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Software Project Leader at Mercado Libre

Building resilient systems that scale.

12+ years of experience crafting high-availability software, leading teams, and shipping products across fintech, e-commerce, and travel tech.

View my work → Download CV ↓
Portrait photo of Roniel Lopez
Montevideo, UY — 34.9°S 56.2°W
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§ 02 / About MVD · UY

A bit about me

I'm a Software Project Leader at Mercado Libre, where my team builds fraud scoring systems that evaluate over 1 billion transactions per day across Latin America. Before Mercado Libre, I led 15+ engineers at Sabre building high-throughput microservices with 99.7% uptime, and worked on payment systems at Verifone. My journey started in Cuba, where I earned a CS degree from UCI with a thesis on AI-driven decision-making and published research on open-source desktop environments. Since moving to Uruguay in 2021, I've built products across fintech, travel tech, and marketplace fraud prevention at continental scale.

Transactions / Day 1B+
Uptime at Sabre 99.7%
Engineers Led 15+
Years Shipping 12+
Location
Montevideo, Uruguay
Company
Mercado Libre
Role
Software Project Leader
Focus
Fraud Prevention at Scale
Education
CS Engineer — Universidad de las Ciencias Informáticas (UCI), Cuba (4.96 GPA)
Languages
Spanish (Native), English (Advanced)

Self-Hosting · Automation · Games · Music · Travel · Hiking · Books · Cars

§ 03 / Experience 12+ YRS

Work Experience

Nov 2024 — Present

Software Project Leader

Mercado Libre Current  · Montevideo, Uruguay

  • Lead and mentor a team of 7 backend engineers building real-time fraud scoring systems that evaluate over 1 billion transactions per day across 8 Latin American markets.
  • Drive fraud prevention strategy contributing to nearly $1B USD in approval improvements while maintaining chargeback rates below 0.20% in major markets.
  • Architect the technical roadmap for anti-fraud systems, aligning engineering priorities with business risk objectives across multiple countries.
  • Partner with Data Science and Analytics teams to build proactive, data-driven fraud detection models that achieve 96–99% approval rates across the region.

Java · Go · Python · Spring Boot · Agile · Data Analytics

Oct 2021 — Nov 2024

Lead Software Engineer

Sabre · Montevideo, Uruguay

  • Developed microservices in Java, including a reverse proxy with load balancing, throttling, and circuit breakers (Spring Boot/Webflux).
  • Designed and implemented performance test cases to ensure system reliability.
  • Built an admin web app for the reverse proxy (Angular).
  • Automated CI/CD with Jenkins and Ansible; deployed to GCP with metrics, dashboards, and Redis.
  • Managed a team of 15+ developers.

Java · Go · Webflux · Angular · GCP · Jenkins · Redis

Jan 2021 — Sep 2021

Senior Software Engineer

Switch Software Solutions (Verifone) · Montevideo, Uruguay

  • Developed microservices for payment gateway-to-terminal communication (Spring Boot).
  • Maintained and extended a monolith application built with Spring.
  • Designed performance test cases for system reliability.
  • Migrated a web app from AngularJS to Angular 2.

Java · Spring Boot · Angular · Performance Testing

Plus 8+ years of prior experience in fintech and software engineering.

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§ 04 / Skills 6 CATEGORIES

Skills & Technologies

Backend — Core systems and APIs

Java · Go · Python · Spring Boot · WebFlux · Node.js · Hibernate · R2DBC

Frontend — Web and mobile interfaces

React · Angular · TypeScript · HTML/CSS · Swift

Databases — Storage and caching

PostgreSQL · MySQL · MongoDB · Redis

Cloud & DevOps — Infrastructure and delivery

GCP · AWS · Docker · Kubernetes · Terraform · Jenkins · Ansible · CI/CD

Architecture — Patterns and principles

Microservices · RESTful APIs · Reactive Programming · Design Patterns · Clean Code · SOLID · TDD

Leadership — Teams and processes

Team Leadership (15+ engineers) · Agile / Scrum · Technical Roadmaps · Code Reviews · Mentoring · Performance Testing

§ 05 / Projects VIA GITHUB API

Open Source & Projects

View all on GitHub →
§ 06 / Contact UTC−3

Let's work together

Have a project in mind or want to discuss an opportunity? I'd love to hear from you.

Get in Touch
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