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4.8/5
based on 27,630 client reviews
  • $50 hourly
    • 5.0/5
    • (10 jobs)
    Creative back-end developer dedicated to building elegant solutions that meet business demands. Over 15 years of experience developing software of different scales ranging from small startups to large enterprise applications. Implemented back-end as well as front-end with the main focus on the former. Good communication skills proven through work experience in distributed team projects. 𝗕𝗮𝗰𝗸-𝗘𝗻𝗱 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀: Java, Kotlin JavaEE, Spring, Guice JDBC, JPA, Hibernate JUnit, Mockito, Cucumber, FitNesse Maven, Ant Git, SVN Jenkins, Sonar TypeScript, JavaScript Node.js Jest Webpack 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀: MySQL, MariaDB, Oracle MongoDB, AWS DynamoDB 𝗖𝗹𝗼𝘂𝗱 𝗣𝗿𝗼𝘃𝗶𝗱𝗲𝗿𝘀: Amazon Web Services 𝗦𝗲𝗮𝗿𝗰𝗵 𝗘𝗻𝗴𝗶𝗻𝗲𝘀: Solr, Elasticsearch 𝗙𝗿𝗼𝗻𝘁-𝗘𝗻𝗱 𝘁𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀: Vue HTML, CSS, Bootstrap Should you need any further information, please do not hesitate to contact me.
    Featured Skill Java Python Developers
    Reactive Programming
    Docker
    Kubernetes
    CI/CD
    Terraform
    Distributed Computing
    Node.js
    Microservice
    Amazon Web Services
    Spring Framework
    TypeScript
    Java
    JavaScript
    SQL
    MongoDB
  • $50 hourly
    • 5.0/5
    • (58 jobs)
    Native Android Developer | Java & Kotlin 🚀 Top Rated Plus 💯 100% Job Success Score 8+ years of experience working on native Android applications for high profile clients and businesses. I've strong Java/Kotlin programming skills including low-level performance optimizations and memory management. ✔ Ml-kit, OpenCv, TensorFlow, Camera, Image Processing ✔ Clean Architecture, MVVM, Firebase, Coroutines, Live data, DataBinding, Dagger2/Hilt, Room, Retrofit, Glide, Payments 🚀 Why Choose Me? 8+ Years of Servicing High-Profile Clients Strong Java/Kotlin Programming Skills Developer with a Keen Eye on Technological Advancements Detail-Oriented and Timely Deliveries
    Featured Skill Java Python Developers
    Android App
    Android Studio
    Native App Development
    Firebase
    Java
    Android App Development
    Kotlin
    Android
    Mobile App Development
    SQLite
    Camera Operation
    NFC
    Mobile App
    Android SDK
    OpenCV
  • $20 hourly
    • 4.9/5
    • (52 jobs)
    🌟 Top-Rated Upwork Professional 🧑🏻‍💻 10+ years of experience 📱 Android | Kotlin | Java | Jetpack Compose | Kotlin-Multiplatform| Flutter | WearOS | AndroidTV | 🚀 AI | ChatGPT | 💻 Firebase | VoIP | Linphone With over 10 years of extensive experience as an Android Developer, I specialize in native Android application programming with a strong focus on SCRUM/Agile workflow. 
 
I have a proven track record of delivering high-quality mobile applications in various domains, including:
 * Airline Domain * Banking Domain * Cargo Management Domain * Logistics Domain * Financial Domain * Social Media/Dating Domain with Video/Audio Chats * Location Tracking Domain
 My expertise in mobile development includes:
 * Programming Languages: Java, Kotlin * Architectural Patterns: MVVM, MVP, MVC * Design Patterns, Custom Controls, and REST API integration * Material Design, Mobile UI/UX, and Firebase integration (AdMob, Analytics, A/B testing, etc.) * Jetpack Compose, Jetpack Navigation * Firebase Realtime Database and Storage * Android SDK, NDK, Open Source, Support Libraries * Reactive Programming with rxJava and rxAndroid * Dependency Injection using Dagger, Kodein, and Hilt * Databases: SQLite, Room, Realm, Page * Network Libraries: Retrofit, OkHttp, Volley, ktor * Image Loading Libraries: Picasso, Glide * Crash Reporting and Analytics Tools: Crashlytics, Firebase, Fabric, LeakCanary, Timber * Other Libraries: Gson, AutoValue, JodaTime, AndroidJob, Google Services * Sockets/SignalR * Kiosk Mode * SonarQube code coverage * Kotlin-Multiplatform (One POC)
 * Wear OS & Smartwatch development * Mqtt In addition, I am an expert in the Linphone SDK, a powerful tool for building voice and video communication applications. I have in-depth knowledge of integrating and customising the Linphone SDK to create high-quality, real-time voice and video chat functionalities within Android applications. I am experienced in implementing Linphone's advanced features, including call management, audio/video codecs, encryption, push notifications, and more. Whether you need to develop a VoIP application from scratch or enhance an existing app with Linphone capabilities, I can provide the expertise you require.
