Ivan Dimoski - Freelance Java Developer for Hire

Senior Software Engineer

2015 - PRESENT

Truecaller

Maintained and actively contributed to one of the most downloaded (250M+ users) and loved (4.5-star rating) apps in the world - Truecaller: Caller ID & Dialer.
Imported and adapted a large part of the Android AOSP into our codebase.
Developed modules using MVP architecture pattern with full JUnit business logic test coverage.
Contributed to the creation of a lightweight, powerful, and easy-to-use library: TrueSDK.
Estimated newest closed beta Android versions and proposed a suggested approach for adapting our app for the latest OS.

Technologies: Android, Java

Android Developer

2010 - PRESENT

Freelance

Created TweetsPie, a Twitter utility app for saving users time by displaying the best tweets from their timeline. Implemented full Twitter API integration using the Twitter4J library. Wrote a complex sorting algorithm based on the number of retweets, favorites, time elapsed, reach, and relevance to the user (how often the user interacts with the tweet creator). Implemented an exponential back-off algorithm for silent background updates depending on app usage, network connectivity, battery percentage, and charging status. Included an image manipulation feature for circular avatar creation.
Developed the Macedonian Orthodox Calendar Android app, a simple app with a static database for showing religious holidays for the current year.
Created Reagiram.mk, an Android app for taking pictures and sending problem reports to the local government. Designed a push notifications system using Google Cloud Messaging to inform users when their report statuses had changed (processed, resolved, rejected, etc.).
Developed Andbtiles, an Android library for managing, downloading, caching, or harvesting MBTiles and exposing them to external applications via a content provider. The library is available on Maven Central.
Developed reTXT, a multimedia messaging app with full end to end encryption, account management, and device syncing via push messages.
Developed Smoak for Android, an app with OpenGL smoke and fire effects for creating and sharing (anonymous) photos, videos, and texts.

Technologies: Android, Java

Lead Android Developer

2012 - 2014

PlanNow Technologies

Optimized Mobile Survey, one of the most expensive apps on Android, for on-site surveys and network analysis. Implemented Access Point bounding by MAC/BSSID comparison. Improved heatmap/area coverage and route rendering. Limited memory consumption by tweaking image quality depending on screen size, density, and available heap size.
Created the first phase of Shortlist.fm, a Twitter-like Android app for content and media sharing. Implemented full server communication with JSON with Gson manual data caching for reducing network call overhead. Implemented a profile management and avatar creation mechanism to allow users to crop a picture taken with a camera or picked from the gallery.
Developed the Android app for Vuact.com, a powerful video analytics platform. Handled network operation implementation using the Volley framework and the image caching/processing implementation using the Picasso library. Featured fragment-based responsive design with a content display based on the screen width. Included HTML5 iframe video handling.
Created Salama Documents, an Android app for secure document storage in rural African areas, as part of a Stanford University humanitarian project. Implemented functionality for secure account creation, document encryption, password retrieval using HTTPS, SSL certificates, password salts, archive encryption (AES), operator password approval, and photo verification. Included Dropbox API integration. Handled low connectivity by implementing upload/download queues and scheduling.
Created Salama Documents Admin Panel, a Java Tapestry web application serving as a backbone to the Salama Document project. Implemented account management, operator to region mapping, credential management, new version notification, device tracking, and basic usage statistics.

Technologies: Android, Java (Tapestry)

Android Developer

2012 - 2012

ITgma

Created a hybrid tracking app for a network operator using the Android JavaScript interface in a WebView. Implemented the ability to sign in, view account details, check available credit or current balance, view a list of activated and available services, see featured promotions, and view cell phone usage statistics (minutes spent talking to favorite numbers, SMS/MMS count, etc.).
Created a native Android app for real-time embedded soundboard diagnostics and graph tracking. Implemented the I2C protocol via the USB port. Compiled .dll (Windows) drivers as a .so library (Linux) to allow the code to work on Android. Included Android NDK to SDK communication. Implemented graph display functionality for common parameters (gain, excursion, volume, temperature) on both channels.
Laid out the initial architecture and screen layouts for AEK's (Macedonian Agency for Electronic Communication) phone book and calculator apps. Calculated the minimal amount of Android permission required in the manifest file to avoid being considered a sniffing app (it gathers a lot of background data about the phone and network usage) and optimized it to be power efficient.

