"staxter" -- a platform providing payment services by a German fintech:- Participation in the development process for several months.- Involvement in the design and implementation of new features/processes, troubleshooting and bug-fixing, and deployments to the staging environment (AWS).- Remote work, cooperation with the team located in another country (DE), full-time.- Technologies: Java, Java Spring Boot, AWS services (e.g. AWS Lambda, Amazon DynamoDB, Amazon SNS, SQS, etc.), Git, Maven, JUnit, Mockito, Jenkins CI, JIRA."Prepaid Voice over LTE (VoLTE) system" at Tier-1 mobile operator in Austria:- Involvement in the design and implementation of services enabling Voice and SMS features for prepaid subscribers via LTE (IMS) network.- Implementation of Diameter SCUR/IEC FSMs with session authorization for prepaid.- Design and implementation of a Feature Executor framework, within the JSLEE TAS, with Java-based API for the synchronous execution of programmable features (‘plug-ins’).- Technologies: Java, OpenCloud JSLEE Rhino TAS and SIS, Diameter, SIP, Git, SVN, Ant, Ivy, Maven, JUnit, Eclipse, Jenkins CI, Docker, JIRA."Automated commissioning system (ChASM)" for Metaswitch' R&D:- Membership in the self-organized Scrum team for several months.- Working on the development of the system for automatic deployments of products from the Metaswitch product portfolio. - Responsible for troubleshooting, bug-fixing, optimization, analysis and prototyping of new features. - Remote work, cooperation with the team located in the UK, Ireland and Spain.- Technologies: Python, Shell scripts, Selenium WebDriver for Java."Megaco Resource Adaptor" for Metaswitch' R&D:- Participation in the design and implementation of an RA enabling support for the implementation of media gateway controller(s) over Megaco, H.248 teleco protocol.- Technologies: Java, OpenCloud JSLEE Rhino TAS, Netty I/O, Megaco, TCP, UDP, Git, SVN, Ant, Ivy, Maven, JUnit, Eclipse, Jenkins CI.

"CCS/VPN/VoLTE system" (50+ servers) at Tier-1 mobile operator in Austria:- Providing maintenance and support (including 24/7 on-call).- Involvement in bug-fixing, software development, scope negotiation, design and implementation of change requests.- Acting as one of Client’s point of contact for system queries.- Responsibility for new software packages release management and remote deployments on reference/production environment."CCS system" at Tier-1 mobile operator in Netherlands:- Acting as 3rd / 4th level support (including 24/7 on-call) for system queries and troubleshooting.- Working in a cooperation (remotely, as subcontractor) with Irish based partner who was responsible for delivery and maintenance of the OCS system.- Involvement in validation of the production deployment changes.- Managing the internal support team.- Technologies: Java, OpenCloud JSLEE Rhino TAS, OpenCloud SIS and Sentinel, Ulticom Signalware SS7, MySQL Cluster, PostgreSQL, Elasticsearch, Logstash, Linux shell, Python, XML/XSLT, SS7, Diameter, HTTP, LDAP, SIP, Git, SVN, Ant, Ivy, Maven, JUnit, Eclipse, Jenkins CI, Vagrant, JIRA, Citrix.Participation in building the Company’s internal support team in terms of technical interviews of new candidates, managing the team, cooperation with HR department, and other related activities.

Cooperation with OpenCloud' R&D:- Maintenance and development of OpenCloud Resource Adaptors (allowing connectivity/access to resources for OpenCloud JSLEE Rhino TAS services): CDR, DB Query, Diameter, HTTP, LDAP, SIP, and SMPP RAs.- Responsibility for design and estimates, tasks assignment (work plan), implementation, troubleshooting, bug-fixing, code review and refactoring, and release scope negotiation and management related to the product.- Remote work, cooperation with the team located in other country and time zone (NZ), full-time.- Technologies: Java, OpenCloud JSLEE Rhino TAS, OpenCloud Scenario Simulator and Editor, OpenCloud Resource Adaptors, SIP, Diameter, HTTP, LDAP, SCTP, SIP, SMPP, Netty, Ant, Ivy, JUnit, Mockito, Eclipse, Jenkins CI, JIRA Agile (Greenhopper), Bitbucket, Confluence, Slack.

