Available for freelance projects

I turn ideas into digital solutions.

I'm Saymon Oliveira de Castro, a Full Stack developer. I build modern applications, smart systems and digital experiences that bring together performance, design and software engineering.

Let's build your projectSee my work

You talk directly to me, no middlemen.

S·O·C--:--

Saymon

Oliveira de Castro

Role: Full Stack
Based in: Brazil
Status: Open to projects
Languages: PT · EN

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Services

Digital solutions built around your business.

Every project starts with understanding what you need to solve. From there, I build the right solution for where your business is today: well made, clear and ready to grow.

01
Websites & Landing Pages
Modern, fast and responsive pages that present your brand clearly and turn visitors into real opportunities.
Great for
- Presenting your company
- Launching a product
- Generating leads
02
Web Apps & SaaS
Custom applications, admin panels and complete platforms, built on a solid foundation that keeps up as your business grows.
Great for
- Digital products
- Customer portals
- Online operations
03
API Development
The layer that securely connects your apps, systems and partners: integrations, user sign-in and well-organized business rules.
Great for
- Connecting systems
- Mobile & web apps
- Secure access
04
Dashboards & Management Systems
Your information in one place, on clear screens that make day-to-day tracking easier and help you make better decisions.
Great for
- KPIs
- Internal control
- Reports
05
Automations & Integrations
Tools that cut down manual, repetitive work and let your systems exchange information on their own, with fewer errors and more time for what matters.
Great for
- Less rework
- Synced data
- Faster processes
06
AI-Powered Solutions
AI features built into your product or daily routine, such as assistants, text and document analysis, and smarter workflows.
Great for
- Virtual assistants
- Documents
- Customer support

Facing a different challenge? Let's talk it through.

Tell me about your project

About me

Autonomy to solve problems, care to build things right.

Freelance services are provided independently and are not affiliated with WEG.

I'm a Full Stack developer, and I enjoy watching an idea become something that truly works. I'm drawn to complex problems and to the details that set a well-built solution apart from an ordinary one: clean code, tests, architecture and a good experience for the people using it.

I studied Systems Development through the CentroWEG program, in partnership with SENAI in Jaraguá do Sul, from 2023 to 2025. Today I work at WEG Drives & Controls, in the quality department of WEG Automação, where I'm the only developer in my section.

That responsibility calls for real autonomy: understanding each need, proposing a path forward and owning the solution. My day-to-day experience spans frontend, backend, process automation, systems integration and infrastructure.

I bring the same approach to freelance work: clear communication, initiative and a commitment to quality in every delivery.

Journey

2023 — 2025
Systems Development program
CentroWEG in partnership with SENAI · Jaraguá do Sul
Currently
Developer at WEG Drives & Controls
Quality department, WEG Automação
The only developer in the section
Alongside
Freelance projects
Websites, systems and custom solutions for companies and entrepreneurs

Recognition · 2025

Quick Kaizen standout at WEG's Kaizen Olympics

I was recognized as a standout for Factory VIII in the Quick Kaizen category, with the project “Rota WMR – Fluxo Axial”. The category honors fast, practical improvements proposed and implemented by the people who work with the process every day, as part of WEG's continuous improvement system.

Quick Kaizen
Factory VIII
Continuous improvement

Initiative
I like taking on complex problems and finding the best way to solve them before they grow.
Quality
Clean code, tests and good practices are part of the process, not an extra.
The full picture
Frontend, backend, automation and infrastructure: I understand how every piece fits together.
Languages
Native Portuguese and intermediate English.

Freelance services are provided independently and are not affiliated with WEG.

Stack

The tools I build with.

A modern, proven ecosystem, chosen to deliver applications that are fast, secure and easy to maintain.

Frontend

Fast, accessible and responsive interfaces.

React
Next.js
TypeScript
JavaScript
HTML
CSS
Tailwind CSS

Backend

Business rules, services and integrations.

Node.js
Java
Spring Boot
Python
Django
Flask
REST APIs

Databases & tools

Well-modeled data and version control.

PostgreSQL
Prisma
Git
GitLab

DevOps & infrastructure

Containers, networking, environments and continuous delivery.

Docker
Kubernetes
Rancher
AWS
CI/CD
Networking

Software engineering

Practices that keep quality high.

Testing
Clean Code
Best practices
Software architecture
Systems integration

Projects

Selected work.

Much of what I build professionally is internal and confidential. That's why you'll only find public projects here, cleared for sharing.

litoral-bordados

Company website · Landing page2026

Litoral Bordados

Company website for a custom embroidery business, with its own visual identity and a signature animation at the top of the page: a needle stitches the brand mark, one stitch at a time.

Highlights

Hand-built “thread to stitch” animation in SVG and CSS
Honors reduced-motion preferences and includes a pause control
Inertia scrolling and parallax between sections
Built as a static site, set up for deployment on Cloudflare

Tech stack

Next.js
React
TypeScript
Tailwind CSS

View repository

More projects on the way

New work shows up here as soon as it's finished and cleared for sharing. In the meantime, my public repositories are on GitHub.

View GitHub profile

How I work

A simple process, from first contact to delivery.

Transparency at every step, so you always know what's being built and why.

01
Discovery
We talk about your idea, the problem it solves and the goals you want to reach.
02
Planning
Together we define the solution, the scope and the priorities, so everything is clear before work begins.
03
Development
I build the application with a focus on quality, organization and communication, and you follow along as it evolves.
04
Delivery
We run the necessary checks and get the solution ready to be used.

Timelines and pricing are agreed on together, once we understand the project's scope.

Contact

Got an idea? Let's make it real.

Whether you need a website, a system or a custom solution, let's talk about what we can build together.

Chat on WhatsApp

I turn ideas into digital solutions.

Websites & Landing Pages

Web Apps & SaaS

API Development

Dashboards & Management Systems

Automations & Integrations

AI-Powered Solutions

Journey

Quick Kaizen standout at WEG's Kaizen Olympics

Initiative

Quality

The full picture

Languages

Litoral Bordados

Highlights

Tech stack

More projects on the way

Discovery

Planning

Development

Delivery

Got an idea? Let's make it real.

Share your idea

Websites & Landing Pages

Web Apps & SaaS

API Development

Dashboards & Management Systems

Automations & Integrations

AI-Powered Solutions

Journey

Quick Kaizen standout at WEG's Kaizen Olympics

Initiative

Quality

The full picture

Languages

Litoral Bordados

Highlights

Tech stack

More projects on the way

Discovery

Planning

Development

Delivery

Got an idea? Let's make it real.

Share your idea