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Ariel Cornejo

@arielco

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Developer / Data Engineer / Support Engineer. Specialized in ETL pipelines, database performance, and automation.

Venezuela

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At DBA-on-Call, I design and implement automated ELT pipelines across PostgreSQL, MySQL, SAP SuccessFactors, MongoDB, and Databricks. I also designed a full PostgreSQL database migration to Databricks, including schema conversion and data integrity validation.

As a Freelance Developer, I delivered automation, data cleanup, and API integration solutions, and built reusable scripts for data transformation and validation.

At Digitel, I supported and enhanced mission-critical prepaid billing systems. I created Python and Flask REST services for a mobile payment solution over USSD, and ETL flows that cut load times by 80% while bringing the failure rate to nearly zero.

Experience

Work history, roles, and key accomplishments

Current

Data Engineer

Current

DBA-on-Call

Jun 2023 - Present (3 years 4 months)

Designed and implemented automated ELT pipelines for data integration across multiple databases and Databricks. Automated database monitoring, maintenance, and alerting using Bash and Python.

PostgreSQL MySQL SAP SuccessFactors SOAP REST MongoDB Databricks PySpark BASH Python ELT Data Integration Data Validation

Freelance Developer

Self Employed

Dec 2021 - Feb 2024 (2 years 2 months)

Delivered automation, data cleanup, and API integration solutions using Python, PowerShell, SQL, Bash, and PHP. Built reusable scripts and tools for data transformation and validation.

Python PowerShell SQL BASH PHP Automation Data Cleaning API Integration Regex

Database Developer

KMG

Apr 2022 - Oct 2022 (6 months)

Developed an Oracle DB based back-end for an Intranet application, including the schema and business logic in PL/SQL.

Oracle Pl SQL Database Development Backend Development

Expert Leader, Prepaid Billing

Digitel

Jan 2016 - Dec 2019 (3 years 11 months)

Led support and enhancement of mission-critical prepaid billing systems and associated high-volume data stores. Implemented solutions for monitoring and enhancing existing applications.

Python SOAP WSDL Perl Shell Scripting Pl SQL ETL Oracle Data Pump REST Flask USSD Telecom Billing

Support Specialist / Consultant, Prepaid Billing

Digitel

Jan 2007 - Dec 2016 (9 years 11 months)

Supported mission-critical telecom real-time billing platforms. Developed ETL flows and a preprocessor for call-record files that sped up processing 8-fold.