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    Notification Platform

    A unified notification service: preferences, templates, fan-out, and delivery receipts. Redis lists/streams take the burst; workers talk to SendGrid, FCM, and Twilio; Postgres stores what was sent and why. Users get one preference centre instead of five overlapping crons.

    5K – 500Kusers supported
    $100 – $1,500/month infrastructure

    Architecture Diagram

    Interactive — hover over any node to see its role and description.

    Product APINotify APIRedis QueuesPriorityEmail WorkerPush WorkerSMS WorkerPostgreSQLPrefs + logIn-app inboxAPICacheQueueDatabaseFrontend

    Use Cases

    SaaS product notifications (in-app + email)
    E-commerce shipping and back-in-stock alerts
    OTP and security alerts with higher priority queues
    Marketing campaigns with suppression lists
    Digest collapsing so users are not spammed

    Technology Stack

    frontend

    React preference centre

    backend

    Node.jsBullMQ

    database

    PostgreSQLRedis

    infrastructure

    ECSElastiCache

    integrations

    SendGridFCM / APNsTwilio

    Scalability Roadmap

    Stage 10 – 10K users· One Redis + workers

    BullMQ on one Redis. Fine for transactional mail.

    Stage 210K – 100K users· Priority queues

    Split OTP vs marketing. Dedicated SendGrid IPs.

    Stage 3100K – 500K users· Redis Cluster + shards

    Shard by user id. Horizontal workers. Bounce webhooks at scale.

    Stage 4500K+ users· Regional send

    Workers near the ESP region. Preference DB replicated. Quiet hours in local TZ.

    Cost Breakdown

    Development Cost

    $8,000 – $20,000 (5–10 weeks)

    Infrastructure Cost

    $100 – $1,500/month plus per-message vendor fees

    Maintenance Cost

    $1,000 – $3,000/month for deliverability and template ops

    Security Considerations

    Unsubscribe and preference changes are authenticated
    OTP templates cannot be used for marketing sends
    PII in templates minimised; logs retained on a schedule
    Provider webhooks signature-verified

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