Full-stack development & infrastructure

Full-stack developer, infrastructure specialist, and founder of HL Tech.

Hi, I am Marcelino. Software Engineer 

I build APIs, SaaS platforms, admin panels, automation flows, and deployment environments for businesses that need real software running with clarity.

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APIs
SaaS
Dashboards
Mobile/PWA
Infrastructure
Deploy
Photo of Marcelino Gustavo
Software in operation
Front API Infra
REST Integrations
Linux Environment
Meet the mind behind it

About Me

From code to production environments

The Technical Journey

My work is guided by solving concrete problems: organizing workflows, turning ideas into systems, and keeping applications supported by thoughtful infrastructure.

I study Software Engineering and lead HL Tech. My focus is on APIs, SaaS platforms, admin panels, automation, deployment, and infrastructure.

3º SOFTWARE ENG.
STUDENT
HL TECH &
SERVER FOUNDER
APIs, admin panels, and SaaS with clear workflows Separation between front-end, API, and database Deployment, logs, and backups planned from the start
View Resume
Stack & Infrastructure

Technology chosen to deliver real systems

The stack is organized by layer: interface, back-end, data, mobile, deployment, infrastructure, and operational tools.

Front-end

Responsive interfaces, technical SEO, and user experience.

HTML5 CSS3 JavaScript TypeScript React Next.js Vite Tailwind CSS Bootstrap Responsive UI Technical SEO Web Performance

Back-end

Business rules, APIs, authentication, and integrations.

PHP Node.js Python Java C# REST APIs Webhooks JWT/Auth MVC Payments Uploads and media Validation and security

Databases

Modeling, queries, indexes, migrations, and data preservation.

MySQL MariaDB PostgreSQL Firebase Redis Relational modeling Indexes Backups Migrations Optimized queries

Mobile/PWA

Operational apps, check-in, QR Code, and mobile experiences.

Flutter Kotlin PWA Android iOS WebView Push Notifications QR Code Operational/check-in apps POS devices

DevOps & Deploy

Publishing, web servers, SSL, version control, and basic observability.

Docker Docker Compose Nginx Apache PHP-FPM Linux Ubuntu Server Cloudflare Cloudflare Tunnel SSL/TLS Git GitHub Basic CI/CD Logs Monitoring Backup

Infrastructure

Organized environments for operations, testing, and controlled growth.

Proxmox VE LXC Containers VPS Dedicated server Networks DNS Firewall SSH Reverse Proxy Storage NVMe/HDD Server sizing Stability focus

Tools

Tools for building, diagnostics, design, and tracking work.

VS Code Android Studio Figma Postman/Insomnia Terminal Trello GitHub Chrome DevTools
Real operations

Infrastructure that supports the software

Better projects happen when front-end, API, database, deployment, logs, and backups are planned as parts of one system.

Operational flow organized by layer
01
Entry

User, domain, and Cloudflare

Access goes through domain, DNS, SSL, and tunnel when the operation requires controlled exposure.

Domain DNS SSL/TLS Cloudflare Tunnel
02
Application

Front-end, API, and authentication

Interface and business rules stay separated to make maintenance, deployment, and evolution clearer.

Front-end API Auth Webhooks
03
Data

Database, storage, and uploads

The database remains protected behind the API, while files and media are treated as part of operations.

MariaDB/MySQL Uploads Storage Backups
04
Operations

Logs, backups, and maintenance

Predictable deployment, error traces, and recovery routines help the system operate with stability.

Logs Backup Monitoring Deploy
Operational base

From server to published code

Infrastructure combines Linux servers, containers, web servers, DNS, SSL, logs, and backups to support real systems.

Proxmox VE

Own lab and operational environments with virtualization and resource separation.

LXC / Docker

Containers to isolate services, simplify deployment, and reduce coupling between layers.

Linux

Ubuntu/Linux servers focused on stability, permissions, logs, and maintenance.

Nginx / Apache

Nginx, Apache, and PHP-FPM configuration according to the type of application.

DNS & Tunnel

Domains, subdomains, DNS, Cloudflare, and secure tunnels when needed.

Operational security

Good practices for access, firewall, SSL, backups, and separation between front, API, and database.

Separation between front-end, API, and database Focus on operational stability Backups and logs as part of the project Planned growth without unrealistic promises
HL Tech Ecosystem

High-Performance Solutions

Deliverables for businesses that need digital presence, operational systems, APIs, automation, and infrastructure working together.

Web Systems & SaaS

Dashboards, restricted areas, operational flows, and business rules for digital products.

  • Admin dashboards
  • Restricted areas
  • Operational flows

APIs & Integrations

REST APIs, webhooks, authentication, payments, automation, and organized data.

  • REST APIs
  • Webhooks
  • Authentication

Infrastructure & Deployment

Linux servers, Docker, Nginx or Apache, Cloudflare, SSL, logs, and backups.

  • Docker
  • Linux
  • Cloudflare
  • Logs and backups

Portfolio, Websites & Landing Pages

Digital presence, technical SEO, performance, and conversion for services and brands.

