Spend Sync
A personal finance management hub concept designed to unify a user's financial life. Spend Sync securely connects to multiple bank accounts to provide a holistic view of spending, track budgets, and offer data-driven insights for better financial health.
A secure FinTech application using Plaid for read-only bank data aggregation. It features application-layer encryption (AES-256) for all sensitive data stored in Firestore, ensuring that financial information remains confidential even from database administrators.
The Challenge
The primary challenge in any FinTech application is trust. I had to build a system that could handle incredibly sensitive financial data with absolute security. A secondary challenge was dealing with the unreliability of third-party banking APIs, which can often be slow or return inconsistent data.
The Solution
I implemented end-to-end encryption at the application layer using AES-256, ensuring that sensitive financial data is encrypted before it is even stored in the database. For API integration, I built a resilient data-fetching layer with automated retries and error-handling logic to gracefully manage flaky connections from banking APIs like Plaid and Yodlee.
Solution Architecture
A visual diagram of the system's components and data flow is available.
Gerasimos Makris is an AI Web Developer with a background in FinTech operations. He specializes in building secure, scalable web applications that solve real-world financial problems. When he's not coding, he enjoys exploring the intersection of technology, finance, and business strategy.
