Developer Builds Real-Time Spending Guard Using Flask, MongoDB Atlas, and Failover Architecture

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A developer has built Spendwise, a personal finance application designed to evaluate transactions in real-time rather than passively logging past expenses like conventional budgeting apps. The system uses a Python-Flask backend, MongoDB Atlas cloud database, and an in-memory RAM failover layer to ensure near-zero downtime and sub-100-millisecond response times. Spendwise operates on three core rules: approving purchases within budget limits, tapping an emergency buffer when limits are slightly exceeded, and automatically rolling over unused funds at the start of new budget cycles. To work around cloud hosting restrictions on standard SMTP ports, the app routes email reports through a cascading chain of HTTPS-based email gateways including Mailjet, SendGrid, and Brevo. The project is openly available on GitHub, with a live deployment hosted on Render Cloud.

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