Santanu Kumar Kar

Software Engineer

Flipkart•  February 2019 - Present

‭ Software Development Engineer 3‬ ‭ SEP 2023 - PRESENT‬ ● ‬‭ Collaborate with product managers and other stakeholders to define requirements, design‬ ‭ scalable solutions, break down tasks, plan iterations, estimate timelines, and coordinate across‬ ‭ teams to deliver on time with full functional accuracy.‬ ● ‬‭ Responsible for ensuring quality through code reviews, process adherence, mentoring, and‬ ‭ knowledge sharing with peers.‬ ● ‬‭ Led design and implementation of backend systems for Flipkart's Hyperlocal business 'Minutes', ‬delivering within 3 months.‬ ● ‬‭ Spearheaded NFR tests and backend optimizations for sale events in 2024, increasing API‬ throughput by 30% for backend system powering customer experience pages.‬ ● ‬‭ Optimized a legacy CRM system to handle 80,000 concurrent customer support representatives,‬ up from 50,000, enabling Flipkart's Hyperlocal expansion.‬ ● ‬‭ Re-architected and deployed an Apache Spark-based offline processing system, enabling the‬ ‭ operations team to execute bulk actions, including cancellations and returns, with improved‬ ‭ efficiency. The transformation from a sync to async system reduced the time required to process‬ ‭ 20,000 records from 15-20 minutes to under 1 minute. Led the project end-to-end, mentoring an‬ ‭ engineer to meet estimates and defining a roadmap for future migrations..‬ ● ‬‭ Guided and mentored fellow engineers in scaling up and optimizing multiple services for big sale‬ ‭ events.‬ ‭ Software Development Engineer 2‬ ‭ FEB 2021 - SEP 2023‬ ● ‬‭ Owned and scaled up the transactional communication system with micro-optimizations to achieve‬ - 93% increase in throughput, 91% lower database load average, 77% lower database CPU usage‬ ‭ and 1/200th API call latency.‬ ● ‬‭ Re-engineered the communication system for improved maintainability, developer efficiency, and‬ ‭ faster product-driven changes. Led migration of all communication flows to the new system.‬ ● ‬‭ Worked on an API gateway to modularize CX pages like 'order details' 'order confirmation', etc.,‬ ‭ enabling faster feature development and A/B testing capability.‬ ● ‬‭ Led the integration with a 3rd party vendor for inbound telephony for skill-based routing of calls‬ ‭ from customers, resulting in a 90% improvement in connect rates and unblocking additional‬ ‭ capabilities.‬ ● ‬‭ Established team standards for deployment cycles, reducing on-call bandwidth.‬ ‬ ● ‬‭ Involved in hiring as an interviewer for technical competencies for Fulltime SDE1s, SDE2s, interns,‬ ‭ and contract engineers.‬ ‭ Software Development Engineer 1‬ ‭ FEB 2019 - FEB 2021‬ ● ‬‭ Part of the customer experience engineering team, developing and maintaining systems for‬ ‭ transactional communications (Email, SMS, PN) between Flipkart and customers.‬ ● ‬‭ Built multiple cost-cutting features for SMS communications which resulted in annual savings of‬ ‭ more than 30 Crore Rs.‬ ● ‬‭ Created a tool for product managers to generate all variants of communication templates, quickly‬ ‭ achieving SMS compliance with government regulations (TRAI DLT)

Software Engineer

Furlenco•  November 2018 - February 2019

Backend development of microservices dealing with accounting, billing, invoicing of monthly‬ ‭ rentals, and refund processing (integration with external refund providers and refund‬ ‭ communications).‬

SDE-Intern

Amazon•  January 2018 - June 2018

Worked on RESTful web services dealing with seller onboarding, verification, and identification.‬ ‭ Created solutions for removing developer pain points, and improved software release process.‬