• Leading the tech department and helping from the technical side to the successful raising of Series A and Series B funding rounds of total 24 Million USD (eVentures, Graycroft)• Building the engineering department from scratch up to 25 people (iOS, Android, Backend, QA, Engineering Managers) • Setup high performing mobile teams and processes to achieve WEEKLY releases for the iOS and Android apps• Foster and nourish an extreme a/b test culture in the engineering team, everyone aligned to the idea: if a feature is not good for the user or the business, the feature doesn't stay• High attention to quality of the app updates - despite the rapid development - achieving crash-free for the 99.7~99.8% of the users• Launching the app globally, in 6 different languages and on iOS, Apple TV, Apple Watch, Android, Web

• Design and building advanced applications for the iOS and tvOS platform‌• Developming apps for hardware devices using the Bluetooth Smart ( BLE ) stack‌• Collaboration with cross-functional teams to define, design, and ship new features.‌• Unit-testing code for robustness, including edge cases, usability, and general reliability.‌• Working on bug fixing and improving application performance.‌• Continuously discover, evaluate, and implement new technologies to maximize development efficiency.‌• Development of backend systems for communication with the apps

• Research and development: Implementing novel solutions in cooperation with the industry in the area of smart grids.Projects : Voltage and Frequency Measurement Plug and Mobile App A metering system was developed that uses the home-outlets as measuring points. A prototype plug adapter has been designed. It measures the voltage and frequency, sends the data to a smartphone which after some preprocessing submits it to a central server for further evaluation. Please find my paper in IEEE conference : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7007671ProAktivnetzEnergy Forecast: Development of methods for calculation of energy production from distributed generators such as photovoltaics or hydropower by using weather forecast. In the case of energy production forecasts for hydroelectric power plants,a neural network was developed and trained by having as inputs historical and statistical data as well as weather forecasts for rainfall, snowfall, humidity and temperature with the help of weather forecasting company.SmartLVGridsTo assess the mutual influences between the electrical power grid on the one hand and the communication system from Smartmeters on the other hand, a co-simulation architecture was developed. Also the development of the methodology in which the components of communication and power simulation are coupled. For the communication simulation, real data from Siemens smartmeters were used• Project management. Define requirements, analyse and divide roles, supervise implementation, redact reports and deliverables, write and present publications on the topic.• Publication of scientific papers on the topic of smart grids.• Supervising and guidance of several students for the writing of their bachelor or masterthesis.

Full stack development from scratch of one of the top 5 classifieds-ads websites in Greece,Frond end design, backend development.SEO strategy and implementationSupervision of the design and the user flow