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Mathias Fernández

@mathiasfernndez

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I build high-performance backend platforms with Go, Java, and cloud services.

Uruguay

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At Stocktwits, I build Golang RESTful APIs supporting the full application, improve application performance, and migrate legacy Python code to Go. I also help shape architectural features and use unit, integration, and load testing to keep systems robust.

Through Howdy, I built a sensor-data dashboard API for Pulsa Sensors with Go, PostgreSQL, AWS EC2, and RabbitMQ. For WP Engine, I migrated slow monolithic PHP endpoints into Go microservices, improving performance by 35%.

I've also delivered card tokenization services at Mercado Pago, contributing to Visa, Mastercard, and WhatsApp Pay for Brazil. At dLocal, I worked on core business microservices and customer-data systems using Java, Spring, MySQL, Redis, Elasticsearch, and AWS.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Stocktwits

Oct 2023 - Present (2 years 11 months)

Implemented RESTful APIs in Golang supporting the entire application, using MySQL, PostgreSQL, AWS services, Redis, Docker, and Kubernetes. Improved performance of various applications and migrated legacy Python code to Go.

Go MySQL PostgreSQL AWS Redis Docker Kubernetes REST APIs Performance Optimization Unit Testing Integration Testing Load Testing

Current

Senior Software Engineer

Current

Pulsa Sensors

Apr 2023 - Present (3 years 5 months)

Developed RESTful APIs for a UI dashboard to display sensor data, utilizing Golang, PostgreSQL, AWS EC2, and RabbitMQ. Implemented features using TDD approach to ensure code quality and robustness.

Go PostgreSQL EC2 RabbitMQ REST APIs Test Driven Development

Senior Software Engineer

Howdy

May 2022 - Oct 2023 (1 year 5 months)

Developed RESTful APIs for a UI dashboard to display sensor data, utilizing Golang, PostgreSQL, AWS EC2, and RabbitMQ. Implemented features using TDD approach to ensure code quality and robustness.

Go PostgreSQL EC2 RabbitMQ REST APIs Test Driven Development

Senior Software Engineer

WPEngine

May 2022 - Apr 2023 (11 months)

Migrated slow endpoints from a monolithic PHP API to Golang microservices, resulting in a 35% performance increase. Collaborated on implementing gRPC-based common API and RESTful API using grpc-gateway, Docker, Kubernetes, and PostgreSQL.

Go gRPC REST APIs Docker Kubernetes PostgreSQL Microservices Performance Optimization

Senior Software Engineer

Mercado Libre

Jul 2020 - Aug 2021 (1 year 1 month)

Implemented Card Tokenization microservice in MercadoPago's Ingate team using Golang, MySQL, and Message Queues. Successfully delivered Visa and Mastercard projects, contributing to WhatsappPay for Brazil, and participated in candidate technical interviews.

Go MySQL Message Queues Microservices Card tokenization Technical Interviews

Senior Software Engineer

dLocal

Aug 2019 - Jul 2020 (11 months)

Developed changes in core business logic microservices, serving as a key contributor to web dashboard release. Managed microservices for customer data, enabling 100% customer adoption.