Visa Slot System

I am building a service that continuously checks a visa-appointment portal and confirms slots the instant they open. The job is to architect and code the entire automation workflow—from session management and scheduling logic to resilient, cloud-hosted execution—so it can run 24/7 without being detected or throttled.

You must already operate at an expert level with large-scale automation; theoretical knowledge is not enough. Anti-bot security is my top concern, so your portfolio should include live, bypass-resistant systems that still function today under heavy scrutiny. Direct, verifiable references or screen-share walk-throughs of those projects will be required before we proceed.

The project hinges on Cloudflare Turnstile integration. Whether you solve it through token generation, browserless challenges, or a hybrid farm of headless browsers is up to you, but the final design must slot seamlessly into the rest of the pipeline and survive future Turnstile updates.

Core expectations
• Highly concurrent backend (Python, Node, Go, or comparable) able to scale horizontally without single-point failures
• Smart queueing and retry logic so no slot is wasted while avoiding brute-force patterns
• Clean, well-documented code, containerised for simple deployment (Docker/Kubernetes preferred)
• Real-time metrics and alerting to verify success rates and spot blocks early

Acceptance criteria
1. System books at least 95 % of available slots in a controlled test window.
2. Turnstile challenge handling remains stable over 72 h of nonstop traffic.
3. Zero critical errors under a simulated peak of 10 000 concurrent requests.

If you can demonstrate proven, production-ready experience that matches the above, let’s talk.