Hire the best Kotlin Developers in Poland

Check out Kotlin Developers in Poland with the skills you need for your next job.

Get started

$50 hourly
Thomas K.
- 5.0/5
- (6 jobs)
☁️ FULL-STACK SOFTWARE ENGINEER | AWS | JavaScript | TypeScript | React | NodeJS | .Net ☁️ I'm a Full-Stack Software Engineer passionate about creating scalable and performant back-ends with beautiful and fluent front-ends. With a Master of Engineering degree, you can be sure my exceptional analytical and problem-solving mindset will bring extra value to your projects. 👉 I'll be a perfect candidate for your next project. Here's why: ✅ Expert in .NET, C#, Entity Framework and ASP.NET ✅ Highly proficient in TypeScript, JavaScript, Node.js, React ✅ Proficient in AWS based software development ✅ Proficient in Android Kotlin app development ✅ Familiar with various SQL databases ✅ Familiarity with OpenTelemetry and telemetry concepts ✅ Detail-oriented and committed to delivering high-quality work ✅ Keeping clients up-to-date with any changes so everyone is aware of what's being done at any given moment 🎓 EDUCATION 🔸I hold a Bachelor of Engineering Degree in Computer Sciences 🔸I hold a Master of Engineering Degree in Computer Sciences with spieciality in Intelligent Internet Technologies (AI in context of internet. technologies) I'm your ideal candidate if you're looking for a passionate Full-Stack Software Engineer with a unique blend of skills. Let's create something extraordinary together!

Kotlin
Amazon ECS
AWS Lambda
AWS Development
Amazon Web Services
Android App Development
.NET Core
Node.js
Java
Python
SQL
ASP.NET Core
C#
TypeScript
React
$50 hourly
Pavlo T.
- 5.0/5
- (153 jobs)
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.

Kotlin
MongoDB
Amazon Web Services
jQuery
React
AWS Lambda
Software Development
Microservice
Node.js
SQL
JavaScript
Java
CSS
HTML
Bootstrap
$75 hourly
Andrii C.
- 5.0/5
- (5 jobs)
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.

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
$44 hourly
Pavlo R.
- 5.0/5
- (11 jobs)
Web&Mobile Applications. Experts for your product 💡 Team of Full-stack Developers with of 5 stars ⭐ and 100% JSS projects 🚀 ✅ 𝐖𝐇𝐀𝐓 𝐖𝐄 𝐎𝐅𝐅𝐄𝐑: 💡 Web Development 💡 Mobile Development 💡 Product Concepting 💡 Product Design 💡 Quality Assurance 💡 DevOps 💡Marketing ✅ 𝐓𝐄𝐂𝐇𝐍𝐎𝐋𝐎𝐆𝐈𝐄𝐒 𝐖𝐄 𝐔𝐒𝐄: 🖥 Front-End: JavaScript, React.js, Vue.js, Next.js, Nuxt,js ⌨️ Back-End: Python, Django, Flask, Sanic, Node.js, Express.js, Koa.js, Nest.js 📱 Mobile: React Native, Swift, Kotlin, Flutter ⚙️ DevOps: AWS, GSP, Microsoft Azure, Docker, Docker Compose, Kubernetes, Ansible 💿 Database: MySQL, MongoDB, PostgreSQL, DynamoDB 📱UX/UI Design: Figma, Sketch, Adobe Creative Suite, Zeplin ✅ 𝐖𝐇𝐀𝐓 𝐘𝐎𝐔 𝐂𝐀𝐍 𝐄𝐗𝐏𝐄𝐂𝐓: 🤝 We are your reliable partner, guiding your product from ideation to launch; 🔧 Even after product release, we offer support and maintenance services; ⏱️ By partnering with us, you can save time and effort compared to hiring on-site freelancer experts; 📚 Our team provides comprehensive documentation for your product; 🔄 Full SDLC lifecycle, encompassing UI/UX, development, management, and quality assurance. 🔥🔥🔥 Are you seeking a trusted and reliable development partner? You've opened the right door. Click "Invite" and start feeling the difference 🥁

