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Ronel Zapata

@ronelzapata

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Senior software engineer building scalable healthcare and energy platforms with Python, .NET, and AWS.

Mexico

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What I'm looking for

I’m looking for a senior role where I can architect cloud-native systems, own scalable ETL and APIs, and modernize architectures with DDD/CQRS—while applying secure data practices and AI/ML integrations that deliver measurable reliability and accuracy.

I’m a Senior Software Engineer with 14+ years architecting scalable, high-performance systems across healthcare technology and energy. I turn complex data and integrations into reliable, cloud-native products—full stack, with strong foundations in architecture and security.

In my recent role, I achieved and maintained a 100% Integration Health Score with zero data quality incidents for a largest-client partnership, processing millions of records monthly. I architected ETL pipelines using Django ORM and AWS, delivering millions of records daily with 99.8% pipeline reliability.

I also focus on making systems easier and safer to ship. I led refactoring that reduced deployment complexity by 75% (manifest-based configuration), cutting time-to-market from 6 months to 4 weeks per integration, and I built secure isolated test environments with automated data masking to prevent production incidents.

Beyond data, I design modern services and intelligence layers: DDD, CQRS, microservices, and event-driven workflows. I’ve migrated systems toward DDD, implemented IaC with Terraform/Serverless, and integrated AI using OpenAI GPT-4o (with secure key handling) to drive ML-powered scoring and forecasting with measurable accuracy gains.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Dental Link Exchange

Sep 2023 - Present (2 years 9 months)

Architected a data interchange workflow engine processing 900+ transaction files in under 5 minutes, achieving a 50x improvement over legacy with 99.9% accuracy. Led migration to DDD/vertical slice with CQRS and implemented ML-powered scoring that reduced manual review workload by 70% while processing thousands of transactions daily.

C# .NET Core ASP.NET Core AWS Lambda API Gateway SQS React Redux CQRS

Software Engineer

Cedar Cares, Inc.

Apr 2022 - Jan 2026 (3 years 9 months)

Owned lead engineering of a largest client partnership, maintaining a 100% Integration Health Score with zero data quality incidents while processing millions of records monthly using Python and Django ORM. Built and refactored ETL pipelines to improve reliability to 99.8% and reduce deployment complexity by 75%, cutting time-to-market from 6 months to 4 weeks per integration.

Python Python Django PostgreSQL Terraform Apache Airflow Snowflake ETL Data Quality Engineering IaC

Senior Full Stack .NET Developer

OVS Group, LLC

Jul 2018 - Apr 2022 (3 years 9 months)

Delivered production analytics applications for oil and gas operations, improving long-running report performance by 60% through T-SQL query optimization for queries processing millions of records. Reduced weekly deployment time by 50% by streamlining CI/CD via Bitbucket and JIRA automation, and improved stability by resolving 150+ defects using systematic debugging and TDD.

C++.NET MS SQL Server T SQL TDD Query Optimization AngularJS Performance Tuning

.NET Developer

OVS Group de México

Jun 2011 - Jul 2018 (7 years 1 month)

Served as an on-site technical consultant for Pemex, supporting petroleum engineering production and data analysis workflows. Led an Oracle-to-SQL Server migration by transforming PL/SQL procedures into T-SQL stored procedures with 100% functional parity and improved database performance.