Luiz Rafael do Nascimento Agner

Brazil

github.com/luiznaac

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About me

Senior backend engineer focused on solving meaningful problems through solid architecture and software craftsmanship. With 7+ years of experience, I'm recognized for elevating code quality, leading complex design discussions, and mentoring teams on building maintainable and scalable solutions. I have strong experience with distributed systems, microservices, and asynchronous architecture, and I aim to build secure, resilient platforms that deliver lasting value to users and stakeholders.

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Experience

Mercado Libre / Software Engineer

Since November/2023, Full-remote

- Architected multiple high-complexity systems with asynchronous communication between microservices and databases

- Collaborated closely with product stakeholders to translate business requirements into scalable system designs and implementations

- Designed and implemented a fraud detection system enabling the termination of thousands of fraudulent accounts

- Engineered an automated cash recovery and victim compensation workflow that reduced financial loss friction, improved operational efficiency, and accelerated funds return to affected users

PicPay / Software Engineer

September/2021 - November/2023, Full-remote

- Implemented a microservice that orchestrated feature value calculations and data storage within the data engineering pipeline

- Developed an open finance data platform enabling company-wide access to financial data for millions of users, directly contributing to reduced fraudulent credit card transactions

- Architected and implemented a new product leveraging the open finance platform, designed to scale for millions of users

- Developed and maintained scalable microservices using Kotlin, Spring Boot, MySQL, RabbitMQ, AWS SQS, DynamoDB, and Amazon S3

EBANX / Software Engineer

February/2019 - September/2021, Curitiba, Brazil and Full-remote

- Implemented and maintained multiple internal modules focused on financial and accounting workflows, handling large-scale data processing

- Owned a high-throughput PHP API, managing the complete development lifecycle including code and test development, CI/CD implementation, and system monitoring through metrics and log analysis

- Refactored legacy code to improve efficiency and test coverage, enabling the platform to support company expansion and increased API demand

- Implemented new financial workflows that reduced operational costs by thousands of dollars weekly and decreased friction with enterprise clients

Sinqia / Software Engineer Intern

February/2018 - January/2019, Curitiba, Brazil

- Developed and maintained Java and Delphi applications supporting banking back office operations, ensuring system stability and reliability

- Designed and maintained SQL Server stored procedures for data processing and reporting workflows

- Led system documentation and codebase migrations

PET-ECO / Hardware and Software Developer Intern

June/2017 - February/2018, UTFPR - Curitiba, Brazil

- Development of printed circuit boards using Eagle

- Development of GUI to control a robot using Java

- Communication with the robot using XBee

- Microcontroller programming with C, C++ and Assembly

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Education

UTFPR / Bachelor in Computer Engineering

January/2014 - December/2021, Curitiba, Brazil

Universität Duisburg-Essen / Interchange Year

July/2015 -September/2016, Duisburg, Germany

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Languages

Portuguese - native

English - professional proficiency

German - limited professional proficiency