Mbusi is available for hire
Hire MbusiMbusi Sifiso Hlatshwayo
Verified Expert in Engineering
Software Developer
Location
Los Angeles, CA, United States
Toptal Member Since
February 1, 2024
Mbusi is a results-driven senior iOS engineer with solid technical and leadership experience. He specializes in Swift, Objective-C, and UIKit and has strong communication and mentorship skills. He has worked cross-functionally at enterprises like Walmart and Experian and SMEs like Drizly and Kimble Applications. As an expert in iOS architecture and development, REST APIs, and Agile methodologies, Mbusi led and built a new modular framework at Walmart—reducing development time significantly.
Portfolio
Walmart
iOS, Swift, UIKit, Firebase, GraphQL, Xcode, REST APIs, User Interface (UI)...
Experian
iOS, Swift, SwiftUI, Model View ViewModel (MVVM), REST APIs...
Drizly
Objective-C, Swift, SQL, REST APIs, User Interface (UI), Mobile, PSD to Swift...
Experience
Availability
Part-time
Preferred Environment
MacOS
The most amazing...
...thing I've developed is a new modular framework that allowed other teams to use existing core Walmart search functionality, greatly reducing development time.
Work Experience
Senior iOS Software Engineer
2021 - PRESENT
Walmart
- Acted as a tech lead for the search iOS team, conducting code reviews and mentoring junior developers.
- Reduced development time by up to 70% after leading the creation of a new modular framework that allowed other teams to use existing search functionality.
- Drove the initiative to reduce bug-related delays by 25% by building automated tests using XCTest and XCUITest.
- Led a multi-team initiative to redesign the product tile, introducing multiple variants of the pricing view controlled by remote feature flags.
- Rearchitected the search landing page to use modular UI components driven by server-side configurations.
- Lowered the mean time to detect critical errors to below five minutes after adding over 50 alerts to improve visibility into the status of multiple priority zero (P0) flows for our search functionality.
- Assisted architects in validating performance metrics for peak performance mode during the high-traffic holiday season.
Technologies: iOS, Swift, UIKit, Firebase, GraphQL, Xcode, REST APIs, User Interface (UI), Mobile, VPN, PSD to Swift, SDK Development, iOS SDK
iOS Software Engineer
2020 - 2021
Experian
- Collaborated with product managers, back-end engineers, and Android developers to set standards for a new mobile content management service.
- Rearchitected the application's dashboard page, implementing all UI components in the SwiftUI server-driven UI from the legacy Objective-C UIKit.
- Improved error and user tracking by integrating a new analytics framework throughout the app.
- Added new features and maintained legacy Objective-C code, storyboards, and XIB files.
Technologies: iOS, Swift, SwiftUI, Model View ViewModel (MVVM), REST APIs, User Interface (UI), Mobile, VPN, PSD to Swift, SDK Development, iOS SDK
iOS Implementation Engineer
2020 - 2020
Drizly
- Refactored legacy Objective-C code to the latest Swift versions.
- Extended functionality to our favorites section within the iOS app.
- Resolved production bugs in close collaboration with product owners.
- Integrated our clients' point-of-sale inventory from their in-store PCs to our servers by installing scripts with SQL queries that run periodically.
Technologies: Objective-C, Swift, SQL, REST APIs, User Interface (UI), Mobile, PSD to Swift, iOS SDK
Salesforce Support Engineer
2017 - 2020
Kimble Applications
- Configured custom objects, fields, and reports for end users as requested.
- Debugged production bugs reported by end users using Salesforce debugging tools.
- Analyzed databases and Salesforce, writing queries and scripts to close tickets.
Technologies: Salesforce, Apex
iOS Developer
2017 - 2017
Chatter
- Interpreted written business requirements and technical specification documents to design and implement executable code solutions.
- Implemented a browse-by-category feature written in Swift and UIKit.
- Validated core functionality by implementing unit tests with the XCTest framework.
Technologies: Swift, Objective-C, MVC Design, UIKit, REST APIs, User Interface (UI), Mobile, Instant Messaging, PSD to Swift, iOS SDK
iOS Developer Intern
2015 - 2016
Phunware
- Assisted internal teams in diagnosing and debugging production issues.
- Refactored the legacy code using a manual retain-release to the new automatic reference counting feature.
- Maintained and resolved QA issues in iOS applications for various Fortune 500 customers.
Technologies: Objective-C, UIKit, User Interface (UI), Mobile, PSD to Swift, iOS SDK
Experience
Walmart eCommerce App
https://apps.apple.com/us/app/walmart-shopping-savings/id338137227An iOS direct-to-customer eCommerce app built in Swift with programmatic UIKit. As the search iOS tech lead, I drove the development of multiple features. The app is highly customizable with a modular UI driven by components fetched from a back end.
Skills
Languages
Swift, GraphQL, Objective-C, SQL, Apex
Frameworks
UIKit, iOS SDK, SwiftUI
Libraries/APIs
REST APIs
Tools
Xcode, Splunk, VPN
Paradigms
Model View ViewModel (MVVM), MVC Design
Platforms
MacOS, iOS, Mobile, Firebase, Salesforce
Other
User Interface (UI), PSD to Swift, SDK Development, Algorithms, Data Structures, Instant Messaging
Education
2015 - 2017
Bachelor's Degree in Computer Science
Xavier University - Cincinnati, Ohio, USA
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