Blog
All articles. All pillars. All authors.
OAuth Authentication: Google, GitHub, Microsoft, and Apple
How we implemented OAuth with Google, GitHub, Microsoft, and Apple on 0fee.dev, including Apple's popup flow. By Juste A. Gnimavo.
The Feature Request Module: Developer Feedback Loop
How we built the 0fee.dev feature request system with 4 tables, 20 API routes, upvoting, and priority levels. By Juste A. Gnimavo.
Financial Compliance: OHADA 10-Year Retention Rules
How OHADA's 10-year document retention rules shaped 0fee.dev's deletion policy and archive system. By Juste A. Gnimavo and Claude.
Security Audit: What We Found and How We Fixed It
A transparent look at the security weaknesses we found in 0fee.dev and the systematic fixes we applied. By Juste A. Gnimavo and Claude.
Zero-Decimal Currencies: When 5000 Means 5000
How 0fee.dev handles zero-decimal currencies like XOF and JPY: the precision bugs we found and fixed, and why int(round()) matters. By Juste A. Gnimavo.
The Checkout Widget Redirect Problem: Popups, Polling, and postMessage
How we solved the redirect problem in 0fee.dev's checkout widget using popups, polling, and postMessage. By Juste A. Gnimavo and Claude.
WAL Race Conditions and SQLite Lessons
The WAL mode race conditions that plagued 0fee.dev's SQLite database and ultimately pushed us to PostgreSQL. By Juste A. Gnimavo.
Amount Display Bugs: When 5 USD Shows as 0.05
The amount display bugs that plagued 0fee.dev: wrong divisions, integer vs float, and how we fixed them across 50+ files. By Juste A. Gnimavo.
Fixing Infinite Loops and 500 Errors
The infinite loops and 500 errors that struck 0fee.dev across multiple sessions, and how we traced and fixed each one. By Juste A. Gnimavo.
86 Sessions in 80 Days: The Complete Build Timeline
The complete build timeline of 0fee.dev: 86 sessions across 80 days, from first commit to production deployment. By Juste A. Gnimavo.
The December 12 Marathon: 13 Sessions in One Day
13 development sessions in a single day: the December 12 marathon that transformed 0fee.dev from prototype to platform. By Juste A. Gnimavo.
Christmas Day Debugging: i18n, SDKs, and Currency Bugs
Sessions 064-067 on Christmas Day 2025: building i18n, rewriting SDKs, and fixing currency bugs from Abidjan. By Juste A. Gnimavo.