Engineering Case Study
Problem
A FinTech startup needed a secure, real-time dashboard to manage decentralized crypto-lending protocols. The challenge was to bridge the gap between traditional web infrastructure and blockchain networks without compromising security or user experience.
My Role
Lead Full Stack Engineer.
Technical Challenges
- State Synchronization: Ensuring real-time consistency between on-chain blockchain transactions and the off-chain relational database.
- Wallet Integration: Safely handling non-custodial Web3 wallet connections directly in the browser.
- Security: Designing a highly secure API layer to prevent race conditions and replay attacks during lending events.
Solution
I engineered a hybrid architecture utilizing Next.js for a hyper-responsive frontend and a Laravel backend for secure off-chain processing:
- Frontend: Custom React hooks to manage Solana wallet states and handle RPC node communications directly from the browser.
- Backend: Built a queue-driven Laravel worker system using Redis to asynchronously poll and verify on-chain transaction signatures before updating PostgreSQL.
- Security: Enforced strict cryptographic nonce-based authentication for all API endpoints communicating with the Web3 interface.
Tech Stack
- Frontend: Next.js, React, TypeScript, Tailwind CSS
- Backend: Laravel, PHP, Redis, PostgreSQL
- Infrastructure: Docker, Linux VPS
Outcome
Successfully launched the platform, handling thousands of secure crypto transactions in its first month. The asynchronous queueing architecture ensured zero dropped transactions and maintained a 100% data integrity record.