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 compilation feedback 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 | Research Assistant (Oct 2025 – Present)
  • Designed ReCL (Reconstructive Contrastive Learning), a self-supervised ultrasound model evaluated against baselines on the PICMUS benchmark.
  • Achieved 85% improvement in image contrast (CNR: 3.5+ dB); outperformed CycleGAN by 20% on clinical cardiac data.
  • Optimized offline batch-processing data pipelines across 10,000+ ultrasound scan frames, reducing multi-GPU training execution time 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 (254,000+ ops/sec).
• 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 horizontally scalable telemetry ingestion gateway, sustaining 50,000+ metrics/sec across distributed Redpanda (Kafka-compatible) event streams.
• Guaranteed sub-8ms HTTP 202 ingestion ACKs by decoupling write paths from persistence using device ID hash partition keys.
• Implemented double-layer idempotency utilizing Redis SETNX edge locks and atomic PostgreSQL upserts executing 1,000-row batch transactions in < 15ms.

• Developed a high-performance text deduplication engine in C++20 using zero-copy token shingling (std::string_view), reducing memory allocations by 65%.
• Parallelized 128 universal hash variants across 256-bit CPU registers using AVX2 SIMD vectorization primitives, achieving a 4.2x speedup in MinHash generation (22,450+ tokenized streams/sec).
• Engineered a concurrent, slab-allocated LSH index using reader-writer locks (std::shared_mutex) productized as a Reddit Developer Platform (Devvit) moderation app.

• PyTorch Core Contributor (2026): Merged PR #191092 in the PyTorch core repository (reviewed by PyTorch Core Maintainers).
• IEEE Published Paper (2025): An Integrated GCN–GAT–AE Framework for Robust Anomaly Detection in Industrial IoT Environments (Published in IEEE Xplore).
• 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 Google Developer Student Club (GDSC), conducting technical workshops for 200+ student members.

• LinkedIn: linkedin.com/in/harsharajkumar273
• Website Portfolio: hashadev.duckdns.org
• Email: harsharajkumar273@gmail.com