Pulse

Product Introduction

1. Definition: Pulse is an open-source, self-hostable polling application built for real-time audience engagement. Technically categorized as a serverless web application, it leverages AWS Lambda for compute and DynamoDB for data storage.
2. Core Value Proposition: Pulse solves the fragmentation and privacy limitations of existing polling tools by providing a standalone, lightweight alternative to Slack/Teams polls and Google Forms. Its core mission is to deliver anonymous, real-time voting without vendor lock-in or complex dependencies.

Main Features

1. Real-Time WebSocket Synchronization:
   Votes update instantly across all connected devices via WebSocket protocols. When a user submits a vote, the backend broadcasts updates through persistent connections, eliminating manual page refreshes. Built using AWS API Gateway WebSockets and Lambda functions.

2. Server-Enforced Privacy Architecture:
   Guarantees anonymity by design—no user identifiers (email/IP) are stored. Votes and poll metadata are cryptographically hashed server-side using DynamoDB streams. Creators can launch polls without authentication, and voter identities are irreversibly detached from responses.

3. AWS CDK Self-Hosting:
   Deploys to your AWS account via a single CLI command (cdk deploy). Infrastructure-as-code provisions Lambda, DynamoDB, S3 (frontend), and CloudFront using TypeScript CDK constructs. Runs entirely within AWS Free Tier limits for low-volume use cases.

4. Ultra-Lightweight Frontend (Sub-50KB):
   Vanilla JavaScript/CSS frontend with zero frameworks (React/Vue/Svelte) minimizes load times. Assets are optimized to 45KB, served via CloudFront CDN. Critical CSS inlined; no third-party tracking scripts.

5. Cost-Optimized Serverless Backend:
   DynamoDB on-demand pricing + Lambda pay-per-execution model ensures sub-$1/month costs for moderate usage. Scales automatically during traffic spikes without infrastructure management.

Problems Solved

1. Pain Point: Eliminates fragmented polling workflows buried in Slack/Teams (requiring logins) or Google Forms (lacking real-time updates). Solves paywall restrictions in tools like SurveyMonkey.
2. Target Audience:
   • Technical teams needing quick internal decision-making (engineering leads, product managers)
   • Educators running anonymous class surveys
   • Community moderators hosting public votes
   • Privacy-conscious organizations avoiding SaaS data residency risks
3. Use Cases:
   • Sprint planning vote-ups (e.g., "Which feature should we prioritize?")
   • Anonymous team retrospectives
   • Event scheduling ("When should we host the meetup?")
   • Live audience Q&A ranking during webinars

Unique Advantages

1. Differentiation: Unlike Slack polls (limited customization) or Typeform (costly at scale), Pulse combines real-time interactivity with self-hosting. Outperforms Google Forms in speed and anonymity while avoiding vendor dependency.
2. Key Innovation: Serverless-first architecture reduces operational overhead by 90% compared to container/polling-based alternatives. WebSocket integration with DynamoDB Streams enables sub-500ms sync latency at scale.

Frequently Asked Questions (FAQ)

1. How does Pulse ensure voter anonymity?
   Votes are dissociated from user identifiers at the API layer—only aggregated counts persist in DynamoDB. No cookies or client-side storage is used.
2. Can Pulse handle high-traffic voting events?
   Yes, AWS Lambda auto-scales to 3,000 concurrent executions, supporting ~10,000 votes/minute. DynamoDB handles 10,000+ requests/second in on-demand mode.
3. What AWS permissions does Pulse require for deployment?
   CDK deployment needs IAM rights for Lambda, DynamoDB, CloudFront, and S3. No elevated permissions (e.g., VPC/EC2) are necessary.
4. Is there a limit to poll options or duration?
   Technically, polls support unlimited options via DynamoDB’s 400KB item limit. Polls expire after 30 days by default (configurable in CDK).
5. How does Pulse compare to open-source alternatives like Straw Poll?
   Pulse adds real-time updates via WebSockets (vs. page refreshes), AWS self-hosting, and enforced server-side anonymity—unlike client-side alternatives vulnerable to user-agent tracking.