Blog — engineering notes · Makhloof Studio

// Blog

Engineering notes from the build.

Field notes on architecture, performance, and shipping real systems. New posts land here — drop an .mdx file in /content/blog to publish.

paymentspostgresql
Handling money correctly: idempotency, append-only ledgers, and concurrency
Payments don't fail loudly — they fail by double-charging, double-crediting, or quietly losing a record. Here's how I build money flows that are provably correct under retries and concurrency, drawn from three production platforms.
Jun 2, 2026 4 min
saaspostgresql
Selling one product to many tenants: Postgres Row-Level Security in production
Multi-tenant SaaS lives or dies on one promise — no customer ever sees another customer's data. Here's how I enforce that promise in the database itself, not in application code, across three shipped platforms.
May 20, 2026 4 min
architectureflutter
One backend, every device: shipping Flutter and Next.js on a shared API
Reaching customers on web, iOS, and Android usually means three teams and three sources of truth. It doesn't have to. Here's how I ship native mobile and web from a single backend — and the patterns that keep it from collapsing into chaos.
May 6, 2026 4 min

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