  • Institutional websites
  • Landing pages
  • Technical SEO

Apps, PWA & Mobile Operations

Operational apps, check-in, QR Code, Android, iOS, PWA, and WebView.

  • PWA
  • Operational apps
  • QR Code

Automation & Bots

Automated flows, customer service, and organized repetitive tasks.

  • Automation
  • Bots
  • Integrations

Technical Consulting

Diagnosis, architecture, stack selection, project review, and execution planning.

  • Diagnosis
  • Architecture
  • Execution plan

Portfolio & Case Studies

Featured case
View Project

Viral Tickets

infra

Ticketing platform with modular architecture, centralized API, isolated database, and dedicated infrastructure for scalable operations.

Architecture
API Admin Producer Check-in POS Infra Isolated database
ProblemEvent operations needed to separate sales, management, check-in, and payments into reliable layers.
SolutionAn ecosystem with an API, dashboards, customer frontend, gate app, and isolated data responsibilities.
ResultA technical foundation ready to scale modules and integrate commercial operations safely.
RoleArchitecture, backend, integrations, and infrastructure.
PHP API REST MariaDB Arquitetura Modular
View case study public
View Project

HL Tech

web

HL Tech institutional website presenting software, cloud, servers, networking, and consulting with a clear commercial message.

ProblemThe brand needed to explain software, cloud, and infrastructure cohesively.
SolutionInstitutional presence with organized services and B2B communication.
ResultA clearer commercial message for acquiring technical projects.
RoleStrategy, content, frontend, and deployment.
Site Institucional UX/UI Infraestrutura Conversão
View live public
View Project

Anthony Acioly Nutri

web

Premium institutional website for a clinical sports nutritionist, focused on authority, conversion, and professional positioning.

ProblemThe professional needed to convey authority and convert visitors into qualified leads.
SolutionResponsive website with a clear narrative, service sections, and direct contact calls.
ResultA more professional digital presence focused on conversion.
RoleUI, frontend, technical SEO, and publishing.
Site Institucional Landing Page UX/UI Conversão
View live public
View Project

Espaço Saúde

web

Institutional website for an aesthetics and dentistry clinic, focused on credibility, services, and lead generation.

ProblemThe clinic needed to present services credibly and make appointments easier.
SolutionResponsive institutional website focused on clarity, services, and quick contact.
ResultA more organized and accessible local brand for new patients.
RoleFrontend, content, local SEO, and publishing.
Site Institucional UX/UI Responsivo Conversão
View live public
View Project

Japa Designer

web

Institutional portfolio for design services, visual identity, and promotional materials.

ProblemThe portfolio needed to highlight visual work without making commercial contact difficult.
SolutionResponsive experience with a gallery, strong visual language, and conversion channels.
ResultA more mature presentation for creative services.
RoleFrontend, UI, and publishing.
Portfólio Design Gráfico UX/UI Responsivo
View live public

Home Server Lab

infra

Internal lab for self-hosted services, networking, deployments, and isolated environments.

ProblemDeployments, tunnels, internal services, and isolation needed validation before client delivery.
SolutionLab with Linux, Docker, Nginx, Cloudflare Tunnel, and environment segmentation.
ResultAn applied learning environment for ongoing technical validation.
RoleArchitecture, networking, servers, and operations.
Infraestrutura Linux Self-Hosted Redes
<i class="fas fa-lock"></i> Internal Project public

What Clients Say

Leila Amanda

Leila Amanda

Espaço Saúde SDI

"We were very satisfied with the website. The clinic presentation became more professional, organized, and conveyed exactly the credibility we wanted for our patients."

Anthony Acioly

Anthony Acioly

Anthony Acioly Nutri

"The website went beyond what I imagined. It combined aesthetics, professionalism, and clarity in presenting my services, which significantly strengthened my digital presence."

Daniel Welliton

Daniel Welliton

Viral Tickets

"The Viral Tickets structure brought a much more professional direction to the project. The separation between frontend, API, and operations made the platform stronger and ready to grow."

Japa Designer

Japa Designer

Japa Designer

"My portfolio gained much more identity and presence. The attention to aesthetics, project organization, and visual experience helped showcase my work even better."

Common Questions

Frequently Asked Questions

Does HL Tech repair computers or phones?

No. HL Tech is focused on the business market. The work is centered on Software Engineering, Automation, and Server Infrastructure. Hardware involvement is limited to consulting and equipment sizing for companies and datacenter-like environments.

What is HL Server?

HL Server is a private infrastructure initiative based on technologies such as Proxmox and Docker. The goal is to organize environments, separate responsibilities, and monitor operations with logs and backups.

What technologies are part of the stack?

I work with scalable architecture across modern front-end, PHP and Node.js back-ends, SQL databases, Linux, Docker, Nginx, and cloud or self-hosted environments.

How does a project start?

It starts with a technical alignment conversation to understand the operational bottleneck. From there, I define architecture, scope, priorities, and a clear execution plan.

Let's Talk?

Have a project in mind? Fill out the form or reach me directly on WhatsApp.

WhatsApp

(82) 99314-0076

Location

Maceió, AL - Brazil