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Jet ski rentals from listing to payout, in production.

Context

A two-sided marketplace: on one side people with an idle jet ski, on the other people who want a day on the water. Three applications, web, iPhone and Android, over a single backend.

Result

The full journey was executed end to end against the live API, payment and refund included, and the measured ruler from push to code in production is fourteen minutes.

• Java
• Spring Boot
• PostgreSQL
• Next.js
• Expo
• Stripe Connect

The wallet is charged before the message leaves.

Context

A send-and-receive layer between the products and the official Meta API, with a dedicated number and brand per customer.

Result

Two products in production consume the hub by API key, each keeping its own brand in the conversation with the end customer.

• Node.js
• Fastify
• BullMQ
• Redis
• PostgreSQL
• Meta Cloud API

The price that pays the owner’s hour, worked out without an account.

Context

A financial compass for sole traders and small businesses: the arithmetic of what is actually left, redone on its own when materials go up.

Result

Visitors see their own number before deciding whether they want an account.

• Next.js
• TypeScript
• Prisma
• Turso
• Stripe
• Mercado Pago

The report refuses to print outside the rule.

Context

A functional assessment of children’s communication, used in practice and delivered as a report for the family to read.

Result

In real clinical use, with an audit trail that prevents deleting an assessment that already has history.

• Rust
• Axum
• PostgreSQL
• Next.js
• next-intl

The server decides, the browser only draws.

Context

A 2D multiplayer football game that runs in the browser, with quick matches, offline training and a duel ladder.

Result

Live, with online matches, training without an account and duels, with one single source for game logic, proven by both modes at once.

• TypeScript
• Colyseus
• Phaser
• Vite
• PostgreSQL
• Fly.io