Patryk Matuszewski

An open source solution to integrate IoT into Ethereum where I am working on the contracts' implementation as well as the general idea.

I was working on the ORM-like solution to provide functionality handling advanced filtering or searching rules for the data synchronized with the back-end. The solution had to be effective because the app processes the massive amount of the data on the client side. Also, I helped the client to decide what solution will be the best in this particular context.

We (four members in a team) tried creating software to support management of LED ad banners on the streets. We wanted to connect banner owners with advertisers and create a new way to increase profits. The project won a B2B award on Startup Weekend Poznan (2011) but was cancelled due to lack of funding after a year.

- Led a four member team.
- Handled business analysis for the project.
- Made pitches for investors.
- Implemented the back-end using cutting-edge technologies (Symfony 2, PHP 5.3, MongoDB).
- Created a suite of full automatic acceptance/unit tests (Behat, PHPUnit).
- Implemented a mobile client (Android SDK 2.3).

I worked on the Android mobile app for one of the most recognized newspapers in the world. My major goal was to reduce a number of bugs (the first version of the app had a couple of thousands crash reports on Crashlytics).

To achieve that, we improved the automation testing process (added more unit tests, fixed existing one), fixed all memory management issues (like invalid bitmap processing, lack resources cleaning) and identified all use cases which can cause problems. At the end of the project, the number of crashes were reduced about 70-80% and the app started getting more positive reviews in Google Play Store.

I created an Android 3.0 application on tablets to support audit stores for a global performance improvement company.

- The application contains questionnaires that are created dynamically by a server-side application and are needed to implement an optimal solution to exchange data between a server and web application.
- I needed to create a robust software architecture to support multiple pages and dynamic views with extensive user input support (open, close, multiple-choice question, and camera support) and multimedia support (video player, etc.)
- I implemented support for many types of tablets (Samsung, Sony, Asus).

Worked for the largest VOD-content delivery company in the world to improve the existing system and implement new functionality.

Technologies: Java SE, JEE, Spring, XML, XSLT

Created an Android application for a Polish startup allowing users to find a nearby medical specialist.

- Led a three person team.
- Conducted business analyses with the customer (created a list of features, wireframes, and a domain model).
- Prepared a specification of a back-end API that was needed to communicate between an Android app and a back-end server (used RESTful best practices).
- Handled project management using Agile methodology and TDD.
- Implemented the application using cutting-edge Android technologies (API 4.1, AndroidAnnotations, RoboGuice, Robolectric).

I created a web platform for analyzing mobile application stats. We needed to create a complex solution to gather statistical information from many kinds of mobile applications (e.g., how much time users spend on each page or how many times users click on a banner).
- I implemented a library to communicate with a back-end API for J2ME. It featured optimized operations for low-memory devices and support for a wide range of mobile phones.
- I created a MySQL sharding module for a back-end system (PHP 5.3, MySQL). It required a scaling feature for a growing numbers of users and applications.
- I implemented a dynamic web interface on the user side (stats are updated in almost real-time).

Created a PHP application for a small sports company to support management football (soccer) leagues.

• Architected the app
• Deployed a small iterative process to control requirements changes
• Implemented the app based on the project and client requirements
• Set up a production environment (Apache 2, PHP FPM, ACL, MySQL)

Technologies: PHP 5.3 + Doctrine + Zend Framework 1 + Facebook API, jQuery, PHPUnit

Created an application to support and manage tax refunds in the UK

- Worked directly with the client to settle all requirements
- Implemented a small iterative development process to handle changes
- Architected the app
- Implemented the app based on existing law regulations
- Set up a production environment (Apache 2, Nginx, PHP FPM, MySQL)

Technologies: PHP 5.3 + Doctrine 2 + Zend Framework 1 +
Doctrine 2 + Zend Framework 1 + jQuery + PHPUnit

I created a quiz application for an airline related company (Tech: Java 1.4, BlackberrySDK 6, Facebook API, JS, HTML). During the project, I needed to learn a completely new SDK and use this knowledge in a business environment.

- The UI implementation (JavaScript, HTML) is based on existing wireframes and included support for many types of devices.
- I created a library to communicate with Facebook API in Java 1.4. I needed to use a limited edition of Java specifications to create a robust solution to support many user behaviors, such as image uploading, adding texts to the Wall, inviting friends, and sending messages to friends. The application worked on 3G.

An Android 2.2 news feeder for one of the biggest broadcasting companies in the world. I needed to include support for an Arabic language-based device and fixed bugs in the existing legacy code.