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Johann Petzold

@johannpetzold

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iOS Developer with expertise in SwiftUI and app architecture.

France

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What I'm looking for

I'm seeking a collaborative environment where I can innovate and grow, focusing on mobile development and user experience.

I'm an iOS Developer with a strong background in creating user-centric applications. My journey began with a Computer Science degree, and I've since honed my skills through various freelance projects and internships. I thrive on enhancing user experiences and delivering high-quality applications.

At Nostrum Care, I successfully integrated new features and optimized the app's architecture using SwiftUI. My commitment to quality is evident in my rigorous testing practices and continuous improvements based on user feedback. I also founded Prismatic, where I develop innovative applications that leverage machine learning and advanced UI design.

Experience

Work history, roles, and key accomplishments

Current

iOS Freelance Developer

Current

Nostrum Care

May 2022 - Present (3 years 1 month)

Led enhancements and maintenance of the Nostrum Care iOS app, integrating new products and continuously improving the codebase. Spearheaded a complete redesign of the app in SwiftUI, implementing a modular architecture, new API management, and a dedicated Design System. Applied similar architectural advancements to the MWM app, ensuring continuous feature delivery and quality through comprehensive

SwiftUI UIKit Firebase Stripe Xcode Cloud SPM MVVM Alamofire

Current

iOS Developer

Current

Spotr

Oct 2021 - Present (3 years 8 months)

Executed a complete rewrite of the Spotr app in SwiftUI, developing custom map views and an address search module. Finalized the app by building a dedicated Design System package and configuring Xcode environments for flexible deployment. Implemented advanced URL management and conducted continuous maintenance, integrating new features and design updates.

SwiftUI SPM Firebase GraphQL TestFlight MVVM UIKit

Current

Founder and iOS / Full-Stack Developer

Current

Prismatic

Jul 2020 - Present (4 years 11 months)

Founded Prismatic and developed the Draw Filters app, featuring 80+ built-in filters and exclusive AI-powered filters. Led the full-stack development of the Good Morning Earth app, including a Swift Vapor API backend, SwiftUI frontend, and robust DevOps with Docker and CI/CD. Additionally, created a cross-platform JSON Web Token app and managed content for the initial Good Morning Earth app.

SwiftUI Vapor Docker PostgreSQL Redis Firebase Vision GitHub Actions

Education

Degrees, certifications, and relevant coursework

OpenClassrooms

iOS Application Developer, iOS Application Development

Completed a program focused on iOS application development. Gained expertise in building and deploying applications for Apple devices.

Epitech

Computer Science Expert, Computer Science

Studied computer science with a focus on becoming an expert in the field. Acquired in-depth knowledge and practical skills in various aspects of computer science.