Kotlin
UX & UI
Amazon
OpenAI API
iOS
Android
Flutter
Swift
Vue.js
React
Node.js
Python
Product Design
Mobile App Development
Web Development
$39 hourly
Mykola M.
- 5.0/5
- (1 job)
📱 With a robust background as an iOS developer since 2010 and an Android developer since 2015, I specialize in developing versatile, enduring, and reliable mobile application solutions tailored for the Digital Goods market, with a particular focus on 📖 e-books and 🎧 audiobooks. Additionally, I have extensive experience crafting solutions for various industries including Productivity, Shopping, Education, and Medical sectors. I prioritize proficient project and resource management to ensure timely delivery and adherence to budgetary constraints ⏰💰. 🔄 A meticulously devised software development strategy is crucial for the success of any product. When collaborating with clients, I design and implement processes that promote efficient and seamless teamwork, both internally and in client-facing interactions. I advocate for an agile approach to software development and actively solicit client feedback throughout the project lifecycle. 📈 I am convinced that this structured approach is pivotal for the timely and effective execution of products that align with client objectives. This methodology has empowered me to assist clients in developing applications for diverse platforms, tailoring solutions to meet specific market demands and client needs. ✅ In addition to proficient coding skills, I highly value responsibility, responsiveness, and reliability. These qualities are what I guarantee to my future clients and appreciate in my existing clients. I am seeking long-term projects where I can take full responsibility for my work and have the commitment to maintain the solutions I build over time. 📱𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 𝐚𝐧𝐝 𝐓𝐨𝐨𝐥𝐬 🛠️ 🧑‍💻 𝐋𝐚𝐧𝐠𝐮𝐚𝐠𝐞𝐬 • Objective-C • Swift • Kotlin • Java • Flutter • React Native • SQL • Python • Ruby • AppleScript 📦 𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬 & 𝐀𝐏𝐈𝐬 & 𝐦𝐨𝐫𝐞 • UIKit • AVKit • SwiftUI • SwiftData • Core Data • Core Location • Store Kit • Android Jetpack • DI (Hilt) • Navigation • Compose • Room • Coroutines • LiveData • Flow • Social APIs • REST • App Extensions • MVI • MVVM (Data-Binding) • Design Patterns • Clean Architecture • Digital Rights Management (DRM) 🔧 𝐒𝐃𝐊𝐬 & 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐓𝐨𝐨𝐥𝐬 • xCode • Android Studio • Build Scripts • PSPDFKit • Colibrio Reader • Readium LCP 📂 𝐒𝐨𝐮𝐫𝐜𝐞 𝐂𝐨𝐧𝐭𝐫𝐨𝐥 • Git 🎵📄 𝐌𝐞𝐝𝐢𝐚 & 𝐅𝐢𝐥𝐞 𝐅𝐨𝐫𝐦𝐚𝐭𝐬 • ePub • ePub3 • PDF • HLS • MP3 📞 If you are looking for reliable resources and planning for a long-term, enjoyable journey for your existing or future mobile application, don't hesitate to schedule an introductory call with me. I can share my expertise in detail. Let's take your business to the next level with modern mobile solutions. 🚀

