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Cristhian Leon

Senior iOS Developer

A dynamic, hands-on, detail-oriented iOS developer with more than 7 years of experience in building apps for iOS & macOS, using a wide variety of tools to deliver performant, high-quality experiences.

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My Skills

Mobile

Swift

SwiftUI

Combine

Async/Await

MVVM-C

Fastlane

Backend

Golang

Gorm

Gin

Docker

MongoDB

PostgreSQL

My Experience

  • Senior iOS Developer
    Gorilla Logic / Colombia / present
    • Implemented MVVM-C pattern.
    • Boosted CoreData performance by 15%.
    • Enabled PCI compliant credit card feature.

    Stack: CoreData, Combine, Async/Await, UIKit

  • Senior iOS Developer
    Airtm Inc. / Mexico / 2022
    • Co-created app from scratch.
    • Enhanced Android team's GraphQL usage.
    • Developed modular app using SPM.

    Stack: SwiftUI, Combine, GraphQL, Fastlane, SPM

  • Senior iOS Developer
    Florio GmbH / Germany / 2020
    • Led multi-tenancy feature implementation.
    • Maintained Apple Watch and Siri extension.
    • Redesigned UI with UIKit and CoreGraphics.

    Stack: UIKit, UITest, HealthKit, Fastlane

  • Senior iOS Developer
    Wunder Mobility / Germany / 2019
    • Created UIKit library for custom brand styles.
    • Increased test coverage by 20%.
    • Reduced build times by 15% with Python scripts.

    Stack: RxSwift, GraphQL, Realm, Firebase

  • iOS Developer
    Globant / Colombia / 2018
    • Improved test coverage by 60% in app modules.
    • Refactored Objective-C code to Swift.
    • Enhanced test monitoring with SonarQube.

    Stack: Swift, Obj-C, XCTest, CoreAnimation

  • iOS Developer
    Novopayment / Colombia / 2017
    • Implemented face recognition user enrollment.
    • Built OCR for passport information.
    • Developed user creation framework for bank apps.

    Stack: CoreGraphics, Vision, UIKit, Carthage

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Things I've built

My Interests

  • Competitive Programming

    I love tackling challenging problems in programming, honing my coding skills.

  • UI/UX

    I enjoy creating smooth and memorable user experiences that last.

  • Mentorship

    I love helping new talent grow and sharing what I know with others.

  • Data Science

    I enjoy uncovering insights in datasets, and building predictive models.

What I've written

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