Hire the best Kotlin Developers in Poland

Check out Kotlin Developers in Poland with the skills you need for your next job.
  • $45 hourly
    I am a Senior Frontend and Mobile developer with 6+ years of experience. I’m an expert in React, Angular, Vue.js and React Native development so I can build a clean codebase and optimize the app with the following experience. My expertise spans across fintech, blockchain, NFT, e-commerce, healthcare, logistics, and aviation sectors, allowing me to craft tailored solutions that address the distinct challenges and requirements of each industry with precision and innovation. My current skills include: React Native, Expo, React, Angular, Vue.js, Redux, Ionic, NativeScript, Flutter, Swift, SwiftUI, Objective-C, Java, Kotlin, JavaScript, TypeScript, Express, Node.js, Restful APIs, Apollo client, GraphQL, Jest, Strapi, Bootstrap, CSS3, PostgreSQL, Firebase, MongoDB, Azure, MySQL, Oracle, AWS and GCP. Customer satisfaction is my priority. Contact me with any questions or concerns, and I'll ensure you're taken care of. I look forward to hearing from you!
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Front-End Development
    Redux Saga
    Redux
    Redux Thunk
    Swift
    Objective-C
    NativeScript
    JavaScript
    iOS
    Android
    React Native
    TypeScript
    Firebase
    iOS Development
  • $35 hourly
    My name is Mikhail, I'm Senior Android&iOS And Senior Web Developer. So now I'm glad to see you here!) I have experience in development both huge-loaded websites for big companies and mobile applications for Android&iOS platforms. I took part at development for companies in spheres of medicine, sport, banking, real estate, e-commerce. The most popular products, which were made by me, have about 400-500k active users and total amount of users is more than 2M. My main principles are writing high-quality code and deep diving into the problems of my customers, to solve them in the best way. Skills: Mobile Development - Kolin/Swift/React Native - MVVM/MVI/VIPER/MVP - DI - SOLID&Clean Architecture - CI/CD - Firebase&Google APIs Web Development - Node.js/Typescript - React.js/next.js/Angular/Vue.js - Postgres/MongoDB - Docker/RabbitMQ
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Android
    iOS
    CI/CD
    Swift
    MERN Stack
    Mobile App Development
    Web Development
    React
    AJAX
    WordPress
    CSS 3
    HTML5
    Landing Page
  • $60 hourly
    With five years of production experience as a senior Mobile app developer, I have worked with several IT companies, including AgileEngine and SoftServe. My expertise extends to startups and large product development initiatives. Well-versed in working both as part of a team and independently, I enjoy freelancing to explore diverse projects and travel opportunities and am open to taking on full/part-time roles. I am committed to delivering the highest quality results to my clients.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Xamarin
    Swift
    Native App Development
    React Native
  • $50 hourly
    AWS certified full-stack developer with extensive experience in creating scalable distributed web applications for large and small businesses. 👨‍💻 8+ years in programming 🎓 Master's degree in Computer Science 🛠️ My Expertise: - Front-End: React, JavaScript, HTML5, CSS3, jQuery, Bootstrap - Back-End: Node.js, Java, Kotlin - Databases: MongoDB, MySQL, DynamoDB - Version Control: Git - Cloud: AWS – certified developer Looking forward to connecting, Paul.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    MongoDB
    Amazon Web Services
    jQuery
    React
    AWS Lambda
    Software Development
    Microservice
    Node.js
    SQL
    JavaScript
    Java
    CSS
    HTML
    Bootstrap
  • $63 hourly
    I help companies build high-value digital products since 2016. My expertise in PHP, Laravel, Vue.js and React.js allows me to combine high performance, code quality and overall ease of use with the needs of the various industries such as marketing, project management, eCommerce and more. I am a part of the Polcode team, a Polish software development company established in 2006 with over 150 developers, designers, project managers, DevOps and QA specialists onboard. This means that besides my programming skills you always have access to a full-stack product design & development team. My technical expertise: Code quality: Acceptance Tests, Unit testing with PHPUnit, PSR Standards, Design Patterns Version Control System: Git (Github, GitLab, Bitbucket) Issue Trackers: JIRA, Redmine, Trello