Building payment systems processing 300K+ daily UPI transactions and real-time market data infrastructure serving 13M+ active users with <10ms latency.

• →Architected UPI payment system from scratch, now handling 300,000+ successful transactions per day across Groww's 13M+ user base
• →Built real-time market data streaming using Kafka Streams and Redis with <10ms latency for price triggers and Option Greeks - critical for live trading
• →Created centralized response code management system handling 20,000+ error mappings, used across the team's microservices
• →Owned observability for the payments pod - learned PromQL and Grafana, built dashboards tracking every useful metric across services
• →Single-handedly built backend-driven home page serving personalized content to millions of users, enabling 3 product teams to run experiments

Built payment backend infrastructure with Java Spring Boot, Apache Kafka, and Redis. Created custom annotations adopted across 95% of team's microservices.

• →Delivered payment processing solutions using Java Spring Boot, Apache Kafka, and Redis for consumer-facing features
• →Pitched and built custom Spring Boot annotations for multi-datasource management - now used across 95% of team's microservices, implementing patterns like CQRS
• →Owned development of internal SDKs and services, implementing scalable design patterns for distributed systems

Optimized high-performance backend systems for Payments team, focusing on merchant/consumer services.

• →Earned pre-placement offer through exceptional contributions to high-scale microservices
• →Impacted full lifecycle of payment services from development to deployment
• →Pioneered documentation standards enhancing team knowledge transfer

Delivered premium software development services to international clients.

• →Maintained perfect 5-star rating across all client engagements
• →Developed custom solutions spanning multiple industries

Built peer-to-peer ATM cash network connecting cash seekers with providers through mobile app. Firebase backend with Flutter frontend.

• →Designed and built complete systems from scratch: Dynamic-linking-based user referral system, dual-sided rating system, CRON-scheduled data processing pipeline handling 300,000+ daily records
• →Encapsulated Openrouteservice and Nordigen APIs with data models and unit tests, adding location-based cash matching and EU banking connectivity
• →Built serverless cloud function models for trigger-based database operations with authentication

Led IoT-integrated cross-platform application development.

• →Designed system architecture and microcontroller units
• →Developed backend and cross-platform interface for custom IoT devices