Courts Booking MVP (multi-club, Stripe, Calendar) + AI Assistant — Full-Stack Dev or Small Team

Budget: 5000 USD Deadline: 70 days

I can build a robust MVP for multi-club sports court booking with secure slot management, anti-overbooking logic, Stripe payments (including partial refunds and 3DS), .ics/iCal export, Google Calendar sync, user/admin roles, and an in-app AI assistant with RAG-powered chat. I have experience implementing transactional booking systems, multi-tenant setups, AI function-calling workflows with guardrails, and full-stack development using React/Next.js, Node/NestJS, and Postgres, ensuring a scalable, secure, and maintainable solution.”

Budget: 16500 USD Deadline: 100 days

Hello!
My name is Alexey, I represent a group of developers – NC-1.
For over five years, we have been creating websites, mobile applications, online stores, ERP/CRM systems, and other e-commerce products.
Our team has specialists with the necessary experience and knowledge for you. We will select the optimal stack for you. For example:
Frontend - Next.js (recommended for MVP due to built-in SSR, API routes, and excellent deployment on Vercel) + TypeScript.
Backend: NestJS (perfect due to its modular architecture, built-in validation, TypeScript)
Hourly rate - 20 USD (depends on the developer's level)
Timelines and stages:
1. Architecture and infrastructure
Database design, API, repository setup, CI/CD
90 hours
2. Core system (slots and booking)
Schedules, slot search, competitive booking, tests
180 hours
3. Payment system (Stripe)
PaymentIntent, 3DS, webhooks, partial refunds
120 hours
4. Calendars and notifications
.ics generation, Google Calendar API, email notifications
80 hours
5. Admin panel
CRUD for schedules, prices, bookings, analytics
100 hours
6. AI assistant
Chat widget, function calls, RAG with pgvector, limitations
110 hours
7. Final integration and documentation
Hosting, testing, Swagger, project handover
20 hours
Total 700 hours - 100 days (if 1 developer works. We can involve several who will work in parallel)
Answers to your questions will be provided by the developer if you are interested in our offer.
Cases: https://1drv.ms/b/c/b7a0d31a9dae1bc5/EeH6JPdpBbpKtrkA1zFQOIMBAmqUcd_Ptx5tt5p9hBNG-g?e=wXDGHh
Portfolio – https://nc-one.com/case-studies Expand

Budget: 300 USD Deadline: 1 day

Hello.

The Mobiwolf team specializes in the development of booking systems, payment integrations (Stripe, 3DS, webhooks), calendar logic (.ics, Google Calendar), and AI assistants with functional calls (RAG, LangChain, OpenAI). We have practical experience in creating competitively secure transactional models with idempotency, which fully meets your specifications.

We offer a complete MVP development cycle: architecture, backend (FastAPI or NestJS), frontend (React/Next or Flutter), AI module, integrations, testing, and CI/CD.

Estimated duration — about 10 weeks, fixed or hourly format (from $35/hour). We are ready to discuss the exact estimate, stage structure, and stack after clarifying details about the number of clubs, types of venues, and slot filtering logic.

I would be happy to discuss technical nuances and the optimal approach in a private chat.

— Oleksiy, Mobiwolf Expand

Budget: 4500 USD Deadline: 60 days

Good afternoon, Arthur. I am ready to help you with the implementation of this sports facility booking service. I create projects in Flutter. Over 10 years of development for both native applications and cross-platform. I am ready to discuss the details.

Budget: 4500 USD Deadline: 60 days

Hello! 👋

I’m a Full-Stack Developer (React/Next.js + Node.js/NestJS + Postgres) with experience in booking systems, Stripe payments, calendar integrations, and AI assistants.
I can lead the MVP development or build it together with a small dev team.

✅ Relevant experience
* Booking & concurrency: implemented slot-based reservations with transactional locks & idempotency to prevent overbooking.
* Stripe integration: PaymentIntent, 3DS flow, cancel & partial refund, webhook-driven updates.
* Calendars: iCal export (.ics), Google Calendar & Outlook sync.
* AI assistants: integrated OpenAI & Claude for customer support with function calling tools and RAG over Postgres/pgvector
* Admin panels: dashboards for scheduling, pricing, promo codes, refunds & audit logs.
🏗 Proposed architecture
* Frontend: Next.js (React, SSR for SEO), Tailwind UI, chat widget.
* Backend: NestJS (Node.js) + REST API with Swagger/OpenAPI docs.
* DB: Postgres + pgvector for RAG; Redis for caching & rate limiting.
* Payments: Stripe w/ 3DS, webhooks for cancel & partial refund.
* Calendar: iCal (.ics) generation, basic Google Calendar sync.
* AI assistant: orchestrator w/ tools (searchSlots, createBooking, cancelBooking, getClubRules, sendIcsEmail) + RAG over club policies.
* Infra: Docker, CI/CD (GitHub Actions), deployed to Fly.io/Render or Railway (to agree).
* Security: API rate limits, secrets in vault, masked logs, no PII to LLM.