My technology stack: Backend: PHP 5 & 7 / Laravel 4 & 5 / API / Symfony 4 / Java Frontend: JavaScript / jQuery / Vue.js / CSS / HTML5 / AJAX / Bootstrap Databases: MySQL, Firebase CMS: WordPress, Prestahop Other: Kotlin, C, C++, C# My approach: Good and efficient communication Following SOLID, DRY and KISS principles Providing usable, performant and high-quality code More about Polcode Polcode provides customized software solutions for startups, SaaS companies, eCommerce stores, and enterprise clients worldwide. From building the product from scratch to extending the existing teams, we have expertise in a diverse set of open source technologies and platforms to bring innovation in an agile fashion. Our team excels in PHP, Symfony, Laravel, Magento, Go, React Native, React.js, Vue.js, Ruby on Rails and Angular. With over 150 people, Polcode has either empowered client teams or delivered end-to-end development projects for brands from fintech, manufacturing, consulting, eCommerce, marketing or eLearning industries and is recognized as Top Developer in Poland by Clutch. Looking forward to our cooperation! Paweł, Polcode Dev Team
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Java
    PHP
    JavaScript
    MySQL Programming
    HTML
    C++
    Laravel
    Agile Software Development
    C#
  • $50 hourly
    With over six years of experience, I specialize in developing native Android applications for high-profile clients and businesses. My expertise encompasses the entire app development process, from planning and development to publishing, maintenance, and support, ensuring the delivery of high-quality Android applications. If you're seeking to create functional Android apps with effective design and performance, you've come to the right place. I understand how to satisfy your customers and increase your sales. I take on a limited number of projects at a time, allowing me to provide the necessary focus and time each one deserves. My commitment to quality control ensures that every project receives meticulous attention. Customer satisfaction is my top priority, and I consistently go the extra mile. I empathize with both my clients and their end-users, considering the unique needs, expectations, and preferences of the target audience. Throughout my process, I employ empathic design and techniques to uncover user values and aspirations. Strengths and skills: - Mastery of various architecture patterns, including MVP, MVVM, and MVI. - Proficiency with Firebase services such as push notifications, dynamic linking, analytics, Crashlytics, real-time NoSQL databases, and cloud functions. - Experience with Amazon Web Services, including EC2, API Gateway, S3 Buckets, Lambda functions, and push notifications. - Skilled in Google services like authentication, Google+, voice recognition, image recognition, text processing, and machine learning. - Familiarity with Dropbox storage APIs. - Integration of social media platforms such as Twitter, LinkedIn, and Facebook for authentication, analytics, and crash reporting. - Comprehensive knowledge of various application tools, including background services, system-level communications, file storage, notifications, offline apps, communication apps, wallpaper apps, and system tracking apps. Development tools and professional techniques: • Project Management Tools: Jira, Trello • Version Control Systems: Bitbucket, GitHub, GitLab, etc. • Communication Platforms: Skype, Zoom, Google Meet, Webex, Teams • Android Studio • IntelliJ IDEA • Postman • Charles Proxy I am eager to establish long-term relationships with clients and build a strong, ongoing working partnership. I will ensure that the overall budget is reasonable for you and your team. With lower maintenance costs, you can overcome any obstacles and lead a successful Android product to market.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Mobile App Development
    Mobile App
    Android App
    Android Studio
    Android App Development
    Android SDK
    Analytics
    Mixpanel
    Firebase
    Java
    Clean Architecture
    Retrofit
    Dagger 2
    Android
  • $50 hourly
    Creation and support of mobile applications. Created over 10 apps with over 5,000,000 installations.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    App Store
    SwiftUI
    Invoicing
    Google Play
    Analytics
    Google Ads
    Mobile App Development
    Swift
    iOS Development
    Android App Development
    RESTful Architecture
    Java
    Firebase
    Map Integration
  • $40 hourly
