John Stavroulakis

• Reporting directly to Middleware & DBA Services Team Leader, being part of three DBAs team
• Conducting tests to identify issues and make necessary modifications
• Creating and updating database designs and data models
• Writing and maintaining technical and functional specifications to document database intentions and requirements
• Installing and configuring middleware in Linux environments
• Administering, supporting and monitoring databases by proactively resolving database issues and maintaining servers. Responsible for hundreds of customer databases around globe. Optimizing databases to give better performance
• Migrating Oracle Databases to latest version, apply latest patches
• Migrating Customer's Databases to cloud
• Offering friendly and efficient service to customers, handling challenging situations with ease
• Increased customer satisfaction by resolving issues
• Participated in team-building activities to enhance working relationships

• Reporting directly to Infrastructure Manager, being part of big administrators team, including four DBAs
• Responsible for continuous and efficient operation of company's Databases, that were more than 250 production and development/test databases
• Conducted tests to identify issues and make necessary modifications
• Set up and controlled user access levels across databases to protect important data
• Increased customer satisfaction by resolving issues
• Applied root cause operation break fixes and other proactive maintenance activities to keep services up and running meeting SLAs
• Developed solutions using available tools and technologies and assist in problem resolution by hands-on participation
• Operated in complex, complicated, highly-secure and highly-available, operations environments
• Always followed company's processes and methodologies
• Work well under pressure and proactively maintaining and improving systems operations
• Learned new skills and applied to daily tasks to improve efficiency and productivity
• Install, configure, maintain and troubleshoot Highly Available Databases Oracle RDBMS, PostgreSQL, MySQL, Mongo, MS SQL Server, Elasticsearch & Cassandra
• Upgrade and Patch Oracle databases to latest version/patch
• Migrate Oracle Databases to Exadata Cloud@Customer Infrastructure
• Administering Oracle Cloud Databases
• Designing maintenance procedures and putting them into operation
• Ensuring databases meet user requirements
• Administering Ericsson's Online Charging System (OCS)
• Liaising with Software Vendors' programmers, applications/operational staff, IT project managers and other technical staff
• Managing database security/integrity and backup procedures
• Implementing security measures
• Testing & modifying databases to ensure reliable operation
• Data archiving and replication
• Understand networking standards and best practices
• Develop and maintain technical documentation and intra-company Wiki
• Ensure that service level agreements and objectives are met
• Work on Standby shifts, as needed, including weekends

• Reporting directly to Database Manager, being part of six DBAs team
• Responsible for proper and continuous operation of company's and subsidiaries' Databases. Supporting databases of 52 customers around globe
• Applied root cause operation break fixes and other proactive maintenance activities to keep services up and running, meeting SLAs
• Operated in complex, complicated, highly-secure and highly-available, operations environments
• Always followed company's processes and methodologies
• Install, configure, maintain and troubleshoot Databases (Oracle RDBMS, MS SQL Server, MongoDB, MySQL, and PostgreSQL mainly, plus Sybase and Netezza)
• Managing database user access
• Designing maintenance procedures and putting them into operation
• Ensuring databases meet user requirements
• Liaising with programmers, applications / operational staff, IT project managers and other technical staff
• Managing database security / integrity and backup procedures
• Implementing security measures
• Knowledge virtualization plus Docker and Kubernetes
• Data archiving and replication, using various methods like Multi-Master replication, Active Dataguard, GoldenGate, Always-On, Replica Sets, GTID Replication, Master-Slave Replication
• Work on shifts, including weekends
• Work well under pressure and proactively maintaining and improving systems operations
• Designed and developed analytical data structures
• Increased customer satisfaction by resolving issues

• Worked at Customer Care Department, providing Technical Support via Inbound Calls and emails in English, supporting existing clients on Kaspersky Antivirus products
• Handled 24-29 calls per day to address customer inquiries
• Developed and maintained courteous and effective working relationships
• Participated in continuous improvement by generating suggestions, engaging in problem-solving activities to support teamwork
• Worked within applicable standards, policies and regulatory guidelines to promote safe working environment
• Resolved problems, improved operations and provided exceptional service

• Took part in various IT projects, such as Greek Parliament & Vardas clothing and fashion company, installing, maintaining, upgrading and tuning Oracle databases. Also provided IT consulting services and Internet Marketing consulting
• Administered, supported and monitored databases by proactively resolving database issues and maintaining servers
• Wrote and maintained technical and functional specifications to document database intentions and requirements
• Adhered to set schedules to test databases for flaws and reduce downtime
• Set up and controlled user access levels across databases to protect important data
• Worked with staff to develop and implement procedures to prevent data loss and maximize system availability
• Created and updated database designs and data models
• Increased customer satisfaction, by providing solutions to issues and better database performance
• Increased customer satisfaction by resolving issues
• Actively listened to customers' requests, confirming full understanding before addressing concerns
• Worked with customers to understand needs and provide excellent service
• Identified issues, analyzed information and provided solutions to problems