 I have integrated various features and technologies into Android applications, including:
 * Beacons integration for proximity-based interactions * Calendar API integration for managing events and schedules * QR Code integration for scanning and processing QR codes * OCR (Optical Character Recognition) integration for text recognition and extraction
 For multimedia capabilities, I have integrated Video Chat using WebRTC, ZegoClould, Twilio, and Agora, as well as Audio Streaming. I am familiar with ExoPlayer for HLS Video Streaming (HTTP Video Streaming), RTSP Video Streaming, and DASH Video Streaming.
 Other skills and features I offer include Custom Calendar development, Media Gallery implementation, Background Download and Upload functionality, Tiff file format handling in Android, Live Streaming using Agora and ZegoCloud SDK, Deep Linking, LeakCanary for memory leak detection, and code annotations to improve the linting process.
 Experienced Kotlin Multiplatform Developer with a track record of delivering efficient cross-platform solutions. Proficient in Kotlin Multiplatform Mobile (KMM) and skilled in creating high-performance apps for Android, iOS, web, and more. Experienced Jetpack Compose Developer, proficient in creating dynamic, interactive, and modern Android UIs. Skilled in leveraging Jetpack Compose's power to build visually stunning and responsive applications. Over the years, I have developed many different types of iPhone and Android apps. These include: - Food delivery apps - On-demand apps - Home services apps - Handy man apps - Salon apps - Beauty apps - Taxi apps - Ride apps - E-commerce apps - Dating apps - Health and fitness apps - Travel apps - Video streaming apps - Fintech apps - Shopping apps - Telemedicine apps - Finance apps - Real estate apps - Social media apps - Chat apps - Business apps - Messaging apps - Online courses apps - Online education learning apps - Tutor apps - Hotel booking apps - Online grocery order apps - Telecommunication apps - VoIP apps - SIP Apps - Apps using the Twilio API I am fluent in English and passionate about Android development. Please feel free to reach out to me with any Android-related questions or projects. I would be pleased to help you bring your ideas to life.
    Featured Skill Java Python Developers
    Mobile Device Management Software
    AOSP
    Java
    Smartphone
    iOS Development
    User Authentication
    Android
    JetPack
    Mobile App Development
    Wear OS
    In-App Purchases
    VoIP
    Firebase
    Android App Development
    Kotlin
  • $39 hourly
    • 4.9/5
    • (78 jobs)
    I’m a team leader of the team of java full stack developers capable of solving tasks of any complexity at every stage of the software development life cycle, from analyzing requirements and building architectures for startups to supporting and changing legacy projects. We specialize in developing a backend for mobile (rest/soap) and enterprise web applications or specific tasks that are better implemented by those tools that are supported by the Java language. We also have sufficient expertise and experience to develop a UI in Angular or React. We work with various relational databases (MySql, Postgresql, Oracle) and NoSQL databases (Mongo, Cassandra, Redis). As the primary tool, we use the Spring Framework. However, we have experience working with others (Vert.x, Micronaut, etc.) We monitor the quality of our code using tools for unit testing, static code analysis, and continuous integration/delivery. Also, we continuously review the code for vulnerabilities and performance issues. We develop cloud solutions with automatic deployment both on Amazon AWS or other cloud providers and on the physical servers of the customer.
    Featured Skill Java Python Developers
    Architectural Design
    Performance Optimization
    Enterprise Software
    CI/CD
    Test-Driven Development
    DevOps
    Angular
    Cloud Computing
    Database Management
    Microservice
    REST API
    Spring Framework
    Micronaut
    PostgreSQL
    Java
  • $50 hourly
    • 5.0/5
    • (28 jobs)
    I’m a programmer with more than 10 years of experience who can work in different programming langauges using different frameworks. I can create any application type: ● web based ● desktop If I don’t know any programming language or framework which you want to use to build your application then I can learn it in couple days. SKILLS ● PHP ● Javascript ● jQuery ● Bootstrap ● AJAX ● MySQL/PostgreSQL ● REST API ● HTML/HTML5 ● CSS/CSS3 ● C/C++ ● Ruby (and framework Ruby On Rails) ● Python ● Java ● CUDA Computation ● OCR (on C/C++, Python, Java) EXPERINCE ● Freelance 5+ years (up to July 2014). I was working hard to learn what clients want to see, to learn different programming languages and frameworks. Those years taught me to learn new things everyday to provide high-quality solutions for my client. Here's some of my works (PHP, MySQL, HTML, CSS, JavaScript): ○ dev.louepartout.com ○ kilosolution.com ● Swiss Interactive Software GmbH (August 2014 - December 2014). Front-End and Back-End developer for gambling platform and websites (using the platform). Here's you can see some of the websites we built (PHP, MySQL, HTML, CSS, JavaScript, Bash): ○ betboro.com ○ sports.flutterclub.com ○ sports.princessstar.com ○ globalbet.eu ● Ad.net (February 2015 - Present).
