01
Full Stack Engineering
End-to-end development with Python, FastAPI, Flask, React, Next.js and TypeScript. From database design to responsive UIs.
Available for new projects
Artur Guerra
I buildreal productsend to end.
>Full Stack Developer
From architecture to deployment — multi-tenant SaaS, healthtech and automation platforms with AI woven into every layer. Not demos. Production.
PythonFastAPITypeScriptNext.jsReactReact NativePostgreSQLRedisCeleryDockerFlaskPHPAngularTailwindOpenAIClaudeGeminiWebSocketsAWS S3ExpoClean ArchitectureOAuth 2.0PythonFastAPITypeScriptNext.jsReactReact NativePostgreSQLRedisCeleryDockerFlaskPHPAngularTailwindOpenAIClaudeGeminiWebSocketsAWS S3ExpoClean ArchitectureOAuth 2.0
About
I don't just write code — I ship products.
I'm a Full Stack Developer and Information Systems student at CEFET/RJ, focused on building complete systems that solve real business problems. Currently a Full Stack Development Intern at Visol, working with PHP and Angular, where I integrated the franchise hub with the company's core platform.
Every project I take on is approached with a product mindset: understanding the domain, designing for scale, and shipping features that create real impact. I've built multi-tenant SaaS platforms, healthcare systems, sports management tools, and gaming platforms — all from scratch.
What sets me apart is the practical integration of AI into real systems: OCR pipelines, multi-provider LLM chains with fallback, intelligent agents, and automated workflows that run in production.
artur@builder ~ %
1class Engineer(Builder):2 stack = ['python', 'ts', 'php']3 ai = MultiProvider(fallback=True)4 5 async def ship(self, idea):6 # architecture → deploy7 return await self.build(idea)0+
Products shipped
0k+
Lines in one platform
0
Industries served
0
LLM providers in prod
Trajectory
Currentlive
Full Stack Development Intern
Visol
Building with PHP and Angular on the company's core platform, where I integrated the franchise hub with the main system.
PHPAngularIntegrations
Ongoinglive
Solo Creator & Developer
EvoSolar Franquias · Zelo App · Fantasy Picks
Designing, building and operating full SaaS products end to end — architecture, backend, mobile, AI integration and infrastructure.
FastAPIReact NativeLLMMulti-tenant
In progresslive
BSc Information Systems
CEFET/RJ
Systems architecture, databases, distributed computing and software engineering fundamentals.
Information Systems
Delivered
Freelance Developer
Pecci Cuidado Integrado
Clinical management platform for an integrated care clinic — deployed and running in production.
FlaskPostgreSQLHealthTech
Capabilities
Six disciplines that compound into complete, production-grade products.
02
Systems Architecture
Multi-tenant SaaS, Clean Architecture, async-first backends, role-based access control and production infrastructure with Docker.
03
Applied AI
Multi-provider LLM integration (OpenAI, Claude, Gemini) with fallback chains, OCR pipelines and AI-powered data extraction in production systems.
04
Agents & Automation
Celery-driven background jobs, scheduled tasks, real-time sync pipelines, push notification systems and workflow orchestration.
05
API & Integrations
Google Ads, Meta Graph API, Firebase, OneSignal, football-data.org, SharePoint, ANVISA — deep third-party integration experience.
06
SaaS & Product
From MVP to production: multi-tenant architectures, payment flows, analytics dashboards, onboarding systems and retention mechanics.
Selected work
Real systems running in production — built solo, from the first migration to the last deploy.
01Solar Energy · SaaSAI
EvoSolar Franquias
Multi-tenant franchise management platform for solar energy companies. Handles onboarding, KPI tracking, royalty calculations, ad campaigns and internal communication across franchise units.
34
backend modules
83k+
lines of code
2
ad platforms
- 34 backend modules with 83k+ lines of code
- Google Ads & Meta API integration with OAuth
- Google Gemini agents for conversational intelligence
- WebSocket real-time chat with SLA tracking
- Automated royalty calculations and financial sync
FastAPIReactReact NativePostgreSQLRedisCeleryDocker
Role · Solo Creator & DeveloperPrivate repository
02HealthTech · SaaSAI
Zelo App
Medication management platform for families with elderly and chronic patients. Centralizes drug scheduling, caregiver coordination, dose tracking, stock management and adherence analytics.
