Best of FintechJuly 2025

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    Article
    Avatar of controversycontroversy.dev·47w

    Is being over-employed unethical or just efficient?

    A software engineer is being sued for allegedly working multiple full-time jobs simultaneously without disclosure, raising questions about employment ethics in the remote work era. The case highlights the evolving nature of knowledge work and whether traditional employment expectations still apply in an async, AI-powered workplace.

  2. 2
    Article
    Avatar of selfhostedselfhosted·44w

    PersonalAccounter , Simple Self-Hoster Personal/Small-Corporate Accounting Software

    PersonalAccounter is a PHP-based self-hosted accounting management system designed for personal and small corporate use. It offers expense tracking, subscription management, and reporting capabilities with easy deployment and user-friendly interface.

  3. 3
    Article
    Avatar of growwenggGroww Engineering·43w

    Making a Real-Time Stock Screener in Groww

    Groww built a real-time stock screener handling 2+ million writes per minute using a single 4-core MySQL instance. The system uses in-memory aggregation to reduce database writes, CDN-based hash caching to handle 50K reads per minute, and a custom query language for extensible filtering. Key optimizations include buffering tick data in memory, selective persistence of minute-level aggregates, and 30-second CDN caching that reduced backend load by 80%. The modular architecture powers multiple screener types and enables rapid feature development.

  4. 4
    Article
    Avatar of bytebytegoByteByteGo·44w

    How Nubank Uses AI Models to Analyze Transaction Data for 100M Users

    Nubank processes transaction data from 100 million users using transformer-based foundation models instead of traditional manual feature engineering. Their system converts raw transactions into tokenized sequences, trains models using self-supervised learning on trillions of transactions, and combines sequential embeddings with tabular data through joint fusion architecture. The centralized AI platform allows teams across the company to access pretrained models for various financial tasks like credit scoring, fraud detection, and personalization.