Bank Web Application
ProductionAssociate SDE → Senior Software Development Engineer•April 2019 - August 2022•Team: 6-8 developers
Developed a sophisticated financial dashboard application for a leading US fintech company, serving thousands of users with complex financial data visualization and management capabilities. The application handles sensitive financial information with bank-level security while providing an intuitive user experience for personal finance management.
Technologies Used
ReactTypeScriptGraphQLApollo ClientMaterial UIReduxJestEnzymeSass
Key Achievements
- ✓Achieved 98-99% code test coverage across all modules
- ✓Successfully launched referral program resulting in 25% user growth
- ✓Reduced customer support tickets by 30% through improved UX
Key Features
•Comprehensive referrals program with tracking and rewards
•Dynamic promotional offers system with personalization
•Secure Plaid integration for external account linking
•Real-time financial data visualization with GraphQL
•Advanced transaction categorization and budgeting tools
•Investment portfolio tracking and analytics
•Bill payment and scheduling functionality
•Mobile-responsive design with Material UI
•Comprehensive error handling and user feedback
•Advanced security features including 2FA
Challenges
- ⚡Implementing secure financial integrations with third-party services
- ⚡Achieving and maintaining 98-99% test coverage across the application
- ⚡Managing complex application state with Redux in a large codebase
- ⚡Ensuring GDPR and financial regulation compliance
- ⚡Optimizing performance for real-time financial data updates
Solutions
- 💡Implemented comprehensive encryption and security protocols
- 💡Developed detailed testing strategies using Jest and Enzyme
- 💡Created well-structured Redux store with clear data flow patterns
- 💡Worked closely with compliance team to ensure all regulations were met
- 💡Used GraphQL subscriptions and optimistic updates for real-time experience
Achievements & Impact
🏆Achieved 98-99% code test coverage across all modules
🏆Successfully launched referral program resulting in 25% user growth
🏆Reduced customer support tickets by 30% through improved UX
🏆Implemented features that directly contributed to $2M+ in revenue
🏆Received recognition for code quality and development practices
Lessons Learned
- 💭The critical importance of security in financial applications
- 💭How comprehensive testing strategies save time and prevent issues
- 💭The value of user feedback in driving product decisions
- 💭How to effectively work with regulatory requirements in software development