Calin (Radu) Calin
Senior iOS Developer | Contractor | Freelancer
Experience
Jan 2021 - Dec 2023
2 yearsSenior iOS Developer | Contractor | Freelancer
Gorillas
- Groceries and food ordering app delivering the products in minutes.
- Successfully migrated 99.9 of the users to the new app by automatically logging them in using the token retrieved from the old app.
- Facilitated more than 400k signups in the first 3 months after releasing the redesigned app by supporting phone, Apple, Google, Facebook authentication methods implemented using Firebase.
- Helped more than 250k users successfully add their address by supporting search using Google Places and by selecting the exact location using Google Maps based on the service delivery zones.
- Firebase Auth, Google Places, Google Maps, Segment, Adjust, Braze, Rich Push Notifications.
Jan 2021 - Dec 2022
1 yearSenior iOS Developer | Contractor | Freelancer
Flash
- Instant mobile checkout app entirely implemented in SwiftUI.
- Helped the business process over 10 successful orders by implementing an App Clip capable of processing the delivery information using Apple Pay UI and handling the payments using Stripe SDK.
- Improved the products loading experience by integrating a caching layer implemented using Core Date and FetchRequest.
- SwiftUI, App Clip, Apple Pay, Stripe SDK, GitHub Actions.
Jan 2020 - Dec 2022
2 yearsSenior iOS Developer | Contractor | Freelancer
Marquardt Service App
- Internal app that helps employees organize their day to day work by digitalizing the entire paperwork process.
- Implemented the app from scratch to App Store as the only iOS developer.
- Reduced networking traffic by 100% by adding offline support for the main functionality using Core Data and NSFetchedResultsController.
- Reduced time spent for creating Firebase and TestFlight builds by 100% by automating the entire build process using Bitrise.
- Core Data, NSFetchedResultsController, Diffable Data Sources, Cell Content Configuration, Combine, MapKit, PhraseSDK, Bitrise.
Jan 2020 - Dec 2021
2 yearsSenior iOS Developer | Contractor | Freelancer
Yummly
- Recipe app that has received the "Editors' Choice" badge from Apple.
- Increased monthly business revenue by 12% by redesigning the paywall using modern layout that supports displaying of content using one or two columns depending on the device orientation.
- Increased revenue by getting over 10 monthly subscribers that joined on the paywall that I implemented in the existing tvOS application.
- Apple IAP, tvOS, SwiftUI, CircleCi, fastlane, git submodules.
Jan 2019 - Dec 2020
2 yearsSenior iOS Developer | Contractor | Freelancer
Fortune
- Content app that brings Fortune news, newsleters, and videos on mobile at devices.
- Increased business revenue from $0 to $10k per month by monetizing the app by adding a $21.99 in-app subscription item that appeared on a screen triggered by an external service depending on the article tags.
- Database Design, StoreKit, Travis CI.
Jan 2018 - Dec 2020
2 yearsSenior iOS Developer | Contractor | Freelancer
Garmin Pilot
- Companion app that connects to various Garmin devices installed on a private airplane.
- Dropped user search time from 5-10 minutes to less than 1 minute by designing and implementing a custom search functionality while adding a set of annotation tools using PDFKit.
- Improved customer service team efficiency by 40% by reducing the number of daily phone calls by designing and building and in-app feedback system without adding additional server load by automating the email feedback using Firebase Cloud Functions.
- PDFKit, Firebase, Build Time Optimization.
Summary
I am a freelancer with 8+ years of experience in iOS development. I help companies around the world implement their mobile solution, focusing on an exceptional user experience.
Languages
Romanian
Native
English
Advanced
Education
Technical University of Cluj-Napoca
Bachelor of Computer Information Technology · Computer Information Technology · Cluj-Napoca, Romania
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