Kotlin
User Acceptance Testing
Dart
Java
Swift
Smartphone
User Profile Creation
Android App Development
iOS Development
AI Mobile App Development
Mobile App Development
React Native
Flutter
Android
iOS
$38 hourly
Roman P.
- 5.0/5
- (5 jobs)
⚠️ 𝐏𝐫𝐞𝐬𝐬 𝐈𝐧𝐯𝐢𝐭𝐞 𝐁𝐮𝐭𝐭𝐨𝐧 𝐨𝐧 𝐦𝐲 𝐩𝐚𝐠𝐞 𝐚𝐧𝐝 𝐥𝐞𝐭'𝐬 𝐭𝐚𝐥𝐤 I'm a highly focused and motivated Mobile Team Lead developer at Itexus. 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. I have 7+ years of experience in mobile development using Android, Kotlin, Java, and iOS, Swift, Objective-C, Flutter. I do not work with React Native. Technologies & Tools Kotlin | Java | Android | Swift | iOS | Dart | Flutter | KMM | KMP| Kotlin MutliPlatform | JavaScript | HTML | CSS | React Native | ReactNative | Native Mobile Development | Dagger 2 | Koin | GetIt | MobX | ReactiveX | Kotlin’s flow | Coroutines | Cicerone | Navigation Component | Realm | Room | Retrofit | OkHttp | Moshi | Scarlet | Apollo | Dio | Compose | ViewBinding | Splash Screen API (animated) | MPAndroidChart | RiverPod | Freezed | Groovy | Kotlin DSL Our Expertise at a Glance • Mobile App Development: Android, iOS, & Cross-Platform App Development using Java, Kotlin, Swift, Objective C, Flutter, and more. • Website and Full Stack Development: Crafting seamless back-end experiences with .Net, Python, Java, Javascript, React.js, Angular.js, Node.js, MERN, MongoDB, PHP, etc. • Logo & UI/UX Design: Bringing your ideas to life with Adobe XD, Photoshop, Sketch, Figma, etc. • End-to-End Solutions: From logo design, UI/UX development, workflow setup, testing to deployment in app stores, we've got it all covered. We do not use v0.dev lovable.app CursorAI, Cursor, Windsurf, Trae, GitHub Copilot, Tabnine, Qodo, Devin AI, and AutoDev for speed up coding, we know other methods to do it efficiently. Our General Expertise at a Glance Mobile App Development: Android, iOS, Cross-Platform using Flutter, Swift, Objective C, React Native, Xamarin, Apple Xcode, Smartphone, Tablet, etc. Website & Full Stack Development: Full stack development with .net full stack developer, .net software engineer, .net programmer, full stack developer, python full stack developer django, full stack web developer, full stack development, cms developer. DevOps/DevSecOps: AWS, Azure, Docker, Kubernetes, GitLab-CI, Ansible, Terraform, etc. Cross-platform app building with three.js, web application design, webflow web designer, website builders. Integration tools: Data integration, websockets, ABP Framework, discord, Autotask. Industries We Cover Healthcare, Transport, Retail, Asset Management, Wealth Management, Real Estate, Dating, Rental, Food Delivery, Fintech / Finance and Banking, Cryptocurrency, Entertainment, Hospitality, Non-Profit, Sports and Fitness, Travel and Tourism, Wellness, Medical Dashboard, Marketplace, Advertising, Automotive, Aircraft, Business Innovations, Human Resources, LegalTech, Lifestyle, Marketing, Education, E-learning, Insurance, IoT, E-commerce, Enterprise. Highlighted Skills Artificial Intelligence | E-commerce Solutions | Chatbots | Version Control Systems | Git | GitHub | Project Management and Collaboration Tools | ClickUp | Jira | Trello | Documentation and Code Commenting | SEO and Maintenance | MVP SAAS | Rebuild | Prototype | Start-Up | High-Friendly Custom Development | Transform | Solution | Ensure | Create | Enhance | Implement | Great Problem-solving | Excellent Communication | Assist | Collaborate | Mobile App Development | Web App Development | User Interface Design | Payment Integration | Stripe | Payment Gateway | ERP | CRM | User-friendly Interface | Mobile App Development | Mobile App Developer | Flutter App | Flutter Developer | Flutter Firebase | Flutter Dart | Flutter App Developer | App Developer | Mobile Developer | React Native | React Native Mobile App Development | Mobile App Builder | Flutter App Developer | Flutter Laravel | Mobile App Development | Mobile App Developer | Flutter App | Flutter Developer | Flutter Firebase Business with 1000+ Employees | Business with 10-99 Employees | Business with 100-999 Employees | Business with 1-9 Employees | Apple HealthKit | AI Marketplace | Waste Management & Remediation | AI App Development | Healthcare | Android App | Audio Conversion | ChatGPT API | Dating & Social Life | NFT Marketplace | Ecommerce Website Development | AI Speech-to-Text | Email Campaign Setup | API | Startup Company | Artificial Intelligence | Health Coaching | Health | Maintenance Management Talent Good Knowledge, Talented, Experienced, Skilled, Strong Experience, Proven Experience, Agency, Team, Company, Specialist, Proven Track Record, Strong Background, Write Clean Code, Deep Expertise, Bring to Life, Cross-platform, Attention to Detail, Long Term. ⚡️ AVAILABLE FOR NEW PROJECTS ⚠️ Press Invite Button on my page and let's talk

