Architect and implement new data warehouse platform and real-time data streaming in AWS Cloud using Redshift for DWH, S3/EMR/Spectrum for Data Lake, DMS/Kinesis/Kafka and Lambda for real-time data streaming, AWS Glue/Spark/Python for ETL, Tableau and Redash for data visualization and reporting. Implement data quality and security (GDPR) processes, data dictionary and glossary.

Assit technical team with the migration of data warehouse from Oracle to PostgreSQL in AWS Cloud. Trained team with best practice working with PostgreSQL. PoC for PostgreSQL in AWS. Developed ETL process for data migration. Developed optimal logical data model in PostgreSQL. Designed and implemented the high availability architecture for PostgreSQL.

Architect and development of data warehouse in AWS Redshift. Assist technical teams with the best practice, migration process and performance improvement. Developed logical data model for data warehouse and developed ETL processes for data migration and ingestions.

Supporting client’s database environments:

• Data architecture and design, logical and physical modelling.
• Maintaining database environments, backups and performance monitoring.
• Client’s assistance with their data and database projects, best practices.
• Databases version upgrade and patching

Lead Databases Expert in migration project from Oracle to PostgreSQL. Architect and designed the migration process, assisted development team and final client. Maintained previous database environment Oracle RAC and JBoss Applications.

• Architect and implement the PostgreSQL Cluster by Patroni, implemented data and structure automatic migration process.
• Converted and tuned SQL statements and PL/SQL from Oracle to PostgreSQL.
• Implement PostgreSQL monitoring, identified metrics and defined alters.
• Maintained Oracle RAC environments, applied application schema changes and data copies.
• Supported development team on best practices and guided in migration to PostgreSQL.

Lead Data Warehouse Architect and Database Engineer for IoT System development project. Design, develop and maintain highly scalable and high-volume Big Data Platform in Amazon Could (AWS). Develop new data lake based on S3/EMR, Redshift, Spectrum, RDS PostgreSQL, Aurora and Java/SQL API. Migrate 40TB of data from on-premise legacy data platform based on Hadoop HDFS/Hive and Teradata to AWS, include data re-modeling and conversion. Develop data pipelines / ETL processes for daily and real-time data ingestions. Design and develop scalable and high-volume Data Warehouse on Redshift Cluster for advanced analytics and customer facing business intelligence.

• Develop data ingestion processes by Spark and Lambda to convert data files to ORC format.
• Designed and develop SQL/Java API and implement Redshift Spectrum to read data from Data Lake.
• Design and develop data warehouse on Redshift and Aurora Clusters, include data model (Data Vault/3NF) and logical/physical modelling for best performance, flexibility and high availability.
• Assist developers/product owners to identify backend processes and their KPI’s/data requirements.
• Develop ETL processes to feed facts data including filling data gaps in point of time for times series data, units of measure conversion, advanced analytical calculation, data quality/consistency check.
• Review and approve SQL statements of developers and assist in improving the efficiency of the code and SQL Framework/ORMs for best performance, guide developers on best practices using DB.
• Tune Redshift Cluster and Aurora/RDS PostgreSQL, configured Workload Manager for performance improvement, implement the high availability and disaster recovery solutions.
• Support various development teams, stockholders and product owners with data requirements.
• Collaborated with teams in US and India, to learn business models and data requirements.

Conception and implementation of Data Warehouse system based on PostgreSQL including ETL processes by Talend and reports/data visualization by Tableau. Analysing and evaluating the requirements and business processes, identifying KPI and business data measures, designing dimensional model in continues integration environment (Scrum).

• Analyzed and defined the business processes (events) and their data-driven decisions.
• Designed the dimensional model according to required reports and business processes.
• Defined and developed Talend ETL processes to load dimension data and calculate measures/facts.
• Designed the physical model by choosing appropriated hardware, servers and tools.
• Implement tabular and visual reports, defined workflow and deployment process to Tableau Server

Manage Database Team and related projects, lead the successful delivery of complex IT Infrastructure and business solution projects from planning, design to implementation. Defined the work processes, technologies, policies and standards to provide efficient support and projects delivery.

