Sagnik Guru

Gupshup

• Implemented an agentic workflow using Cursor connected to Jira and GitLab MCP servers, enabling automated planning, task syncing, increasing developer productivity by 30–40% across teams.
• Drove infrastructure efficiency by consolidating underutilized microservices, achieving a 20% cost reduction while improving scalability under variable workloads.
• Optimized system performance by transitioning call latency from RabbitMQ HTTP queues to asynchronous executor-based calls, reducing peak latency by 1 second.
• Revamped CI/CD pipeline by replacing Jenkins with GitLab CI, automating deployment scripts and cutting deployment time by 85% (2 hrs → 10–20 mins).
• Cut $300/day DB cost by re-architecting reporting for 200M+ rows / 100GB+ daily data, migrating to MySQL 8 JSON, and reducing 66M Redis inserts/day.

• Engineered a high-throughput event-forwarding system for WhatsApp Self-Serve using RabbitMQ, reliably processing 50M+ daily events and improving reliability by 15–20%.
• Designed and maintained backend systems powering 10B+ messages/month with high availability and horizontal scalability.
• Built a centralized template service with Spring Boot, Redis, and MySQL supporting real-time subscription-based sync, reducing latency by 60% (20ms→8ms).
• Led zero-downtime migration of webhook configuration from legacy app details to subscription schema, enabling granular mode support with zero message loss.
• Upgraded services from Java 8 to Java 17, improving performance, maintainability, and overall system security.
• Built WhatsApp Core Messaging v3 APIs, reducing integration and dev effort by 50%.
• Integrated Meta Business Cloud APIs to conduct POCs for Dynamic Flows, Meta Voice, and Per Message Pricing.

• Languages & Frameworks: Java, JavaScript, TypeScript, Spring Boot, Express, Fastify, Next.js
• Databases, Messaging Queues& Cache: MySQL, PostgreSQL, MongoDB, Redis, RabbitMQ, BullMQ, Zookeeper
• Tools & Architecture: Docker, AWS EC2, PM2, GitHub Actions, Turborepo, Microservices, System Design, OOD, REST APIs

• Secured rank 1694 / 77257 in GATE Computer Science 2022 [Scorecard]
• Solved 300+ problems on LeetCode[LeetCode]

CodePulse

• Developed an end-to-end coding platform with multi-language support (Python, Java, C++, JavaScript).
• Implemented secure sandboxed Docker execution with memory/time limits and real-time WebSocket feedback.
• Built scalable microservices (Problem, Submission, Evaluator, Socket) with async queues.
• Created responsive UI with Monaco editor, problem filtering/pagination, and admin management.
• Deployed on AWS EC2 with GitHub Actions CI/CD, PM2, Turborepo, and pnpm.