Aleksandar Simic

A primary healthcare practice that uses technology and artificial intelligence to deliver a better patient experience at a lower cost with better outcomes for patients. The practice raised over $12 million from various investors, including Y Combinator, Paul Buccheit (Gmail creator), Jawed Karim (YouTube Founder), A.Capital Ventures, and Collaborative Fund, and we were featured on Medium, Forbes, TechCrunch, and Venture Beat.

Since early on in Circle Medical's history, I've worked as lead Android developer with complete ownership of the Java codebase and development lifecycle. I implemented all features, integrated it with various APIs and SDKs, and continuously improved architecture and overall codebase quality by applying Android's best practices, various patterns, and automation tests.

Note: Application may not be accessible in countries outside the USA

An end-to-end system used as a tool to support patients before and after their surgeries through a diverse set of lessons and action items that should be completed over time.

The system consists of various components while the Android application was developed in Java and iOS in Swift. As a lead Android engineer, within a team of eight, I took part in the development of every feature as well as conducted code reviews, fixed bugs, improved architecture, and simplified the codebase.

An end-to-end system that showcased new upcoming seasonal Nike's clothes and sneaker boots, with Android and iOS clients developed in Java and Swift. Featured in Mashable and in "Top Developers" section on Google Play.

As part of the Android team, I developed a large number of custom UI controls, animations, and frameworks for it, handling complex user interaction, big file system handling, and various optimizations.

Note: Android and iOS applications are not accessible anymore through the stores.

A weight loss and tracker mobile application that helps users to make healthy lifestyle changes and motivates them to continue doing so, developed in Java for Android and Swift for iOS.

During the course of two years, as lead Android developer, I've developed multiple new features, such as the food diary and avatar customization, introduction of material design, code refactoring, and continuous improvement to the codebase as the user base grew to over 10 million users.

A coaching diagnostic tool that provides teams with player's key health indicators, measurements from BLE sensors and its interpretation that can help improve individual's performance and training.

As a lead iOS developer, besides adding new features, I've refactored the existing application in Swift, introducing MVVM architectural pattern as well as RxSwift, Realm, and repository pattern. This led toward significant improvements in scalability and speed of BLE communication, smoother UX, and overall stability of the application.

A distributed system for conducting prioritized automation tests and report generation, that allows developers to easily integrate any test tool in it and to perform those tests when needed, thus removing existing dependencies between engineers and test engineers. I've developed and designed the entire system in C# and integrated all existing test tools for PDF to DOC conversion.

The entire system supports saving and restoring state; detection of number of workers online; priorities of different tests; conducting daily millions of tests in multithreaded fashion; automatic generation and emailing of test results, asserts, and performance to the developer who requested the test; and optimizing bucket size based on workers' CPU speed, number of available cores, overload, etc. Tests were doing comparison tests, stability and rendering checks, and more.

A mobile and web application that helps teachers to manage and conduct tests for their students. Its main key lies within image processing algorithms that parse responses and real-time communication between mobile clients, websites, and projectors during tests as well as offline synchronization that ensures that assessment goes smoothly.

I worked as an Android developer for a year, during which I've implemented completely new UI and UX designs, including custom animations and logic around it while supporting new features developed by core developers.

A blend of POS and guest management cloud systems that simplifies managing a restaurant and improves the entire experience for the clients, with a back-end built in .NET and mobile applications in native languages. I've developed a set of custom UI controls for Android application, fixed various issues, and worked on a wide range of features.

The system has two applications: one for clients and one for restaurant employees. Employees are able to handle reservations, process payments and tips, manage orders, generate and email invoices, and even draw floor plans. On the other side, the client is able to search for nearby places, make reservations, order food, tip waiters, and rate their experience.

A fitness mobile application that allows users to buy and track different workout programs over time, developed for Android and iOS platforms. I led a team of five Android engineers during the development of the initial release, where my primary responsibilities were to design an architecture, plan sprints, track development progress, mentor developers, conduct meetings, do code reviews, and constantly improve the development process.

Note: The application is available through the Google Play Store and can be found at:
https://play.google.com/store/apps/details?id=com.fitzapppro.fitzapppro