Welcome to my portfolio, I am
Pedro Crelier
Software Engineer
About me...
Software Engineer with 7+ years of experience specializing in web platforms and internal systems. I design and build reliable solutions with a strong emphasis on performance, scalability, and clean architecture.
I develop systems with a product-oriented approach, balancing technical decisions with user experience. I prioritize clarity, usability, and efficiency, ensuring that the solutions I build are not only functional but genuinely valuable for the people who rely on them daily.
Front-end
- Javascript
- Typescript
- React.js
- Next.js
- WordPress
- Tailwind
Databases
- SQLite
- MongoDB
- MySQL
- PostgreSQL
- Redis
Back-end
- Python
- Golang
- Node.js
- PHP
- Laravel
DevOps
- Git
- Docker
- AWS
- Cloudflare
Be the change you want to see in the world
Professional Experience
Locar Soluções e Mobilidade Ltd.
2026–Present — Software Engineer
- Delivered a full-scale internal ERP system as part of a 3-person engineering team, consolidating HR, payroll, and fiscal operations into a unified platform from the ground up.
- Architected and implemented core back-end business logic covering employee time tracking, banked hours management, and complex payroll calculations, including overtime rules, benefits, deductions, and edge-case handling.
- Built and maintained integrations with third-party invoicing APIs, owning the full request/response lifecycle, data validation, and error handling to ensure reliable electronic document processing in compliance with regulatory requirements.
Nitinfo
2019–Present — Founder & Developer
- Founded and operate a freelance software consultancy delivering end-to-end web solutions for clients internationally, including landing pages, e-commerce platforms, and content management systems.
- Managed cloud and self-hosted infrastructure for small businesses and individuals, including provisioning, configuration, and maintenance of back-end services.
- Diagnosed and resolved complex system-level issues across OS, hardware, and network layers using structured root-cause analysis and systematic troubleshooting.
Associação Pestalozzi de Niterói
2020 - 2023 — IT Support
- Delivered technical and administrative support for a medical clinic, including report transcription and digital/physical file management.
- Developed Python scripts to automate reports, file organization, and internal workflows, significantly reducing time spent on repetitive tasks.
Freelance Projects
Displaying publicly available work; additional work under NDA not rendered in the map.
Personal Projects
Websites
Chronotune
A fun and addicting web game where you have to guess the release date of random songs from Spotify's database. Test your music knowledge across decades and genres.
Tori's Basement
My personal corner of the web, featuring a media library, music activity, a journal, projects, and a guestbook.
Software
Scriptorium
Scriptorium is a Windows desktop application that lets you create tests and quizzes for anything you want.