Building JoBoEco, Part 5: certificates, proceedings, and the first real event

Part 5 of 5 — How certificate verification works without a database using HMAC-SHA256, the proceedings with BibTeX export, QR Code check-in, and what I learned at the first real event using the platform.

Building JoBoEco, Part 4: the eligibility engine

Part 4 of 5 — The most complex part of JoBoEco was not the payment or the deploy — it was modeling the eligibility rules for paper submissions. Here are the design decisions and why truly isolating business logic is harder than it looks.

Building JoBoEco, Part 3: Pix in practice

Part 3 of 5 — How I implemented Pix payments in JoBoEco with MercadoPago — from dynamic QR Code to production webhooks, through all the edge cases that only surface when real money is involved.

Building JoBoEco, Part 2: going all-in on Cloudflare

Part 2 of 5 — Why I chose Next.js on Cloudflare Workers with D1 and R2 instead of the obvious Vercel + PostgreSQL path. The real tradeoffs, what worked, and what I would change today.

Building JoBoEco, Part 1: the problem that justified everything

Part 1 of 5 — How frustration with spreadsheets, Google Forms, platform fees, and processes scattered across N tools led me to build a full academic event management platform.