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Reinaldo Duzanski Júnior

@reinaldoduzanskijnio

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Senior data engineer specializing in cloud-native ETL, data platforms, and machine learning pipelines.

Zimbabwe

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What I'm looking for

I seek roles building cloud-native data platforms or production ML pipelines with strong technical ownership, client collaboration, and scalable impact.

I am a senior data engineer and machine learning practitioner who builds scalable data platforms and end-to-end ML solutions. I lead technical design and client-facing delivery, focusing on reliable data ingestion, transformation, and accessibility for analytics.

At Thoughtworks I architected a medallion-architecture data lake on Google Cloud Platform, implementing Dataproc and PySpark ETL pipelines to improve data accessibility and processing efficiency. At Gerdau I crafted pipelines that integrated APIs and SAP sources to produce structured data and reporting for audit use.

Earlier, as a machine learning engineer at ROIT, I automated accounting processes and delivered production ML and deep learning models, participating in Scrum and client collaboration throughout model development and deployment. My background spans cloud platforms (GCP, AWS), data tooling, Python, and SQL.

I bring multi-disciplinary experience from business analysis to backend and full-stack Java development, enabling strong stakeholder communication and pragmatic engineering across distributed teams and global projects.

Experience

Work history, roles, and key accomplishments

Current

Senior Data Engineer

Current

Thoughtworks

Mar 2024 - Present (1 year 6 months)

Spearheaded design and implementation of a scalable GCP data platform and medallion data lake, leading ETL pipeline development with Dataproc and PySpark to improve data accessibility and streamline analytics workflows.

Google Cloud Platform Pyspark SQL Data Modeling ETL Data Lake Data Warehousing

Senior Data Engineer

Gerdau

Jul 2022 - Mar 2024 (1 year 8 months)

Built and operated robust ETL pipelines to source and structure data from APIs and SAP tables, producing tailored reports and data marts that supported audit decision-making and analytics.

SAP SQL AWS Athena Pyspark Databricks ETL Data Ingestion Reporting

Machine Learning Engineer

ROIT

Sep 2021 - Jul 2022 (10 months)

Developed and deployed deep learning and ML solutions to automate accounting processes for Roit Bank, leading feature engineering, model training, and production deployments within an Agile team.

Deep Learning Machine Learning Python scikit learn Airflow GCP)BigQuery SQL

Business Analyst

Citi

Feb 2018 - Jan 2020 (1 year 11 months)

Acted as a liaison between clients and the bank to gather and analyze requirements, translating insights into product specifications that enabled tailored client solutions.

Business Analysis Requirements Gathering Stakeholder Management Client Engagement Documentation

Java Back-End Developer

HSBC Global Technology Brazil

Mar 2013 - Jul 2015 (2 years 4 months)

Contributed to global backend software projects, collaborating with multicultural teams to deliver distributed systems and enterprise-grade services.

Java Backend Distributed Systems Collaboration REST APIs

Java Full Stack Developer

Supremus Solutions

Jan 2011 - Dec 2011 (11 months)

Developed a commercial ERP system for small businesses, implementing modules for cash flow and inventory management to improve operational control for entrepreneurs.

Java ERP Inventory Management Cash Flow Management