Cooperation with OpenCloud' R&D:- Maintenance and development of protocol schemas of OpenCloud Scenario Simulator: SIP, Diameter, and HTTP.- Maintenance and development of OpenCloud Resource Adaptors (allowing connectivity/access to resources for OpenCloud JSLEE Rhino TAS services): CDR, DB Query, Diameter, HTTP, LDAP, and SMPP RAs.- Responsibility for design and estimates, tasks assignment (work plan), implementation, troubleshooting, bug-fixing, code review and refactoring, and release scope negotiation and management related to the product.- Remote work, cooperation with the team located in other country and time zone (NZ), full-time.- Technologies: Java, OpenCloud JSLEE Rhino TAS, OpenCloud Scenario Simulator and Editor, OpenCloud Resource Adaptors, SIP, Diameter, HTTP, LDAP, SMPP, Ant, Ivy, JUnit, Mockito, Eclipse, Jenkins CI, JIRA Agile (Greenhopper), Bitbucket, Confluence, Slack.Participation in internal projects and presales processes in the GSM-SS7 area in terms of design, prototyping, technical support and effort estimation.

"IN Phone" for pan European MVNO:- Maintenance and development of the IN Prepaid Platform, allowing to offer a variety of prepaid services.- Acting as 3rd level live support for system queries and issues detected on design and source-code level.- Responsibility for release management and remote deployments on the production platform.- Technologies: Java, OpenCloud JSLEE Rhino TAS, CAMEL, MAP, Diameter, JBoss, Ant, Maven, XML, SQL, PostgreSQL, JUnit, Mockito, Eclipse."INSwap" NGIN platform for Tier-1 Polish mobile operator:- Implementation of selected call processing services.- Involvement in the implementation of design changes, bug-fixing, and troubleshooting.- Supporting particular deployments on the production.- Technologies: Java, OpenCloud JSLEE Rhino TAS, OpenCloud SIS, INAP, MAP, Ant, Maven, XML, SQL, Oracle/TimesTen, JUnit, Mockito, Eclipse, Jenkins CI.Integration of the Online Charging System, based on OpenCloud JSLEE Rhino TAS with external billing system (Ro interface) through Diameter protocol.Cooperation with OpenCloud' R&D:- Implementation of new protocol schemas for OpenCloud Scenario Simulator tool, enabling support for network protocols: SIP, Diameter, and HTTP.- Responsibility for design and estimates, implementation, and release scope negotiation related to the product.- Remote work, cooperation with the team located in other country and time zone (NZ), full-time.- Technologies: Java, OpenCloud JSLEE Rhino TAS, OpenCloud Scenario Simulator and Editor, SIP, Diameter, HTTP, Ant, Ivy, JUnit, Mockito, Eclipse, JIRA Agile (Greenhopper).

"SAC"/"gSAC" for Ministry of Labour and Social Policy (Poland):- Maintenance and development of web-based Central Statistics Application, supporting public statistics of the Ministry, also used for selected statistical publications of Central Statistical Office.- Design and implementation of new modules, code review.- Design and implementation of the extensible plugin for integration with the Ministry’s external systems.- Remote work, and cooperation with the team located in another city (Krakow), full-time.- Technologies: Java SE/EE, EJB, JSP, Servlets, Struts, JavaScript, AJAX, JBoss, CVS, XML/XSLT, PL/SQL, Oracle/MS SQL Server, Ant, Eclipse.Regional Operational Programme document workflow application for one of the voivodships:- Partial design and implementation of selected modules, used for applying to the programme.- Involvement in unit/integration testing of the selected modules.- Remote work, cooperation with the team located in another city (Lodz), full-time.- Technologies: Java SE/EE, Spring, JSP, JBoss, XML, Maven, Eclipse.

"SAC" for Ministry of Labour and Social Policy (Poland):- Maintenance and development of web-based Central Statistics Application, supporting public statistics of the Ministry, also used for selected statistical publications of Central Statistical Office.- Remote work, cooperation with the team located in another city (Krakow), full-time.- Technologies: Java SE/EE, EJB, JSP, Servlets, Struts, JavaScript, AJAX, JBoss, CVS, XML/XSLT, PL/SQL, Oracle/MS SQL Server, Ant, Eclipse.

"Gandalf" for Ministry of Science and Higher Education (Poland):- Implementation of Financial services of Research and Development application, used for awardinggrants for specific research.- Involvement in the data migration process, maintenance, and design and development of change requests.- Technologies: Oracle Forms and Reports framework, PL/SQL, Oracle Database.