Built for Scale: Festival On-Sales

The scary minute is not the social post announcing an on-sale — it is the sixty seconds after, when every fan refreshes at once. 4 Circles biases toward boring, battle-tested pieces: rock-solid MySQL inventory, disciplined queue workers, and elastic capacity on established cloud infrastructure so your team spends rehearsal time on creative cues, not apology tweets.

What is production-tested today

• Accurate inventory — every cart, hold, and purchase decrements the same counters, so "sold out" actually means sold out.
• Reservation hygiene — background jobs release stale holds so availability counters stay honest during frenzied refreshes.
• Idempotent checkout — payments survive double-taps and flaky LTE without double-charging fans.
• Per-organizer payouts — multi-seller carts settle correctly even when one basket spans three promoters.

How to operate hot shows confidently

Keep workers running on sale mornings, schedule the release-expired sweeps you already trust in rehearsal, and validate peak capacity with your own load drills — real numbers beat adjectives in marketing decks.

On the roadmap

• Waiting rooms for the hottest drops — order arrivals without melting under load.
• Edge shields — protect your origin from bot storms and click-frenzied refreshes.
• Multi-region resilience — geo-routed checkout for global on-sales.

For the engineering story behind the scenes, read how we think about festival on-sales and pair it with our security posture. Talk to engineering if you have a marquee on-sale coming up.