I am a Senior Mobile Engineer with extensive experience in designing and delivering high-performance iOS/mobile solutions across fintech, media, and analytics. I enjoy turning complex requirements into scalable, user-friendly apps and leading teams to deliver impactful products. I focus on robust architectures, performance optimization, and mentoring engineers, while collaborating across product, design, and backend teams. Proficient in Swift, SwiftUI, Objective-C, and Java, I also integrate with REST APIs, databases, and cloud services to build end-to-end systems.

Jibril Gueye

I am a Senior Mobile Engineer with extensive experience in designing and delivering high-performance iOS/mobile solutions across fintech, media, and analytics. I enjoy turning complex requirements into scalable, user-friendly apps and leading teams to deliver impactful products. I focus on robust architectures, performance optimization, and mentoring engineers, while collaborating across product, design, and backend teams. Proficient in Swift, SwiftUI, Objective-C, and Java, I also integrate with REST APIs, databases, and cloud services to build end-to-end systems.

Available to hire

I am a Senior Mobile Engineer with extensive experience in designing and delivering high-performance iOS/mobile solutions across fintech, media, and analytics. I enjoy turning complex requirements into scalable, user-friendly apps and leading teams to deliver impactful products.

I focus on robust architectures, performance optimization, and mentoring engineers, while collaborating across product, design, and backend teams. Proficient in Swift, SwiftUI, Objective-C, and Java, I also integrate with REST APIs, databases, and cloud services to build end-to-end systems.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert

