Erekle Mamulashvili, Developer in Tbilisi, Georgia
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Erekle Mamulashvili

Verified Expert  in Engineering

Software Developer

Tbilisi, Georgia

Toptal member since June 18, 2020

Expertise
SQLOracle DevelopmentTableau DevelopmentETLSQL ServerPostgreSQLBigQuery
Bio

Erekle has 13 years of experience working with Oracle and has been working as an Oracle DBA and PL/SQL developer. He also has experience with MS/SQL and PostgreSQL writing stored procedures, creating ETL processes, and building up reports using Tableau or SSRS.

Portfolio

ZipGO
Tableau, Pentaho Data Integration (Kettle), PostgreSQL, Redshift
Magticom
PL/SQL, Oracle

Experience

  • SQL - 17 years
  • PL/SQL - 14 years
  • T-SQL (Transact-SQL) - 12 years
  • Oracle RAC - 8 years
  • MySQL - 5 years
  • Tableau - 4 years
  • Pentaho Data Integration (Kettle) - 3 years
  • PostgreSQL - 3 years

Availability

Part-time

Preferred Environment

PL/SQL, Windows, Linux

The most amazing...

...project I’ve created was an in-house billing system database structure and objects which works with 2 million mobile and 1 million internet subscribers.

Work Experience

ETL and Tableau Developer

2017 - PRESENT
ZipGO
  • Created the ETL process.
  • Built reports using Tableau.
Technologies: Tableau, Pentaho Data Integration (Kettle), PostgreSQL, Redshift

Senior DBA

2007 - PRESENT
Magticom
  • Developed the database structure, PL/SQL packages, procedures, functions, triggers, and views for OLTP system.
  • Built a logical and physical model for analytical databases and the ETL process to move data from an OLTP database to a warehouse database with necessary transformations.
  • Installed and maintained databases including administration of the database in addition to performance monitoring and tuning.
  • Created strategy for backup copies of data using RMAN, and created a physical standby database, which works parallel to primary and can be switched anytime within seconds.
  • Migrated two Oracle databases, version 9 and 10 to Oracle Exadata 11g, from 11g to 12c.
Technologies: PL/SQL, Oracle

mymagti.com

Subscriber portal for mobile and internet.

Users can control their mobile, internet, or TV service; pay subscription fees; or create automatic balance refilling.

I developed the database structure and database logic side.

Zipgo DWH & Reporting Framework

The data warehouse is running on Redshift database and there are various sources including different relational databases, NoSQL databases, CSV files, Google spreadsheets, and different API’s.

ETL is done with Pentaho Data Integration.

Data visualization tool is Tableau, which has various dashboards.
2003 - 2007

Bachelor's Degree in Applied Mathematics and Computer Sciences

Tbilisi State University - Tbilisi, Georgia

APRIL 2020 - OCTOBER 2021

Oracle Autonomous Database Cloud 2019 Certified Specialist

Oracle

Tools

Tableau, Oracle RAC, BigQuery, Pentaho Data Integration (Kettle), Oracle OEM 13c

Languages

SQL, Stored Procedure, T-SQL (Transact-SQL)

Paradigms

ETL

Platforms

Pentaho, Oracle, Linux, Windows

Storage

PL/SQL Developer, Oracle 12c, Oracle PL/SQL, PL/SQL, SQL Stored Procedures, Database Administration (DBA), Relational Databases, Redshift, PostgreSQL, MongoDB, Redis, Microsoft SQL Server, MySQL

Other

PL/SQL Tuning, Google Data Studio, Google BigQuery

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