Open to opportunities

Mário Diniz

@mriodiniz

Message

I build scalable backend systems, billing platforms, and payment integrations.

Brazil

Message

What I'm looking for

I'm looking to build and own critical backend features, APIs, integrations, and data-intensive systems, while contributing across the stack when needed.

I've built backend systems for Lago, an open-source API-first billing and metering platform for SaaS and usage-based businesses, supporting subscriptions, invoicing, and complex pricing workflows.

At Rhino, I worked on the Payments team with Stripe to improve payment flows and help build a faster enrollment system through third-party integrations. I contributed across Ruby on Rails and React/TypeScript, using RSpec, Capybara, Stimulus/Turbo, and Tailwind CSS.

I've also supported reliable email processing at SaneBox and developed management systems for Xlung's healthcare education simulator. My foundation in computer science, databases, Oracle PL/SQL, Java, and Ruby on Rails informs my work on APIs, event-driven architectures, and data-intensive production systems.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Lago

Mar 2025 - Present (1 year 6 months)

Developed and maintained an open-source, API-first billing and metering platform for modern SaaS and usage-based businesses, supporting complex pricing models and flexible deployment options.

Ruby on Rails API Design Billing Systems SaaS Event Driven Architecture