Summary
Overview
Work History
Education
Skills
Achievements
Languages
Timeline
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Jonas Estepan

New Port Richey,USA

Summary

Senior Business Intelligence Developer with 10+ years of experience designing, building, and optimizing enterprise-scale analytics solutions for large telecom and retail organizations, including Verizon and Staples. Expert in SQL, Snowflake, Oracle, and PostgreSQL, with a strong focus on dimensional data modeling, BI dashboard development (Tableau, Power BI), and performance optimization to support executive and operational decision-making.

Overview

14
14
years of professional experience

Work History

Senior Data Analyst

Newtech S.R.L
, Remote
08.2023 - Current
  • Built end-to-end BI solutions using data from Teradata, Oracle, and Adobe Analytics to support enterprise reporting and analytics.
  • Performed complex SQL transformations and data modeling to create analytics-ready datasets.
  • Developed Tableau dashboards that clearly communicated operational and performance trends to leadership.
  • Collaborated with business leaders to define KPIs and convert analytical findings into actionable strategies.

Senior Marketing Circulation Analyst

Joseki Technologies Inc.
, United States
11.2021 - Current
  • Designed and optimized Snowflake-based analytical datasets supporting nationwide marketing campaigns and customer segmentation initiatives.
  • Developed interactive Tableau and Power BI dashboards to visualize campaign performance, customer behavior, and key business KPIs.
  • Partnered with marketing and analytics stakeholders to translate business requirements into scalable BI solutions.
  • Improved query performance and data accuracy, enabling faster insights and more reliable decision-making across teams.

Senior Business Intelligence

Newtech S.R.L
, Remote
09.2013 - Current
  • Designed and maintained enterprise data models supporting large-scale reporting and business intelligence solutions.
  • Optimized complex SQL queries and database structures to improve BI dashboard performance and data refresh times.
  • Led multiple database migration projects (DB2 and SQL Server to Oracle), ensuring data integrity and continuity for downstream BI reporting.
  • Automated data processes that reduced manual reporting effort and enabled near-real-time analytics for business users.

Quality Assurance Analyst

Newtech S.R.L
, Remote
09.2011 - 08.2013
  • Performed backend data validation and SQL-based testing to support enterprise systems.
  • Developed SQL reports and served as point of contact for testing initiatives supporting analytics and reporting teams.

Education

Bachelor of Science - Computer Science

Universidad Autónoma De Santo Domingo
Santo Domingo, Dominican Republic
02-2013

Skills

  • Tableau and Power BI
  • Dashboard design
  • KPI and executive reporting
  • Snowflake and Oracle
  • PostgreSQL and SQL Server
  • Teradata
  • Dimensional modeling
  • Star schema
  • Fact and dimension tables
  • ETL and ELT processes
  • Data transformation
  • Query optimization
  • Data migrations
  • Data analysis
  • Trend and pattern identification
  • Statistical analysis
  • Agile methodologies
  • Stakeholder engagement
  • Requirements gathering

Achievements

  • Patented System Contributor (2023): Sole database developer for a nationally patented procurement alert system used for real-time risk detection across the Dominican Republic's public purchasing platform.
  • Multiple employee recognition awards for exceptional performance, reliability, and stakeholder support across enterprise projects.

Languages

Spanish
Native/ Bilingual
English
Full Professional

Timeline

Senior Data Analyst

Newtech S.R.L
08.2023 - Current

Senior Marketing Circulation Analyst

Joseki Technologies Inc.
11.2021 - Current

Senior Business Intelligence

Newtech S.R.L
09.2013 - Current

Quality Assurance Analyst

Newtech S.R.L
09.2011 - 08.2013

Bachelor of Science - Computer Science

Universidad Autónoma De Santo Domingo