Krystian Wsul, Developer in Málaga, Spain
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Krystian Wsul

Verified Expert  in Engineering

Mobile App Development Developer

Location
Málaga, Spain
Toptal Member Since
March 3, 2020

Krystian是一位专注于Android开发的全能程序员. He offers comprehensive Android development services. Krystian可以将项目从最初的想法带到Google Play Store，并处理长期维护和未来发展.

Full-stackMobile App DevelopmentGPSVisual StudioAndroid StudioAndroidJavaReactive ProgrammingModel View ViewModel (MVVM)KotlinAdMobSQLASP.NETC#MySQLYelp APIBranch.ioGoogle App Engine

Portfolio

Mobile Motion
SQL、移动应用开发、Firebase、Scrum、持续集成(CI)...
Freelance Work
Video Streaming, Mobile App Development, Video & Audio Processing, GraphQL, SQL...
MaxiPizza
Mobile App Development, SQL, Swift, Full-stack, Flutter...

Experience

Mobile App Development - 5 yearsAndroid Studio - 5 yearsMaterial Design - 5 yearsAndroid - 5 yearsJava - 5 yearsFirebase - 4 yearsGoogle Cloud Platform (GCP) - 4 yearsKotlin - 3 years

Availability

Full-time

Preferred Environment

IntelliJ IDEA, Android Studio

The most amazing...

...我所开发的是一个社交视频应用，它正在成长为市场的领导者之一.

Work Experience

Android Engineer

2020 - 2021
Mobile Motion
  • 在下载量超过1亿的社交视频应用中引入了新功能.
  • 开发了先进的视频编辑功能，如过滤器和视频剪辑合成.
  • Helped transition Java MVP architecture to Kotlin MVI.
  • Participated in a well-organized and mature Scrum process.
Technologies: SQL、移动应用开发、Firebase、Scrum、持续集成(CI), Video Streaming, Video & Audio Processing, Reactive Programming, Model View Intent (MVI), Model View Presenter (MVP), Google APIs, Room, Dagger 2, GraphQL, RxJava 2, Kotlin, Java, Android, Android Studio

Freelance Full-stack Android Developer

2017 - 2020
Freelance Work
  • 担任一款白色标签汽车共享应用的首席Android开发者，该应用在欧洲和亚洲拥有数十万的安装量.
  • 作为Android平台的开发者，为本地企业提供快速送货上门服务.
  • 为一个应用程序开发MVP，允许用户查看营销内容以收集积分, 然后将其用于合作企业的应用程序中的无广告使用.
  • 为网站分享社交和基于视频的智能手机评论开发了一个Android应用程序.
  • Developed an app for users inexperienced with social media, 这便于朋友和家人在生日时交换祝福, anniversaries, and other life events.
  • 为一家安全承包商开发了一款Android应用程序，简化了为员工撰写协作安全评估报告的流程, annotating them with editable images, videos, and maps; as well as geospatial information.
  • 构建MVP Android应用程序和基于web的管理工具的平台，促进购买, selling, and exchanging clothing items.
  • 设计了一款安卓应用，可以让用户协调晚宴的菜单.
Technologies: Video Streaming, Mobile App Development, Video & Audio Processing, GraphQL, SQL, Continuous Integration (CI), Full-stack, Model View ViewModel (MVVM), Model View Intent (MVI), Model View Presenter (MVP), Dagger 2, Accelerometers, Cloud Firestore, JWPlayer, OpenStreetMap API, WhatsApp API, Branch.io, Mapbox SDK, Near-field Communication (NFC), Reactive Programming, GPS, Realm, Google Location API, Google APIs, Material Design, Firebase Realtime Database, RxJava 2, Android Studio, Bluetooth, Yelp API, Facebook API, Test-driven Development (TDD), Google Drive API, Google Maps SDK, Google App Engine, SQLite, AdMob, Google Cloud Platform (GCP), Firebase, Node.js, Java, Kotlin, Android

Full-stack Developer

2014 - 2017
MaxiPizza
  • 构建了一个Android应用程序，用于放置客户订单和监控交付进度.
  • 开发了一个Android应用程序，帮助送货司机处理订单内容和导航.
  • Redesigned a company's website and online ordering system.
  • Developed desktop software to generate and print customer invoices.
  • Built a type of desktop software to facilitate employee management.
  • 自动同步订单与第三方订单和交付服务.
  • Redesigned intranet web tools for restaurant management.
  • Automated email and text message promotional campaigns.
Technologies: Mobile App Development, SQL, Swift, Full-stack, Flutter, Model View ViewModel (MVVM), Model View Intent (MVI), Model View Presenter (MVP), Dagger 2, IntelliJ IDEA, Reactive Programming, GPS, Google Location API, Google APIs, Material Design, RxJava 2, iOS, Visual Studio, Android Studio, Facebook API, Mobile Payments, Test-driven Development (TDD), Google Maps SDK, Firebase, MySQL, JavaScript, CSS, HTML, PHP, Ruby, MaxDB, ASP.NET, C#, Java, Kotlin, Android

