Event and ticketing platforms combine the complexity of e commerce with the urgency of real time inventory management. When 5,000 people try to buy 500 tickets at the same moment, your system either handles the concurrency correctly or it oversells and creates a customer service nightmare. We have built ticketing systems that handle high demand on sale events, and the technical decisions around inventory locking, payment flow, and queue management are what separate platforms that work from platforms that crash under pressure.
Why Build a Custom Ticketing Platform
Eventbrite, Ticketmaster, and Universe handle general purpose ticketing. But they take 3 to 8 percent of every transaction, they control the customer relationship, and they offer limited customization. Organizations that run events as a core part of their business, such as venue operators, festival organizers, conference companies, and performing arts centers, reach a point where the platform fees alone justify custom development.
The math is simple. A venue doing $2 million in annual ticket sales at a 5% platform fee is paying $100,000 per year. A custom platform eliminates that ongoing cost and gives you full control over branding, customer data, and the purchase experience.
Beyond cost, custom platforms enable features that off the shelf tools do not support well: dynamic pricing that adjusts based on demand, subscription and membership models, bundled packages (ticket plus hotel plus parking), white label solutions for multiple venues, and deep integration with your existing CRM and marketing tools.
Core Architecture
A ticketing platform has five critical subsystems:
1. Event and Inventory Management. This is the admin interface where organizers create events, define ticket types, set pricing, configure venue maps, and manage availability. For seated venues, this includes a visual seat map editor where you can define sections, rows, seats, and pricing tiers.
2. Storefront. The customer facing purchase flow where buyers browse events, select tickets, choose seats (for reserved seating), and complete checkout. This needs to be fast, mobile optimized, and handle high concurrent traffic during popular on sales.
3. Payment Processing. Secure checkout with credit cards, digital wallets, and potentially buy now pay later options. The payment flow must coordinate with inventory to prevent overselling.
4. Ticket Delivery and Validation. Generating digital tickets with QR codes, delivering them via email and mobile wallet, and validating them at the door with scanning hardware or a mobile app.
5. Post Event Analytics. Sales reports, attendance data, revenue breakdowns, and marketing attribution to help organizers understand performance and plan future events.
The Concurrency Problem
This is the hardest technical challenge in ticketing. When an event goes on sale and demand exceeds supply, you have a thundering herd problem. Hundreds or thousands of requests arrive simultaneously, all trying to claim from the same finite inventory.
The wrong approach: Check available quantity, process payment, decrement quantity. This creates race conditions where two buyers both see 1 ticket remaining, both start checkout, and both complete payment for the same ticket.
The right approach: Use database level locking with a reservation pattern.
1. Buyer selects tickets. The system creates a reservation that temporarily locks those specific tickets (or that quantity for general admission) for a time window, typically 8 to 12 minutes.
2. During the reservation window, those tickets are removed from available inventory. Other buyers see the reduced count.
3. If the buyer completes payment, the reservation converts to a confirmed order.
4. If the reservation expires without payment, the tickets return to available inventory automatically.
In PostgreSQL, we implement this with `SELECT ... FOR UPDATE SKIP LOCKED` on the ticket inventory rows. This provides row level locking without blocking other transactions that are trying to lock different rows. Combined with a background worker that expires stale reservations every 30 seconds, this pattern handles thousands of concurrent buyers without overselling.
Seat Selection Interface
For reserved seating events, the seat map is one of the most complex UI components you will build. It needs to render thousands of seat elements with color coded availability, support zoom and pan on desktop and mobile, update in real time as other buyers select seats, and remain accessible via keyboard navigation.
We build seat maps using SVG for rendering with a React component handling interaction state. Real time updates come through WebSocket connections that broadcast seat status changes to all connected clients within 1 to 2 seconds. The admin side needs a seat map editor where venue managers define sections, rows, seats, and pricing tiers, typically a 3 to 4 week development effort on its own.
Payment Flow
The ticketing payment flow has unique requirements compared to standard e commerce:
Speed matters. During high demand on sales, every second of checkout friction costs conversions. We minimize form fields, support saved payment methods for returning customers, and integrate Apple Pay and Google Pay for one tap mobile checkout.
Stripe is our recommended payment processor for ticketing. Use Payment Intents for the transaction flow. Create the Payment Intent when the reservation starts with the calculated total, confirm it when the buyer submits payment, and handle the webhook for successful payment to convert the reservation to a confirmed order.
Fees and pricing. You need to decide whether to absorb processing fees, pass them to the buyer, or split them. Most ticketing platforms add a "service fee" to the ticket price. The system should calculate and display this transparently during checkout, showing the base ticket price, service fee, applicable taxes, and total.
Refund policy. Build configurable refund rules per event. Some events allow full refunds up to 48 hours before. Some allow exchanges but not refunds. Some are final sale. The refund workflow should reverse the payment through Stripe automatically and return the tickets to available inventory.
Ticket Delivery
Each ticket gets a unique identifier encoded as a QR code containing a signed JWT token (order ID, ticket ID, event ID) that cannot be forged. After purchase, email tickets as a PDF and include Apple Wallet and Google Wallet passes. For venue entry, build a scanning app that validates QR codes against the database, checks for duplicate scans, and shows a green or red confirmation. This needs to work with poor venue connectivity, so we implement local caching of the ticket database with periodic sync.
Marketing, Promotion, and Analytics
Ticketing platforms are also marketing platforms. Build discount codes (percentage off, fixed amount, BOGO, early bird) with usage limits and date ranges. Add affiliate tracking with unique links for promoters so you can calculate commissions. Implement waitlists that automatically notify buyers when tickets become available through cancellations. And build abandoned cart recovery that emails buyers who started checkout but did not complete it.
On the analytics side, organizers need sales velocity charts, revenue breakdowns by ticket type and promo code, geographic buyer data, and check in rates comparing tickets sold versus scanned. We build dashboards with real time data so organizers can watch sales during a marketing push and see results immediately.
Technical Stack
For the full stack development of a ticketing platform, we recommend:
- Next.js for both the storefront and admin dashboard
- PostgreSQL with row level locking for inventory management
- Redis for session management, reservation timers, and rate limiting during high traffic on sales
- Stripe for payment processing with Connect if you are a platform serving multiple organizers
- WebSockets (via Supabase Realtime or a dedicated service) for live seat map updates and sales dashboards
- React Native for the door scanning app if you need native camera access for QR code reading
The system architecture needs to handle traffic spikes. A typical event sees 80% of its sales in the first hour of an on sale. Your infrastructure needs to scale for that peak, not the average. We use edge caching for static event pages and rate limiting with queuing for the checkout API to prevent system overload.
What It Costs
A production ticketing platform with event management, storefront, payment processing, digital tickets with QR scanning, and basic analytics takes 4 to 6 months with a team of 3 to 4 engineers. Adding reserved seating with a visual seat map editor adds 4 to 6 weeks. For context on overall budgeting, see our guide on how much custom software development costs.
Choosing between building custom versus using a SaaS platform comes down to transaction volume and how central events are to your business. If you run fewer than 20 events per year, use Eventbrite. If events are your business and you are processing over $500,000 in annual ticket sales, the platform fees you save will fund the custom build.
If you are ready to own your ticketing experience and stop paying per ticket fees, reach out to start the conversation.