    Hi, I am an expert iOS app developer. With a strong passion for mobile application development and 10+ years of experience in iOS development, I am confident in my ability to contribute to your team and help drive the success of your projects. Throughout my career, I have built a solid foundation in iOS development, specializing in Swift and Objective-C. I have successfully delivered numerous high-quality mobile applications that have been featured in the App Store and received positive user feedback. My expertise extends to various areas, including UI/UX design, API integration, performance optimization, and version control systems. Some highlights of my qualifications include: Expertise in Swift and Objective-C, with a strong understanding of iOS frameworks and libraries. Proven track record of delivering high-quality iOS applications on time and within budget. Solid experience with RESTful APIs, JSON, and integrating third-party libraries. Proficient in using Git for version control and familiarity with tools like JIRA and Bitbucket. Strong problem-solving skills and ability to troubleshoot and debug complex issues. Excellent communication skills, both verbal and written, enabling effective collaboration with stakeholders and team members. I am highly motivated, detail-oriented, and dedicated to staying up-to-date with the latest industry trends and best practices. I thrive in challenging environments and enjoy solving complex problems to deliver innovative solutions. As a Senior iOS Developer, I would bring my technical expertise, leadership skills, and passion for creating exceptional user experiences to contribute to the success of your team.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    iPhone UI Design
    Core Location
    Android SDK
    Apple Xcode
    iOS SDK
    Java
    Swift
    UIKit
    Firebase
    Objective-C
    iOS
    Android
    Android App Development
  • $38 hourly
    I'm a highly focused and motivated software developer. Organized, methodical and a keen eye for detail results in solid coding and trustworthy mobile apps. Transforming client requirements into great apps based on a clear and quality code are core values in achieving long-lasting relationships. Technologies & tools Kotlin 5 years Android 5 years Swift 4 years iOS 3 years Dart 3 years Flutter 3 years
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    RESTful API
    API
    Blockchain
    Android SDK
    Flutter
    C++
    Swift
    Firebase
    API Integration
    Android
    Android App Development
    iOS
  • $50 hourly
    Full-stack software developer in the broadest meaning of this term. Experienced and familiar with programming at all levels of abstraction, from assembly to GUI. System-level, mobile, web. Designing and implementing a new programming language. I don't work well udder tight deadlines, but I'm yet to meet a problem that I'm unable to solve. In my free time, I love sewing.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    X86 Assembly Language
    Assembler
    Haskell
    Lua
    Dari
    Google Cloud Platform
    Flutter
    Scala
    Firebase
    C++
    Java
    JavaScript
    Python
    TypeScript
  • $35 hourly
    ✋ Representing Sixhands agency I am a highly skilled player with app and web development competencies and 8 years of experience in the industry. I have a deep understanding of the latest technologies and best practices in app and web development, and I am committed to delivering high-quality solutions that meet my clients' specific needs. My expertise includes developing custom apps for iOS and Android, building responsive and user-friendly websites, and integrating various APIs and third-party tools. I also have experience with e-commerce platforms, CMS systems, and database management. My approach to work is client-centric, and I strive to ensure that my clients are satisfied with every aspect of the project. From the initial consultation to the final product launch, I work closely with my clients to ensure that their vision is realized! In addition to my technical skills, I am a great communicator and collaborator. I believe that clear communication is key to successful projects, and I work closely with my clients to ensure that we are always on the same page. If you are looking for a reliable and talented app and web developer who can deliver exceptional results, look no further. Contact me today to discuss your project! If you are looking for a reliable and talented freelancer who can deliver exceptional results, look no further. Contact me today to discuss your project!
