HMDeveloper

Featured projects

Real-world systems built for production, with backend architecture, API integrations, automation, and platform engineering.

Backend & Integrations

Electronic Real-Estate Registry & Digital Signature SaaS

Multi-tenant B2B SaaS platform connecting administrators, notary offices, banks, and buyers/sellers through the complete legally-valid electronic real-estate registry cycle.

ONR SOAP integration
ICP-Brasil digital signature (Lacuna, IntegraICP, IdRC)
6 role-based portals
Immutable audit trail & LGPD compliance
FastAPISQLAlchemy 2PostgreSQL 17KafkaCeleryRedisReactAngular 19Docker ComposeAWS (S3/SQS/ECS)Nginx
E-commerce Platform

Vehicle Data Lookups & Payments E-commerce

E-commerce platform for vehicle and driver data lookups, with catalog, checkout, history, and real-time payment status.

Dual-token authentication
HttpOnly/Secure cookies
Secure external-API proxy
Real-time payment status via SSE
Angular 20TypeScriptTailwind CSSNode.js 20ExpressPostgreSQL 17Docker ComposeNginx
SaaS Platform

UniCETREX: Medical education platform

Platform for a postgraduate medical education company (videosurgery, endoscopy, laparoscopy), with a public site, lead capture, enrollments, payments, and role-based portals.

6 role-based portals (admin, sales, finance, academic, professor, student)
WhatsApp + CRM lead capture
Cielo payments (PIX, credit, boleto)
QR-code check-in & commission tracking
React 19TypeScriptViteFastAPIPython 3.13SQLAlchemy 2AlembicPostgreSQL 17RedisDocker ComposeGitHub Actions
Fullstack Platform

GoInsiders: Creators, affiliates & campaigns

Platform for brands and content creators to manage campaigns, track affiliates, publish to Instagram and TikTok, validate KYC identity, manage digital wallets, and access real-time analytics.

KYC identity validation
Instagram & TikTok publishing
Digital wallet & creator payouts
Real-time campaign analytics
NestJSPrismaPostgreSQLReactTypeScriptAWS S3CaddyDockerRedis
Mobile & Web Platform

Alive Tour: Premium travel agency platform

Evolved from a landing page into a full operations platform for a premium travel agency, with a public site, admin CMS, role-based portals, leads, and loyalty.

16-screen admin CMS
5 operational portals with role-based access (6 roles)
Budget-based trip discovery tool
Loyalty program & WhatsApp lead follow-up
ExpoReact NativeExpo RouterNativeWindTypeScriptReact Native WebFirebase (Firestore, Auth, Cloud Functions, Storage, Hosting)
AI & Automation

JARVIS: Personal AI, agents & automation lab

Personal, voice-first AI platform running on-premises, in daily use as a hands-on lab for applied AI, autonomous agents, and home automation.

28 specialized agents
Semantic memory with RAG & reranking
Local LLM routing with cloud escalation
Home Assistant integration
Bilingual desktop HUD (EN/PT-BR)
PythonFastAPIReactTauriPostgreSQL (pgvector)RedisOllamaMLX WhisperKokoro/Piper/XTTSMCP serversDocker Compose
Automation & IoT

Self-hosted home automation platform

Self-hosted smart home run as a production system, with git-versioned config, hot-reload deploys, and automation packages for aquarium, irrigation, blinds, dog health, and per-area voice.

13 automation packages (aquarium, irrigation, blinds, dog health, energy, night security, voice)
Three ecosystems (ESPHome/ESP32, Zigbee, Sonoff/Tuya) behind a single MQTT broker
Deploys that pick a hot reload over a restart, keeping a 24/7 system online
Long-term series in InfluxDB v2 and analytics in Grafana
Home AssistantESPHomeESP32MQTT (Mosquitto)Zigbee2MQTTSonoffTuyaInfluxDB v2GrafanaDocker Compose
Backend & Integrations

Electronic service invoice (NFS-e) issuer with government integration

System for issuing electronic service invoices integrated with the Federal District government, covering customer records, issuance, lookup, and status tracking.

Integration with the Federal District tax service, signing the XML with a PKCS#12 certificate
Password hashing (bcrypt) with JWT authentication
Homologation and production selected by configuration
React frontend with Zustand and TanStack Query served behind Caddy
FastAPISQLAlchemyPostgreSQLJWT (python-jose)lxmlcryptographyReactTypeScriptViteZustandTanStack QueryTailwind CSSCaddyDocker Compose
Observability & Automation

Operations dashboard for local services and client assets

Single operational health panel tracking on-machine AI services and, on the client side, site uptime, domain expiry, and TLS certificate validity.

Real-time updates over WebSocket
Scheduled uptime, WHOIS and TLS certificate checks
Payment-slip parsing that pulls the PIX QR code (PyMuPDF and pyzbar) and the PDF text (pdfplumber)
PDF reports generated from the data, with series charted in Recharts
FastAPIWebSocketsSQLModelAlembicAPSchedulerAnthropic SDKpdfplumberPyMuPDFpyzbarReportLabReactTypeScriptRechartsDocker Compose
Public Sector & Auditing

Audit and public-sector workforce management suite

Four web systems for a public-sector organisation: auditing with field mining over configurable layouts; performance appraisal with stages, a review board and reconsideration requests; Official Gazette search; and member re-registration.

Elasticsearch indexing and search in the audit system, over a purpose-built indexer
Appraisal engine modelling stages, factors, scores and conclusive opinions with a reconsideration flow
PDF generation from the results
Role-based access control in the appraisal and re-registration systems
Laravel 8 and 9PHPLaravel NovaVue 2 and Vue 3Nuxt 2Elasticsearch (Laravel Scout)Laratrust (RBAC)wkhtmltopdf (Snappy)dompdfMySQLNginxDocker
Portals & Content Management

Institutional and membership portals for a professional association

One Laravel codebase delivered as two portals, one for the national association and one for its regional branch, each with a public site (publications, events, member benefits, board) and an administrative back office.

Back office with role-based permissions over all institutional content
Member and benefit registration
Image processing on upload
The same codebase running as two installations that differ by a handful of routes
LaravelPHPBladejQuery DataTablesLaratrust (RBAC)Intervention ImageBootstrapMySQLDocker Compose
Projects | Hugo Minari Diniz | Backend & Fullstack Engineer