Work - Things we have built.

A selection of web applications, native apps, and product engineering. Each one ran from discovery through launch, and several are still live and being maintained.

Case studies

Prandial

iOS Development, Applied AI

Prandial results: three ranked picks from a dinner menu, each with its reason, under a note that Claude read the menu

A menu scanner that picks what to order, with the math done on the phone

Built the full iOS app: Vision OCR, extraction into calorie bands and macro leans by Foundation Models or, in Pro, by Claude, an advisory allergen filter, and a deterministic Swift engine that ranks the menu against what's left of your day.

The free plan runs entirely on the phone. In Prandial Pro, and only with your consent, the menu's recognized text goes to Claude; the photo, your Health data and your profile stay on the device, and per-dish calories appear only as bands.

The on-device model is good at reading a menu and bad at arithmetic. So it reads and Swift counts, and the app never shows a calorie number it can't back up.

Marcello Gonzatto Birkan, Founder, Mellofattura

Looté

iOS Development, Applied AI

Looté’s Capture tab: the scene’s dialogue read into a text card, with the hard words highlighted

Language lessons from the game on your screen

Built the whole iOS app: Vision OCR grouped into sentences, a tap sheet that sends each job to iOS translation, the on-device model, Apple’s cloud or, in Pro, Claude, and SM-2 decks with a progress tab.

A share extension feeds an inbox, and Looté Pro turns a batch of prints into a queue that ends in a session recap. Games can be in eight languages, from English to Japanese, and the app speaks the same eight.

What a gamer notices is whether the translation shows up right away and whether the app still works offline. The colors tell them who wrote each answer, so nobody has to read about AI.

Marcello Gonzatto Birkan, Founder, Mellofattura

Quem Botou Essa?

Product design, web and iOS development

Quem Botou Essa? landing page with an amber stage, room creation and entry by code

Your music taste gives you away.

Secret picks, 30-second previews and guesses among friends. A music deduction game for 3 to 12 people.

A playful noir identity, a vinyl timer and a carimbo at the reveal. Next.js and SwiftUI share game state through Convex.

The challenge was to give waiting, guessing and revealing their own rhythm. Music leads the round; the interface leaves room for the conversation between friends.

Marcello Gonzatto Birkan, Product creator, Mellofattura

Project Academy

Web Product, Education Platform

Project Academy landing: build real digital products with AI, lesson by lesson

A course platform for building with AI, still in the studio

Built Project Academy as a course platform: two written titles, a five-phase method, and a lesson player with module maps, quizzes, and projects.

The product is still in development. A third course is in the studio, and the public site is offline for now.

Academy is the studio teaching how we actually build: objectives instead of steps, limits on the agent, and the human in command — while the platform itself is still being written.

Marcello Gonzatto Birkan, Founder, Mellofattura

EvenBetter

Research, Agent Skills, Accessibility

EvenBetter site: curated skills for iOS accessibility, with an audit running in the terminal

Curated agent skills for iOS UX and accessibility

EvenBetter turns Apple's HIG, Apple's accessibility documentation and WCAG 2.2 into skills the agent follows step by step: 16 skills in the iOS plugin and 49 clauses, each with its source. Planning, analysis, validation and repair each leave an artifact the developer checks before deciding.

Born as a Mackenzie graduation thesis with Daniela Brazolin Flauto, advised by Prof. Dr. Valéria Farinazzo Martins. In a study with ten iOS developers, mean SUS was 79.5. Accepted at JIIHC 2026 / 8WoSI², on the program for 10 November 2026 in Talca, Chile.

The point was never another checker. It was an interaction model where guidelines become procedures, evidence stays visible, and the developer keeps the final call.

Marcello Gonzatto Birkan, Author · Mellofattura / Mackenzie

Low Profile FC

Web Development, Motion Design, Brand Experience

Low Profile FC hero: Onde só jogam animais

An esports brand site with Motion-powered presence

Built the Low Profile FC brand site end to end: hero, roster with sound-on video, fixtures, Group C standings, and a scroll finale.

Shipped Motion + Motion+ choreography (Ticker, ScrambleText, AnimateNumber, Cursor, foil tilt) on Next.js 16 with media on Vercel Blob.

Low Profile FC is how we want brand sites to feel: sharp, loud in the right places, and engineered so every animation earns its keep.

Marcello Gonzatto Birkan, Founder, Mellofattura

Gol Contra

Realtime Product, Game UI, Mobile Experience

Gol Contra landing: create or join a lobby

Full web product + a mobile experience designed from zero

We built the entire Gol Contra web product: lobbies, roles, votes, and tracks, realtime on Convex and Next.

Mobile was designed from zero for the phone, with its own information architecture and interactions instead of a responsive redirect of the desktop flows.

We shipped the whole night: the full web game first, then a mobile experience invented for the hand instead of borrowed from the desktop.

Marcello Gonzatto Birkan, Founder, Mellofattura

Weightics

iOS Development, Data Science & ML

Weightics welcome screen: clay illustrations of a scale and a wavy line

A weight tracker that shows the trend, not the noise

Built the whole iOS app: a twelve-algorithm trend engine, Swift Charts analysis, Apple Health import and sync, a Medication mode for GLP-1 doses, weekly, monthly and yearly reports, widgets, and a SwiftUI paywall drawn from the person’s own trend.

Everything runs on the phone. Entries stay on the iPhone, with no iCloud sync, no server and no analytics, so the statistics that make the app useful never require sending data anywhere.

The number on the scale is mostly noise. The honest thing to build was the trend underneath it, with the confidence band left visible.

Marcello Gonzatto Birkan, Founder, Mellofattura

Zenoney

iOS Development, Product Design

Zenoney dashboard: the monthly budget ring

Budgeting that stays calm

Designed and built the full iOS app: monthly budgets with automatic carryover, fast categorised entry, spending insights, and a dashboard that answers one question above the fold.

The app works in English and Portuguese with locale-aware currency formatting. It keeps its data locally in SwiftData, with no account, no server, and no analytics SDK.

Most expense trackers are ledgers that make you feel behind. Zenoney is the other way round: one ring, one number, and a month that forgives the days you underspent.

Marcello Gonzatto Birkan, Founder, Mellofattura

VioletNova

Game Development, Python / Pygame, AI-assisted tooling

VioletNova Earth stage: NOVA-22 over grass with space debris HUD

A solar-system arcade where each planet rewrites the physics

Shipped Cadet Violet and NOVA-22 through nine celestial bodies with real relative gravity, quizzes, dialogue, save systems, and Hold vs Flappy controls, all in Python and Pygame under the professor’s no-engines rule.

Started at the end of March 2025 to pressure-test Claude Code and Sonnet 3.7; Midjourney for some asset exploration; original Suno soundtracks and early ElevenLabs character lines. Visual identity and pixel art by Daniela Flauto.

The professor wanted Pygame only, no engines. So the brief became a playable solar system under that constraint, and a chance to see whether Claude Code could keep up while gravity, quizzes, and nine audio banks all landed in the same semester.

Marcello Gonzatto Birkan, Programming lead · Nebula Dream Interactive

Made to order - Bring the problem to the bench.

A rough idea is enough to start. You’ll talk directly with the person who will build it.

Bench

São Paulo