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Vue.js
    Android App
    Django
    CI/CD
    GitHub
    PHP
    React Native
    Flutter
    Swift
    React
    Angular
    iOS Development
  • $65 hourly
    Hello! I'm Boris, a Senior iOS and Android developer with 8 years of experience in big tech companies✌️ - Senior iOS Developer - Senior Android Developer - Advanced in Kotlin Multiplatform - Compose Multiplatform (similar to Flutter, but native for Android) My main competence is the development of high-load corporate messengers. Here are three complex challenges I've tackled throughout my career: 1. Developed a new encryption module for messenger application, enhancing communication security within the company. 2. Architecting applications based on Kotlin Multiplatform to ensure a single source of truth between iOS and Android platforms (core functionality such as network layer, data storage, as well as business logic up to the common ViewModel and data model). 3. Infrastructure tasks, such as expediting project build times through modularization, as well as implementing CI/CD setup. However, I also work on simpler projects: - Utility applications - Subscription-based services - Shopping and delivery apps Since I've led teams, I have strong competencies not only in development but also in UI/UX design and analytics. I can help you create a well-thought-out technical specification, design a prototype of the application with animations and interactivity. All this will save you money in the future, preventing the need for developers to rework functionality due to any inaccuracies. I work with both modern iOS/Android stacks and can assist with legacy projects and their maintenance. iOS: - Swift/Objective C - UIKit/SwiftUI - PinLayout/SnapKit - GCD/Operations/AsyncAwait - RxSwift/Combine - Core Data/Realm/GRDB/SQLite - URLSession/Alamofire - StoreKit/StoreKit 2/SwiftyStoreKit - REST/WebSockets/Socket IO/rSocket/gRPC - XCTest/Quick/Nimble - AVFoundation - TestFlight - CocoaPods/SPM - SwiftLint Android: - Kotlin/Java - Jetpack Compose/Android XML + View - Coroutines - RxJava/RxKotlin/Flow - Room/SQLite/Realm - Retrofit/OkHttp - Google Play Billing Library - REST/WebSockets/gRPC - JUnit/Espresso/Mockito - ExoPlayer/Android Media API - Leak Canary - ProGuard Kotlin Multiplatform: - Kotlin Coroutines - Ktor - SQLDelight - Koin/Kodein - Multiplatform Settings - Kotlin Test - Decompose - Compose Multiplatform - Kotlin Serialization - Napier - Moko resources Common: - Firebase services - AppsFlyer - AppHud - CI/CD (Jenkins/TeamCity) My main motivation is to solve my clients' problems, help build their businesses, and provide reliable technical support. 👍
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Figma
    Prototype Design
    UX & UI Design
    UX & UI
    Mobile UI Design
    Mobile App
    UI/UX Prototyping
    SwiftUI
    Mobile App Development
    UIKit
    Objective-C
    Swift
    Android
    iOS
  • $33 hourly
    For over 15 years I work as a software developer, mainly participating in mobile projects - starting my professional work with Palm OS through WinMobile, then developing for Symbian OS and Android platform nowadays (last 6 years ). But not only mobiles... I wrote millions of lines of source code for desktops - C/C++, C#, JAVA SE for both Win32 and Linux systems. I wrote windows server working as WIn32 service (using sockets, multithreading, STL) with MFC-based configuration and monitoring tool. I have some basic knowledge and experience with cross platform solutions - Qt, GTK+, WxWindows. During those 12 years I also tried myself in another areas * JavaScript, PHP, XML, Perl, Python programming * Databases - MS SQL 2K, mySql, SQLite - both programming and administration * Unit testing - JUnit, CppUnit, NUnit, Robolectric, Spock * Project Management basics - Agile, PMBOK * cloud computing/serverless - AWS, Google Cloud Platform, Firebase, Parse, Heroku Nowadays I want to use my knowledge and experience to provide high quality solutions for YOU and other clients all over the world. My mission is to complete many projects,to build significant portfolio and to gain more and more experience and practice.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Git