Kotlin
RESTful API
API
Blockchain
Android SDK
Flutter
C++
Swift
Firebase
API Integration
Android
Android App Development
iOS
$50 hourly
Jakub T.
- 5.0/5
- (116 jobs)
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.

Kotlin
X86 Assembly Language
Assembler
Haskell
Lua
Dari
Google Cloud Platform
Flutter
Scala
Firebase
C++
Java
JavaScript
Python
TypeScript
$35 hourly
Kirill T.
- 4.7/5
- (5 jobs)
✋ 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!

Kotlin
Vue.js
Android App
Django
CI/CD
GitHub
PHP
React Native
Flutter
Swift
React
Angular
iOS Development
$45 hourly
Vitaly S.
- 5.0/5
- (24 jobs)
Senior Android Developer with more than 12 years of experience Have worked in various domain areas such as Healthcare, Fintech, Social Media, Game industry. During my career I have gained great communication skills with my clients as well as good understanding of working in diverse and distributed teams Tech stack currently used: Android SDK, Kotlin/Java, MVVM/Clean architecture, Coroutines/RxJava, Dagger2/Koin, Retrofit, Firebase, Room DB, Bitrise/CircleCI CI/CD, Unit Tests, UI Tests (Espresso/UIAutomator), Screenshot tests, Sonarqube code quality control I’m looking forward to work with you!

Kotlin
Model View ViewModel
JSON
Dagger 2
RxJava
RESTful Architecture
Android App Development
Firebase
Java
$50 hourly
Dominik O.
- 5.0/5
- (23 jobs)
Hello at my profile! I am an independent freelancer with 11+ years of experience in software development. I've been part of many start-ups and helped them reach new funding rounds. The most successful reached 55$ 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.

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
$50 hourly
Sergey G.
- 4.8/5
- (175 jobs)
Hi, I’m the founder of Symfa, a web and mobile development company that has been providing modern technology solutions since 2008. Over the years, we’ve helped businesses from 20+ countries facilitate their product and process digital transformation. My mission is to help clients achieve their goals by leveraging the latest technologies. As an experienced CPQ Specialist, I work with companies to automate the product configuration, pricing, and quote generation processes. With my expertise in setting up and optimizing CPQ systems, I help improve sales processes, accelerate proposal creation, and ensure pricing accuracy. I’ve also had the opportunity to cofound a solution aimed at automating these very processes, which gives me an additional perspective when customizing CPQ solutions for businesses. My Core Competencies: 🟢 Product & Service Configuration: I assist in setting up product parameters and options within CPQ systems to meet client specifications. 🟢 Pricing Calculation: I design algorithms for automatic pricing based on taxes, discounts, and business rules. 🟢 Proposal Generation: Automating proposal creation, customized to your unique business needs. 🟢 System Integrations: Integrating CPQ systems into your existing workflows and ERP systems. 🟢 Sales Process Optimization: Refining the proposal creation process, reducing errors, and improving efficiency.

