Rafael Kawamura, Developer in Wrocław, Poland
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Rafael Kawamura

Verified Expert  in Engineering

Data Warehousing Developer

Location
Wrocław, Poland
Toptal Member Since
November 1, 2021

Rafael has over six years of experience as a business intelligence developer. Being a quick learner, he has worked in various sectors like the government's legal system, the health insurance industry, financial institutions, apparel, and aviation, using various ETL tools like SQL Server Integration Services, Oracle Data Integration, and Azure Data Factory. He has also worked with database technologies like Teradata, Oracle, Microsoft's SQL Server, and Synapse to build data warehouses.

Portfolio

Ryanair
Azure Data Factory, Azure Logic Apps, Azure Synapse, Azure SQL Databases...
Qintess
Oracle Data Integrator 12c, ETL, Teradata Databases, Business Intelligence (BI)...
WTime
Microsoft Parallel Data Warehouse (PDW), SQL Server Integration Services (SSIS)...

Experience

Availability

Part-time

Preferred Environment

Azure Data Factory, Azure, SQL, Azure SQL Databases, Azure Synapse, Oracle Database, Oracle Data Integrator 11g, Oracle Data Integrator 12c, Teradata SQL Assistant, SQL Server Management Studio (SSMS)

The most amazing...

...project I’ve led was the requirement analysis and development of the main data mart for Latin America's biggest court of justice in São Paulo.

Work Experience

Business Intelligence Developer

2020 - PRESENT
Ryanair
  • Worked on the migration of the company's data warehouse from on-premises to a cloud solution.
  • Developed ELT processes to report the pandemic's impact on the company's flights.
  • Crafted the improvement of the company's GDPR process.
Technologies: Azure Data Factory, Azure Logic Apps, Azure Synapse, Azure SQL Databases, SQL Server Integration Services (SSIS), ETL, Business Intelligence (BI), Database Architecture, T-SQL (Transact-SQL), SQL DDL, SQL DML, Blob Storage, Data Modeling, Excel 365, Microsoft SQL Server, Microsoft Power BI, Architecture, Relational Databases, Dimensional Modeling, Data Warehousing, SQL Server Management Studio (SSMS), SQL, Azure, Data Architecture

Senior Business Intelligence Developer

2019 - 2020
Qintess
  • Worked in a multinational apparel company to find a data warehouse solution, building data marts and ETL processes.
  • Integrated Google Analytics logs from web channels to the data warehouse.
  • Migrated SAS programs used for reporting to Oracle Data Integrator 12c.
Technologies: Oracle Data Integrator 12c, ETL, Teradata Databases, Business Intelligence (BI), Database Architecture, PL/SQL Developer, PL/SQL, SQL DDL, SQL DML, Data Modeling, Excel 365, Architecture, Relational Databases, Dimensional Modeling, Data Warehousing, Oracle Database, SQL, Data Architecture

Senior Business Intelligence Developer

2018 - 2019
WTime
  • Worked in one of the biggest health insurance companies in São Paulo on its clinical data warehouse.
  • Defined KPIs along with doctors and developed extractions to improve report accuracy.
  • Improved the primary customer classification process inside the company.
Technologies: Microsoft Parallel Data Warehouse (PDW), SQL Server Integration Services (SSIS), ETL, Business Intelligence (BI), Database Architecture, T-SQL (Transact-SQL), SQL DDL, SQL DML, Data Modeling, Excel 365, Microsoft SQL Server, Architecture, Relational Databases, Dimensional Modeling, Data Warehousing, SQL Server Management Studio (SSMS), Teradata SQL Assistant, SQL, Data Architecture

Business Intelligence Analyst

2014 - 2018
CDS
  • Led the requirement analysis and developed the main data mart for the Court of Justice of São Paulo and was a source for the KPIs sent to the federal institution responsible for supervising each state's performance.
  • Migrated the data warehouse built with Oracle's solution to Microsoft's environment for the Court of Justice of São Paulo.
  • Integrated the leasing data for a financial institution in São Paulo.
Technologies: Oracle Database, Oracle Data Integrator 11g, SQL Server Integration Services (SSIS), ETL, Business Intelligence (BI), Database Architecture, PL/SQL Developer, PL/SQL, SQL DDL, SQL DML, Data Modeling, Excel 365, Microsoft Power BI, Architecture, Relational Databases, Dimensional Modeling, Data Warehousing, SQL, Data Architecture

Court of Justice of São Paulo Data Mart

At the Court of Justice of São Paulo, I developed a data mart to supply the KPIs demanded by the federal institution responsible for evaluating each state's performance. This was mainly to build a solution that bears the complexity of Brazil's legal system and yet allows users to have control in the definition of each metric (due to a high frequency with the change in definitions). I designed a dynamic ETL solution based on parameters that identify the categories of legal processes and the status in their workflow based on the judge's actions.

Cancellation Data Mart for Airline Company

To enable the airline's best reaction to the COVID-19 pandemic, I've built the cancellation data mart, crossing multiple third-party applications that provide the critical information needed to minimize the impact on the revenue and reach the legal obligations on both customers service and transparency to stakeholders.

Online Sales for Apparel Company

I have developed the ETL process and data mart that allowed the company to cross Google Analytics logs with its online sale data, delivering crucial information on programs' effectiveness and customer behavior.

Migration of SAS Programs to Oracle Data Integrator 12c

The Apparel Company decided to terminate their SAS license agreement and requested that everything is migrated in three months. The task of migrating more than 1,000 SAS programs created by business users for daily reports was entrusted to me, although I had no previous experience with SAS. In a tight schedule, I've quickly learned how the code works in the SAS platform and delivered new data marts on a centralized data warehouse solution that allowed everything done on SAS to be reported by the business intelligence team.
2012 - 2015

Bachelor's Degree in Systems Analysis and Development

Instituto Federal de São Paulo - São Paulo, Brazil

Languages

SQL, SQL DML, SQL DDL, T-SQL (Transact-SQL)

Paradigms

ETL, Dimensional Modeling, Business Intelligence (BI), Database Design

Platforms

Azure Synapse, Oracle Database, Oracle Data Integrator 11g, Oracle Data Integrator 12c, Azure

Storage

Azure SQL Databases, Relational Databases, Microsoft SQL Server, PL/SQL, PL/SQL Developer, SQL Server Management Studio (SSMS), SQL Server Integration Services (SSIS), Microsoft Parallel Data Warehouse (PDW), Teradata Databases, Database Architecture, Teradata, SAS SQL, Database Management

Other

Azure Data Factory, Data Warehousing, Data Modeling, Data Architecture, Data Analytics, Business Intelligence (BI) Platforms, Business Intelligence Architecture, Architecture, Excel 365, Blob Storage, Data Analysis, Data-driven Dashboards

Tools

Azure Logic Apps, Microsoft Excel, Teradata SQL Assistant, Microsoft Power BI

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