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Borderline

Consumer product at scale · Design, build & operations

A consumer web product with a real, growing audience: over 220,000 games played by more than 23,000 registered users, adding roughly 3,000 new users every month. Players are shown a country outline on an interactive globe and have to name it. Everything behind that — the map engine, the accounts, the scoring, the leaderboards, the growth analytics and the infrastructure — was designed, built and is operated in-house.

borderlinequiz.com →

220,000+

Games played

23,000+

Registered users

~3,000

New users a month

249

Countries, observer states and territories, at full geometric fidelity

Highlights

Large, active community. 220,000+ games played, 23,000+ registered users and roughly 3,000 new users a month, with a returning-player cohort every week.
Complete global coverage — 195 UN member states, 2 observer states and 52 territories and dependencies.
Progressive difficulty that works by removing context rather than by adding trivia, keeping the product interesting for players who stay.
Social media virality. Up to 1M views on a single TikTok, 79k views on Reddit and 2.7k views on YouTube.
Instrumented for growth. A first-party analytics dashboard reports new versus returning users, hourly activity, abandonment and difficulty mix, so product decisions are made against measured behaviour.
Retention designed into the mechanics. A weekly leaderboard that counts only a player's first 20 games, daily play limits and playing streaks — rewarding regular return visits over volume.

Technical detail

React 19 mobile-first UITypeScriptViteD3-geoNetlify FunctionsDrizzle ORMNeon PostgresEleventyVitest

Original gameplay. Fully built using spec-driven agentic AI development.
Custom map engine. D3-geo orthographic projection with hand-built zoom and drag, rendering an interactive globe directly from geometry with no map-tile provider or mapping SDK.
Level-of-detail geometry swapping — coastline resolution is exchanged as the player zooms, keeping tiny island nations recognisable without stalling the frame.
Serverless data layer — Netlify Functions over Neon serverless Postgres, with every schema change a reviewed Drizzle migration — schema pushes against a live database are prohibited outright.
Backend test suite on Vitest and in-memory PGLite, covering positive and negative API paths, gating every merge alongside a full type check and build.

Borderline

Highlights

Technical detail

Kaddi

ADC Ready