Role: Founder and sole developer, from product and design to both native apps and release.

Highlights

• Shipped native apps on both platforms: Swift and SwiftUI on iOS, Kotlin and Jetpack Compose on Android.
• Built a multi-source import pipeline that turns tracks from different platforms into one consistent library.
• Built CI/CD pipelines for different app variants: Debug, QA, Alpha and Release (Prod).
• Designed a custom dark design system (amber accent) applied across Library, Now Playing and Search.
• Growing an organic early user base with no paid promotion.

Design

• Designed the UI in Wonder: one “Mojo Player” file with an artboard per screen (Library, Album Detail, Artist Detail, Now Playing), in dark and light variants.
• Design tokens (colors, typography, shapes) were read straight from the artboards into a token layer in code, so screens never use raw hex values.
• Reusable Wonder pieces (tab bar, mini player, pills, media cards, track and album rows) became a shared component layer, and each screen is composed from it.
• Every screen and component is guarded by screenshot tests, so the build stays faithful to the design.

Backend

• Built the MOJO backend in Python with Flask, exposing a REST API consumed by both the iOS and Android apps.
• The API receives a track link, resolves it on the source platform and returns the audio and metadata for the app to store locally.
• Hosted on a self-managed Linux Mint server.

Tech

Swift, SwiftUI, SwiftData, AVFoundation, Kotlin, Jetpack Compose, Firebase (Auth, Analytics, Crashlytics), Kingfisher, Python, Flask

Role: Sole developer, from concept and sound design to both store releases.

Highlights

• Built the original app in Godot with GDScript and shipped it to the App Store and Google Play from one codebase.
• Integrated the Freesound API: text search plus a “word + number” syntax that finds sounds around a given BPM (for example “Techno 120”).
• Every search result becomes a draggable sound object with its own audio bus, so each sound gets independent volume, pitch, looping and effects.
• Covered the core (effects, sound objects, API, input) with unit tests using the GUT framework, run on GitHub Actions.

Native Android rewrite

• Rebuilt the app in Kotlin and Jetpack Compose to get true multi-touch: every bubble handles its own pointer events, so several sounds can be dragged at once with different fingers, which Godot’s input model did not allow cleanly.
• Wrote the audio effects by hand as Media3 audio processors: reverb (Freeverb, with room, hall and plate presets), delay (slapback, ping-pong, tape), chorus, phaser, flanger, distortion, filter, compressor, bitcrush glitch and stutter/repeat.
• Designed a custom rotary knob control and a color-coded effects panel in a bottom sheet.
• Added recording of the full mix with Android’s playback capture, saved as WAV and ready to share.
• Multi-touch dragging is covered by instrumented UI tests.

Tech

Godot, GDScript, GUT, Freesound API, Kotlin, Jetpack Compose, MVVM, Media3 ExoPlayer, Retrofit, OkHttp, GitHub Actions

Role: Sole developer: game design, programming and music.

Highlights

• Four levels, each with its own environment and challenges.
• Light and dark variants of the weapons, which adapt to the level.
• Boss battle with an animated boss and multiple attack phases.
• Collectibles: coins, health potions and speed potions.
• Soundtrack mixing the original MSX music with my own remixes.
• Keyboard and gamepad support.

Tech

Godot 4, GDScript, custom shaders, signal-driven architecture, 2D physics layers

Role: Sole developer of the iOS and Android apps. UX, UI and illustrations by my sister.

Highlights

• Built the original iOS app with UIKit: custom components, stack views, direct manipulation of view layers and a stack data structure behind the editor.
• Meme editor based on multi-touch gestures: move, pinch to scale and rotate stickers and text, with layer ordering.
• Backed by Firebase: Database, Auth, Messaging, Storage, Analytics and Crashlytics.
• Started a 2025 rewrite of the iOS app in SwiftUI, moving local storage to SwiftData and adding Google sign-in.

Android

• Android version with its own touch system for gesture-based editing of stickers and text.
• Migrated the codebase from Java to Kotlin, moved the camera to CameraX and added Android 15 support (16 KB page size).
• Stickers are served from Firestore with a local offline fallback and image caching.

Backend

• Wrote a Firebase Function in Python that checks uploaded images with an NSFW filter before they are shared.

Tech

Swift, UIKit, SwiftUI, SwiftData, Kingfisher, SDWebImage, Kotlin, CameraX, Firebase (Auth, Firestore, Storage, Messaging, Functions, Crashlytics), Python

Role: iOS developer, responsible for UI components and screens.

Highlights

• Part of the team that created the app from scratch.
• Built the UI components: custom alerts, virtual keyboard, buttons, styles and menu.
• Built screens for billing, transfers, chat, payments and favorite shortcuts.

Tech

Objective-C

Role: Sole developer of the iOS, Android and web versions.

Highlights

• Built the native iOS app in Swift with MVVM and the Coordinator pattern, using protocols for dependency injection and testability.
• Recipes live in Firebase Firestore with offline persistence, so the app keeps working without a connection.
• Text-to-speech narration of recipes with a choice of Brazilian or European Portuguese voice.
• Pinterest-style photo grid, parallax header on the recipe screen, and recipe sharing.
• Refreshed the app in 2025 (version 1.1): safer concurrency around Firestore setup, fewer third-party dependencies, updated unit tests.

Android and web

• Built the Android version in React Native with TypeScript: paginated recipe list, masonry grid, debounced search over title and ingredients, light and dark mode, Jest tests.
• Built a Progressive Web App in React: masonry grid with infinite scroll, offline support through a Workbox service worker, automatic dark mode, hosted on Firebase.

Tech

Swift, UIKit, MVVM, Coordinator, AVFoundation, Kingfisher, Firebase (Firestore, Storage), React Native, TypeScript, React, Workbox, Jest

Role: iOS developer on the prototype team.

Highlights

• Built a detailed prototype with the main features and screens: invoice, investment charts, card billing, chat, payment log and shortcuts.
• Interviewed users with the prototype in hand, collecting instant feedback on what they liked, disliked and wanted improved for the next version.

Tech

Objective-C

Role: iOS developer in a small team that built the app from scratch.

Highlights

• Augmented Reality furniture and décor placement built on ARKit.
• Universal app, supporting both iPhone and iPad.
• Structured with the VIPER architecture.
• Worked with CI/CD, code reviews and unit testing as part of the team workflow.

Tech

ARKit, VIPER, ReplayKit, CoreData, CI/CD, unit testing

Role: Sole developer.

Highlights

• Single-page React app with no backend: it runs entirely in the browser and is deployed as a static site on GitHub Pages.
• Photos auto-advance every 10 seconds and are centered on screen whatever their orientation, portrait or landscape.
• Started with Unsplash as the photo source, then moved to the Google Photos Picker so people can use their own photos.
• Picked photos are downloaded once and cached in IndexedDB, so the screensaver keeps working after a reload without signing in or picking again.
• Google sign-in is handled with Google Identity Services and silent token renewal, with no server-side secret.

Tech

React, JavaScript, Google Photos Picker API, Google Identity Services, IndexedDB, GitHub Pages