Chemistry.IRL Matchmaker

A production-grade social dating platform backend and universal mobile client. The backend features a strict three-layer architecture (routes → services → repositories) handling 132 endpoints across 36 core services.

Migrating business logic from a legacy React admin dashboard without causing regressions or duplicating complex matchmaking queries. I isolated all Drizzle queries into dedicated repositories, creating a clean service API layer utilized by both Admin portals and the mobile app.

// Fastify 5 + TypeScript 3-layer architecture repository query
export class MatchmakingRepository {
  private readonly db: PgDatabase;

  async findMutualMatches(userId: string, limit: number): Promise<Match[]> {
    return this.db
      .select()
      .from(matchesTable)
      .where(
        and(
          eq(matchesTable.status, 'mutual'),
          or(eq(matchesTable.userOneId, userId), eq(matchesTable.userTwoId, userId))
        )
      )
      .limit(limit)
      .execute();
  }
}