Headline

Software Engineer @PW | Building systems that power learning experiences

About

Software Engineer at Physics Wallah, building high-scale backend systems that power learning experiences for millions of students across India. At PW, I work on critical platforms where scale and reliability directly impact outcomes for students learning and preparing for high-stakes exams. My work spans core systems like the Orders & Payments platform (driving seamless checkout journeys) and NSAT, a national-level scholarship exam system handling millions of registrations and evaluations. I focus on designing scalable, resilient systems, reducing latency, optimizing heavy data workflows, and building architectures that can handle peak loads. My stack includes NestJS, TypeScript, MongoDB, PostgreSQL, Redis, and Kafka, with an emphasis on clean system design and operational robustness. Previously at IBM India, I built Retrieval-Augmented Generation (RAG) systems, solving real-world challenges like hallucination control, semantic retrieval, and context optimization which sparked my interest in applied AI systems at scale. I’m particularly interested in building backend systems where engineering decisions directly influence user outcomes, and in leveraging AI-assisted development to ship faster, iterate smarter, and continuously raise the bar on engineering quality.

Location

Noida

AI stack

antigravity

cursor

opencode

Work experience

SDE at PW (PhysicsWallah), Apr 2025 - Present · 1 yr 5 mos, Noida, Built PW Cash (a closed loop digital wallet) integrated into the checkout flow of multiple independent PW bussiness (PW App, PW Books), allowing users to earn and redeem cashback seamlessly; Automated the flow of rank calculation, scholarship computation, and notifications for 10–15L students for NSAT examination by building internal tool to track real-time pipeline visibility and self-serve operations, eliminating manual tech team escalations. Built a configurable Kafka-based blocking engine to enforce phase-level blocking of students from registering in scholarship entrance exam, based on performance in previous phase or other bussiness requirements. Developed an aggregation service for one-call retrieval of complete student journeys, reducing manual lookup time by around 50% for academic counsellors.

Software Engineer Trainee at PW (PhysicsWallah), Oct 2024 - Apr 2025 · 7 mos, Noida, Uttar Pradesh, India

Software Engineer Intern at IBM, Jul 2024 - Oct 2024 · 4 mos, Kochi, Built an AI powered support assistant for IBM Watsonx OpenScale using RAG, enabling employees and customers to get instant answers from product documentation and historical support conversations, significantly reducing manual support effort. Developed a retrieval pipeline with Milvus, LangChain, semantic chunking, and Hugging Face embeddings, improving response accuracy and automatically routing unanswered queries by tagging the most relevant subject matter experts.

Smart Contract Auditor at PESU Venture Labs, Jan 2024 - Mar 2024 · 3 mos

Web3 - Solidity Developer at PESU Venture Labs, Dec 2023 - Jan 2024 · 2 mos

Blockchain Intern at QuillAudits - Web3 Security 🛡️ ,📍 ETHDubai, Mar 2023 - Jun 2023 · 4 mos, Remote

Core Team Member at GDSC IIIT Kottayam, Sep 2022 - Aug 2023 · 1 yr, Kottayam, Kerala, India

Education

Bachelor of Technology - BTech, Computer Science, Indian Institute of Information Technology Kottayam

Podar International School, Jalna

Public links

github: https://github.com/dhananjay-14