Kotlin
NodeJS Framework
Quality Assurance
DevOps
Vue.js
Business Analysis
.NET Core
Angular
Node.js
JavaScript
C#
Flutter
Swift
TypeScript
React
$35 hourly
Evgenii K.
- 4.7/5
- (16 jobs)
My name is Evgenii I am mobile developer with a huge experience in this area. I am creative, resourceful and flexible, able to adapt to changing priorities and maintain a positive attitude and strong work ethic. Skills: - Solid understanding of the full mobile development life cycle. - Working knowledge of the general mobile architectures, trends, and emerging technologies. - Proven working experience in iOS. - Proficient with Swift/Objective C. - Strong understanding of the patterns and practices that revolve around the iOS platform. keywords: mobile apps, mobile app development, native mobile app, iOS, Swift, Objective-C, Android, CRM, ERP, IoT, SmartTV, AppleTV, iPad, iPhone, Apple Watch, smartwatches, mobile UI design, UX/UI, iOS UI design, iOS mobile App, iOS App Development, App Development

Kotlin
iPhone UI Design
Mobile App Development
iOS Development
Swift
Objective-C
Java
Android
$35 hourly
Alan K.
- 5.0/5
- (15 jobs)
With over three years of experience leading Android development teams, I specialize in creating innovative mobile solutions that elevate user experiences. My expertise spans a wide range of skills, including Android development, technical documentation, product management, app deployment, and software architecture. I excel in team leadership, fostering collaboration and driving continuous improvement, while skillfully managing conflict resolution and ensuring smooth operations. Proficient in Java and Kotlin programming, version control systems, API integration, and database management, I bring technical depth to every project. From managing issue tracking systems to optimizing apps for social media platforms, I thrive on delivering high-quality results and pushing the boundaries of mobile technology to achieve exceptional outcomes. I am confident that my skills and experience align perfectly with your needs, and I am excited about the opportunity to contribute to your project. Thank you for considering my application. I look forward to the possibility of working together.

Kotlin
RESTful Architecture
JavaFX
JSON
Git
Java
Android App Development
In-App Advertising
Smartphone
Android SDK
API Integration
SQLite Programming
Chat & Messaging Software
Android
$45 hourly
Siarhei V.
- 0.0/5
- (2 jobs)
• Experience: 9+ 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/S, REST, WebSocket • JSON, XML, XPath, XSLT, HTML, RegExp • UML (PlantUML) Android Tools & Libraries • Android SDK, AndroidX/AppCompat, Android KTX • Custom View/ViewGroup, Jetpack Compose • View Animation API, Object Animator API • ButterKnife, Jetpack Data/View Binding • Material Design 2/3, Play Billing • Biometric API, Location API, Google Maps API • Light/Dark mode (DayNight theme), Dynamic Color (Material You) • Phone/Tablet UI (master-detail UI) • SQLite, SQLCipher, Realm, DBFlow, Room (DB ORM) • Dagger2, Hilt (DI frameworks) • OkHttp, Retrofit, Gson (HTTP/S networking) • EventBus, RxJava2, Kotlin Coroutines, Flow (async programming) • Picasso, Glide (image loading) • 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, VS 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

Kotlin
Android Tablet
JetBrains IntelliJ IDEA
Mobile App Development
Mobile App Bug Fix
Firebase
Android SDK
Android App Development
Android
Android Studio
Java
$30 hourly
Umair H.
- 4.8/5
- (4 jobs)
As a Top Rated Plus software engineer on Upwork with over 7 years of experience and 2K+ hours logged, I am dedicated to delivering high-quality, cutting-edge solutions for clients in the software industry. I specialize in full-stack web development, proficient in backend technologies like .NET Core, Spring Boot, and NodeJS, and frontend frameworks such as Angular and ReactJS. My expertise spans multiple databases, including SQL Server, MySQL, PostgreSQL, Oracle, MongoDB, and RavenDB. Skilled in testing and automation, I use xUnit, NUnit, MSTest, JUnit, Mocha, Cypress, and Silicon to ensure robust code. I’m fluent in English, and committed to building strong, long-term client relationships while consistently achieving high satisfaction. Let’s work together to bring your project to life!

