Paul Lehn
Senior Software Engineer
Experienced iOS developer building and optimizing mobile applications with Swift, SwiftUI, and Combine. Recently implemented AI developer workflows that 3x engineering output at a Fortune 500 company. Proven expertise designing, testing, and deploying end-to-end app development and CI/CD pipelines.
About Me
I'm a Senior Software Engineer with over 12 years of experience in the technology industry. My expertise lies in mobile application development, specializing in the iOS ecosystem.
I'm passionate about creating innovative solutions and have worked on projects for clients ranging from small startups to the US Government.
Skills
Languages & Frameworks
Swift, SwiftUI, UIKit, Combine, MVVM, Swift Data, Python, TypeScript, Accessibility, SQL
AI Workflows
Claude Code, automation, skill creation, MCP management
CI/CD
Fastlane, CircleCI, Docker, Github Actions, Jenkins
Backend & APIs
REST, gRPC, GraphQL, Firestore, Parse Server, AWS
Tools & IDEs
Xcode, App Store Connect, TestFlight, Cursor, Visual Studio Code, Postman, Proxyman, Figma
Version Control
Git, Github, Bitbucket
Spoken Languages
English, Croatian
Work Experience
Senior iOS Engineer
Intuit | Atlanta, GA | 09/2025 to Present
- Engineered AI developer tooling with Claude Code, automating onboarding, Jira ticketing, PR reviews, and test generation, significantly reducing manual workflow time
- Shipped AI-driven chat in MailChimp's Inbox feature, driving lift in customer engagement
- Engineered an AI-powered email campaign editor, shipped to the app's 50K+ daily users
- Launched WhatsApp marketing channel integration in MailChimp mobile, extending reach across a new messaging platform
- Restored UITest suite with modernized mocked architecture, raising test coverage by 25% and reducing regression risk
Senior Software Engineer
Updater | New York, NY | 04/2021 to 06/2025
Managed the Updater app suite delivering end-to-end solutions for the moving industry, including a specialized app for the U.S. Department of Defense.
- Led full redesign and refactor of Updater's iOS codebases
- Introduced modern architecture with SwiftUI + Combine
- Delivered 30% greater conversion rate via A/B tested feature rollouts
- Implemented robust CI/CD pipelines for mobile team
- SwiftUI build of HSCGO app for U.S. Armed Forces and DoD civilians
Principal Application Developer
Reatro Ventures, LLC. | Boca Raton, FL | 12/2017 to 04/2021
Lead developer of mobile applications for Reatro Ventures, working with a close-knit team to implement ideas and bring them to life on the app store.
Some examples of apps released:
- Emvite: Emoji based social media
- I Heart Mac & Cheese: Fast casual restaurant app
- PickleJar: Live performance tipping
Notable Projects
MailChimp
Industry leader in managing marketing campaigns with 50K+ daily active users. Implemented high-impact, AI-first features.
HSCGO
SwiftUI app for U.S. Armed Forces and DoD civilians' moves.
Education
Bachelor of Science in Computer Science
Palm Beach Atlantic University, West Palm Beach, Florida | 12/2014
Honors: Computer Science Club Treasurer, Community Service, Winner of the Palm Beach Atlantic computer game programming contest for 2012
High School Diploma
The American International School of Zagreb, Zagreb, Croatia | 05/2011
IB Diploma (International Baccalaureate), GPA 3.7
Honors: Student Government, Intramural Basketball, Community Service