    Featured Skill Java Python Developers
    HTML5
    CSS 3
    C++
    Java
    MySQL
    React
    Bot Development
    Automation
    Data Scraping
    Python
    PHP
    Data Extraction
    Web Crawling
    JavaScript
    Selenium
  • $45 hourly
    • 4.8/5
    • (116 jobs)
    Thanks for viewing my profile! I am a detailed and thorough professional with over 10+ years of extensive experience in Mobile application development. I specialize in delivering quality services with respect for strict deadlines. Both my experience and problem-solving skill made me an outstanding developer. I will apprehend your business requirements and will help you choose the right technology for your solution. Below are some of the domains and technologies I've worked on. 🎨 User Interface and User Experience Designing Figma, Invision Studio, Adobe XD, Adobe Illustrator, Adobe Photoshop, Sketch, Balsamiq, etc. 📱 Mobile Application Development (Native & Hybrid) Kotlin, Java, Swift, ObjectiveC, React Native, Flutter 📟 Augmented Reality (AR) Vuforia, ARKit, ARCore Let's meet and discuss how to convert your idea into reality using technology!
    Featured Skill Java Python Developers
    Graphic Design
    Dating Website
    Mobile UI Design
    Travel & Hospitality
    Health & Wellness
    Apple Xcode
    Mobile App Testing
    Kotlin
    Java
    Augmented Reality
    Android App Development
    Payment Functionality
    Swift
    iOS Development
  • $25 hourly
    • 5.0/5
    • (26 jobs)
    I have 12 years experience in software development. My technology stack are as follows: - VueJS/Next.js/React/React Native/Astro - TypeScript - NodeJS - PHP - Custom - Laravel - NestJS - TailwindCSS - Bootstrap - JQuery - Docker - CI/CD - Github Actions - Serverless - AWS Services - Server Management - Ubuntu & Windows - Shell/Bash Scripting (deployment automation) I am keen to details, and I work hard to provide beyond expectations. Let's work together.
    Featured Skill Java Python Developers
    Docker Compose
    AWS CloudFormation
    Amazon ECS
    AWS Lambda
    Next.js
    React
    CircleCI
    PHP
    Vue.js
    Laravel
    Amazon Web Services
    Java
    Docker
    JavaScript
    Node.js
  • $50 hourly
    • 4.9/5
    • (45 jobs)
    I'm an Oracle-certified Java expert with much experience in backend technologies, including but not limited to Spring Framework, JPA, MongoDB, etc. I'm also an AWS-certified and Kubernetes-certified DevOps engineer; hence, I can help if you need additional infrastructure resources. With 20,000+ hours of work on Upwork alone, I believe I can make a meaningful contribution to your project. As a side note, if you do a Google search with the keywords "spring bean", "spring boot interview questions", or "maven integration testing", you'll find my writings at the top spots.
    Featured Skill Java Python Developers
    Terraform
    Docker
    Web Service
    Hibernate
    RESTful API
    MySQL
    API
    Kubernetes
    Amazon Web Services
    Spring Framework
    Spring Boot
    Java
  • $40 hourly
    • 5.0/5
    • (18 jobs)
    ✅Top 3% rated. I immerse myself fully in comprehending your unique needs and absorbing your visionary ideas. Once this foundation is established, watch as I surpass your wildest expectations. ✅Bachelor Degree in Computer Science ✅5+ Years Experience in IT & Software Engineering ✅30+ software projects I provide: 🟩Responsive Web Applications & From Scrach SAAS Products 🟩API development & Integration (OpenAI Whisper, GPT3 ...) 🟩Chatbots & Virtual Voice Assitants My areas of expertise include (mostly nextjs reactjs web development ): 🟢Next.js / React.js (Javascript & Typescript) 🟢Strapi CMS 🟢Node.js 🟢Postrgre SQL 🟢Chakra UI 🟢Tailwind CSS 🟢Python Flask 🟢OpenAI 🟢WebSockets & WebRTC 🟢MUI Let's collaborate and take your business to new heights. I am open to offers and eager to help you achieve remarkable success.
