Autonomous systems
Emais Network platform
Management platform for in-person business networking — events, tickets, membership and multi-franchise finance, moving real money.
nearly 200
active members using the platform to pay dues and get into events
- Conditions
- as of August 2026, a little over two months after launch · Pix, card and boleto · multi-franchise finance isolated by RLS
- Role
- Developer, with João Moreti
- Context
- Client of Dark Marlin, my dev shop
- Period
- 2026
- Status
- In production, with real payments
The problem
In-person business networking groups live on two things: filling the event and collecting the monthly fee. When that runs on spreadsheets and gut feel, money goes missing and so do people — nobody knows who paid, who showed up, and how much each franchise brought in.
Emais Network is a client of Dark Marlin, the dev shop I co-own. The product had to cover the whole cycle: sell tickets online, track who is a member, run the event and close the books for each franchise.
The decision that changed the project
Multi-franchise is where this kind of system usually leaks. The temptation is to filter
by franchise in the query — and one forgotten where is enough for one franchise to see
another one’s revenue.
I pushed the isolation down to Row Level Security in PostgreSQL. The rule now lives in the database, not in the application: even if a query forgets the filter, the database doesn’t return the row. The cost is a stricter data model and more annoying migrations. The gain is that the worst possible mistake stops being possible.
The result
Live since May 28, 2026, with real payments via Pix, card and boleto, with no downtime, and close to 200 active members today. End-to-end coverage with Playwright on the flows that involve money — checkout, renewal and discount — because that’s where a bug actually costs money.
The credit is shared: I built the platform together with João, my partner at Dark Marlin.