I'm a Graduate Computer Science student at Vanderbilt University specializing in low-level systems programming, high-performance backends, distributed systems, and resilient cloud platform engineering.

• Vanderbilt University Mathematics Department | Platform Architect & Software Engineer (Jan – May 2024)
  • Engineered Proofdesk, a collaborative Web IDE sandbox, reducing textbook compilation latency by 72% (from 1.1s to 300ms) via client-side WebAssembly (Pyodide).
  • Deployed WebSocket sandboxed terminal runtimes (node-pty) inside resource-restricted Docker containers (512MB RAM limit).
  • Architected a distributed background worker task queue using Redis and BullMQ with local fallback loops.
• VU-BEAM Lab, Vanderbilt University | Software Engineer Research Assistant (Oct 2025 – Present)
  • Designed high-throughput data processing loaders on multi-GPU nodes to handle real-time medical sensor streams.
  • Optimized core numerical compute pipelines in PyTorch, reducing execution latency by 40%.

• 🏫 Vanderbilt University (Nashville, TN) | Master of Science in Computer Science (Expected Jun 2027)
• 🎓 Vellore Institute of Technology (VIT) (Chennai, India) | Bachelor of Technology in Computer Science (Graduated May 2025)

• Engineered a high-performance LSM-Tree database storage engine in C++20.
• Implemented asynchronous, non-blocking Write-Ahead Log (WAL) appends utilizing Linux io_uring with O_DIRECT, completely bypassing the kernel page cache.
• Engineered a concurrent, lock-free SkipList MemTable with atomic CAS pointers and a custom bump-pointer memory Arena.
• Restricted read lookup penalties to at most one CPU cache line miss using 64-byte cache-aligned vectorized Block Bloom filters.

• Architected a browser-based collaborative textbook IDE with a Monaco-editor frontend and sandbox terminals.
• Ported the compiler pipeline to the client using WebAssembly (Pyodide), reducing book compilation latency by 72% (from 1.1s to 300ms).
• Engineered isolated, resource-restricted sandbox container runs using WebSocket streams, node-pty, and Docker.
• Implemented a resilient, distributed task queue worker pool using Redis and BullMQ with local fallback loops.

• Designed a highly resilient gateway routing layer mapping auth, billing, and user microservices.
• Built custom SRE Circuit Breakers supporting CLOSED, OPEN, and HALF-OPEN states to mitigate cascading microservice failures.
• Programmed a concurrent sliding-window rate limiter using Redis Sorted Sets (zsets) with in-memory fail-open fallback.
• Benchmarked to sustain over 25,000 requests per second (P99 latency < 15ms).

• Designed a horizontally scalable telemetry ingestion gateway, decoupling write paths using a Redpanda (Kafka-compatible) event log.
• Implemented double-layer idempotency utilizing Redis edge lock-checks and atomic PostgreSQL upserts.

• IEEE Published (2025): An Integrated GCN–GAT–AE Framework for Robust Anomaly Detection in Industrial IoT Environments — Developed an integrated deep learning framework combining Graph Convolutional Networks (GCN), Graph Attention Networks (GAT), and Autoencoders (AE) for robust and noise-resilient anomaly detection in Industrial IoT sensor networks.
• Vanderbilt Global Good Hackathon Finalist (2025): Co-developed ARIA Pathfinder, a PostGIS-backed disaster response routing system utilizing Dijkstra with time-decaying edge weight equations.
• GDSC Technical Lead (2024–2025): Co-lead of the Technical Division for the Google Developer Student Club (GDSC) at VIT, conducting technical workshops for 200+ student members.

• LinkedIn: linkedin.com/in/harsharajkumar273
• SDE Portfolio: harsharajkumar-273.github.io/SDE-Portfolio/
• Email: harsharajkumar273@gmail.com