Language

English
Fluent

Work Experience

Freelance iOS Software Engineer at Self
October 1, 2024 - Present
Built and deployed to the Apple App Store a video sharing app (Video4Social) from design to submission.
Senior iOS Engineer Contractor at Guitar Center Inc
August 1, 2023 - March 1, 2024
Rebuilt the internal Express Checkout app: implemented a fresh UI, price override, and roundup donation features; increased unit test coverage (approximately 15x) and added UI tests to improve stability and quality.
Senior iOS Engineer at Priceline Inc
November 1, 2021 - November 1, 2023
Implemented map navigation enhancements for optimization experiments, added Look Around in trip sections, VIP badgeing, inclusive badges for listings, and various banners; integrated WeatherKit and Preferences API; enabled feature overrides for testing; migrated Objective-C to Swift; fixed crashes and bugs.
Freelance iOS Software Engineer at Self
May 1, 2021 - October 1, 2021
From design to MVP of a crypto app; defined architecture and delivered initial product.
Senior iOS Engineer at Square Inc
April 1, 2020 - April 1, 2021
Supported Reader SDK 1 bugfixes and enhancements; advanced Reader SDK 2 alpha versions; added UI support for MockReaders; contributed to design documentation for CNP feature; added sonic branding support; built a complete touchless payment solution.
Senior iOS Engineer Contractor at TSU Inc
July 1, 2020 - February 1, 2021
Implemented core eCommerce features in the mobile social app; added multi-account support and account statistics insights; performed bug fixes and feature improvements; applied MVVM-based architecture.
Senior iOS Engineer Contractor at Zenabi Inc
August 1, 2019 - June 1, 2020
Single-handedly built a hotel reservation mobile app with MVVM architecture; managed CI/CD workflows (AppCenter, BitRise, TestFlight); delivered functional requirements and submitted two apps to the App Store.
Senior iOS Engineer Contractor at Federal Reserve Bank of New York
March 1, 2019 - August 1, 2019
Overhauled a prototype app from design to MVVM-based architecture; removed unnecessary dependencies and optimized for a 700-user installed base in the supervision group.
Engineering Manager / Senior iOS Developer at fuboTV Inc.
January 1, 2018 - March 1, 2019
Jan 2018 – Nov 2018: Engineering Manager responsible for team leadership, PR reviews, releases, and crash reduction; led app modernization and feature development. Nov 2018 – Mar 2019: Senior iOS Developer focusing on feature delivery and stabilization.
Team Leader at Viacom Inc.
June 1, 2016 - April 1, 2017
Led iOS development efforts; built and maintained multicast libraries; collaborated with TVE team; organized iOS Special Interest Group meetings.
Senior Mobile Developer Contractor at Viacom Inc.
September 1, 2015 - June 1, 2016
Contributed to mobile app development; supported feature delivery and code maintenance.
Senior Mobile Developer at NASDAQ OMX, CT, USA
June 1, 2014 - September 1, 2015
Enhanced Investor Relations app and Director Desk app; contributed to Director Desk NG components (document center, email, calendar, votes).
Senior iOS Engineer Contractor at HBO Inc, NY, USA
January 1, 2011 - May 1, 2014
Optimized HBOGO & MAXGO apps; designed high-performance image download and caching; streamlined URL requests; introduced crash reporting; migrated to ARC; mentored new engineers.
Senior iOS Engineer Contractor at Time Inc, NY, USA
November 1, 2009 - August 1, 2010
Supervised a team to deliver POCs for iPhone culinary app and iPad digital reader; architected a mobile gateway and digital reader with multi-part download and protocol buffer usage.
Senior Architect at Pragmatix Consulting Inc, Cheyenne, WY, USA
May 1, 2009 - September 1, 2015
Led design for backup/restore for iPhone, UI overhaul for PKGBackup, added sharing via Bonjour, Dropbox, and social channels; implemented auto-backup and cloud storage integration; released PKGBackup and SBOrganizer.
Senior Engineer / Architect at eLumindata Inc, Fairfield, CT, USA
March 1, 2007 - April 1, 2009
Implemented SOA-based applications; participated in architectural decisions; evaluated OSS; migrated to ESB; promoted Java best practices; migrated persistence and built caching and messaging solutions.
Senior Java Developer at Blueberry Software Inc, Stamford, CT, USA
April 1, 2004 - November 1, 2006
Implemented new features; migrated databases; prototyped caching and messaging; maintained production code and supported releases.
Software Application Support at eMeta Corp, NY, USA
November 1, 2003 - April 1, 2004
Designed and implemented test procedures; provided client configuration support; reported and tracked bugs.
Senior Java Developer at NDEX Systems Inc. (Financial), Montréal, Canada
June 1, 2002 - October 1, 2003
Architected and implemented components; automated build/deploy processes; supported migration and integration with Linux servers.
Senior Smalltalk Developer and Database Administrator at MARQUE D'OR, Montréal, Canada
February 1, 1997 - March 1, 2000
Developed name/trademark search engine; designed search architecture; handled DB administration and system enhancements.
Junior Smalltalk Programmer - Analyst at MARQUE D'OR, Montréal, Canada
February 1, 1996 - February 1, 1997
Entered the organization as a junior programmer/analyst, contributing to smalltalk-based projects and database work.
Programmer Smalltalk (Internship) at MARQUE D'OR, Montréal, Canada
July 1, 1995 - February 1, 1996
Internship focusing on GUI development and data handling for smalltalk-based projects.

Education

Master of Computer Science at University of Quebec, Montreal
January 11, 2030 - January 1, 2000
Bachelor of Computer Science at University of Quebec, Montreal
January 11, 2030 - January 1, 1995
Sun Certified Developer for Java (SCDJ) at Sun Microsystems
January 1, 2003 - March 30, 2026
Sun Certified Programmer for Java (SCPJ) at Sun Microsystems
January 1, 2002 - March 30, 2026

Qualifications

iOS
February 19, 2025 - February 19, 2025
Sun Certified Developer for Java (SCDJ)
January 1, 2003 - March 30, 2026
Sun Certified Programmer for Java (SCPJ)
January 1, 2002 - March 30, 2026

Industry Experience

Media & Entertainment, Financial Services, Software & Internet, Professional Services