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Marcilio Junior
Senior Mobile Engineer II at Teamwork.com
Belo Horizonte, Brazil
I bring over a decade of iOS development expertise to the table, with 7 years of remote work experience for companies across Europe and the U.S. My skills encompass Swift, architectural patterns, the main third-party frameworks, and the latest iOS technologies. I thrive in collaborative environments, partnering closely with designers and product managers to deliver high-quality software, and my pragmatic approach to challenges ensures projects stay on track. My career goal is to advance in iOS development and take on technical leadership roles, guiding innovative projects and mentoring emerging talent.
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209.2
CodersRank Rank
Top 4%
Associate
Developer
Swift
Top 10
Swift
Developer
Brazil
Highest experience points: 0 points,
0 activities in the last year
Swift
140.4
exp.
JSON
13.1
exp.
JavaScript
8.9
exp.
Objective-C
6.5
exp.
Less
5.9
exp.
SCSS
5.9
exp.
List your work history, including any contracts or internships
Teamwork.com
5 years 7 months
Senior Mobile Engineer II
Jan 2023 - Present (1 year 10 months)
• Significantly improved the developer experience of the team by migrating the codebase to use Tuist as the main tool for managing and generating projects, resulting in:
• A 284% improvement in build times.
• A 285% improvement in CI times, leading to cost savings in the CI.
• Conducted research and implemented Maestro as the official UI testing tool in the mobile team.
• Successfully migrated the Chat codebase to use Tuist, ensuring consistency across both
applications.
• Led the refactor of the iOS architecture, implementing best practices of SOLID and Clean
Architecture.
• Provided mentorship to fellow developers.
• Worked on templates for scaffolding new modules in the application.
• Initiated migration of RxSwift to Swift Structured Concurrency to handle async operations.
• Developed and maintain internal frameworks in the company for OAuth authentication and a
reusable file uploading system.
• Converted the app to work on iPad and M1 Macs.
• Proficient in technologies including Swift, SwiftUI, RxSwift, CocoaPods, SPM, Tuist, Maestro,
XCTest, Quick, Nimble, CoreData, Realm, Carthage, Structured Concurrency, UIKit, Lottie, CoreGraphics, Keychain, and Git.
• A 284% improvement in build times.
• A 285% improvement in CI times, leading to cost savings in the CI.
• Conducted research and implemented Maestro as the official UI testing tool in the mobile team.
• Successfully migrated the Chat codebase to use Tuist, ensuring consistency across both
applications.
• Led the refactor of the iOS architecture, implementing best practices of SOLID and Clean
Architecture.
• Provided mentorship to fellow developers.
• Worked on templates for scaffolding new modules in the application.
• Initiated migration of RxSwift to Swift Structured Concurrency to handle async operations.
• Developed and maintain internal frameworks in the company for OAuth authentication and a
reusable file uploading system.
• Converted the app to work on iPad and M1 Macs.
• Proficient in technologies including Swift, SwiftUI, RxSwift, CocoaPods, SPM, Tuist, Maestro,
XCTest, Quick, Nimble, CoreData, Realm, Carthage, Structured Concurrency, UIKit, Lottie, CoreGraphics, Keychain, and Git.
iOS Engineering Lead
Dec 2021 - Dec 2022 (1 year)
• Led a team of 4 iOS developers, providing guidance and support.
• Conducted 1:1s and performance reviews for all team members.
• Ran technical meetings to make team decisions on the next technical steps.
• Mentored junior developers to foster growth and skill development.
• Collaborated with other team leads to ensure alignment in achieving mobile goals.
• Worked closely with the hiring department, conducting evaluations and interviews for new team
members.
• Successfully onboarded two new members to the team.
• Extensively worked on the implementation of SwiftUI as the primary technology for building new
screens.
• Developed and maintained internal frameworks in the company for OAuth authentication and a reusable file uploading system.
• Proficient in technologies including Swift, SwiftUI, RxSwift, CocoaPods, CoreData, Realm, Carthage, UIKit, Lottie, MapKit, CoreLocation, CoreGraphics, Keychain, and Git
• Conducted 1:1s and performance reviews for all team members.
• Ran technical meetings to make team decisions on the next technical steps.
• Mentored junior developers to foster growth and skill development.
• Collaborated with other team leads to ensure alignment in achieving mobile goals.
• Worked closely with the hiring department, conducting evaluations and interviews for new team
members.
• Successfully onboarded two new members to the team.
• Extensively worked on the implementation of SwiftUI as the primary technology for building new
screens.
• Developed and maintained internal frameworks in the company for OAuth authentication and a reusable file uploading system.
• Proficient in technologies including Swift, SwiftUI, RxSwift, CocoaPods, CoreData, Realm, Carthage, UIKit, Lottie, MapKit, CoreLocation, CoreGraphics, Keychain, and Git
Senior iOS Engineer
Mar 2019 - Dec 2021 (2 years 9 months)
• Actively contributed to the migration of the Appcelerator version to a fully native version of the Teamwork app.
• Explored new technologies to enhance app performance, sharing insights with the team.
• Worked on the Chat application for internal communication and with select client groups.
• Became the primary technical reference within the iOS team.
• Developed and maintained internal frameworks in the company for OAuth authentication and a
reusable file uploading system.
• Skilled in technologies such as Swift, SwiftUI, RxSwift, CocoaPods, SPM, XCTest, CoreData,
Realm, UIKit, Lottie, CoreGraphics, Keychain, and Git.
• Explored new technologies to enhance app performance, sharing insights with the team.
• Worked on the Chat application for internal communication and with select client groups.
• Became the primary technical reference within the iOS team.
• Developed and maintained internal frameworks in the company for OAuth authentication and a
reusable file uploading system.
• Skilled in technologies such as Swift, SwiftUI, RxSwift, CocoaPods, SPM, XCTest, CoreData,
Realm, UIKit, Lottie, CoreGraphics, Keychain, and Git.
Alkemy
May 2022 - Aug 2022 (3 months)
Mentor
In this capacity, I served as a mentor for aspiring iOS developers, providing instructional sessions on Swift programming and fundamental iOS concepts within the iOS bootcamps organized by Alkemy. My role involved guiding participants through the intricacies of iOS development, nurturing their growth, and equipping them with the essential skills to thrive in the field.
Wellzesta Inc.
Jan 2019 - Jan 2021 (2 years)
iOS Developer
• Refactored app architecture to MVVM.
• Worked closely with the designer to implement an app for a specific user group of elders aged
75+.
• Integrated and synchronized the app calendar with iCloud calendar.
• Proficient in technologies including Swift, RxSwift, CocoaPods, Lottie, EventKit, GraphQL, and Git.
• Worked closely with the designer to implement an app for a specific user group of elders aged
75+.
• Integrated and synchronized the app calendar with iCloud calendar.
• Proficient in technologies including Swift, RxSwift, CocoaPods, Lottie, EventKit, GraphQL, and Git.
This section lets you add any degrees or diplomas you have earned.
IGTI
Graduate, Software Architecture Strategies
Jan 2011 - Jan 2012
PUC Minas
Bachelor's degree, Computer Science
Jan 2007 - Jan 2010
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