
Radoslaw Cieciwa
Verified Expert in Engineering
Mobile App Developer
Ko Lanta Noi Krabi, Thailand
Toptal member since May 25, 2020
With nine years of experience on the iOS platform and hands-on knowledge in Android, Radek is a great fit to lead your iOS mobile development. Easygoing and communicative, he brings insight and excellence to all his projects. Radek has worked on highly scaled social apps with 60,000 MAO, or 400,000 registered users. He knows how to build data-driven features, measure analytics impact, and operate in an agile environment.
Portfolio
Experience
- iOS - 8 years
- A/B Testing - 5 years
- Android - 4 years
- SQLite - 3 years
Availability
Preferred Environment
Terminal, Charles, Emacs, AppCode, Xcode
The most amazing...
...apps I've worked on were for Bumble and Brainly. I completed challenging tasks, product metrics, and thorough A/B testing, exceeding all goals.
Work Experience
Technical Team Leader
Bumble
- Developed a dating app used by millions of people world wide.
- Monitored product metrics, AppStore ratings, and crash rate on a daily basis.
- Implemented a main card swiping mechanism of the app, with focus on testable data and neat UI/UX.
- Assisted with team performance, conducted team retrospectives and plannings. Managed team to ensure projects were completed on time according to specifications.
iOS Engineer
Badoo
- Developed a dating app with 300,000 registered users. Assisted in the development of other minor apps in the group.
- Tracked analytics for the app and performed A/B tests.
- Initiated an internal meet-up for iOS where we regularly shared our knowledge and expertise.
Senior iOS Developer
Brainly
- Developed a highly scaled (60,000 MAU) app for kids education based on a questions and answers format.
- Performed many A/B tests. Deployed MVP to validate ideas before full implementations.
- Worked in a fully trained scrum cross the functional team (product, iOS, Android and back end).
Senior Mobile Developer
Softhis
- Developed approximately 15 apps for iOS and Android. Some were internal products which I worked on in kanban. Developed a CRUD app for the Big Travel Agency.
- Implemented functional tests in Frank and Calabash for iOS and Android.
- Assisted clients with technical expertise, while being assigned to them as a point of contact.
Junior Mobile Developer
Solution Lions
- Ported a game from iOS to Android with the use of AndEngine.
- Implemented eight apps that span across three platforms: iOS, Android, and Windows Phone.
- Implemented interactive apps for big retailers that included highly animated content.
- Implemented two apps for Windows Phone with one application for Blackberry.
- Collaborated on iOS since 4.3, Android 1.6, and Windows Mobile.
Experience
Bumble
Badoo
https://apps.apple.com/us/app/badoo-dating-chats-friends/id351331194Brainly
Education
Master of Science Degree in Computer Science
AGH University of Science and Technology - Cracow, Poland
Skills
Libraries/APIs
OpenCV, OpenGL, Firebase iOS SDK
Tools
Git, Calabash, Xcode, AppCode, Charles, Terminal, Adobe Photoshop, Sketch, Emacs
Languages
Objective-C, Swift, SQL, Java, Python
Platforms
iOS, Windows Phone, Android
Frameworks
Core Data, AndEngine, SwiftUI
Paradigms
Model View ViewModel (MVVM), Functional Testing, Functional Reactive Programming
Storage
SQLite, SlimPHP, Cloud Firestore, NoSQL
Other
A/B Testing, Protocol Buffers
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