Experience

Cellum Group

• IT Services and IT Consulting
• 1 - 100 Employee

• • Oct 2012 - Present

  - Designed and implemented backend processes for Mobile Payment platform as part of an Agile team. Enabled Mobile Applications to securely store data, communicate with partners and execute long-running payment processes (using .Net, ASP.Net, Workflow Foundation, Entity Framework, Enterprise Library, NLog, Unity Container, Autofac)- Planned and introduced Event Sourcing and CQRS methodology to achieve better scaling and looser coupling (using Event Store and MSSQL Service Broker)- Helped to create security-aware solutions by applying best practices, implementing cryptography and integrating to Hardware Security Modules. Supported PCI DSS certification (using PKCS, Network and Cloud HSMs)- Integrated to partner systems using diverse protocols and standards (using WCF, SOAP, REST, XML, Json, HTTP(S), or low level protocols like TCP and Base24)- Maintained and continuously refactored legacy codebase to meet modern coding standards and clean code principles- Implemented and fine-tuned CI processes with automatic build, test and deployment (using Git, SVN, Jenkins, Docker)- Continuously researched and investigated new technologies and methodologies Show less

• • Jan 2001 - Oct 2012

  - Designed and implemented remotely manageable Javacard applications for SIM cards and their backend server components. Developed low-level communication and cryptographic solutions- Developed flexible and performant Over-The-Air SIM Card management server- Implemented extensible SMS Communication Gateway to connect to multiple 3rd party SMS Services- Studied and applied industry standards (e.g. GSM and OMA)