📋 Key milestones
* Setup: architecture, repo, CI/CD skeleton — 1 week
* Core booking: slots, anti-collision tests — 2 weeks
* Payments: Stripe 3DS, cancel & partial refund, webhooks — 1 week
*Calendar: .ics export, email, Google sync — 1 week
*Admin panel: schedules, pricing, bookings, refunds, audit — 2 weeks
*AI assistant: chat widget, function-calling tools, RAG, guardrails — 2 weeks
*Docs & handover: README, API docs, tests — 0.5 week

⏳ Total: ≈ 8–9 weeks (MVP)
💲 Rate: $35–45/h (or fixed price per milestone)
🕑 Timezone: Europe (overlapping 6–8 h with Chicago), daily updates & weekly demos.

📂 GitHub / Portfolio
Github: https://github.com/globalmap
Portfolio: https://globalmap.github.io/project-list/ Expand

Budget: 29 USD Deadline: 10 days

Hello! 👋
My name is Dmytro, I represent the Averix team. We specialize in the development of mobile and web applications from architecture to deployment and documentation.

Your project for booking sports facilities looks very clearly structured and technically thought out. I especially appreciate the focus on competitive booking, integration with Stripe, and the AI assistant. We can help create an MVP with reliable booking logic, a user-friendly UI, and a scalable architecture aimed at further project development.

We work in sprints with transparent updates, adhere to clean code, test coverage, and modern CI/CD. After aligning on the vision, we will propose a detailed development plan with stages and fixed deliverables.

I would be happy to show our portfolio and client feedback in private messages.
I look forward to discussing the technical details, stack, and approach to anti-booking to propose the optimal implementation option for the MVP.

Budget: 3500 USD Deadline: 60 days

Good day! 👋

I have reviewed your technical assignment — it is very clear and interesting. I have experience in implementing similar solutions: booking systems with idempotent slots, Stripe integration (3DS, partial refunds), .ics export, and synchronization with Google Calendar, as well as embedded AI chats based on RAG and functional calls.

You can view examples in my portfolio Freelancehunt

Budget: 3000 USD Deadline: 30 days

Good afternoon!
I have extensive experience in developing various applications.
I will be able to give you an exact timeframe and cost after discussing all the details.

Budget: 4500 USD Deadline: 1 day

Hello,

Thank you for the detailed description, I will be happy to help with the implementation of the project. I am a Software Development Engineer with over 7 years of experience in creating various websites, SaaS solutions, complex web platforms, and MVPs for startups. In my portfolio, I have highlighted some of the projects I have developed.

My stack includes the following technologies and their frameworks: PHP (Yii2, Laravel, Symfony), HTML5, CSS3, JS (Vue.js, React.js), MySQL, PostgreSQL.

Budget: 25 USD Deadline: 1 day

Hello.
I am interested in your project. I am confident that I can deliver effective and high-quality work that meets your requirements and expectations. I have over 8 years of experience. I am ready to discuss the details and start working. I look forward to your response.

Budget: 6500 USD Deadline: 60 days

Hi there!

I can build the MVP for your booking system with clean slot logic that prevents double bookings by using short-lived hold tickets and idempotent keys inside transactions. Clubs will have clear schedules with holidays and exceptions, and each tenant is separated by ID so data never mixes.

I’d use React/Next for the web, FastAPI + Postgres (with pgvector) for the backend, and Stripe PaymentIntent with 3DS, webhooks, and partial refunds. iCal export and Google sync will be built-in. The AI chat runs with safe function calls only (search, book, cancel, rules, send email), with RAG over club FAQs, and guardrails so no payment data ever touches the model.

You can see my approach in projects like https://greetpool.com and https://storyai.cc.
I can work in your timezone, with weekly demos and daily updates.

Thank you!