    SQL
    Android App Development
    RESTful Architecture
    Android
    GraphQL
    Java
    Python
    JUnit
    Amazon Web Services
  • $50 hourly
    Hello at my profile! I am an independent freelancer with 11+ years of experience in software development. I've been part of many start-ups and helped them reach new funding rounds. The most successful reached 55$ million in Series B round. I also created and published many of my own apps from scratch. I'm a full stack developer. I can confidently handle both front-end mobile app development and back-end server application tasks for your project. I always take ownership for all apps I develop so quality and UX comes first. Did I mention I value great and concise communication with quick response times? --------------------- Stack: Kotlin, Android SDK, Clean Code, Clean Architecture, MVVM, MVP, MVC, RxJava, RxAndroid, Coroutines, Android Jetpack, Room, Realm, Hilt, Dagger2, Android Auto, REST, CI/CD, Github Actions, E2E, API, REST, GraphQL, Optimisation, Java, Google Cloud, Google App Engine, Agile, Scrum, Jira, Mentoring, Flutter, Dart, Unit Testing, Espresso, Appium, NFC, iOS, React Native, Unity, Firebase, Google Play, UI/UX, NoSQL, SQL. And way more.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    CI/CD
    RxJava
    ChatGPT
    Android Room Persistence
    Google App Engine
    Google Cloud Platform
    RFID
    Android SDK
    GitHub
    Android
    Java
    React Native
    Mobile App Development
    Android App Development
  • $60 hourly
    Senior iOS Developer (Objective-C, Swift) with 11+ years of experience and a Bachelor’s degree in Computer Science. Android Developer (Java, Kotlin) with 4+ years of experience. I have been working with iOS platform since the beginning of my professional career and always keeping my related skills up to market standard. I've been using modern cutting-edge stuff as much as supported older versions of the operating system. I have data science specialist background, which I believe improved my analytics skills and it's rather easy for me to jump to a new project and start working on it as if I was involved all along. I often spend my free time to learn about other technologies and platforms.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    RxJava
    iPad App Development
    RxSwift
    Apple Xcode
    iOS
    Android
    iOS Development
    Mobile App Development
    Swift
    Objective-C
    Java
  • $50 hourly
    Android development and maintenance Complete applications, prototypes, proof of concept, maintenance, legacy support Integration with popular social media platforms Google resources e.g. Maps, Analytics, ads E-commerce, in-app purchases, point-of-sale tools Technology: - Programming languages: Java, Kotlin, SQL - Architecture: MVVM, MVP, clean code - Professional software engineering tools and methodologies
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    RESTful Architecture
    JavaFX
    JSON
    Git
    Java
    Android App Development
    In-App Advertising
    Smartphone
    Android SDK
    API Integration
    SQLite Programming
    Chat & Messaging Software
    Android
  • $40 hourly
    • Experience: 8+ years in Android Development, 5+ years in Test Automation. • Industry Sectors: e-commerce, IPTV & VOD, IM & VoIP, puzzle games, ads, ticketing, RMM. • Methodology: Waterfall, Agile (Scrum, Kanban). • Good team player willing to reach a consensus on contentious issues. • Background in providing technical guidance and assistance to less experienced team members. • Ability to adapt easily to new environments and react quickly to new challenges. Programming Languages • Solid experience in Java and Kotlin. • Some experience in JavaScript ES5 (iOS UiAutomation) and ES6 (React Native). • Basic experience in C/C++, Groovy, Python. Languages, formats, protocols • HTTP, REST, WebSocket • JSON, XML, XPath, XSLT, HTML, RegExp • UML (PlantUML) Android Tools & Libraries • Android SDK, AndroidX/AppCompat, Android KTX • Custom View/ViewGroup creation, Jetpack Compose • View Animation API, Object Animator API • ButterKnife, Jetpack Data/View Binding • Play Billing, Material