Selected work

Things I built and led

Three case studies show how I work from an early idea through product decisions, team formation, launch, and evaluation.

Original concept · First prototype · Game direction

Sky Warriors

I originated the idea, built the first playable during a Wildlife hackathon, and directed it from a five-person prototype team through global launch.

0→1 idea to global launch 5→30+ team growth 2021 global launch

My role: Originator, first-prototype builder, and Game Director. I owned the product vision, business case, roadmap, launch targets, and P&L.
The problem: Turn a hackathon prototype rooted in my love of air-combat games into a distinct, accessible mobile PvP experience and prove it could scale.
What I did: I built the first playable, turned it into a product thesis, assembled the multidisciplinary team, and led the controls, product, game design, and business decisions through launch.
Result: The game launched globally in 2021 with a team of more than 30. In 2022, it won W3 Gold for visual design and Silver for game features and user experience.
Artifact: View the game → Read the making-of → W3 recognition →

A Tennis Clash rally on a red hard court, with the mobile match interface visible. — Official App Store gameplay

Wildlife Studios · Mobile game

Tennis Clash

I co-led product and game development through global launch and live operations.

#1 downloads in 78 countries 300K+ downloads per day 50+ cross-functional team

My role: Product and game co-lead. I owned product vision, P&L, UX, game design, balancing, and roadmap priorities.
The problem: Take a new competitive tennis game through launch and operate it as a global live product.
What I did: I worked across the physics, interface, game systems, economy, roadmap, and live product decisions with a 50+ person team.
Result: Tennis Clash reached No. 1 in downloads in 78 countries, ranked in the top ten in more than 100, and surpassed 300,000 downloads per day.
Artifact: View the game → Published results →

Independent · AI evaluation

Game Bench

A public benchmark for how frontier coding models build complete, playable browser games.

14 scored builds 9 blind tests 1 frozen prompt

My role: Creator and builder. I designed the benchmark, scoring model, run protocol, public site, and blind-playtest flow.
The problem: AI coding demos used different prompts, conditions, and amounts of human help, which made their outputs hard to compare.
What I did: I froze the brief and run conditions, made every result playable, and scored gameplay, adherence, engineering, and art. I added cost-aware rankings and anonymous playtests.
Result: The public benchmark now contains 18 scored builds. Nine games can be played blind before the model identities are revealed.
Artifact: Read the case study → Open the benchmark → Play blind → Read the rubric →

Interactive data tool · Open Era tennis

Tennis GOAT

Compare João Fonseca’s career take-off with 18 players at the same age, then set the weights behind your own GOAT ranking.

Compare the careers →

Playable

MapTap SP

A daily São Paulo geography game built around satellite maps, distance scoring, and shareable results.

View the product →

Local browser game

Magician Hop

A small canvas game about a magician defending one screen with fireballs. I built it as a fast personal prototype.

Android prototype

Auto Lyrics

An Android and Android Auto app that follows the active media session and shows time-synced lyrics without a Spotify login.

View the product →

Private tool · Faithful public edition

Personal CRM

A local-first relationship memory system with review queues and source-backed profile enrichment. Its data stays private.

Try the sanitized demo →

Private tool · Faithful public edition

Command Center

A dashboard for projects, AI agents, deployments, and system health. Its operational data stays private.

Try the sanitized demo →

Interactive explainer · White-label edition

Tree of Life Explorer

A navigable journey from modern humans through major evolutionary checkpoints to the shared ancestry of life.

Explore deep time →