• As project leader, reported to Technical Manager, supervising subcontractors' teams to deliver to timeline
• Administering, backup & tuning many Oracle instances (databases) including two RAC installations and one stand-by database for disaster recovery purposes
• Servers & server farms were running Linux or Windows 2003, 2008 or AIX OS and Oracle RDBMS
• All production databases work 24x7 on large database installations
• Backup deployment, Disaster site implementation
• Upgrades & migrations to newer versions
• Patching
• Design and installation of new Oracle Databases
• Installation and maintenance of Customer's Oracle databases
• Customers include: General Secretariat for Youth, Citizens' Advice Bureau (www.kep.gov.gr), Ministry of Environment, Energy and Climate Change, many Greek Municipalities, many Greek Prefectures, Greek Ministry of Rural Development and Food, Greek National Intelligence Service, Agricultural Insurance Organization, Naval House and others
• Administration and maintenance of Virtual machines on VMware ESX servers and Oracle Virtualbox
• Senior Linux Administration of Linux servers, in production mode
• Resolved problems, improved operations and provided exceptional service
• Increased customer satisfaction by resolving issues

• Managed educational business on foreign languages and IT
• Worked with European Leader ΕΥΡΩΓΝΩΣΗ as strategic partner
• Put together realistic budgets based upon costs and fees for successfully operating business
• Established and implemented operational structure and revised material and procedures to tailored class material in achieving educational excellence
• Staff training and coaching was ongoing to uphold high teaching standards
• Main business focus was dedication to students
• Offered English, French, German, Italian and Spanish language tutorials, as well as Ι.Τ
• Seminars, being approved by ECDL and KEYCERT as teaching and examination center
• School attained 100% proficiency exam success rate for academic years
• Employed prompt decision-making and in-depth research to resolve issues
• Created and monitored promotional approaches to increase sales and profit levels

• Reporting to IT Manager, supervising team of two junior administrators
• Administering, backup and performance tuning of sixteen Oracle instances (databases) on three SUN-cluster and eight SUN Sparc servers running Solaris OS, three DELL servers running Red Hat Linux O.S plus two Windows 2003 Servers, all running Oracle RDBMS
• Billing database was large database
• All production databases were operating 24x7
• Backup using Legato Networker and RMAN
• Support Digiquant's DCP Dynamic Charging Platform Billing and company's ERP application.
• Exceeded goals through effective task prioritization and great work ethic.
• Increased Department Managers' satisfaction, by quickly resolving issues
• Carried out day-to-day duties accurately and efficiently
• Developed and implemented performance improvement strategies and plans to promote continuous improvement
• Demonstrated respect, friendliness and willingness to help wherever needed

• Reporting to T.O.C. (Technology Operations Center) manager, being part of four DBAs team.
• Extensively trained in Oracle's backup & recovery procedures.
• Used coordination and planning skills to achieve results according to schedule.
• Developed and maintained courteous and effective working relationships.
• Worked to maintain outstanding attendance record, consistently arriving to work ready to start immediately.
• Collaborated with team members to achieve target results.

Main responsibilities included:

• Administering 26 Oracle instances (databases) on three SUN-clusters and nine SUN Sparc servers running Solaris operating system and Oracle RDBMS.
• Data replication to Disaster recovery site using SharePlex application. End user support through SupportWorks application.
• Worked flexible hours across night, weekend and holiday shifts.
• Carried out day-to-day duties accurately and efficiently

• Reporting directly to General Director, supervising three staff members team
• Adjusted project plans to account for dynamic targets, staffing changes and operational specifications
• Guided organizational technology strategy and roadmaps
• Assisted in development of long-term strategies to grow department and resources
• Main responsibilities included:
• Execution and follow up of administrative activities for smooth flow and efficient functioning of company's I.T Department, mission preparation, planning and organizing I.T Goals
• Guided organizational technology strategy and roadmaps
• Coordinated technical training and personal development classes for staff members
• Wrote policy, procedure and manuals governing internal IT use
• Design and installation of new Oracle Databases
• Supervision of accurate delivery of projects and billing execution procedures
• Technical support to affiliated fueling stations, that gradually increased to 86
• Managed network and system performance, conducting troubleshooting, security patching and maintenance
• Support of SEN E.R.P and Cognos reporting software

• Worked on VMS operating system running on computers owned by Greek Lottery Organization, reporting directly to Technical Support Department Manager
• Main responsibilities included:
• Administering one five-node VAX cluster and one two-node ALPHA cluster on 60 dual path disks storage
• Management of complex networks including Decnet, Lat, TCP/IP, X.25 protocols, ISDN and HellasCom WAN devices
• Oversaw file system and storage upgrades while safeguarding data integrity and redundancy.
• Worked in shifts, to support 24hours operation of IT infrastructure
• Designed proactive preventive maintenance schedules to prevent unnecessary downtime and hardware faults
• Monitored temperature and power draw to immediately detect faults and failures