• Implementation of Data Warehouse and BI solution, defined reports and data monitoring requirements, performed logical/physical design and data modeling, defined and developed ETL processes, developed dashboards, data visualization and tabular reports. Used technologies: SQL Server 2016, SSIS, SSAS, Tableau, DWH design and model by Kimball
• Develop and implement the databases backups to Cloud Storage (Amazon S3/Glacier), defined backup strategy to provide high availability and disaster recovery, developed backup procedures to backup databases and upload to cloud storage with history retention and validation.
• Infrastructure consolidation: Merged database servers and instances, clean databases and improved data flow processes (ETL, SSIS), provided capacity planning in order to reduce infrastructure resources usage (Storage, Network Traffic, Servers and Licenses).
• Build monitoring system by Zabbix to monitor infrastructure, availability and business data metrics.
• Data migration projects: supported data migration projects to partners Data Center, with data conversion, defined and developed procedures for business data migration and security

Managed more than 100 high transactional mission-critical production database environments

(Oracle, SQL Server, MySQL) and DWH/ETL processes.

• Implemented backups for high transactional MSSQL 2008R2 Servers with storage in Amazon S3, developed automatic procedures for transaction log maintenance.
• Implemented new ETL and BI procedures by Pentaho and automatic ETL processes in Perl
• Developed BI and Reporting environment based on Amazon Redshift and Tableau, implemented automatic data uploads to AWS by using S3 API in Perl.
• Tuned MSSQL Servers for performance improvement and efficiency, optimized databases to meet high availability requirements
• Participated as lead DBA in MSSQL Servers virtualization and databases merge, provided capacity planning, database scalability for performance impact of data volume growth.
• Implemented Oracle backups by RMAN, and replication to standby environment by Data Guard
• Managed Amazon AWS environments, S3 storage, RDS instances, EC2 Servers and Redshift
• Administrated Hadoop Cluster, designed data models and Map Reduce data aggregations, data loads
• Managed MySQL Master to Master cluster with MySQL MMM Control and Load Balancer
• Managed Problem, Incident and Change tickets, and implemented/monitored database changes

Managed large-scale mission critical OLAP/DWH/ETL Databases Environments and Business Applications, provided daily operations for Front/Backend Office and overall infrastructure environment

• Managed Oracle RAC 10.2 with Oracle ASM on Solaris 10 and EMC Storage's
• Administrated MS SQL Server 2000 with merge replication on Windows Server 2003
• Lead MS SQL Server migration to version 2008, include DTS rewriting and SSIS development
• Provided Incidents, Defects and Change Requests Management, Development and Implementation
• Performed Database Clones by RMAN Images, developed automatic data sync by Data Pump
• Administrated Oracle ASM storage disks, provided capacity planning, managed large database partitions, administrated regular data cleanup.
• Maintained mission critical ETL processes, tuned for performance improvement, efficiency enhancements and high availability.
• Manage large data conversions and migrations, developed automatic data feed extracts and loads.
• Provided Performance monitoring and tuning for applications processes, complex queries and reports
• Managed Back/Front-end Applications and Automatic Reports, developed complex SQL queries
• Administrated Glassfish Application Server; provided troubleshooting and debugging by SOAP.
• Assisted and Maintained implementation and migration process for a new BI and Back-end System.
• Provided System exercises for a new project, assisted management on infrastructure and application issues, provided architecture design and data modeling.
• Assisted R&D team on best technical practices, supported developers and QA teams

Technical Lead and Senior Database Expert in R&D project of IaaS Cloud Management Software.

• Manage projects implementations and development activities, prepared and implemented a planned set of activities to achieve the projects scope to timescale and quality specification.
• Assisted Sales Team with the project’s technical concept and provided the products demonstrations.
• Designed and facilitated the expansion and improvement of the applications architecture and its components, build and maintain methodologies and technical procedures.
• Provided expertise to identify and translate system requirements into software design and functionality, modeling the transactional workloads and consistency architecture.
• Developed and implemented advanced database replications (mostly Oracle to non-Oracle) based on Log Miner, Oracle Streams/XStreams and Redo reading/parsing.
• Designed and developed the Oracle SQL Statement Parsing by ANTLR/Java with data conversions.