Network Technician

2006 - 2011
University of Wisconsin-La Crosse
  • 自动化部署思科路由器和计算机网络配置.
  • Installed and maintained fiber-optic and copper cabling.
  • Performed remote and on-site diagnostics of networked devices.
  • Developed and maintained the networking department's web page.
Technologies: Ruby, Cisco

Release Engineer

2007 - 2010
SAP BusinessObjects
  • 构建一个集中式构建服务器，以取代现场七个团队使用的单独构建服务器.
  • 设计了一个内部网网页来显示所有团队的构建结果.
  • 自动每晚构建，并向团队经理发送构建报告.
Technologies: SQL, Apache Ant, Perforce, Ruby

Dubsmash

该应用程序允许用户对包括歌曲部分在内的音频剪辑进行假唱, movies, and famous quotes. 用户可以上传自己的音频，并在录音中添加彩色滤镜和文本动画. 用户必须将视频保存到自己的设备上，然后才能通过其他消息应用程序发送.

CarTrek

这是一个白色标签的汽车共享应用程序，客户遍布欧洲和亚洲，允许租用私人和公司拥有的汽车.

As the lead Android developer, 我实现了支持多个地图提供者和支付处理等新功能, rebranded the app for individual client companies, and performed general maintenance tasks.

Shadda

这是一个将客户与当地企业联系起来的平台，这些企业有办法为他们的产品送货上门, but don't have their own infrastructure for placing such orders. While the client app is currently available only on iOS, the business app is available in both iOS and Android versions.

As the developer for the Android app, I worked with Google Maps, Mapbox navigation, communicating with the Firebase backend, and implemented a visual redesign of the app.

Airon

一个Android应用程序，允许用户发布和浏览智能手机的视频评论, along with various social media features. 该应用程序与网站后端以及视频托管服务进行通信.

FireWatch Solutions (Internal-use App)

http://www.firewatchsolutions.com/
FireWatch Solutions为前往世界高风险地区的人们提供各种私人安全服务. 该应用程序允许现场员工协作构建有关客户目的地的报告. 这包括记录客户计划参观的各个场馆的多媒体和地理空间信息, building maps of the area, 并创建自定义图形元素，如绘制平面图.

TimeGuru

http://avibortnick.com/time-guru/
这是一款安卓应用程序，可以作为一个复杂的节拍器，用于音乐练习，具有诸如组合时间签名等高级功能.

多年来，我实施了新功能，重新设计了应用程序，并进行了一般维护.

MaxiPizza

http://www.maxipizza.pl/
MaxiPizza是一家披萨连锁店，我和它合作了几年.

除此之外，我还建立了他们的后端，网站和匹配的Android应用程序. The whole set spans numerous platforms, including Windows and Unix servers, 各种数据库和通信协议以及基于web和android的客户端应用程序.

Languages

Kotlin, Java, SQL, c#， HTML, CSS, Swift, GraphQL, PHP, JavaScript, Ruby

Libraries/APIs

RxJava 2, Google Location API, Google API, Google Maps SDK, Google Drive API, Node.Facebook API, OpenStreetMap API, Yelp API, WhatsApp API, Accelerometers

Tools

Android Studio, Visual Studio, IntelliJ IDEA, Perforce, Apache Ant, JWPlayer, Branch.io

Paradigms

Model View Presenter (MVP), Model View ViewModel (MVVM), Reactive Programming, Model View Intent (MVI), Test-driven Development (TDD), Continuous Integration (CI), Scrum

Platforms

Android, Firebase, Google Cloud Platform (GCP)， Google App Engine, iOS

Storage

Firebase实时数据库，MySQL, SQLite, Realm, MaxDB, Cloud Firestore

Other

Full-stack, Mobile App Development, GPS, Video & Audio Processing, Video Streaming, Material Design, AdMob, Cisco, Room, Near-field Communication (NFC), Mapbox SDK, Mobile Payments, Bluetooth

Frameworks

ASP.NET, Dagger 2, Flutter

2006 - 2010

理工科学士学位，计算机科学、数学、物理专业

University of Wisconsin-La Crosse - La Crosse, WI, USA

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