38
API endpoints
15
service domains
3
LLM providers
- Multi-provider AI chain (OpenAI, Claude, Gemini) with automatic fallback
- OCR medication extraction enriched with the ANVISA drug catalog
- Timezone-aware scheduling for multi-caregiver coordination
- 38 specialized API endpoints across 15 service domains
- LGPD compliance architecture with encryption and audit trails
FastAPIReact NativeExpoPostgreSQLRedisCelery
Role · Solo Creator & DeveloperView code
03Sports & Gaming · SaaS
Fantasy Picks
Fantasy sports platform with survivor-style pick mechanics. Users buy picks to enter real football championships, select teams weekly and compete for prizes based on match results.
12+
leagues covered
2
wallet balances
100%
async I/O
- Async-first architecture with asyncpg for high concurrency
- Pick lineage tracking with complex business rule validation
- football-data.org integration across 12+ leagues
- Dual-balance wallet system (picks + prize BRL)
- Clean Architecture with repository pattern and service layers
FastAPINext.jsTypeScriptTailwindPostgreSQLRedis
Role · Solo Creator & DeveloperPrivate repository
04Sports Management
BR1 Sports Academy
Sports academy management system handling the complete lifecycle of young athletes — from initial interest through advanced training with multi-role staff coordination.
6
role levels
17k+
lines of Python
auto
PDF reports
- Six-level role-based access (admin, coach, doctor, psychologist, trainer)
- Automated PDF generation and merging pipeline for player reports
- Bioimpedance integration with advanced body composition metrics
- Interested-to-athlete CRM pipeline for prospect management
- 17k+ lines of production Python
FlaskPostgreSQLBootstrapChart.jsReportLab
Role · Solo Creator & DeveloperPrivate repository
05Education · Social PlatformAI
Cesh
Academic social network for CEFET students. Centralizes institutional data (schedules, grades, directory) into a modern platform with social features and intelligent portal synchronization.
190+
PHP files
0
credentials stored
PSR-4
namespacing
- Zero-credential portal sync via browser extension and userscript
- GitHub Copilot Chat integration with OAuth Device Flow
- Adaptive CSS/XPath selectors that auto-recalibrate on portal changes
- Privacy-first architecture with granular data revocation
- 190+ PHP files with PSR-4 namespace structure
PHP 8.3Slim 4MySQLDockerFlaskAWS S3
Role · Solo Creator & DeveloperPrivate repository
06HealthTech · Clinic Management
Pecci Cuidado Integrado
Clinical management platform for healthcare professionals. Enables data storage, appointment management and patient evolution tracking for an integrated care clinic.
live
in production
- Full appointment and patient evolution management
- Professional-focused data management interface
- Deployed and running in production
FlaskPostgreSQLBootstrapJavaScript ES6+
Role · Freelance DeveloperPrivate repository
AI & Automation
I integrate AI where it creates real value — not as a buzzword, but as a core system capability.
How it runs
01
Ingest
OCR, third-party APIs and portal scraping normalized into typed domain models.
02
Reason
Multi-provider LLM chain with automatic fallback, token accounting and prompt caching.
03
Orchestrate
Celery workers, schedules and circuit breakers turning model output into business actions.
04
Ship
Streamed responses, push notifications and dashboards — observable and rate-limited.
Multi-Provider LLM Chains
Production systems with OpenAI, Claude and Gemini featuring automatic fallback, token tracking and prompt caching for reliability and cost control.
OCR & Document Intelligence
Computer vision pipelines that extract structured data from medication labels, enriched with ANVISA catalog matching for validation.
Conversational Agents
Gemini-powered agents with tool use, stream-based responses and circuit breaker patterns for graceful degradation.
Intelligent Automation
Celery workflows: ad metrics sync every 30 minutes, SLA breach detection every 5 minutes, nightly royalty calculations and CRM sync.
AI-Assisted Development
GitHub Copilot Chat integration via OAuth with context-aware prompt building, conversation persistence and rate-limited access.
Image Generation
fal.ai integration for on-demand image generation inside SaaS platforms, as part of real business workflows.
Open Source
Tooling, experiments and reference architectures I keep public on GitHub.
Impact
01
HealthTech
Medication management with AI-powered OCR, clinic management systems and LGPD-compliant patient data architecture.
02
Solar Energy
Multi-tenant franchise management with automated royalty calculations, ad campaign orchestration and financial sync.
03
Sports & Gaming
Fantasy sports SaaS with real-time match integration, and academy management with multi-role athlete tracking.
04
Education
Academic social platform with intelligent portal synchronization, AI chat integration and privacy-first data architecture.
05
Enterprise SaaS
Production multi-tenant platforms with role-based access, real-time communication and automated business workflows.
Contact
Open to new projects, opportunities and collaborations — whether you need a full product built from scratch or AI integrated into systems you already run.
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