Microservices solution architectureBig Data solution architecture

- Lead Architect for a complex Call Control Service for Voice, SMS and MMS services; coordinated and reviewed the work of a team of architects; created main documents; created and documented high level architecture, call control flows, functional and non-functional documentation; main technincal expert on the project- explorations and proofs of concept for big data based applications: stack installation and configuration, subscriber churn prediction analysis, design of a distributed processor for big data CSV like files, various applications on top big data storage such as clustering customers based on various consumption attributes, classification, regression, visualization - presales estimations and consultancy- design of an MVNE platform including OCS and related service handlers and integration with the MNO for: voice, data, sms charging protocols, ussd applications, SMSC interaction over SMPP, file exchange, web service integration layer - architecture and design of call completion JAIN-SLEE services integrating network elements such as MSC, Voice Mail and SMSC in order to provide subscribers with missed call notifications- architecture and design of On-Line Charging System for MVNO deployments, handing voice, data and SMS charging. Scope includes network integration design over Diameter, rating and charging logic updates, OCS provisioning and management layer adaptations.

- design of high performance JAIN-SLEE services- development of JAIN-SLEE resource adaptors that enable access to various protocols for services- development of JAIN-SLEE services that implement specific telecom business logic- acting as project expert, offering guidance to other engineers- product support during acceptance

- maintenance and development for a set of applications regarding provisioning of subscribers and bonuses in the rating and charging system, SMS notification and periodic renewal- development of tools for migration from older to newer systems- business logic implementations using a rule based engine- development of protocol conversion filters used to integrate the mediation platform with the client’s deployment- development of various HLR and IN simulators in various projects used for internal testing- development of billing system interfaces between a mediation platform and IN- installation and configuration of virtual or physical machines to support development and testing activity including OS, database server, mediation platforms, SS7 stack- bug fixing and L3 support

Associate Lecturer (2010 – present)Collaborator of IT&C Security Master, holding courses on:• Software Design (UML, Design Patterns)• GSM Mobile Applications (GSM Network/SS7 emphasis)Assistant Professor (October 2005 – October 2010)• Seminars and laboratories on disciplines: Windows Applications Programming (C#),Mobile Device Programming(Windows Mobile - C#, Java J2ME), Data Structures (C++), Object Oriented Programming(C++), Assembly Languages (x86 ASM)• Assignments as a team member in research projects including: software development using .NET Framework and C# language, software design, technical and scientific paper writing, contributing to delivery on time and within budget.