Design 2/3, Biometric API, Location API, Google Maps API • Light/dark mode support (DayNight theme) • Phone/tablet UI support (master-detail UI) • SQLite, SQLCipher, Realm, DBFlow, Room (DB ORM) • Dagger2, Hilt (DI frameworks) • OkHttp, Retrofit, Gson (HTTP networking) • EventBus, RxJava2, Kotlin Coroutines, Flow (async programming) • Picasso, Glide (image processing) • Crashlytics, Flurry, Firebase (analytics SDK) • Appodeal, MoPub (Ad SDK) • Configure app building process with Gradle • MVP, MVVM, Clean Architecture, Single Activity (app architecture) • JadX, apktool, smali/baksmali (reverse engineering) IDE • Eclipse, IntelliJ IDEA, Android Studio, Visual Studio Code QA Tools, Unit & Automated Testing • JUnit, TestNG, Log4j • Selenium WebDriver, HtmlElements • Appium, AndroidDriver, iWebDriver • Xcode Instruments (UiAutomation) • HP QTP (VBScript) • bugDB, Oracle Test Manager, Zephyr for JIRA Source Control Systems • Git (GitHub, Bitbucket, GitLab, Gerrit), Perforce Building Tools & Dependency Managers • Apache Ant, Maven, Gradle Project Management & Issue Tracking System • JIRA
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Android Tablet
    JetBrains IntelliJ IDEA
    Mobile App Development
    Mobile App Bug Fix
    Firebase
    Android SDK
    Android App Development
    Android
    Android Studio
    Java
  • $25 hourly
    ✅ TOP RATED PLUS by Upwork ✅ 100% Job Success (Client Satisfaction Ratio) ✅ 1000+ Hours and still counting! ✅ Fluent English Verified ✅ 6 Years Of Experience ✅ Long-term working relationship I am a professional software engineer having 6 years of experience in demanding environments focused on producing cutting-edge systems for the Software Industry. Skilled and experienced in Full Stack Web Development in multiple technologies like Backend in (.NET Core, Spring Boot, and NodeJS), Frontend in (Angular and ReactJS), Databases (SQL Server, MySQL, PostgreSQL, Oracle, MongoDB, and RavenDB), Unit Tests in (xUnit, NUnit, MSTest, JUnit and Mocha), Test Automation in (Cypress and Silicon), Cloud in (Azure and AWS).
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    C++
    Web Design
    ASP.NET MVC
    Azure App Service
    .NET Core
    API Integration
    ASP.NET Web API
    Angular
    Azure DevOps
    React
  • $36 hourly
    Senior Android Developer with 5+ years of experience in full app development life cycle, inclusive of implementation, testing, releasing and support. Work in broad range of industries - Banking, B2B, TV broadcasting, Photo Editing, IOT, Healthcare.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    RxJava
    Dagger 2
    Android App Development
    SQLite
    Retrofit
    Java
  • $20 hourly
    Hello, I'm a freelancer Yevhenii Senior Mobile and Game Developer with 6+ years of experience Field of competencies: ● Android Development ● IOS Development ● Game Development ● Domain Knowledge IT and Implementation skills: ● Programming: Java, Kotlin, C#, C++, Lua ● Frameworks: Android SDK/NDK, AOSP, Kotlin Multiplatform, Unity, Retrofit, Gson,Okhttp, RxJava, RxAndroid, RxKotlin, Kotlin Coroutines, MVI, MVC, MVP, MVVM, Glide, Picasso, .Net ● Databases: SQL, SQLite, ROOM ● Development Tools: Bitbucket, Github, Gitlab, Android Studio, Visual Studio, SourceTree, Plastic Git, Github Desktop ● Bugs and project reporting: Jira, Redmine, Trello ● Others: MS Office, terminal of MacOS and Windows, QA skills
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    VR Application
    ARKit
    Lua
    C++
    C#
    Game Development
    Java
    Unity
    Mobile App
    Clean Architecture
    Mobile Game
    Android SDK
    iOS Development
    Android App Development
  • $33 hourly
    I am Android developer with more than 5 years commercial experience and focusing on native Android development. I am using Kotlin and JAVA languages. I am responsible and flexible during implementation processes, understand principles around app UX, pretty good at architecture and design patterns. Friendly, honest and hard-working. I’ve graduated Yanka Kupala State University of Grodno as a Math-System programmer.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Agile CRM
    RESTful API
    SSL
    SOAP
