SELECTED SYSTEM / 01IN PRODUCTION
01/ 03
NestJS · Multi-tenant · MongoDB · Redis
1.5k+ users45k+ workouts24k+ diet records
LEONARDOVANNI.
Backend Engineer
Systems built for production. Architecture, performance and care in every detail.
Form study / 001∞
Move your cursor. Shift your perspective.Scroll to explore↓
From idea to impact
Turning complexity into experiences that make sense. One detail at a time.
Keep exploring
(01)Selected case studies
Selected
work.
Real problems. Systems at scale. A closer look at what I build.
SELECTED SYSTEM / 02IN PRODUCTION
02/ 03
NestJS · ERP integration · Security · MongoDB
61k+ proposals13k+ financings5k+ contracts
SELECTED SYSTEM / 03IN PRODUCTION
03/ 03
NestJS · Google API · Stripe · Microservices
Native AI agentsGoogle Calendar syncStripe subscriptions
Draft archive04—07 +
Projects in preparation
(02)About
Precise logic.
A human perspective.
Backend engineer specialized in high-availability systems, where performance meets security. From data modeling to automated cloud deployments, I turn business requirements into architecture that holds up in production.
Between the complexity of a system and the simplicity of a great experience.
Contact4+Years of experience
30+Systems built
99.9%API uptime
(03)What I do
The invisible
makes a difference.
Four disciplines that support a product after it leaves the prototype.
More than writing code: architecture design at scale, maintainability and the bridge between business needs and technical solutions.
Modular architectureFrom idea to production01 02 03
Architecture
Every system starts in pieces: requirements, domains, API contracts and decisions that need to withstand the future.
Data & caching
The pieces gain structure — performant schemas in PostgreSQL and MongoDB, with Redis keeping latency in check.
Deployment
Everything connects: CI/CD with GitHub Actions, Docker and AWS. Resilient, observable and ready to scale.
(04)Experience
A journey
in the making.
2024 — Present01
Epicora Software House
Mid-level Backend DeveloperIntelligent, tailored software solutions with NestJS and TypeScript. Focused on code optimization and performance, working with DevOps, SQL and NoSQL, AWS and more.
Distributed systems & performance
2022 — 202402
Questor Sistemas
Web DeveloperFull-stack development with C#, TypeScript, .NET, Entity Framework and PostgreSQL. Experience with web scraping using PHP, Laravel, MongoDB and Docker.
Full-stack product & automation
202203
Hub2b
Support AnalystTechnical support and analysis for e-commerce integration platforms, identifying systemic bottlenecks and optimizing customer workflows.
Integrations & critical operations
(05)Education & repertoire
Solid foundations.
Endless curiosity.
01Bachelor’s degree
Technology in Systems Analysis and Development
UniSENAI Santa Catarina
02Technical education
Systems Development Technician
SENAI/SC
03Certifications
Cisco Networking Academy
Cisco
Languages
PTPortugueseNative
ENEnglishAdvanced
ESSpanishBasic
Also in the repertoire
(06)Location
From Chapecó,
to wherever you are.
LocationChapecó, SC · Brazil
TIMEZONEUTC-03:00 · UTC−03:00 BR
STATUSAVAILABLE
(LAB / 01) Interactive laboratoryOne click.
One click.
A whole system.
You control the frontend. Discover everything on the other side — and what happens when something breaks.
Choose an action. Follow the signal. ↙ClientNestJS APIData & jobsIntegrations
orbit.local
WORKSPACE / STUDIORead projects
Read twice. Watch the cache on the second request.
Swipe to explore the architecture →
Ready to explore
GET /api/projects#000
- ↳
Your first click starts a story.client → guards → service → response
Server response—
// The response will appear here.
Requests0
Database reads0
Writes0
Pending jobs0
Modeled time—
(07) Contact
Let's build
something solid
Open to new opportunities. If you have a question or just want to say hello, I’ll do my best to reply.