Dan Bodnar

A podcast application, built entirely with reactive paradigms (using the Combine framework) and UIKit, using an MVVM architecture. I was the sole iOS developer in charge of every aspect of the application, including the audio player (built over AVFoundation), local persistence for offline use (Core Data), and back-end communication and the IAP system.

An innovative and modern application built to deliver personalized oral care activities, progress tracking, and more. The application connects with Bluetooth Low Energy (BLE) toothbrushes and guides the user to brush better every day. Delivering high-quality, secure, and well-tested code was the most important development aspect. The entire development process was rigorous, and the result was very satisfying: a reliable application that is very much appreciated by its users.

An iOS application designed for oral health care. The app connects with BLE toothbrushes to provide coached brushing, related activities, and easy tracking of users' oral health progress. Producing high-quality, secure, and well-tested code was the most important development aspect. The entire development process was rigorous, and the result was very satisfying: a reliable application very much appreciated by its users.

SOLUTION
A therapy system motivates stroke patients to train their arms and regain arm mobility. The system consisted of three key parts: the BLE wrist device, an iPhone client/user application, and an iPad application for doctors. Both applications were paired with BLE wrist trackers that provided arm movement information.

CHALLENGES
One of the project's biggest challenges was that the iPad application had to easily pair with an unlimited number of peripherals and hold and work with up to five active connections simultaneously. Due to the nature of the project, the data could only be stored locally, and a peer-to-peer synchronization system between the user app and the doctor app had to be developed.

ROLE
As the technical leader in a team of three, I made high-level technical decisions. I proposed and implemented an MVVM and C project architecture with an n-tier layout (six dynamic libraries). I developed the BLE communication layer, the multipeer connectivity layer, the AirPrint services, and many others. I also ensured that the Git flow is respected (trunk-based), that the pull requests are correctly reviewed, and that the project's code coverage doesn't drop from one pull request to another.

A SwiftUI and Combine application serve as a POS terminal for a chain of bakeries. We built a pixel-perfect iOS application that offers a modern and reactive experience and can work fully offline. The back end and the API communicate with the app, the synchronization system on the app, and the SDK that communicates with the printers. I led the development of the entire system.

A Swift SDK used in an iOS-banking application to authenticate users based on their biometric passport information. I led the development of a solution that used basic access control to read and authenticate passport information. Once the reading was done, the information was passed to other application layers. The main challenge of this project was the lack of documentation.

SOLUTION
An offline-first application that manages the colony data in research laboratories. In a team of two, I developed a large part of the application, mainly, but not limited to, the local storage system (with Core Data) and the app side of the synchronization system.

CHALLENGES
The biggest challenges were to make the app fully functional offline and allow a reliable synchronization with the back end for large chunks of data in limited and poor internet conditions.

SOLUTION
An iOS application for indoor localization and an indoor mapping system. The main feature of the application was to present a map of the inside of a building, hall, or showroom; position the user on that map in real time, and draw a route to a point of interest. One of the app's clients was Tranoi, a leading fashion trade show in Paris. Using the app, users could easily find their way through different showcases and the route to the next one they wanted to visit.

CHALLENGE
The biggest challenge was to triangulate the user location using the iBeacons placed inside the hall.

ROLE
As the technical leader in a team of five, I spearheaded all the design choices and developed a large part of the triangulation system and most of the graph algorithm to find the shortest paths.

In its fourth version, Plus Workout was a successful iOS application that was highly ranked in the health and fitness category of the App Store. The main goal of the app was to help (indoor) cycling enthusiasts achieve their goals during their workout sessions. As the sole developer, I created the app from the back end, database, and API to the front end.

A Swift application for nightlife in Paris. The main feature of the application was to present a map with different nighttime activities. I developed the entire app, using the Mapbox framework for the mapping system and Parse for cloud storage.

SOLUTION
An iOS application for creating and sharing videos from photos. All videos were presented in a feed (collection) where any app user could play them.

CHALLENGE
The main challenge of the application was to create a mechanism to load and play the videos in a fast and reliable way.

ROLE
I created the two key features of the application: the video creator, which included filters for photos and background music, and the video feed.

A video editor that allowed the user to modify an existing video by adding their voice on top of it and also to synthesize their voice. I developed the entire application, including the voice synthesizer, using only iOS core frameworks and no third-party frameworks.