Timothy Rosenvall

Blending code with innovation and ambition

I’m an iOS developer who builds systems, not just apps. My work spans mobile development, backend architecture, and the automation that connects them—because the best solutions don’t stop at the app store.

I’ve spent years working with Swift, SwiftUI, and the iOS ecosystem, but I’m equally comfortable building Express servers, setting up CI/CD pipelines, and architecting the infrastructure that makes mobile apps actually work. I believe in writing code that’s maintainable, tested, and built to last—not just to ship.

I pay attention to the market and strive to stay fully up to date on the latest tech and strategy. I’m not afraid of new tools but I try to find the best to to solve any problem. Whether it’s migrating legacy code to modern architectures, implementing comprehensive test coverage, or building multiplayer game servers on a shoestring budget, I focus on what works over what’s flashy.

I’m driven by the belief that technology should make life better, not just more complicated.

CORE COMPETENCIES

iOS Development & Architecture (Swift, SwiftUI, UIKit, Core Data, HealthKit)
Backend Systems & Infrastructure (Express, Docker, MySQL, Nginx, SSL/TLS)
DevOps & Automation (CI/CD pipelines, Jenkins, Bash scripting, deployment automation)
Testing & Code Quality (Unit/Integration/UI testing, 80%+ coverage, XCTest)
System Integration (RESTful APIs, Firebase, CloudKit, authentication flows)
Team Leadership & Mentorship (Code reviews, scrum facilitation, programmer supervision)
Performance Optimization (App scalability, architecture migration, debugging)
Project Architecture (MVVM, VIPER, clean code principles, technical planning)

Founder & Lead Engineer

Apollo Education • Full Time

July 2024 – Present

Designed and developed a full-stack, cross-platform educational platform using Flutter (iOS/Android/Web) with a custom backend deployed via GitLab CI/CD.
Built backend architecture using Node.js with scalable endpoints and secure user authentication.
Architected internal services for analytics, crash reporting, and entitlement management, abstracted for reuse across future Apollo products.
Implemented modular service bootstrapping and asynchronous processing to ensure maintainability and platform consistency.
Developed an internal toolset for error trace visualization and telemetry logging, designed for privacy-first analytics.
Emphasized long-term scalability, minimal tech debt, and social accessibility as core design pillars.

Software Engineer

Anonyome Labs • Full Time

Oct 2022 – July 2024

Restructured and re-architected the analytics and authentication approach for several applications, ensuring scalability.
Modified existing software to correct errors, adapted it to new hardware, and upgraded interfaces and improved performance.
Worked in an AGILE environment using SOLID and CLEAN coding techniques.
Developed a comprehensive Bash library to automate branding of white-label applications.
Conducted regular maintenance on white-label applications, keeping up-to-date with industry standards.
Conducted code reviews and provided constructive feedback to enhance code quality.
Maintained 80% code coverage with unit tests, integration tests, and ui tests.
Acquired excellent debugging and analytic problem-solving skills through extensive troubleshooting of software applications, ensuring optimal performance.
Consulted with customers and other departments on project status, proposals, or technical issues, such as software system design or maintenance.
Supervised and assigned work to programmers and facilitated scrum meetings.
Prepared reports concerning project specifications, activity and status.
Deployed apps to the app store both manually and using the Jenkins platform.

Software Engineer

Deed Inspection • Contract

Sept 2019 – Oct 2021

Designed, architected, and built a comprehensive inspection app for building inspectors, enabling efficient data collection, organization, filtering, and maintenance.
Developed features for managing inspections including role based access control, scheduling
syncing to Apple Calendar with EventKit, photo and video capture using AVFoundation, and Cloud Storage using Firebase.

Software Engineer

CodeTeam10 • Full Time

July 2019 – Dec 2019

Led the development of a high-intensity interval training (HIIT) app with integrated HealthKit and Apple Watch support, enabling users to track workouts and monitor health metrics in real-time.
Designed and implemented advanced features such as real-time health data recording, workout customization, and seamless syncing with Apple Health.
Designed, architected, and pushed to release a unique wiki-style brain mapping app that allowed users to organize and connect complex ideas using an intuitive interface.
Utilized best practices in Swift, HealthKit, and Core Data to ensure efficient app performance and seamless user experiences.

ADDITIONAL / SELF EMPLOYMENT

Russian Hearts

Freelance / Ongoing

Jan 2023 – Present

Implemented online multiplayer allowing players to compete against each other.
Designed and implemented computer opponents to provide single-player gameplay.
Engineered the core game mechanics.
Created an intuitive and visually appealing user interface using modern design principles and a mix of SwiftUI and UIKit.
Conducted extensive testing and debugging to ensure the app’s reliability and stability.

Arcanum

Open source project

Jan 2020 – Present

Led efforts to migrate the codebase from JavaScript to TypeScript, and from Vue 2 to Vue 3, enhancing code quality and maintainability before departing from the project.
Implemented Unit Tests and updated the CI/CD pipeline to ensure tests were passing.
Updated the UI for better user friendliness.
Cleaned and optimized existing code, prototyping new gameplay features, and conducting thorough code reviews.