Calin Calin - Senior iOS Developer

Q: Where is Calin based?

Calin is based in Berlin, Germany .

Q: What languages does Calin speak?

Calin speaks the following languages: English (Advanced), German (Elementary), Romanian (Elementary) .

Q: How many years of experience does Calin have?

Calin has at least 6 years of experience. During this time, Calin has worked in at least 2 different roles and for 6 different companies . The average length of individual experience is 1 year . Note that Calin may not have shared all experience and actually has more experience.

Q: What companies has Calin worked for in recent years?

In recent years, Calin has worked for Gorillas , FLASH , Marquardt Service App , and Yummly .

Q: Which industries is Calin most experienced in?

Calin is most experienced in industries like Transportation and Logistics , Retail , and Information Technology (IT) . Calin also has some experience in Food and Beverage , Media, Entertainment and Publishing , and Aerospace and Defense .

Q: Which business areas is Calin most experienced in?

Calin is most experienced in business areas like Information Technology (IT) and Product Development .

Q: Which industries has Calin worked in recently?

Calin has recently worked in industries like Transportation and Logistics , Retail , and Information Technology (IT) .

Q: Which business areas has Calin worked in recently?

Calin has recently worked in business areas like Information Technology (IT) and Product Development .

Q: What is Calin's education?

Calin holds a Bachelor in Computer Information Technology from Technical University of Cluj-Napoca .

Recommended expert

Berlin, Germany

Experience

Jan 2022 - Dec 2023

2 years

Gorillas

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, and 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.
Skills: Firebase Auth, Google Places, Google Maps, Segment, Adjust, Braze, Rich Push Notifications

Jan 2022 - Dec 2022

1 year

Senior iOS Developer

FLASH

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 product loading experience by integrating a caching layer implemented using Core Data and FetchRequest.
Skills: SwiftUI, App Clip, Apple Pay, Stripe SDK, GitHub Actions

Jan 2021 - Dec 2022

2 years

Berlin, Germany

iOS Developer

Marquardt Service App

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.
Skills: Core Data, NSFetchedResultsController, Diffable Data Sources, Cell Content Configuration, Combine, MapKit, PhraseSDK, Bitrise

Jan 2020 - Dec 2021

2 years

iOS Developer

Yummly

Increased monthly business revenue by 12% by redesigning the paywall using a modern layout that supports displaying 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 was implemented in the existing tvOS application.
Skills: Apple IAP, tvOS, SwiftUI, CircleCI, fastlane, git submodules

Jan 2019 - Dec 2020

2 years

iOS Developer

Fortune

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.
Skills: Database Design, StoreKit, Travis CI

Jan 2018 - Dec 2019

2 years

iOS Developer

Garmin Pilot

Developed a companion app that connects to various Garmin devices installed on a private airplane.

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Transportation (2 years), Retail (2 years), Information Technology (2 years), Food and Beverage (2 years), Media and Entertainment (2 years), and Aerospace and Defense (2 years).

Transportation

Retail

Information Technology

Food and Beverage

Media and Entertainment

Aerospace and Defense

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (6 years) and Product Development (6 years).

Information Technology

Product Development

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. Do you need a mobile solution for your business? Drop me a message.

Skills

Swift 8 Years
Objective-c 5 Years
User Experience 8 Years
Firebase 5 Years
Core Data 5 Years
App Extensions 5 Years
Continous Integration 4 Years
Swiftui 2 Year
Combine 1 Year

Languages

English

Advanced

German

Elementary

Romanian

Elementary

Education

Technical University of Cluj-Napoca

Bachelor of Computer Information Technology · Computer Information Technology · Cluj-Napoca, Romania

Profile

Created

July 2023

Last Update

February 2026

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Calin based?

Calin is based in Berlin, Germany.

What languages does Calin speak?

Calin speaks the following languages: English (Advanced), German (Elementary), Romanian (Elementary).

How many years of experience does Calin have?

Calin has at least 6 years of experience. During this time, Calin has worked in at least 2 different roles and for 6 different companies. The average length of individual experience is 1 year. Note that Calin may not have shared all experience and actually has more experience.

What roles would Calin be best suited for?

Based on recent experience, Calin would be well-suited for roles such as: Senior iOS Developer, iOS Developer.

What companies has Calin worked for in recent years?

In recent years, Calin has worked for Gorillas, FLASH, Marquardt Service App, and Yummly.

Which industries is Calin most experienced in?

Calin is most experienced in industries like Transportation and Logistics, Retail, and Information Technology (IT). Calin also has some experience in Food and Beverage, Media, Entertainment and Publishing, and Aerospace and Defense.

Which business areas is Calin most experienced in?

Calin is most experienced in business areas like Information Technology (IT) and Product Development.

Which industries has Calin worked in recently?

Calin has recently worked in industries like Transportation and Logistics, Retail, and Information Technology (IT).

Which business areas has Calin worked in recently?

Calin has recently worked in business areas like Information Technology (IT) and Product Development.

What is Calin's education?

Calin holds a Bachelor in Computer Information Technology from Technical University of Cluj-Napoca.

What is the availability of Calin?

The availability of Calin needs to be confirmed.

What is the rate of Calin?

Calin's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.