    Featured Skill Java Python Developers
    Responsive Design
    Tailwind CSS
    PostgreSQL
    CMS Development
    Full-Stack Development
    Node.js
    JavaScript
    MySQL
    TypeScript
    Web Development
    React
    Next.js
    Strapi
  • $35 hourly
    • 5.0/5
    • (2 jobs)
    I'm a developer with 5+ years of experience in Android native development. There are a lot of different applications in my portfolio: messengers, maps, e-commerce, media, IoT clients, business clients, and even games. Many of them work great and carry out their tasks, some of them have become one of the best in their field with hundreds of thousands of pleased active users. I experienced: - Android SDK - Java, Kotlin - Realm, SQLite, Room - Firebase - Dagger 2, Koin - RxJava 1, 2; Coroutines, Flow - OkHTTP, Retrofit, Smack (XMPP) - MVC, MVP, MVVM, MVI - Compose - Clean Architecture, SOLID, GoF, UDF, KISS, DRY и др - AndroidJetpack: Live Data, ViewBinding, Livecycle, Navigation и др. - Git, Github, Gitlab, Bitbucket, Jira, Trello, Redmine, Linux, Crowdin, TravisCI, GitlabCI, Jenkins, Postman, and other instruments Contact me if you want to make your application great!
    Featured Skill Java Python Developers
    Kotlin
    Android
    Android SDK
    Realm Database
    Multithreaded Programming
    Java
    Material Design
    Android App Development
  • $56 hourly
    • 5.0/5
    • (18 jobs)
    I am working as Sr. Java Back-end Developer along with ReactJS experience with front-end. If you are finding someone passionate about reusable, clean code, secure applications and agile methodology follower, then you are viewing right profile!. I have 8+ years of experience in software industry with Java based technologies. I have been involved across all phases of project development life-cycle. I am expert at database design or create base architecture for J2EE web applications. I have hands on experience in the following areas: ➤ Core Java ➤ JavaEE ➤ Alfresco Development (v4.2+) ➤ Spring MVC, ZK (ZKoss) ➤ Spring Security ➤ Spring DATA/JPA/Hibernate ➤ MySQL (database design and complex query expert) ➤ JSP/JSTL ➤ Jasper-Reports/Dynamic Jasper Reports ➤ Twitter bootstrap ➤ Lucene/Solr ➤ Indexing/Searching ➤ Tomcat/JBOSS ➤ GIT/SVN/CVS/P4V(Perforce) ➤ Struts 2.0 ➤ JIRA/Agile Looking forward
    Featured Skill Java Python Developers
    Amazon Web Services
    Docker
    JavaScript
    React
    RESTful API
    Web Service
    MySQL Programming
    Jakarta Server Pages
    Spring Security
    AWS Lambda
    Amazon DynamoDB
    Spring Boot
    Spring Framework
    Java
  • $75 hourly
    • 4.9/5
    • (66 jobs)
    I am a professional software developer with 25 years of experience. I focus on mobile app development for Android and iOS, web development, and cloud services. Throughout my career I have gained experience in many different technologies, from modern cloud, mobile, and web development architectures all the way back to mainframe systems. My app development experience includes location services, map integration, user authentication and user profile management, payment functionality, media playback including both audio and video, and in-app purchases. I can work with many services available from Amazon Web Services (AWS) and Google Cloud Platform (GCP). I am committed to producing a quality product. I always stand behind my work and communicate as much as I can. The more my client and I both know about what is being done, the happier everyone is.
    Featured Skill Java Python Developers
    ChatGPT
    Google Cloud Platform
    User Profile Creation
    Location-Based Service
    Firebase
    Amazon Web Services
    Node.js
    Java
    Kotlin
    Swift
    iOS Development
    iOS
    Android App Development
    Android
    Mobile App Development
  • $40 hourly
    • 5.0/5
    • (21 jobs)
    With over 8 years of experience as an Oracle certified developer, I specialize in JavaFX desktop application development, boasting expert knowledge of the JavaFX framework. My forte lies in applying architectural patterns and adhering to best practices, resulting in the creation of clean, expandable code for your projects. I am passionate about delivering robust and user-friendly applications, always striving to guarantee client satisfaction. My dedication extends beyond technical expertise; I am also a proficient communicator and an effective team player, ensuring seamless collaboration on every project. In addition to my core skills, I am well-versed in essential development tools like Git, Maven, Gradle, Eclipse, IntelliJ IDEA, and JProfiler. This comprehensive skill set enables me to navigate your projects with precision and efficiency. Let's work together to transform your Java development goals into reality.