    ScrumWorks
    Bluetooth LE
    XML
    RxJava
    Dagger 2
    Koin
    C#
    C++
    Java
  • $15 hourly
    Hi, I am a highly skilled Software engineer, with 8 years hands on experience in Software development. I have worked on project of multimillion dollars with large client For example I have worked with Walmart Lebara MyK+ And some confidential clients. My core skills are: Java, Core Jave, Spring Framework, Spring MVC, Spring boot, Spring batch, Spring Security, Kotlin, ROR, Sql DB, No Sql DB, and many more
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Microsoft Azure SQL Database
    Spring Cloud
    AWS Application
    Splunk
    Spring Batch
    Spring Boot
    Spring Framework
    Spring Data JDBC Extensions
    Spring Security
    Azure Cosmos DB
    Spring Data
    Java
    SQL
    Spring MVC
  • $13 hourly
    I am a skilled Java developer with extensive experience in building high-performance, scalable, and reliable applications. With over 3 years of experience in the industry, I have honed my skills in Java development, including core Java, J2EE, Spring Framework, Hibernate, and Maven.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Automation
    Scripting
    Data Scraping
    AWS Application
    Oracle
    AWS Amplify
    Docker
    RESTful Architecture
    Java
    Golang
    RESTful API
    MySQL
    Spring Framework
    Redis
  • $55 hourly
    Experienced senior software engineer focused on intricate methodologies for software, framework, and platform advancement for mobile and embedded systems. Vast experience in the entire software development life cycle, encompassing gathering requirements, creating designs, writing code, conducting tests, managing teams, troubleshooting issues, facilitating communication between teams, and providing ongoing maintenance. Fluent in English. Strengths include: • Development for iOS 3+ and MacOS 3+ • Development for Android 4+ • Development for Kotlin 4+ • Cloud / Data Engineer 4+ • Object Oriented Development • Multithreaded development • Performance and resource consumption optimisation • Porting and adopting to embedded and mobile platforms • Software profiling, optimization and refactoring • Team and project management Languages: Python, Java Script, C++, Kotlin, Java, JS, C#, SQL. Frameworks / Libraries / CMS: Caffe, TensorFlow, Pytorch, numpy, pandas, keras, scipy, matplotlib, DVC, MLFlow, asyncio, threading, concurrent, multiprocessing, Jetpack, Retrofit, Dagger, Hilt, Compose, Room, MVP, MVVM, Clean Arch, Coroutines Dagger, Retrofit, MVC, REST, SOLID, MVI, Material design, Lifecycle, .Net Core, .Net Framework, HaMeR, Linux, Microsoft Windows, MacOS. Databases: MySQL, SQLite, DynamoDB, Postgres, Firebase, Redis, Mongo. Backend stack: Node.js, Express.js, Nest.js, JWT, Websockets, AWS, PostgreSQL, MySQL, MongoDB. Frontend stack: React, Next, Remix, Typescript, Redux, Redux thunks, Redux toolkit, SASS/LESS, Material UI, Bootstrap, Blueprint. Operating Systems: Windows 7/8/10, Linux (Ubuntu), MacOS. Development tools: Git, npm, Docker, Jira, Postman, AWS ECS, Redshift, Glue, bash, Tableau, Neptune, SuperAnnotate, Cisco, Gitlab CI/CD, Terraform, Ansimble, Apache Kafka, K8s, Kubeflow, Minikube, Prometheus, Graphana, Kubesphere, Apache Spark, Airflow, Rabbit MQ. Other Skills: HTML5, HTML, CSS, AWS, Azure, XML, JSON, RabbitMQ, Jira, Confluence, Docker, Snowflake, Git. Methodologies: Agile, Scrum, Kanban. Specialisations: mobile development, kernel modules development, multimedia development, language processing, embedded systems development, embedded GUI (QWS based systems), database development. Specialties: Objective-C / Cocoa, Qt / QML / C++ embedded developer and system architecture. Soft skills: Professional, Intuitive, Adaptable, Learner, Listener, Tolerant, Positive, Leadership, Rational.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Android
    QA Automation
    DevOps
    SaaS
    Node.js
    React
    PostgreSQL
    MongoDB
    SQL
    C#
    C++
    JavaScript
    Python
    Java
  • $40 hourly
    Experienced Android Software Engineer passionate about user-centric apps. Skilled in frameworks, UI/UX, and agile methodologies, driving projects efficiently.