Kotlin
C++
Web Design
ASP.NET MVC
Azure App Service
.NET Core
API Integration
ASP.NET Web API
Angular
Azure DevOps
React
$25 hourly
Mikolaj G.
- 5.0/5
- (3 jobs)
Fullstack Web & Mobile App Developer | JavaScript/TypeScript | NextJS | React.js | Node.js | MongoDB | MySQL | HTML/CSS | Tailwind | React Native | Expo | Lynx | Kotlin | Django | Vue Hello there! I'm Mikołaj, a dedicated Fullstack Web & Mobile App Developer with over 4 years of hands-on experience in building websites, servers, progressive web applications, and mobile apps. I specialize in crafting seamless, efficient, and user-friendly experiences across both web and mobile platforms. Skills: Frontend Development: Proficient in building responsive and interactive user interfaces using modern technologies such as React.js, JavaScript, TypeScript, HTML5, and CSS3. Backend Development: Skilled in creating robust server-side applications using Node.js and Express.js, ensuring seamless data flow and efficient API integrations. Database Management: Experienced in working with both relational databases like MySQL and NoSQL databases like MongoDB. Able to design efficient database structures and optimize queries for improved performance. Fullstack Proficiency: Adept at bridging the gap between frontend and backend, resulting in cohesive, end-to-end application development and smooth user experiences. Mobile App Development: Expertise in building mobile applications using React Native, Expo, Lynx, and Kotlin. Capable of creating seamless cross-platform apps with smooth performance and robust functionality for both iOS and Android devices. Professional Highlights: Developed and launched multiple web applications and mobile apps from concept to deployment, focusing on user experience and functionality. Collaborated with cross-functional teams to deliver high-quality projects within set deadlines, ensuring effective communication throughout the development lifecycle. Implemented RESTful APIs to facilitate seamless data exchange between frontend and backend, enhancing application responsiveness. Created dynamic and interactive frontend components using React.js, improving user engagement and overall satisfaction. Designed and maintained databases, optimizing queries and ensuring data integrity for scalable applications. Developed mobile applications using React Native and Expo, delivering fast, responsive apps for iOS and Android, as well as working with Kotlin and Lynx for native development. Actively kept up-to-date with industry trends and emerging technologies, integrating best practices into development processes to enhance application performance and security. Why Choose Me: I'm passionate about crafting clean, efficient, and user-friendly web and mobile applications that meet clients' needs and exceed their expectations. With a solid foundation in both frontend and backend technologies, as well as mobile development, I offer end-to-end solutions that deliver value and drive results across web and mobile platforms. Let's collaborate to turn your ideas into reality! Feel free to reach out to discuss your project ideas, tech challenges, or any exciting opportunities. I'm eager to contribute my expertise to your next big project. Looking forward to working together!

Kotlin
Next.js
Vue.js
Django
Native App
Mobile App
React Native
ExpressJS
MongoDB
MySQL
React
TypeScript
NestJS
Node.js
JavaScript
$35 hourly
Mikhail Y.
- 4.2/5
- (5 jobs)
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

Kotlin
Android
iOS
CI/CD
Swift
MERN Stack
Mobile App Development
Web Development
React
AJAX
WordPress
CSS 3
HTML5
Landing Page
$30 hourly
Nisar A.
- 5.0/5
- (0 jobs)
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

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
$50 hourly
Artem L.
- 0.0/5
- (0 jobs)
Hi, my name is Artem. I'm a Senior Android Developer with almost 6 years of commercial experience. I specialize in creating highly maintainable native applications for Android using the following stack: - Kotlin + Coroutines - Modularization (based on the requirements) - Clean Architecture - MVVM - Hilt / Koin - Retrofit (or Ktor Client on request) - Kotlin Serialization (or GSON / Moshi on request) - Jetpack Compose - Material Design (if no design provided) - Paging 3 - Room (caching) - Unit Tests - UI Tests - GitHub Actions (CI/CD) Additionally I can create PoC backend apps in Kotlin using Ktor if needed.

