Available to hire
Hello! I’m Denis Arsenault, a veteran software designer and architect focused on iOS and Mac app development. I love crafting robust, scalable software with Swift and Objective-C, integrating APIs, and delivering polished user experiences. I thrive in Agile teams and continually seek to optimize performance and security across the full app lifecycle.
Beyond coding, I lead cross-functional collaboration, mentor teammates, and drive architecture decisions that improve reliability and maintainability. My experience spans education technology, security software, and enterprise tools, and I enjoy turning complex problems into delightful, user-friendly solutions.
Skills
Language
English
Fluent
Work Experience
Cyber Research Consultant at Killswitch Cyber LLC
April 1, 2025 - PresentConducting threat research and vulnerability analysis on iOS ecosystems, developing security tools, and automation scripts to enhance application security. Collaborating with cross-functional teams to integrate security throughout the software development lifecycle. Develop security tools, proof-of-concepts, and automation scripts for offensive and defensive use cases.
Mobile Developer (iOS) at Mass Virtual Inc
October 1, 2023 - March 1, 2025Designed and implemented LCMS and distribution for deploying web-based Unity training simulations on iPad OS. End-to-end development of iPad applications using UIKit and SwiftUI, focusing on data security and compatibility.
Lead Software Engineer at Securemac
February 1, 2022 - September 1, 2023Led the enhancement of shared Mac applications, focusing on malware detection and data security for MacScan3 and Privacy Scan. Designed and developed a sandboxed version of MacScan3 utilizing secure bookmarks for enhanced user security.
Consultant Lead Software Engineer at Spirion
March 1, 2020 - February 1, 2022Enhanced and maintained shared C++ and Objective-C code for data security endpoint agents across multiple platforms, including iOS.
Consultant Senior Software Engineer at dotdecimal
October 1, 2019 - March 1, 2020Developed a 1.0 product for the Radiation Therapy space, including Swift implementation and UI/UX design using UIKit and Structure Framework with LIDAR Camera.
Consultant Software Engineer at Satcom Direct
July 1, 2019 - September 1, 2019Developed iOS applications for in-flight connectivity solutions, enabling real-time communication and flight logging for pilots called SDCrew. Integrated various APIs for satellite communication and data transfer, enhancing the functionalities of existing mobile applications.
Mobile Application Developer at Dear Doodles
June 1, 2013 - July 1, 2014Designed and developed a mobile app for a children's educational platform, which included interactive drawing and learning features. Augmented Reality iOS App: Developed an iOS application integrating ARKit to livestream voice actors' facial expressions, showcasing innovative uses of AR technology.
Senior Software Engineer at Malwarebytes Inc.
September 1, 2015 - May 1, 2019Developed native iOS applications for malware endpoint scanning and remediation, focusing on performance and user experience.
Senior Solutions Architect at Houghton Mifflin Harcourt
April 1, 2011 - January 1, 2014Spearheaded the design and development of digital learning products, including educational apps for the iTunes Store Algebra 1 Fusion, and Instant Readers. Lead Architect for redesigning Digital Book content generation to proprietary iPad products for Digital Learning platform in iTunes app store.
Lead Software Engineer at Spirion
March 1, 2020 - February 1, 2022Enhanced and maintained shared C++ and Objective-C code for data security endpoint agents across multiple platforms, including iOS.
Senior Software Engineer at dotdecimal
October 1, 2019 - March 1, 2020Developed a 1.0 product for the Radiation Therapy space, including Swift implementation and UI/UX design using UIKit and Structure Framework with LIDAR Camera.
Software Engineer at Satcom Direct
July 1, 2019 - September 1, 2019Developed iOS applications for in-flight connectivity solutions, enabling real-time communication and flight logging for pilots called SDCrew. Integrated various APIs for satellite communication and data transfer, enhancing functionalities.
Cyber Research Consultant at Killswitch Cyber LLC
April 1, 2023 - PresentDevelop security tools, proof-of-concepts, and automation scripts for offensive and defensive use cases. Generated real-time threat detection engine for Mac/iOS with real-time detection and advanced steganography.
Mobile Developer iOS at Mass Virtual
October 1, 2023 - March 1, 2025Refactoring to support new scanning products for data security implementations. Virtual Hanger LCMS platforming for iPad with embedded Unity Learning Modules. Deployment of cross-platform Bash scripts to handle deployment for testing platform. OS level compatibility enhancements for legacy applications. End-to-end development of LCMS product for iPad based deployment in UIKit and SwiftUI.