    Featured Skill Java Python Developers
    JetBrains IntelliJ IDEA
    Desktop Application
    JavaFX
    OpenGL
    MQTT
    User Interface Design
    Game Development
    SQL
    Git
    Java
  • $30 hourly
    • 5.0/5
    • (2 jobs)
    10+ Skills | 15+ Years experience in Engineering field Android, Java/Kotlin/Python/C/SQL, UI/UX, Git, GitHub/GitLab/Bitbucket, Android Studio/IntelliJ IDEA/Eclipse, Trello/GitLab board, SOLID Firebase, Bluetooth and much more - developing projects from scratch (setup, architecture, features development) - deveopment for embended devices - support legacy projects - integration of new technologies - working with Google guidelines I can just do any job for you, no matter how difficult the task you describe I do
    Featured Skill Java Python Developers
    Firebase
    Coroutine
    Retrofit
    Android Studio
    Java
    SQLite
    Kotlin
    Android App Development
    Mobile UI Design
  • $105 hourly
    • 4.7/5
    • (738 jobs)
    ** HubSpot Design Certified ** Recently recognized as a HubSpot Champion User Worked on many different types of applications and with many different technologies. Quickly learn new programming languages and technologies. Can also read and understand existing code to find and fix bugs. Have 26 years experience in IT. Have a Bachelors Degree in Math as well as an MBA. I have worked with many programming languages including COBOL, Visual Basic, C, C++ and Java. Currently working on projects utilizing Angular, JQuery, Java Script, CSS, HTML5, Hubspot and Flex. I am familiar with content management systems. I have worked on front end designs/pages and back end services. Have done responsive development, desktop applications, and mobile applications.
    Featured Skill Java Python Developers
    CSS
    HTML
    Content Management System
    HubSpot
    CMS Development
    Website Customization
    Agile Software Development
    Blog Development
    Inbound Marketing
    Templates
    Business with 100-999 Employees
    iOS Development
    Android App Development
    JavaScript
    Java
  • $30 hourly
    • 4.2/5
    • (27 jobs)
    Senior Software developer professional bringing more than 11 years in software design, development and integration. Offering advanced knowledge of Java and Javascript programming languages for web and mobile applications.
    Featured Skill Java Python Developers
    CI/CD
    React
    Node.js
    Three.js
    AWS Development
    Spring Framework
    Oracle PLSQL
    Jakarta Server Pages
    FFmpeg
    Android
    Python
    PHP
    JavaScript
    Java
    Docker
  • $45 hourly
    • 5.0/5
    • (77 jobs)
    Hi my name is Hirin, I am senior full-stack developer, I have been involved in programming since 2008. I have 13+ years professional experience with various programming language. I'm focused to web, server, and desktop app programming with latest tech and and very enthusiastic about creating super fast and efficient process by using multi-threading or concurrency. 👉Following are my main programming languages:👇 ✅ JAVA ✅ C# ✅ NodeJS ✅ PHP ✅ Html & JavaScript ✅ Dart ✅ Go Lang ✅ Python ✅ Asp. Net 👉Databases:👇 ✅ MySQL ✅ MSSQL ✅ PostgreSQL ✅ MongoDB ✅ Redis 👉Frameworks and Others:👇 ✅ Laravel / SPA ✅ VueJS ✅ Inertia ✅ ExpressJS ✅ Flutter ✅ Multi-threading Programming ✅ Socket/Websocket ✅ Data Scrapper (Html/Pdf) 👉APIs:👇 ✅Stripe ✅Google ✅AWS ✅Zoho ✅FeDex / UPS ✅Twilio ✅Gongio ✅ETC Programming is not just my job, but is part of my life because I really super love it. Don't hesitate to use my services to solve every your programming issues (creating from scratch, continue existing, or convert existing). Thank you for visiting my profile
    Featured Skill Java Python Developers
    Stripe
    Flutter
    NoSQL Database
    Database Programming
    Payment Gateway Integration
    Database Development
    JavaScript
    Java
    C#
    Node.js
    PHP
    .NET Framework
    Custom PHP
  • $100 hourly
    • 5.0/5
    • (30 jobs)
    Results-driven software engineer with over 20 years of experience designing, developing, and optimizing Java-based SaaS web applications, system architectures, and API-driven integrations. Adept at modernizing legacy systems, upgrading Java JDK versions, managing third-party dependencies, and implementing security and vulnerability mitigations. Proven expertise in troubleshooting and optimizing critical system functions, including JVM memory tuning, heap and thread dump analysis, and database performance tuning. Skilled in building scalable, high-performance applications by leveraging modern cloud infrastructure, CI/CD pipelines, and DevOps best practices. Passionate about solving complex technical challenges, improving system reliability, and enhancing application functionality and performance to drive business success. Technical Expertise: Backend Development: Java, Spring Boot, JPA, Hibernate, Tomcat, REST APIs, Maven Cloud & Infrastructure: AWS (EC2, S3, RDS, SQS, SES, QuickSight, Cognito, CodeDeploy, Lambda, Security Groups) Frontend Development: JavaScript, React, Angular, Material UI/MUI, jQuery, DataTables, HTML, CSS, Bootstrap Database Management: SQL (MySQL, SQL Server, Postgres), JDBC, Liquibase DevOps & Automation: CI/CD Pipelines, AWS CodeDeploy, BitBucket Pipelines, GitHub Actions, Docker, JIRA, Bamboo, Confluence
    Featured Skill Java Python Developers
    React
    Docker
    PostgreSQL
    Angular
    Microsoft SQL Server
    Amazon Web Services
    MySQL
    API
    JavaScript
    Java
    HTML
    Spring Framework
    Apache Tomcat
    Spring Boot
    Hibernate
  • $75 hourly
    • 4.2/5
    • (30 jobs)
    I'm an Android developer and consultant over 7 years experience. I have solid expertise in the bolts and nuts of modern android development and can competently handle complex projects. I have comprehensive experience in building apps from scratch, taking over existing unfinished projects and poorly built projects that are in need of swift bug fixing, performance optimizations, new featues, code refactoring and cleanup.
