Groundkar — Sports Turf Booking & Facility SaaS
Real-Time Slot Concurrency, Multi-Venue Scheduling & Automated Payout Architecture
A high-concurrency sports facility management platform engineered to resolve double-booking conflicts, automate hourly turf reservations, and handle automated split payouts across dozens of venue owners.
Project Overview
The Product & The Vision
Groundkar is a specialized sports facility booking platform built for managing recreational turf reservations, hourly court rentals, and multi-venue availability. The partner agency provided the product vision and high-fidelity Figma UI/UX, while wswebsolution was contracted to architect and build the complete full-stack web application, real-time locking engine, and administrative booking management dashboard.
Agency Partnership Context
Why wswebsolution Was Engaged
A boutique digital agency secured the product build contract for an ambitious sports-tech venture. The agency had strong creative and product design capabilities but required an external engineering partner to design the complex transactional database schema, prevent race condition booking overlaps, and implement automated payment settlement workflows under their agency brand.
Challenge vs. Architectural Solution
How our systems architects broke down complex project barriers into modular engineering wins.
- Preventing simultaneous race conditions where multiple users attempt to reserve the exact same sports turf slot in the same second.
- Supporting dynamic pricing matrices based on peak hours, weekend rates, and custom venue lighting charges.
- Ensuring venue managers with basic digital literacy can adjust schedule overrides and view earnings with zero technical friction.
- Delivering the entire application with complete white-label confidentiality and zero wswebsolution attribution.
- Engineered an atomic distributed lock system using Redis and PostgreSQL row-level locks, reserving slots for a 10-minute checkout window before releasing if abandoned.
- Designed a flexible rules-based pricing engine capable of applying tiered hourly rates, seasonal adjustments, and bundled equipment rentals.
- Constructed a responsive, mobile-first venue manager control panel with calendar drag-and-drop rescheduling and instant WhatsApp booking confirmation triggers.
- Deployed automated CI/CD pipelines under the agency's private repository with automated unit tests for all booking and payment edge cases.
System Architecture Highlights
Concrete architectural decisions made to guarantee scale, data safety, and performance.
Distributed Slot Locking Mechanism
When a customer selects an open hour, an atomic Redis lock is acquired with a 600-second TTL. This immediately marks the slot as 'pending' across all connected clients via server-sent events, completely eliminating double-booking hazards.
Multi-Tenant Venue Isolation
Each venue partner operates within a tenant-scoped query structure, ensuring venue managers can only access their specific facility bookings, cash collection logs, and customer contacts.
Automated Rescheduling & Cancellation Rules
Integrated business logic enforcing custom cancellation windows (e.g., full refund >24h, 50% credit >12h, no refund <12h) executed directly via database transactions.
Technologies & Frameworks Deployed
The specialized tech stack chosen to meet the project's performance and security requirements.
Server-side rendered booking flows, dynamic calendar components, and administrative portal.
Transactional booking microservice and webhook event handlers.
Primary relational database utilizing ACID transactions and row-level locking for reservation safety.
Distributed key-value store for high-throughput temporary slot holds and concurrency management.
Type-safe database modeling, migration versioning, and query optimization.
Responsive, mobile-optimized component styling matching agency Figma design tokens.
Payment intent capture, automatic refund triggers on cancellation, and venue payout calculations.
Scope Delivery
Key Modules Delivered
Sprint Execution
Development Process & Milestones
Database schema design, relational modeling in PostgreSQL, Redis lock proof-of-concept, and CI/CD repository setup under agency GitHub.
Implementation of slot availability matrices, pricing rules, payment gateway integration, and webhook idempotency.
Interactive full-calendar UI, walk-in reservation overrides, financial reporting views, and role-based permissions.
Automated simulation of 500 concurrent users contesting the same booking slot to verify zero race conditions.
Client walkthrough on agency staging environment, documentation handoff, and production deployment on managed cloud infrastructure.
Technical Deliverables & Code Handoff
Verified artifacts signed over unconditionally to the partner agency upon completion.
Ready to Deliver Serious Engineering for Your Clients?
Bring your architectural requirements or RFPs to wswebsolution. We will provide a complete sprint breakdown and fixed estimate under mutual NDA.