Lead Oracle DBA and Infrastructure Expert in On-Going Support Team for Telecom Billing, Customer Management and CRM Systems. Responsible for delivery of consulting/technical services throughout all phases of the project lifecycle from conception, planning, implementation, post-implementation and through to production.

• Managed, monitored and administrated Oracle VLDB in 24/7 complex mission-critical environments.
• Ensured production availability, performance and stability
• Administrated Oracle RAC with ASM on EMC storage and Databases on VERITAS cluster
• Maintained Data Guard environment, re-configured replications for efficiency enhancements
• Managed DWH, tuned ETL processes for data availability and performance improvement
• Administrated production databases weekly clones by EMC-BCV, implemented data encryption.
• Performed backups and recovery by RMAN and VERITAS, adjusted backup plans for high availability
• Provided database optimizations/adjustments according to business and applications requirements
• Reorganized database storage's and resources, provided regular capacity planning and cleaning
• Responsible for revision and deploying database changes, SW patches and releases.
• Provided database logical/physical structure troubleshooting, supervised on structure/data changes
• Configured database security and auditing according to SOX compliance.
• Developed and maintained automatic data conversion from MS SQL Server to Oracle Databases.
• Implemented various infrastructure tools for automate database processing and better utilization's
• Assisted with application design and data modeling, provided technical consulting expertise.
• Developed PL/SQL procedures, provided debugging/revision, assisted developers on best practices
• Provided basis tuning and revision to developers on their SQL queries and PL/SQL codes
• Analyzed complex issues; improved and adapted new methods and techniques
• Responsible for Software Configuration, administrated daily builds and deployments.
• Administrated application versions releases, deliveries and production deployment.
• Provided Incidents, Change Requests and Problem management for internals and client platforms
• Performed performance analyzing and tuning for various OLTP applications and batch processes.
• Supervised on naming conventions and documentations of all the topics related to overall team activities.

Application and Infrastructure technical support for various Telecom Billing customer delivery projects.

• Provided full application life-cycle support in production and R&D projects for various European and Asian Large Telecom customers
• Ensured successful delivery of solutions to technical expectations, including high availability, efficient code usage, application releases
• Prepared logical/physical models for new projects include capacity calculations and growth planning.
• Tuned OLTP/Batch applications processes/databases for performance and efficiency enhancements
• Prepared and deployed database backups/recovery and fail-over strategies.
• Managed application versions, performed revision and deployment of data and structure changes
• Developed scripts for production upgrade and patching, managed data conversions by Data Stage.
• Installed new Oracle software on various platforms; Build and configure databases and network.
• Configured databases and UNIX servers according application requirements
• Managed database clones for PET systems by EMC-BCV.
• Managed internal and external data feeds, responsible for Data Integrity and Quality.
• Developed, maintained and tuned infrastructure tools for QA and R&D teams.
• Mentored and provided oversight and backup for the production environments.
• Produced and maintained documented operational procedures and diagrams (ERD).
• Assisted with the design, development and maintenance of the application support tools.

Served as Oracle Professional for varicose IT Infrastructure projects.

• Provide architecture, consulting, and implementation for database availability and tuning projects.
• Designed and implemented database backup and recovery by RMAN and Hot/Cold methods.
• Maintained RMAN repository and implemented high availability architecture.
• Participated as lead DBA in Oracle migration projects
• Evaluated applications for a new Oracle version, analyzed risks and impacts
• Tuned databases and application processes for performance improvement as post migration phase
• Reorganize database storage’s, maintained table spaces and database resources.
• Designed and setting up standby databases for high availability improvement.
• Administrated Oracle products, installations, patches and upgrades
• Managed UNIX Solaris OS, partitioned and mounted disks, configured network and SAMBA
• Developed scripts for automated data processing and control in Perl and UNIX Shell scripts