Executive Summary

Adding live text interactivity (Q&A, Moderation, and Polling) to a live video broadcast is a highly complex engineering undertaking. While the video stream itself acts as a one-way broadcast, real-time interactivity requires a bidirectional, stateful data engine capable of handling tens of thousands of simultaneous read/write requests with zero latency.

Because we must engineer custom routing (to ensure investors interact with the correct concurrent presentation) and custom moderation logic (to screen questions before they go public), this cannot be achieved with a simple "plug-in." It requires a dedicated real-time database architecture.

Below are the two viable architectural paths for this build, detailing the trade-offs between upfront development time and long-term monthly infrastructure costs.

Option A: The Cloudflare Native "Edge" Architecture (Recommended)

This approach runs the entire live chat and polling engine on Cloudflare Durable Objects and WebSockets.

Instead of routing data through a third-party database, we spin up a temporary, dedicated "mini-server" on Cloudflare's edge network for every single presentation. Thousands of investors connect directly to this object, interact, and when the presentation ends, the object is destroyed.

• Upfront Development: High (6 to 8 Weeks). Cloudflare provides raw infrastructure. Our engineering team must build the WebSocket reconnection logic, ping/pong heartbeats, presence tracking, and data broadcasting loops from scratch.
• Monthly Infrastructure Cost: Extremely Low (~$10 - $20/month). Cloudflare does not charge for WebSocket bandwidth. You only pay for the fraction of a cent it costs to run the temporary server during the 45-minute presentation.
• The Strategic Advantage: Vendor consolidation. Your video streaming and interactive chat run on the exact same zero-latency network, completely eliminating variable "data egress" bandwidth fees.

Option B: The Firebase Realtime Architecture

This approach integrates Google Firebase as the real-time data layer. Firebase is the industry standard for rapid chat development and provides pre-built SDKs that automatically handle user connections, offline caching, and broadcasting.

• Upfront Development: Medium (4 to 6 Weeks). Because Firebase provides out-of-the-box SDKs for connection management, our team saves roughly 1 to 2 weeks of raw WebSocket engineering. We only need to build the UI and moderation rules.
• Monthly Infrastructure Cost: High & Variable (~$500 - $2,000+/month at scale). Firebase charges primarily by bandwidth downloaded. If 5,000 investors are connected to a presentation, every single new question or poll vote sends a data packet to all 5,000 devices simultaneously. This scales linearly; the more popular your platform gets, the more expensive your monthly Firebase bill becomes.
• The Strategic Disadvantage: Introduces a new third-party vendor to your stack and exposes the platform to volatile monthly data transfer costs during peak usage.