    Featured Skill Java Python Developers
    Android SDK
    Android App Development
    Android
    Clean Architecture
    Mobile App Development
    Git
    Google Play
    Unit Testing
    Firebase
    Xamarin
    Java
    Kotlin
  • $100 hourly
    • 5.0/5
    • (6 jobs)
    I am a software engineer with 20 years of experience in multiple industry. I am a very passionate and an excellent problem solver. I work with Java 11 using Spring, Elastic Search, Jersey, Hibernate, Postresql , Mysql and ActiveMQ. I also have a lot of experience in AWS services such as Cloudformation, DynamoDB, Lambda, SQS , RDS. I have the AWS developer associate certification.
    Featured Skill Java Python Developers
    PostgreSQL Programming
    Linux System Administration
    Apache ActiveMQ
    Amazon Elastic Beanstalk
    AWS Lambda
    Hibernate
    Java
    Oracle Database
    Docker
    RESTful API
  • $20 hourly
    • 5.0/5
    • (34 jobs)
    Flutter | Android | iOS | React Native | Kotlin MultiPlatform | Flutter UI | Flutter Development | Flutter BLoC | Flutter Provider | Flutter Hooks | Flutter Firebase Integration | Flutter Animations I am an enthusiastic developer with a strong programming background and possess excellent app development skills. I have developed a wide range of native and hybrid applications, satisfying all of my clients. With 10+ years of experience in mobile application development across various domains such as Fitness, Sports, Education, and Social, I specialize in delivering high-quality solutions. I hold a BS in Software Engineering from a reputable university and have participated in various competitions like Google Code Jam, HackerRank, and CodeFest to hone my skills. Apart from programming apps from scratch, I also provide maintenance services for your ongoing projects. SDK Integration Expertise: Amazon Web Services (AWS) Firebase Database and Analytics Stripe Gateway Braintree Twilio OpenTok MessageKit PubNub Sinch Facebook Twitter Google I believe in providing satisfactory and quality work to my clients to establish long-term relationships. Looking forward to working with you. Thanks for your time! Flutter Libraries & Tools that I used for writing flutter applications. - BLoC / Cubit - Provider - Riverpod - Flutter Hooks - Freezed - RxDart - GetX - Dio - Floor - Hive - Isar - Auto Route - get_it - Equatable - flutter_secure_storage - Shared Preferences - flutter_local_notifications - intl - Lottie - Firebase Messaging - json_serializable - flutter_native_splash - flutter_localization - path_provider - google_maps_flutter - flutter_svg - flutter_modular Note: Most of the in-progress jobs on my Upwork account are already completed and are awaiting client closure.
    Featured Skill Java Python Developers
    Android App
    Swift
    Kotlin
    Dart
    Hybrid App Development
    Flutter Stack
    FlutterFlow
    React Native
    Firebase
    Android App Development
    Gradle
    Flutter
    iOS Development
    Mobile App Development
    Java
  • $22 hourly
    • 5.0/5
    • (2 jobs)
    I have 4 years of experience in designing and developing mobile applications specialized in Flutter application development. I have very good experience working with Android application development such as IoT products, working with chatting-based applications, Calling based applications, Business charts-based applications, E-commerce base applications etc. I have proficiency in UL design and an understanding of the full mobile app development life cycle, I have very good knowledge of TDD development, Flutter, Kotlin, Dart, Node.js API, and Ionic. Excellent experience in giving life to client's imaginations by designing responsive, pixel-perfect, user-friendly, and modern mobile applications. If you want to understand my skills and code quality, let's hop on a call and discuss. I prefer to use Git as the control version system, Slack/Skype for communication, Redmine/Jira/Trello etc as project management and bug-tracking system. I have iOS and Android devices with needed screen sizes and versions for testing purposes. I am ready to discuss requirements and communicate with your team via video chat. Additionally, I can help you create technical and business requirements for the application if you don't fully understand which features you want. I tend to keep myself up to date with significant changes in the Android world and regularly look into new ways of solving things. If we work together you'll get a daily update of work, Weekly progress reports, Friday team meetings, and Sharing the progress at each stage of the development with you.
