OnLedger Portfolio Management

OnLedger was developed as a modern portfolio management platform for individual investors who wanted better tools to track and share their investment strategies. The platform needed to work seamlessly across web browsers, iOS devices, and Android phones, requiring a robust API-first architecture.

I was responsible for designing and developing the complete REST API layer that powers all client applications. The API handles everything from user authentication and portfolio CRUD operations to real-time portfolio valuation and historical performance tracking.

One of the unique social features of OnLedger is the ability to share portfolios with other users. Investors can invite friends or followers to view their portfolios, creating a social investing experience where users can learn from each other's strategies. I implemented granular permission controls so users could choose exactly what information to share - from full transparency to anonymized performance metrics only.

The API was designed with mobile clients in mind, implementing efficient pagination, caching strategies, and optimized payloads to ensure snappy performance even on slower network connections. I used Spring MVC for the API layer with Hibernate for data persistence in MySQL.

The application was deployed on AWS Elastic Beanstalk, providing automatic scaling to handle traffic spikes during market hours when user activity peaks.