Ky Leggiero
@kyleggiero
Lead iOS software engineer driving large-scale Swift migrations, modern architectures, and cross-platform performance.
United StatesWhat I'm looking for
I am a lead iOS software engineer with over 19 years of experience architecting and delivering high-performance Swift applications across iOS, macOS, and Apple platforms. I specialize in large-scale migrations, Swift concurrency adoption, and modernizing codebases to improve reliability and maintainability.
I have led zero-downtime transitions of industry-scale codebases, authored migration roadmaps used by 100 engineers, and reduced concurrency-related crashes by 95%. I also spearheaded SwiftUI transitions and cross-platform layer expansions to support multiple OS targets.
My cross-functional work includes partnering with product, UI/UX, QA, and multiple engineering teams to synchronize development, streamline workflows, and increase feature deployment speed. I have driven DEI improvements and established department-wide agile and CI/CD practices that improved team productivity and release cadence.
I deliver practical engineering leadership, mentoring, and hands-on development to produce accessible, animation-rich, and adaptive user experiences. I seek roles where I can continue modernizing platforms, mentor engineers, and scale reliable systems for millions of users.
Experience
Work history, roles, and key accomplishments
Lead Software Engineer
MLB
Sep 2024 - Dec 2025 (1 year 3 months)
Led Swift concurrency migration and cross-platform layer expansion across iOS, macOS, and Apple platforms, reducing concurrency crashes by 95% and preserving business logic with zero-downtime transition used by 100+ engineers.
Staff Software Engineer
Composable
May 2022 - Jun 2023 (1 year 1 month)
Spearheaded transition to SwiftUI for core components and synchronized delivery across five teams, improving development efficiency by 30% and increasing feature deployment speed by 25%.
Lead Software Engineer
YesHealth
Feb 2021 - Mar 2022 (1 year 1 month)
Drove engineering across four health products on iOS and Android, migrated codebase from Objective-C/UIKit to Swift/SwiftUI raising development efficiency 30% and implemented DEI improvements impacting 100,000+ users.
Senior Software Engineer
PKWARE
Feb 2020 - Jan 2021 (11 months)
Redesigned PKWARE's iOS encryption app and led R&D for greenfield macOS/iOS encryption products, increasing user engagement by 30% and expanding security offerings by 25%.
Managed macOS file encryption software servicing 10,000 users, improved UI/UX across product lines raising satisfaction 12%, and partnered with QA to reduce defects by 30%.
Software Engineer
Renewed Vision
Jan 2016 - Jan 2017 (1 year)
Led modernization efforts for macOS software platforms, designing 30+ custom UI components and implementing features that increased engagement via animations and layout improvements.
Software Engineer
NCR
Jan 2015 - Jan 2016 (1 year)
Delivered POS features including 64-bit support and EMV payments, launched POS software supporting iOS and Android, and created drivers for 15 device types boosting transaction speed 30%.
Education
Degrees, certifications, and relevant coursework
Columbus State University
Bachelor of Science, Computer Science
Completed Bachelor of Science in Computer Science with coursework in software engineering, artificial intelligence, games programming, databases, networks, and operating systems.
Georgia Gwinnett College
Supplementary Studies
Supplementary studies including calculus, music, philosophy, sociology, and related coursework.
Availability
Location
United StatesAuthorized to work in
Portfolio
split.rentJob categories
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