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Oscar C.
Senior Data Engineer
Oscar is a highly specialized Senior Data Engineer with 13 years of commercial experience. He has worked in diverse industries such as AdTech, FinTech, HealthTech, and Enterprise Software, demonstrating his expertise across various domains.
Oscar has gained valuable experience working in both the USA and the Netherlands. His technical skills include utilizing Golang, Python, BigQuery, Apache Spark on Databricks (AWS), and Scala to create robust software systems.
One of Oscar's proudest achievements was developing a patented idea with USPTO, which he successfully took to market. This project showcases his innovation and ability to bridge the gap between concept and commercialization.
In addition to his technical expertise, Oscar has demonstrated exceptional team-leading skills throughout his career, further highlighting his ability to deliver high-quality results in complex projects.
Main expertise
- Apache Spark 10 years
- AWS 10 years
- BigQuery 5 years
Other skills
- MySQL 13 years
- PostgreSQL 13 years

- ETL 11 years

Selected experience
Employment
Senior MLOps Engineer
Sago Mini - 2 months
- Promoting Machine Learning models to Production on GCP
Technologies:
- Technologies:
Python
Vertex AI
Tech Lead / MLOps & Optimization Platform
Occidental Petroleum (Oxy) - 4 months
Summary: Led design and delivery of Oxy’s Optimization Pillar MLOps platform in AWS ● Designed and implemented MLOps platform integrating AWS (S3, ECS/Fargate, SageMaker, Lambda) with Oxy’s ODAP Lakehouse ● Packaged and deployed Python optimization models (Gurobi/Pyomo) with CI/CD pipelines in Azure DevOps + MLflow ● Built PySpark ingestion pipelines from Kabal APIs, SQL Server, and PI systems into ODAP, ensuring governance and schema validation ● Collaborated with data scientists and IT to enable predictive maintenance and vessel scheduling optimization use cases ● Mentored engineers and defined role skill matrices across MLOps, DevOps, Backend, and QA
Technologies:
- Technologies:
AWS
Python
Machine Learning
Senior Backend Developer
Reddit - 5 months
Summary: Backend development in Golang and Python ● Developed new integrations with Notification Platform to send emails to 300k+ users ● Implemented concurrency in email send increasing performance by 98% ● Implemented Spam filters in email send increasing performance further by 46% ● Developed client support for Business Experiences team to tap into Notification Platform, making progress towards goal of deprecating integrations with legacy Mailroom messaging. ● Code reviews and various team activities
Technologies:
- Technologies:
Golang
Apache Kafka
Senior Data Engineer
Curinos - 8 months
-
Led data product development on the Databricks Lakehouse platform, ensuring efficient data handling and analysis;
-
Migrated data from MySQL and PostgreSQL databases using AWS Database Migration Service (DMS) to streamline data management;
-
Developed Data Pipelines using Delta Live Tables (DLT) for real-time and batch processing of data;
-
Created a Code Generation tool to automatically generate Scala code for Databricks, enhancing development speed and accuracy;
-
Proficient in Databricks, Scala, and Python, with a strong focus on scalable data engineering solutions.
Technologies:
- Technologies:
MySQL
PostgreSQL
AWS
Databricks
Python
Scala
- Data Engineering
-
Senior Data Engineer
Clevertech - 2 years 11 months
- Developed a Reporting API for analyzing large-scale advertising campaigns (Golang, BigQuery)
- Created an Advanced Query Tool in Golang for complex SQL queries, reducing processing time by 50%
- Implemented Data Modeling for forecasting TV Ads performance to extrapolate impressions, increasing revenue by 20%
- Debugged and improved complex queries in BigQuery, reducing overall query complexity
- Enhanced collaboration with the Data Science team by serving as an interface with the Backend team
Technologies:
- Technologies:
Golang
SQL
- Data Engineering
BigQuery
Co-Founder and CTO
Sciencesheet - 1 year 8 months
- Developed Codegen for ML pipelines (Spark, Scala, Python), accelerating data science processes by 10x
- Invented and patented Codegen technology for processing millions of spreadsheet rows in Spark using Excel formulas
- Launched a startup from idea to market within one year
- Increased market reach by developing plugins for Google Sheets and Microsoft Excel
- Successfully developed the AWS Backend using Sagemaker Autopilot, Lambda, EC2, SNS, and SES
Technologies:
- Technologies:
AWS
Python
AWS Lambda
Scala
AWS EC2
Hadoop
Microsoft Excel
Data Scientist / Engineering Manager
PayPal (Xoom) - 3 years 9 months
- Tech Lead for Data Science and Engineering team (Spark, Scala, Python)
- Managed a team of five data scientists and data engineers
- Developed a Locations indexer, doubling the speed of finding bank branches in India
- Increased market coverage for the Sendmoney product by supporting FP&A analyses in Spark instead of Excel
- Enhanced the effective reach of push notifications by 20% through segmentation analyses in Spark
Technologies:
- Technologies:
Apache Spark
Python
Scala
- Data Engineering
- Team Leading
Microsoft Excel
Cloud Engineer
Mendix - 3 years 5 months
-
Developed the Mendix Cloud platform using a Mendix code generation tool, streamlining the development process;
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Architected robust security protocols for the Mendix Enterprise Cloud Platform, ensuring data protection and compliance;
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Automated parallel firewall installation and configuration across thousands of cloud nodes, enhancing security and operational efficiency;
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Reverse-engineered Mendix code generation to reproduce applications using the open-source WebDSL language, expanding platform versatility and open-source integration.
Technologies:
- Technologies:
AWS
Python
- Data Engineering
-
Summer Intern
Google - 3 months
-
Conducted data mining on a Git repository containing 70 Apache projects, extracting valuable insights for analysis;
-
Presented the project findings at ApacheCon US in Atlanta, showcasing expertise and contributing to the open-source community.
Technologies:
- Technologies:
Apache Spark
- Data Engineering
Git
-
Education
MSc.Computer Science
Delft University of Technology · 2009 - 2011
MSc.Management and Technology
Delft University of Technology · 2007 - 2009
MSc.Management and Technology
Delft University of Technology · 2007 - 2009
BSc.Computer Science
Universidad Francisco Marroquín · 1997 - 2002
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