but don’t worry about getting it perfect.

2. Talent comes to you

Get qualified proposals within 24 hours, and meet the candidates you’re excited about. Hire as soon as you’re ready.

3. Collaborate easily

Use Upwork to chat or video call, share files, and track project progress right from the app.

4. Payment simplified

Receive invoices and make payments through Upwork. Only pay for work you authorize.

Trusted by 5M+ businesses

How do I hire a Kotlin Developer on Upwork?

You can hire a Kotlin Developer on Upwork in four simple steps:

  • Create a job post tailored to your Kotlin Developer project scope. We’ll walk you through the process step by step.
  • Browse top Kotlin Developer talent on Upwork and invite them to your project.
  • Once the proposals start flowing in, create a shortlist of top Kotlin Developer profiles and interview.
  • Hire the right Kotlin Developer for your project from Upwork, the world’s largest work marketplace.

At Upwork, we believe talent staffing should be easy.

How much does it cost to hire a Kotlin Developer?

Rates charged by Kotlin Developers on Upwork can vary with a number of factors including experience, location, and market conditions. See hourly rates for in-demand skills on Upwork.

Why hire a Kotlin Developer on Upwork?

As the world’s work marketplace, we connect highly-skilled freelance Kotlin Developers and businesses and help them build trusted, long-term relationships so they can achieve more together. Let us help you build the dream Kotlin Developer team you need to succeed.

Can I hire a Kotlin Developer within 24 hours on Upwork?

Depending on availability and the quality of your job post, it’s entirely possible to sign up for Upwork and receive Kotlin Developer proposals within 24 hours of posting a job description.

Schedule a Call