Software Engineer at Spirion
July 1, 2023 - October 1, 2023Consultant Software Engineer; refactoring to support new scanning products for MAC/IOS data security implementations; deployment of cross-platform Bash scripts to handle deployment for testing platform; OS level compatibility enhancements for legacy applications.
Lead Software Engineer at Securemac (Angel Funding Initiative)
February 1, 2022 - September 1, 2023Led enhancements for Mac applications focusing on malware detection and data security. Design of sandboxed version of MacScan3 and used secure bookmarks to grant access. Malware definitions generation project for populating international resource of latest zero-day threats.
Software Engineer at dotdecimal
October 1, 2019 - March 1, 2020Release 1.0 product. Worked with Occipital Structure Framework and LIDAR cameras. Integration with treatment systems and UI/UX design.
Senior Software Engineer at DearDoodles Inc
May 1, 2015 - July 1, 2019POC and concept generation for Augmented Reality components. iOS app to record voice actors' facial expressions with ARKit. Integration of R&D into viable product concepts. Coordination of Unity concepts into Mac/iOS environment.
Lead Software Engineer at Spirion
July 1, 2023 - October 1, 2023Lead Software Engineer in charge of 8 agent developers. Refactoring to support new scanning products for data security implementations. Deployment of cross-platform Bash scripts to handle deployment for testing platform. OS level compatibility enhancements for legacy applications.
Senior Software Engineer at BlueToad Inc.
January 1, 2011 - August 1, 2014Native Lead Developer for Digital Reader Engine. Apps on App Store to date: 36+ (Based on 1 core iOS App Frameworks). Provided full leadership in best practices for GCD and revamp of existing reader to the 2.x version.
Mobile Developer iOS at Mass Virtual Inc.
October 1, 2023 - March 1, 2025End-to-end iOS development including UIKit/SwiftUI, refactoring to support new scanning products for data security, Unity-based learning modules on iPad, deployment to App Store/ad-hoc, and cross-platform deployment scripts.
Consultant Software Engineer at Spirion
July 1, 2023 - October 1, 2023Refactoring to support new scanning products for MAC/IOS data security implementations; cross-platform deployment scripts; OS-level compatibility enhancements; led end-to-end LCMS product development for iPad.
Consultant Software Engineer at dotdecimal
October 1, 2019 - February 1, 2020Work with framework from Occipital scanning 3-D cameras with Occipital Structure Framework and LIDAR cameras; integration with treatment systems and UI/UX Design; applications deployed to App Store (decimal3D 1.0).
Consultant Senior Software Engineer at DearDoodles Inc.
June 1, 2019 - July 1, 2019POC and concept generation for Augmented Reality components; iOS app to record voice actors facial expressions with ARKit; integration of R&D into viable product concepts; coordination of Unity concepts into Mac/iOS environment.
Senior Software Engineer at BlueToad Inc.
February 1, 2015 - August 1, 2015Native Lead Developer for Digital Reader Engine; App Store presence; leadership in GCD best practices and revamp of reader to 2.x version.
Education
M.S. in Computer Information Systems at University of Phoenix
January 1, 1997 - January 1, 1999B.S. in Computer Information Systems at St. Leo University
January 1, 1987 - January 1, 1990M.S. at University of Phoenix
January 1, 1997 - January 1, 1999B.S. at St. Leo University
January 1, 1987 - January 1, 1990M.S. at University of Phoenix
January 1, 1997 - January 1, 1999B.S. at St. Leo University
January 1, 1987 - January 1, 1990Bachelor of Science in Computer Information Systems at St. Leo University
January 1, 1987 - January 1, 1990Master of Science in Computer Information Systems at University of Phoenix
January 1, 1997 - January 1, 1999Bachelor of Science in Computer Information Systems at St. Leo University
January 1, 1987 - January 1, 1990Qualifications
Agile/Scrum Methodologies
January 11, 2030 - December 5, 2025Various Technical Workshops
January 11, 2030 - December 5, 2025Industry Experience
Software & Internet, Professional Services, Media & Entertainment, Education, Computers & Electronics
Skills
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