    Featured Skill Java Python Developers
    Mobile App Design
    API
    Android App
    Mobile App
    iOS SDK
    Android SDK
    Mobile App Improvement
    Mobile App Bug Fix
    Mobile App Development Consultation
    API Integration
    Java
    Flutter
    Dart
    Kotlin
    Mobile App Development
  • $45 hourly
    • 5.0/5
    • (60 jobs)
    With over 9 years of experience as a Mobile Developer, I bring to each project: ✓ Steadfast Commitment to Quality: Upholding the principle that excellence is the only standard, I approach every project with meticulous care and precision, ensuring outcomes that are not just completed, but masterfully executed. ✓ Passion for New Technologies: My enthusiasm for innovation drives me to continuously explore and integrate the latest trends and advancements in mobile development, keeping my solutions at the forefront of technology. ✓ Holistic Approach: Balancing innovation with reliability, I deliver projects that exceed client expectations, merging cutting-edge technology with dependable performance to create impactful solutions. ✓ Drive for Challenges: The dynamic and ever-evolving landscape of mobile development fuels my pursuit of new challenges and opportunities. Leveraging my extensive skills, I strive to make a significant difference in the mobile technology sphere, pushing boundaries and contributing to projects that set new benchmarks.
    Featured Skill Java Python Developers
    Android UI Design
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  • $48 hourly
    • 4.2/5
    • (11 jobs)
    I started in mobile development before the invention of the iPhone in a mom-and-pop games company creating the first multiplayer cellphone games for Qualcomm's BREW platform in C and C++. Since then, I've done freelance and speculative work in many languages, especially Java and Kotlin, and created a few apps which can be seen on my app store page, demonstrating the use of Amazon Web Services S3, Lambda, and Cognito integration; TextToSpeech and SoundPool/MediaPlayer resources; and a custom and user-customizable InputMethodService (built-in keyboard), among other things. (See my Google Play store linked below.) I'm seeking jobs to make use of and expand my experience in Kotlin, Android, and AWS and to this purpose I am happy to dive into existing code to solve bugs and insert new functionality, in addition to from-scratch development. Recent and Current Projects: IoT Bluetooth Display and Relay - Android App in Kotlin for phone/tablet and wearable Real-time control, calibration, processing, display, relay, and recording/playback of multiple remote sensors of various types in custom groupings and sessions. Maintaining bluetooth connection through out-of-range and device interruptions. WeeGee - Android App in Kotlin, Amazon Polly, under development Experimental alternative communication system in which touch interaction over custom dynamic menus builds strings of phonemes spoken aloud by the device's text-to-speech engine or Amazon's Polly service. DecodeTheNews - Android App in Kotlin, Amazon S3 and Lambda, released in October 2018 Challenging cryptogram game presenting current or historical headlines rather than quotes and a sophisticated interface. ImageKeyboard - Android App with InputMethodService, released February 2019 For users of icon-based alternative or augmentative communication, this app converts a directory tree of named images into a paged keyboard that can be set to replace the native Android keyboard in any text-input context. Insert and delete whole words, making text editing easier. Customizable preferences include grid size, highlight, trail, and other feedback behavior, touch sensitivity, and page navigation options. Retains several custom keyboards for easy context-swapping. GridMaker - Javascript Chrome App/Electron, under development as an Android module In support of the ImageKeyboard app, this program automatically parses icon grid images into a directories of named icon images, using OCR where possible. ChooseBook - Android App with Amazon S3, released in June 2018 Choose-your-own-adventure style ebook reader for young kids with zoom-and-pannable pictures, text-to-speech reader, and links between pages for easy navigation. A Javascript web page helps organize text, pagelinks, and images for each book in JSON files stored in Amazon S3. The app can browse available titles and download selected books, to view immediately or store on device for offline use. DecodeTheNews - Web Game, released 2015 Javascript/PHP application which finds and encrypts current headlines, storing them along with letter frequencies, a list of unique words, and other statistics for use by the cryptogram-style game. Visual tools in the game, including a pattern-matching dictionary, help players solve the cryptogram. A timer and leaderboard add suspense. Users can create an account or track their game history through a unique ID based on ip and computer configuration. Past Projects: RylaCampbell.com - Wordpress site with custom photo gallery with thumbnail navigation Songtunnel.com - PHP/MySQL Web Page, released 2007 A lyrics search site which grabbed and indexed song lyrics from other websites and enabled an advanced text/artist/album search. Matching songs are sorted by relevance with title, artist, album, year, and lyric snippet, as well as links to the Amazon media sample and "Buy now" referral link if available. Multiplayer Snake - C++/BREW Mobile app with Java, released 2005 The first true live-action multiplayer game on this platform. Developed to show off Entelepon's seamless networking layer. In offline and low-population games, non-player-controlled snakes using path-finding and goal-balancing algorithms fill in for other players with different levels of difficulty. Multiplayer Tank - C++/BREW Mobile app with Java, released 2004 The first turn-based multiplayer game on this platform where both player's actions were graphically represented in real time on the game-board. First use of Entelepon's UDP messaging layer. Offline play was available, against an AI using path-finding and cost/benefit strategies to simulate an intelligent opponent. Players could be matched at random or from a group of users within a custom "channel". Pre-coded taunts added a bit of social interaction. Dozens of game maps and random tank-fleet configurations made each game unique.
