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
View resume

Be the change you want to see in the world

Professional Experience

Locar Soluções e Mobilidade Ltd.

2026–PresentSoftware 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–PresentFounder & 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 - 2023IT 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

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    Blog image

Software

    Scriptorium image

Blog

Featured blog post:

Building My Own Blog

This blog is my personal wiki, or a digital garden — a place for ideas, memories, and experiments. It’s also a technical project: a Markdown-powered, statically generated site with dynamic comments, built in just six days using Next.js, Prisma, and PostgreSQL.

More than just a blog, it’s proof that starting small, learning from failure, and shipping early can lead to something meaningful.

A Failed Attempt

My first attempt at creating a personal blog — or really, a diary — was back in 2021. It was only my second web programming project, but one I truly invested time and energy into. I called it "my-diary" — not the most creative name, but the idea was simple: keep it running locally and never publish it. Why? I just wanted to practice my programming skills while building something useful to me. After all, I’ve always loved writing.

The problem? I never got it working. Turns out, dynamically reading text files with React wasn’t easy for a beginner. I eventually gave up on the project… until now.

The Second Attempt

By the end of May 2024, I wanted to start playing games again — especially old ones from my childhood — and write reviews about them. I planned to revisit how they hold up today and share my thoughts, videos, and screenshots with friends. But where?

If you don’t know me, I’m not really into social media. Platforms like Twitter/X and Facebook are ones I consciously avoid. I believe they’re harmful to mental health and rarely offer meaningful value.

So I decided to build my own platform. At first, I was skeptical — my last attempt had failed, after all. But so much time had passed, and I’d learned so much. I told myself: “Let’s work on it for one or two days. If I can’t get the basics working, I’ll quit.” With that, I started coding on May 31, 2024.

early development img

I not only got the basics working — I built far more than I expected. Honestly, I’m still surprised I managed to create a fully functional blog with comment support in just six days. I’m proud of the result and more motivated than ever to write, now that I finally have a dedicated space for my thoughts.

Markdown Files

One of the “special” features of this blog is that all content is stored as plain text files — specifically, .md (Markdown) files.

md files

This means I can write new posts without touching a single line of code. I just create a new file, write, and save. That’s it. Well, almost, I do need to deploy the site to Vercel. Think of the local version as a draft; when I’m ready to publish, I deploy it, and the live blog updates instantly.

This approach makes the site highly scalable and easy to manage.

Programming

Of course, behind the scenes, the site runs on actual code. I used Next.js because it excels at Static Site Generation (SSG), which makes the blog fast, SEO-friendly, and perfect for content-focused sites like this.

For comments — the only dynamic part of the site — I use Prisma ORM with PostgreSQL as the database.

site code

Here’s how it works:

  • I have a Blog folder where I store all my .md files — these become the posts you read.
  • During deployment, the site scans this folder and generates static pages for each file, rendering them as blog posts.
  • Special functions run during this process to extract metadata like images, references, and backlinks.
  • Some posts have dynamic background effects — like cross-fading between images — while others use a solid color when no image is available or no special background is set.
  • There’s also a private personal folder where I keep my diary. I can access it, but no one else can. Works like magic!

Changelog

  • 2024-05-31: Started development of the site
  • 2024-06-04: Launched the site
  • 2024-06-05: Added dynamic backgrounds; began writing posts
  • 2024-06-19: Fixed comments not showing for posts in subfolders; added post-based metadata
  • 2024-07-14: Added metadata display for posts; included a “latest posts” list on the homepage
  • 2024-11-08: Introduced the Feathers feature
  • 2025-06-18: Removed the Feathers feature; relaunched the site

Get in touch

  • Linkedin
  • Github
  • Instagram
  • Email