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Git
    JUnit
    Dagger 2
    Koin
    Retrofit
    Realm Database
    RxJava
    Coroutine
    Java
    JetPack
    Android SDK
  • $45 hourly
    👋 Welcome to my Upwork profile! I am Eugene an Android developer with 5+ years of experience in developing, deploying and supporting mobile applications. I prioritize delivering high-quality work and meeting deadlines. I make it a point to be easily accessible and maintain regular communication with you to keep you informed about the progress of the project. I strive to have a clear understanding of your vision and requirements. Honesty and fairness are values I hold dear. Market segments: 🔸 VPN & Security 🔸 Healthcare 🔸 eCommerce & Marketplaces 🔸 Social Applications 🔸 Medical Applications 🔸 Fitness & Wellness 🔸 Smart Devices (BLE & WiFi) 🔸 Telemedicine 🔸 Fitness Hands-on Experience: - Firebase - Push Notification - Amazon Web Services (AWS) - Database management - Realtime audio and video calls - Barcode / QR code readers - User management, user profile (sign in, sign up, authentication) - Payment processors - Payments with Credit Cards - Firebase Cloud Messaging - OpenVPN - Wearables - NFC - GPS & Location services - In-App Purchase & Subscriptions - Social Networks: Instagram, Facebook, Twitter - Google Material Design - Google Play - Google Cloud Console - Map integration And by the end some technologies and skills in which I have a strong experience: ✔️ Android(2.3.+..): Fragments API, Google Fit SDK, Google Maps, Retrofit, Bluetooth Low Energy, Kotlin; ✔ Kotlin Coroutines, Flow; ✔ Jetpack Compose ✔ Clean Architecture ✔ Dependency Injection (Dagger 2 | Hilt | Koin) ✔ Agora Voice/Video SDK ✔️ MVVM ✔️ REST APIs & Web services (Retrofit | OkHttp) ✔️ GraphQL ✔️ IDE (Android Studio) ✔️ Java Core: Java Core, Multithreading, Collections API, etc; ✔️ VCS (Git | GitHub | Bitbucket) ✔️ Task Tracker (Jira | Trello | Asana | ClickUp) ✔️ SQL, SQLite, Room Library ✔️ Gradle (Groovy | Kotlin DSL)
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Google Cloud Platform
    Google Play
    Agora.io
    Telegram API
    DeepAR
    Amazon S3
    REST API
    Bluetooth LE
    Java
    GraphQL
    Firebase
    Bluetooth
    Mobile App Development
    Android
  • $12 hourly
    I'm a young, dynamic software developer with a passion for crafting digital dreams from inception to reality. With a mix of youthful enthusiasm and valuable experience, I thrive on Agile methodologies and love the thrill of full-stack programming. Let's turn your ideas into code!
    vsuc_fltilesrefresh_TrophyIcon Kotlin
    Golang
    Next.js
    GraphQL
    Microsoft Azure
    Rust
    Elixir
    React
    Node.js
    TypeScript
    Spring Framework
    Kubernetes
    Linux
    C#
    Java
  • Want to browse more freelancers?
    Sign up

How hiring on Upwork 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.