SaaS ARCHITECTURE & FINTECH INTEGRATION

Crawleo: A Production-Grade AI Infrastructure

Architecting the bridge between LLMs and the live web with enterprise-grade reliability.

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Overview

Crawleo is a comprehensive SaaS solution built to solve the 'knowledge cutoff' problem for AI models. Beyond the core crawling engine, the true engineering feat lies in its backend architecture. I designed a system that handles high-concurrency API requests with a strict zero-data retention policy while managing a complex financial lifecycle. The project implements the Model Context Protocol (MCP) to allow direct integration with AI agents like Claude and Cursor. The backend is a testament to Clean Architecture, featuring a highly scalable, event-driven system that handles subscription states, metered billing, and real-time webhooks with absolute precision.

Key Achievements

Architected a robust, event-driven payment system using Paddle, handling complex webhook scenarios (race conditions, idempotency) to ensure 100% data consistency between payment provider and database.

Implemented a sophisticated subscription lifecycle management system, handling auto-renewals, proration, plan upgrades/downgrades, and manual subscription overrides with automated cron jobs.

Engineered the Model Context Protocol (MCP) server, enabling seamless, bi-directional communication between the API and local AI development environments (Claude Desktop, Cursor).

Designed the codebase strictly adhering to SOLID principles and Separation of Concerns, utilizing a layered architecture (Controllers, Services, Repositories) to ensure maintainability and testability.

Built a custom, high-performance middleware pipeline for API key validation, rate limiting, and quota management using Redis for low-latency checks.

Developed a 'Guest-to-Customer' conversion pipeline to prevent ghost transactions, ensuring every payment is correctly linked to a user identity before checkout initiation.

Created a resilient 'Upsert' logic for database operations to handle concurrent webhook events, eliminating duplicate key errors and ensuring data integrity.