Sachin Kumar

• Designed and built CROP(), a custom SQL extension, end to end — a custom parser extracts the call, a wrapper node carries it through the logical plan, an optimizer rule rewrites the projection, and a scalar UDF evaluates the predicate tree over GeoArrow arrays. • Built an asynchronous map_match() UDF that snaps raw GPS trajectories onto the road network through a GraphHopper service, usable on the fly in a query or at import time to persist a matched geometry column. • Implemented spatial filter pushdown

* Implemented an authentication sequence in the bot to prompt identity verification for unrecognized users prior to proceeding. * Engineered an inventory update pipeline for customer bot tables, facilitating real-time product display for end users, scalable to 200k products per bot. * Developed a testing module for bot validation, allowing users to input utterances and FAQs to verify correct bot flow activation, significantly decreasing bot testing time.

* Refactored a Django-based Parking Management System to Golang, overseeing the full development lifecycle and maintaining sole codebase ownership. * Enhanced vehicle ingress/egress efficiency via RFID and Fastag integration, achieving sub-2-second processing. * Engineered a flexible system architecture for site-specific customization, including Fastag billing options and access control by vehicle type

Worked for 3 months, during the period I worked on React Js and with the team, transformed a web-app into a fully fledged react-app.

Interning at EatMyNews helped me polish my soft skills. During the internship, I submitted 24 articles, few of which were highly appreciated by the readers and my teammates. Along with content writing, I gained an insight into content marketing as well.

Master's thesis: "From Query Plans to Native Code: Integrating MLIR-Based Query Compilation in DuckDB". Built one system with two execution paths: a query is planned once by DuckDB, then either runs on its vectorized engine or is translated to MLIR and compiled to machine code by LingoDB. Moved the