Leonardo Santana leonardosantana214

`PRESS START`

Full-Stack / Product Engineer building TypeScript products across React/Next.js frontends, NestJS/Node APIs, PostgreSQL relational data layers and Docker/Linux deployments. Experience in healthcare SaaS, realtime financial platforms, and workflow automation.

_{📍 São Paulo, Brazil • 🌍 Open to: International Remote (USD/EUR/BRL) • B2B / Contractor • Relocation}

`// PLAYER PROFILE`

`IDENTITY.dat`

PLAYER         Leonardo Santana
CLASS          Full-Stack / Product Engineer
CORE FOCUS     Web Products & Realtime Systems
REGION         São Paulo, Brazil
AVAILABILITY   Remote (Global) • B2B • Relocation
MODE           In Production

`CURRENT_BUILD.dat`

[CORE]       Full-Stack Web & Product Engineering
[PRIMARY]    TypeScript • Node.js • NestJS
[PRIMARY]    React • Next.js • TailwindCSS
[STRONG]     PostgreSQL • Prisma ORM • SQL
[STRONG]     Realtime WebSockets • Event Streaming
[ACTIVE]     Docker • Linux Deployments
[ACTIVE]     Workflow Automation & AI Integrations
[SIDE QUEST] Godot 4 • 2D Pixel RPG Systems

`SYSTEM MESSAGE`

"I build TypeScript products across backend APIs, React interfaces, realtime event pipelines and automation workflows, deploying them to Docker/Linux environments."

`// SAVE FILES — FEATURED ENGINEERING CASES`

_{VERIFIED ARCHITECTURE CASE STUDIES FOR PRODUCTION SYSTEMS}

CPAE Healthcare SaaS	Multi-Tenant Healthcare Clinical & EHR SaaS _{Production SaaS for multidisciplinary clinical practice with strict healthcare privacy.} Multi-Tenancy: Strict tenant isolation across clinics and practitioner rosters. Healthcare RBAC: Granular guards separating clinical EHR evolutions from reception/billing. Document Pipeline: MinIO S3 object storage for medical attachments with presigned URL tokens. Async Processing: Redis-backed Bull queue workers for automated report and PDF generation. `NestJS 11` `Next.js 16` `Prisma 6` `PostgreSQL` `MinIO S3` `Bull/Redis` `Docker`
BackOption Realtime	Real-Time Financial Trading Terminal & Market Stream _{High-frequency event-driven market terminal with sub-second chart rendering.} WebSocket Pipeline: Persistent market streams with heartbeat recovery and exponential backoff. TradingView Charts: Lightweight Charts with dynamic multi-timeframe candle aggregation (1s to 1d). Client Analytics: Pure-math technical indicators (Bollinger Bands, EMA, SMA, RSI) calculated in real time. Resilient Failover: Synthetic candle generator maintaining smooth UI pacing during network drops. `React 18` `Vite 6` `WebSockets` `Lightweight Charts` `Broker SDK` `TailwindCSS`
ProfitX Trading Engine	Modular Automated Trading Engine & Risk Controls _{Service-oriented algorithmic engine with code-level circuit breakers and audit ledger.} Service Decomposition: Modular separation of Signal Analyzer, Risk Validator, and Trade Executor. Finite State Machine: Rigid transition guards eliminating duplicate order executions during market spikes. Risk Controls: Automated stop-loss, take-profit, daily drawdown caps, and slippage tolerances. Audit Ledger: PostgreSQL relational logging tracking execution timestamps, slippage, and fees. `TypeScript 5.3` `Node.js` `Express` `PostgreSQL` `Docker Compose` `Next.js`
TedInver: Reborn	2D Pixel-Art Action RPG & Gameplay Architecture _{Exploration of gameplay state machines, narrative event loops, and retro pixel-art aesthetic.} Game Systems: Inventory mechanics, NPC schedule routines, companion AI, and dialogue pipelines. Engine Architecture: Custom GDScript event buses, state machines, and headless testing harnesses. `Godot 4` `GDScript` `Pixel Art` `Game Architecture`

ℹ️ Several production repositories are private due to client and project confidentiality. Verified public architecture case studies are linked above.

`// SKILL TREE`

LANGUAGES	FRONTEND	BACKEND	DATABASE
DEVOPS & CLOUD	MOBILE	GAME SYSTEMS	TOOLING

`// ACTIVE QUESTS`

01	Production Product Engineering _{Delivering resilient full-stack web applications, multi-tenant architectures, and reliable APIs.}
02	Realtime & Distributed Systems _{Mastering WebSocket event streams, resilient client failovers, and streaming financial charts.}
03	International Engineering Collaboration _{Collaborating with global teams on high-impact products via remote contracts and engineering roles.}

`// GITHUB TELEMETRY`

_{LIVE PLAYER DATA / PUBLIC REPOSITORY SIGNAL}

`// CONTACT TERMINAL`

> whoami
Leonardo Santana

> role
Full-Stack / Product Engineer

> core_stack
TypeScript • React/Next.js • NestJS/Node • PostgreSQL • Docker/Linux

> location
São Paulo, Brazil (UTC-03)

> availability
International Remote • B2B / Contractor • Relocation

> email
dev.leonardosantana@gmail.com

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