Technologies: Android, Java

TweetsPie (Development)

https://github.com/TheMedo/tweets-pie

The TweetsPie Android app, a Twitter utility to save users time by displaying only the best tweets from their timeline.

—AWARDS—
Winner, Droidcon Easter Europe 2013 App Challenge
Winner, Mobile App Camp Skopje 2013 App Challenge

Next Web Featured Article (Other amazing things)

http://thenextweb.com/apps/2013/12/04/tweetspie-redesigned-android-twitter-people-really-dont-time/

TweetsPie for Android got featured on one of the most relevant tech sites in the world with an extremely positive review for its minimal design and everyday usefulness.

Winner of Droidcon Eastern Europe 2013 (Other amazing things)

http://ro.droidcon.com/

TweetsPie won the Droidcon Eastern Europe 2013 app challenge held in October in Bucharest, Romania, ensuring its spot among the finalists for the Droidcon in Berlin in April 2014.

Mobile Survey (Development)

http://www.ekahau.com/wifidesign/ekahau-mobile-survey

I worked on one of the most expensive and complex Android Apps for on-site, walk-in surveys, and network analysis. I was a key team member working on Access Point auto bonding and memory optimization using large graphics and overlays.

Tips for Developing an Android App: My Lessons Learned (Publication)

https://www.toptal.com/android/making-an-android-app-lessons-learned

This article provides an overview on building a great Android application, from defining an idea to releasing an application to the store. Toptal developer Ivan Dimoski gives us a chance to learn from his experience in making Ooshies, an Android Live Wallpaper designed to give you a hug and make you feel loved each time you interact with your Android device.

Top 10 Most Common Mistakes That Android Developers Make: A Programming Tutorial (Publication)

https://www.toptal.com/android/top-10-most-common-android-development-mistakes

There are thousands of different Android powered devices, with different screen sizes, chip architectures, hardware configurations, and software versions. Unfortunately, segmentation is the price to pay for openness, and there are thousands ways your app can fail on different devices. Regardless of such huge segmentation, the majority of bugs are actually introduced because of logic errors. These bugs are easily prevented, as long as we get the basics right! Here's a quick rundown of the 10 most common mistakes Android developers make.

Automated Android Crash Reports with ACRA and Cloudant (Publication)

https://www.toptal.com/android/automated-android-crash-reports-with-acra-and-cloudant

Making a basic Android app is easy. But making it reliable, scalable, and robust, on the other hand, can be quite challenging. With thousands of available devices pumped out from tons of different manufacturers, assuming that a single piece of code will work reliably across phones is naive at best. Segmentation is the greatest tradeoff for having an open platform, and we pay the price in the currency of code maintenance, which continues long after the app passes the production stage. In this post, we'll walk through a solution: automated crash reporting with ACRA and a Cloudant back-end, all visualizable with acralyzer.

Frameworks

Android SDK, Dagger 2

Libraries/APIs

Google API, GitHub API, Twitter API, Google Gson, Android API, Retrofit, Picasso, Android Support Library, PayPal API, Facebook SDK, Facebook Open Graph API, Google+ API, Parse SDK, Android Design Library, Firebase Android SDK

Tools

GitHub, Gradle, Git, Android Studio, Bitbucket, Android Debug Bridge, Android Device Manager

Paradigms

Object-oriented Programming (OOP), Model View Presenter (MVP), Android Material Design

Platforms

Windows, Android, Linux

Other

Android Animations, Android Design Guidelines, Android Testing, Android Theming

Bachelor's degree in Information Science and Computer Engineering

2007 - 2011

Ss. Cyril and Methodius University - Skopje, Macedonia