Krishanjit Rajbongshi

2+ years of work experience

Jun 20251 yr 4 mosPresent

Reels Recommendation & Retrieval: Owned a recently-viewed product-recommendation service (candidate retrieval) for the Reels feed end-to-end — built a low-latency gRPC retrieval flow that lifted click-through rate (CTR) by 120% on the native surface and 70% in-feed while cutting P99 latency by 50%. Won two internal engineering awards (LightSpeed, Panchayat). For-You Feed Platform Migration: Migrated the personalised “For-You” product feed from a legacy service onto a new in-house unified ranking/retrieval platform — built the config-resolver, candidate-aggregation and gRPC response layers plus a Java client for downstream teams, and a parity-testing harness that verified 95–97% output parity with the legacy system. Smartphone Category-Page Personalisation: Designed and shipped a personalised product-recommendation server for the smartphone category landing page, data store (Scylla), serving pipeline and A/B-test configuration and launched it as a live experiment. Search Retrieval Caching Layer: Built a read-through cache in front of Elasticsearch for keyword-based search — serves candidate lists from a low-latency ScyllaDB cache and, on a miss, falls back to Elasticsearch while asynchronously backfilling the cache, cutting search-retrieval latency and Elasticsearch load. Added per-region filtering, relevance scoring and cursor pagination.

Jul 20241 yrJun 2025

Designed and implemented synchronisation of shared data across databases of distributed microservices using Debezium for Change Data Capture (CDC) and Redpanda as the event streaming platform. The solution enables real-time, reliable data propagation by leveraging parallel topic consumption for high throughput and retry mechanisms to ensure consistency during sync failures Part of the development team to increase SEO traffic of the listing pages. Implemented migration of existing APIs from PHP to JAVA micro service, enabling faster response time and increase in the google ranking. Led the development of the new campaign creation tool called ASSURED, aimed at bringing all external transactions to the system and increasing monthly revenue by INR 1 Cr. Implemented a strategy to fetch the transactions via LeadSquared and store them in the system and process the transactions. Developed the Reach Voice plan to increase inventory for selling ads in a city and locality regions, refactoring the previous logic to enable selling more slots to clinics/hospitals to increase revenue. Developed the Reach Spotlight plan to enhance user engagement by offering clinics a platform to advertise, driving a 10% increase in annual revenue. The project involved backend development to store media, mapping campaigns to media reference to publish ads in the listing page.

Jan 20247 mosJul 2024

Implemented integration with Leadsquared API, enabling the tracking of new types of activities for leads. This integration helped enhance lead tracking capabilities, improving the team’s ability to measure lead engagement, resulting in better conversion rates. Worked on the integration of Sensodyne campaign, which enabled users to redeem coupons for product discounts. This integration helped boost user engagement and foster partnerships with new brands.