Emerson – PostgreSQL, Next.js, Node.js

High-concurrency Remote Game Server (RGS) and real-time iGaming platform built to support regulated casino operations. Leading the full-stack architecture, I owned the end-to-end development of the core transaction engine and interactive game clients—enabling ultra-low latency game sessions (10,000+ concurrent requests in 70–150ms), real-time betting events, regulatory compliance auditing, and seamless frontend gaming experiences.

• Engineered a mission-critical Remote Game Server (RGS) and real-time transactional engine using Node.js, NestJS, and TypeScript, sustaining 10,000+ concurrent requests while maintaining 70–150ms p99 latency.
• Leveraged Redis Streams and distributed locking mechanisms to process high-velocity transactional events, preventing race conditions and enforcing strict API rate limiting.
• Designed fault-tolerant PostgreSQL schemas with Drizzle ORM, applying DDD and CQRS patterns to decouple high-frequency write operations from complex read/reporting queries for ACID-compliant financial ledgers and automated regulatory compliance.
• Built high-performance, real-time frontend interfaces using Next.js, React, and WebGL/PixiJS, ensuring smooth state synchronization under heavy network traffic.
• Spearheaded an AI-augmented QA pipeline using Claude Code agents to automate Playwright E2E test suites, cutting regression testing cycles and accelerating CI/CD deployments.

Large-scale B2C retail e-commerce and multi-vendor marketplace serving 120,000+ daily active users across Brazil, modernized from a legacy monolithic architecture into a resilient, headless React and Node.js ecosystem capable of sustaining massive Black Friday traffic peaks.

• Promoted to Tech Lead within 4 months after taking ownership of a stalled enterprise B2C marketplace (120,000+ daily active users), aligning roadmaps with executive stakeholders to deliver a successful Go-Live.
• Led the end-to-end frontend and BFF modernization from a legacy Knockout.js monolith to a scalable React, Redux, Next.js, and Node.js headless ecosystem, eliminating N+1 query bottlenecks.
• Diagnosed and resolved critical production downtime caused by third-party partner integrations flooding internal Admin APIs; re-architected Node.js API routing, connection pooling, and rate limiting to isolate mission-critical workloads.
• Engineered low-latency checkout security by integrating client-side device fingerprinting with custom Node.js fraud-prevention middleware, and guaranteed Black Friday stability using Akamai CDN edge caching and Datadog observability.

Enterprise B2C e-commerce platform and custom Node.js middleware architecture built for a major retail brand, designed to handle complex pricing rules, real-time inventory synchronization, and high-traffic seasonal sales.

Pioneered one of Brazil's first enterprise Oracle Store Front (OSF) implementations, defining scalable architectural standards, UI component blueprints, and development guidelines.

• Architected and delivered an enterprise B2C e-commerce platform using React, Redux, and Node.js, establishing scalable UI component blueprints and frontend coding standards.
• Developed custom Node.js Server-Side Extensions (SSEs) and middleware to orchestrate complex pricing, inventory, and checkout rules across relational databases (MySQL/PostgreSQL).
• Reduced backend API latency by 50% during peak traffic by implementing Redis caching strategies and optimizing payload serialization.

Cloud-based corporate IoT automation and real-time telemetry system built on AWS, enabling enterprise clients to monitor, manage, and control distributed hardware devices remotely through a low-latency web dashboard.

• Engineered a corporate IoT automation and telemetry platform, integrating a responsive, real-time React dashboard with Node.js and Python microservices on AWS for remote hardware monitoring and device control.
• Implemented low-latency data ingestion workflows and state synchronization between connected IoT devices and the web interface.