Kotlin
CI/CD
RESTful API
Clean Architecture
Unit Testing
Google Play
Material Design
Android SDK
GitHub
Android
GraphQL
Firebase
Android App Development
$40 hourly
Alexandr B.
- 0.0/5
- (0 jobs)
SUMMARY * 9+ years of experience in the IT industry with a good understanding of software development practices and methodologies. * Deep knowledge of design patterns and object oriented concepts. * Experience in developing server side components using JPA, Hibernate, Spring as well as UI using AngularJS and jQuery . * Expertise in different types of databases including relational and document . * Strong competencies in data structures and algorithms. * Experience of working in an agile environment, scrum, continuous integration, continuous delivery. * Good analytical, problem-solving and communication skills and proven ability to rapidly acquire knowledge on new technologies and implement them in software projects.

Kotlin
Reactive Programming
Multithreaded, Parallel, & Distributed Programming Language
ELK Stack
RabbitMQ
MySQL
Gradle
MongoDB
Redis
Spring Security
Docker
Java
NGINX
Spring Boot
Spring Data
$16 hourly
Yehor P.
- 5.0/5
- (13 jobs)
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.

Kotlin
Automation
Scripting
Data Scraping
AWS Application
Oracle
AWS Amplify
Docker
RESTful Architecture
Java
Golang
RESTful API
MySQL
Spring Framework
Redis
$25 hourly
Maksym K.
- 5.0/5
- (1 job)
🚀 Need a mobile app that just works — fast, scalable, and stable? I help founders and companies bring ideas to life with Flutter, React Native, and native Swift/Kotlin. Whether it’s launching an MVP, scaling an existing app, or integrating advanced features — I’ll handle the mobile part so you can focus on growth. Hey! I’m Max — a mobile developer who builds apps with care, clarity, and consistency. I help founders and teams bring their ideas to life — with Flutter/React Native, native Swift/Kotlin, and reliable backend support in NestJS. ✨ Clean architecture, offline-first sync, Firebase/AWS, real-time features — built, tested, and loved by users. 💬 My clients stay because they feel heard, understood, and supported throughout the process. I don’t just write code — I take ownership. I treat your product like my own: with full attention, thoughtful decisions, and clear communication. 🤝 With me, you get more than a developer — you get a partner who cares about your vision and your users. Let’s build something reliable, beautiful, and truly useful. 🚀

Kotlin
React Native
Fastlane
CI/CD
Clean Architecture
SwiftUI
Swift
Git
JavaScript
iOS
Node.js
Firebase
Mobile App Development
Dart
Flutter
$45 hourly
Eugene D.
- 0.0/5
- (1 job)
👋 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)

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
$50 hourly
Aron O.
- 0.0/5
- (0 jobs)
I have been creating applications for Android and iOS for 6 years in native Android and Flutter.

