Sociko

Stack

Impact

• Front-desk check-in answers on the spot whether a member is current — and every lapsed member who walks in gets flagged on the collections list with their phone number, which is where the gym recovers unpaid monthly fees.
• Annual plan with two months free, with the member receipt and the renewal notice sent by email — the gym stops chasing renewals by memory.
• Membership status is always derived from the expiry date, never stored: no cron job flipping flags, no data lying at midnight.
• Optional online billing via Stripe Connect direct charges: payments land in the gym's own Stripe account under the gym's name — the platform never touches the funds.
• Offline-first PWA: the member roster stays readable at the front desk even when the internet drops.

What I did

• Fully civil date model (YYYY-MM-DD strings) with a lint rule banning `new Date()` outside a single helper — in an expirations business, one timezone slip turns away a paying member at the door.
• Monthly renewals anchored to the original date with end-of-month clamping, verified by mutation testing: 12 on-time renewals add up to exactly one calendar year.
• Atomic renew-and-charge transactions keyed by idempotency: a double tap on 'Renew' cannot duplicate the income record or the membership.
• Full technical SEO: public routes prerendered to real HTML at build time, per-page metas, JSON-LD and sitemap.
• The collections list hands over a WhatsApp message already written for each lapsed member, so recovering one is a tap instead of a task.
• A daily sweep enforces the 90-day clause in the Terms: it warns twice before closing an inactive account, so the promise in the legal text is code and not a paragraph.

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