Vouchgether Live

A voucher-sharing community service in Ireland: WhatsApp bot + web portal + AWS serverless backend with Stripe subscriptions.

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Last updated: Feb 26, 2026

Tech

WhatsApp Business APIAWS LambdaAPI GatewayDynamoDBS3 (private objects + presigned URLs)CloudFrontStripe subscriptions + webhooksNode.js

Highlights

End-to-end product: WhatsApp bot + web pages (upload/claim/buy) + serverless backend.
Anti-abuse & fairness: duplicate prevention (image + serial), weekly limits, idempotent Stripe/WhatsApp webhooks.
Security-first delivery: vouchers stored privately in S3 and downloaded via short-lived presigned URLs.
Operational readiness: monitoring/alerts, runbooks, and a P0/P1 launch test plan.

Metrics / Notes

Designed a Go/No-Go checklist with P0 coverage for upload/claim/request/fulfill + payments + race-condition safety.
Built for real users in Ireland (community-oriented cost-saving product).

What it is

Vouchgether helps people share and claim discount vouchers in a community-friendly way. Instead of letting vouchers expire unused, contributors can upload vouchers and others can claim them—while the system enforces fairness rules, anti-cheat, and secure delivery.

Core flows (high level)

Upload voucher → OCR validation → duplicate check → voucher enters the pool
Browse vouchers → claim one → secure claim link
Claim page generates a short-lived download URL (S3 presigned URL)
Request / Fulfill flow so people can request specific voucher types
Subscriptions via Stripe (feature gating + reliable webhook handling)

Architecture snapshot

Event-driven + serverless, optimized for operational simplicity:

WhatsApp Bot for conversational UX
Static web (CloudFront) for upload/claim/buy pages
API Gateway + Lambda for business logic
DynamoDB for voucher/user/request/pledge data
S3 private storage for voucher images
Stripe checkout + webhooks for subscription state

Demo

Live site: lkk.dev
On this portfolio: see the UX walkthrough & screenshots in the Lab section.