Kotlin
Dart
React Native
Flutter
Android
JavaScript
React
Java
$27 hourly
Taras T.
- 4.7/5
- (2 jobs)
👋 Hey! I'm Taras - Senior Full-stack Developer with more than 10+ years of deep knowledge and commercial experience in mobile development, technical consulting, and project management. Here are some of my top achievements: ⭐️ My clients made $15M+ with apps I developed ⭐️ 10+ years of commercial experience ⭐️ 70% of client return rate ⭐️ Over 40 projects completed and launched ⭐️ Saved $500K+ to clients by selecting a cost-effective stack for development ⭐️ 10M+ active users across developed products ⭐️ 4.5 average rating of products in App Store & Google Play Why work with me? ✅ 𝟏𝟎𝟎% 𝐆𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞𝐝 𝐪𝐮𝐚𝐥𝐢𝐭𝐲 𝐝𝐞𝐥𝐢𝐯𝐞𝐫𝐲 𝐨𝐫 𝐲𝐨𝐮𝐫 𝐦𝐨𝐧𝐞𝐲 𝐛𝐚𝐜𝐤 ✅ Cost-effective development approach ✅ Business and product approach to your project ✅ 3 months of FREE maintenance We take care of the full development cycle - from product analysis to delivery to the market, so you can concentrate on your business growth! Industries we serve: 🔸Healthcare & Fitness 🔸Social Networks 🔸Food & Restuarants 🔸 Retail & E-commerce 🔸On-demand solutions 🔸 Logistics & Distribution 🔸 Real Estate 🔸 Travel & Hospitality 🔸 E-learning 🔸Blockchain & NFT Technologies I use in my projects: *️⃣ Mobile Apps: Swift, Kotlin, React Native, Flutter *️⃣ Web Apps: React, Angular, JavaScript *️⃣ API development: Node.js, PHP, Laravel, Python, C#, .NET *️⃣ E-commerce development: Shopify, Magento, Woocommerce *️⃣ Blockchain development: Solidity, Ether.js, Hardhat, Truffle, Rust *️⃣ Design: Figma *️⃣ Cloud Services: AWS, Google Cloud, Firebase, Our first call? Expect an in-depth Zoom discussion about your project, followed by a comprehensive plan based on your needs. If we're a good fit, let's move forward. If not, I can provide advice and referrals to ensure your project's success. General process: 1️⃣ Discovery call: Understanding your needs through a face-to-face Zoom call. 2️⃣ Discovery document: Outlining your project requirements. 3️⃣ Design phase: Based on specific needs, this could involve a professional designer or a basic concept. 4️⃣ Back-end development: Creating APIs, documenting processes. 5️⃣ Development cycles: Regular updates and feedback sessions. 6️⃣ Deployment: A carefully staged and executed process. 7️⃣ Continuous support: 3 months of FREE maintenance, so if any bugs & errors appear I will fix them without any extra charges.

Kotlin
Django
Web Development
Web Application Development
Firebase
Amazon Web Services
JavaScript
PHP
Node.js
Swift
Flutter
React Native
Python
React
Mobile App Development
$14 hourly
Jan R.
- 5.0/5
- (1 job)
I am fourth year Computer Science student, fullstack developer and musician, combining programming and creativity to create complex digital experiences.

Kotlin
Docker Compose
Docker
Android
JetPack
Git
Tailwind CSS
Spring Boot
Java
Angular
React Native
React
App Development
Web Development
Web Application
$48 hourly
Tom H.
- 0.0/5
- (0 jobs)
I'm a seasoned Senior Flutter Developer with over 5 years of experience in designing, developing, and leading cross-platform mobile and web projects for international clients. I specialize in building scalable, production-ready applications using Flutter, Dart, and modern web technologies. My expertise covers mobile, web, and desktop (Flutter Desktop), including advanced integrations (Firebase, GraphQL, payment gateways, analytics, AI modules). I have a proven track record of leading teams, managing full project cycles, and collaborating directly with clients, business stakeholders, and investors. I deliver high-quality, maintainable code with a strong focus on UI/UX, performance, and seamless cross-platform user experience. Let’s work together to turn your ideas into successful digital products! Key Skills: Flutter (Mobile, Web, Desktop) Dart Android & iOS native integrations Firebase GraphQL REST API JS/TypeScript React Git BLoC CI/CD Team Management AppStore & PlayStore deployment Blockchain integrations Technical leadership

Kotlin
JavaScript
TypeScript
CI/CD
GraphQL
REST API
Firebase
React
iOS
Android
Flutter
Want to browse more freelancers?
Sign up