    Featured Skill Java Python Developers
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  • $25 hourly
    • 5.0/5
    • (31 jobs)
    I'm not just a coder; I'm a software craftsman dedicated to creating reusable, testable, and easily maintainable apps that minimize operational costs and serve my client's long-term business goals. My commitment extends beyond project delivery; I offer ongoing support, documentation, and assistance, ensuring smooth operations and easy adaptability in the future. My client-centric approach sets me apart in the freelance market, fostering trust and long-term relationships. I feel very flexible working within a team or independently using agile/scrum methodologies. I will be very happy to discuss the possible next big projects with you for maximizing your business. Here's what my client say about me, "Sharifur is an amazing developer. We worked with him for many tasks and I would love to work with him again. He's always available and cares more about the work than about the pay, a very rare find. If you need an amazing developer who cares about your product and who's always there when you need him, then he's the perfect hire!" - Liesbeth Christiane Sohier CEO at Readyfreddy Ltd. WHEN done right, a well developed android app can provide your customers an immense happiness while consuming your product and services. However, developing and maintaining a solid android app is a bit of a risky venture! There are procedural risks, technical risks, and risks in hiring the right person or team. Some risks are downright unavoidable. That's where I come in, let me explain why? ✔ Ensure highest quality codebase with high performant pixel perfect user interface that really converts. ✔ Deliver testable, independent codebase by following SOLID, OOP principles with MVVM, MVI clean architecture which includes latest Google tools and technologies. ✔ Monitor your project status which includes daily reports, bug reports, and project design artifacts. Clients can access Git source code repository from any corner in the world. Clients can download and install the latest version of the app onto their Android device anytime. ✔ Code review, peer-review, refactoring legacy code, code architecture improvement suggestions, fixing code smells until client fully satisfied. ✔ Problem solver, competitive programmer, top rated StackOverflow profile with 18K+ reputation & have a Bachelor degree in Software Engineering 😊
    Featured Skill Java Python Developers
    Google Maps API
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  • $50 hourly
    • 5.0/5
    • (1 job)
    Hi! I'm I am a professional software developer with 12+ years of hands-on experience. Experience in: • Development of complex service side solutions; • Code refactoring and optimization; • Integration with 3rd party systems; • Requirements definition and analyzing architecture discussions and proposals; • Tasks decomposition and control of their implementation; Roles • Tech Lead • Service side developer • Features key developer • Service side mentor Responsibilities • Implementing of back-end services • Code review and refactoring • Mentoring newcomers • Supervising & team coordination • Working with customers to establish requirements and determine proper priorities/estimates. Strengths: • Work in unfamiliar areas; • Consistency to deliver product in time • Team leadership; • Responsible; • Focused on customer success and concerns; • Good communication and problem-solving skills; Technical experience: - Primary programming languages: Java (8, 11, 17) - Other programming languages: Python, Scala, Kotlin, Groovy, JavaScript - Microservices: Spring Boot, Spring WebFlux, Quarkus, Docker, Hibernate, Netflix Condustor, Spring Security, Kafka, RabbitMQ, REST/gRPC/HTTP2 - ETL: Apache Airflow, Azkaban, AWS Step Functions - DB: MySQL, PostgreSQL, Neo4j, GraphDB, Redis, Vertica, Solr - Cloud: AWS - Monitoring and metrics: Datadog, Prometheus, Grafana, FileBeat, Jaeger - Testing frameworks: Junit, Mockito, PowerMock, Gatling, Cucumber (BDD)
    Featured Skill Java Python Developers
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  • $50 hourly
    • 5.0/5
    • (22 jobs)
    Hello, I'm a java developer with 13+ years experience. I'm searching for long term web application projects based on Java. I'm always open to learning new technologies. Stack of technologies: Language: Java Technologies and Frameworks: Spring-Framework, Spring-boot, Spring-security, REST Services. Database Access: JDBC, JPA/Hibernate, Querydsl Databases: PostgreSQL, MySQL, Oracle, MS SQL. Unit Testing Tools: JUnit, TestNG, Mockito Reporting Tools: JasperReport, iText Version Control Systems: Git, SVN Project management & Building tool: Maven, Gradle, Ant Other Stuff: Microservices, Docker Bug tracking: JIRA, Redmine, Trello
    Featured Skill Java Python Developers
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