I am a Senior Software Engineer with over 10 years of experience building high-availability, scalable systems and delivering products across retail, fintech, healthcare, and e-commerce. I specialize in Ruby, Ruby on Rails, React, and Go, with strong expertise in REST and GraphQL APIs and distributed, event-driven architectures. I have extensive experience with PostgreSQL, Redis, Elasticsearch, and MongoDB, as well as leading complex system upgrades and integrations with zero downtime in high-traffic environments. I focus on building reliable, scalable solutions while maintaining strong performance and code quality.
Ruby on Rails
React.JS
Ember.js
Angular JS
Vue.js
Typescript
-Led a scaled, zero-regression upgrade of the Ruby Sequel ORM to its latest version with no downtime while the platform served up to 1,000 requests/second.
-Integrated and supported multiple payment gateways (Heartland, Clover, Datacap, eConduit), enabling merchants to capture card-present payments.
-Bootstrapped an offline-capable POS as a browser web app using service workers to cache all API requests, migrating core business logic from backend to frontend in React.
-Built a Sales Order notification system on AWS SQS, letting internal services subscribe to sales-flow events; extended the POS to deliver receipts via SMS and email.
-Delivered greenfield Rails products for enterprises and Brazilian startups in an agile consultancy setting.
-Acted as a project-rescue specialist, applying refactoring and identifying pain points to get stalled products back on track.
-Rewrote the clinical-trial builder in React, introducing isolated alpha and production versions so users could safely configure trials without affecting live data.
-Cut AWS RDS latency and resource usage by ~50% through targeted performance work; moved infra to Terraform for automated, per-trial environments.
-Improved GraphQL authentication/authorization to reduce database calls and enable field-level, permission-based access rules; built HIPAA-compliant services and eConsent document signing.
-Built a Go desktop agent that exposed local printers and payment terminals to the web POS over a local API — bridging in-store hardware with the cloud application.
-Designed a dynamic reporting module as a star schema and authored a custom Ruby DSL letting developers declaratively describe facts, metrics, dimensions, and properties.
-Integrated the Sales Order flow with Shopify, BigCommerce, and Magento, and synced orders with QuickBooks accounting.
-Worked across POS core features — promotions, coupons, taxes, and payments — including hardware integration for printers and credit-card devices.
-Led the customer-facing rebrand UI in React with Design and Product, and built TRAC, a project surfacing in-store traffic and sales-conversion data via APIs.
-Built a Rails platform for automated Google & Bing Ads campaigns, letting car dealers allocate budget by car/brand weighting and optimize cost-per-click by bidding for second/third ad placement.
-Built an analytics dashboard from scratch with a custom d3.js geographic map for click-to-call and conversion data.
-Led migration of multiple frontend applications from Ember to React.
-Introduced RabbitMQ as a queue to scale transaction volume against hardware-appliance validation constraints.
-Built the Walmart Brazil marketplace platform from the ground up in Ruby/Rails/Sinatra, integrating large sellers such as Saraiva and Mobly.
-Built Cerebro, a service that automatically categorized seller products during onboarding — collapsing a 5-step manual flow and significantly speeding up how quickly sellers could list their catalogs.
-Matched third-party seller products to canonical Walmart listings to improve the customer experience.
-Designed the Black Friday high-traffic strategy, caching all listings so the bulk of traffic was served by CDNs.