Kaustubh Patange
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Hello, I'm

Kaustubh
Patange

▊

Building high-performance backend systems, AI-powered platforms, and contributing core numerical computing to open source.

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/01Where I've Worked

Experience

Google Summer of Code Contributor

@stdlib-js/stdlib
May 2026 — Present
  • ◆Extending Level 2 and Level 3 BLAS routines (real and complex) in JavaScript, C, and Fortran for near-native performance in Node.js.
  • ◆Implementing a three-layer API architecture (CBLAS-compatible interface, strided-array compute kernels, and ndarray wrappers) with loop unrolling and cache-friendly memory-access optimizations.
JavaScriptCFortranNode.jsBLAS

Core Contributor

@stdlib-js/stdlib
Nov 2025 — Apr 2026
  • ◆Shipped 200+ merged PRs spanning BLAS routines, statistical reductions, and native C add-ons, each with full test suites, benchmarks, and documentation.
  • ◆Designed 60+ ndarray API packages and numerically stable computation kernels in JavaScript and C; reviewed community PRs to enforce strict API design, testing, and documentation standards.
JavaScriptCNode.jsNumerical ComputingOpen Source

Software Developer

@Nexentia
Jul 2025 — Sep 2025
  • ◆Built backend services and secure REST APIs for a Warehouse Management System, with indexed relational schemas, ACID transactions for stock consistency under concurrent orders, and JWT role-based access.
Next.jsExpressPostgreSQLREST APIs

/02What I've Built

Featured Projects

01

LLM Inference Engine

Built from Scratch on Apple Silicon

Engine serving Qwen3.5-2B (hybrid Gated DeltaNet + attention) in INT4 on an 8 GB MacBook Air via an OpenAI-compatible API with continuous batching, paged KV cache, and chunked prefill. Hand-written Metal kernels (quantized matvec, paged attention, batched DeltaNet step) raised 8-stream decode from 43 to 116 tok/s, 1.6x MLX-LM and 1.9x llama.cpp on the same machine. Verified against Hugging Face Transformers to ≤3.8e-6 per layer in fp32, with calibrated mixed-precision INT4 at KL 0.045 and 700+ automated checks.

PythonPyTorchMetal (MSL)Objective-C++FastAPI
Source
02

32 Bytes

Embedding Search with Cohere Embed 5

Studied retrieval at 8 KB (float), 1 KB (int8), and 32 B (binary) per page with a two-stage search (binary first pass, int8 re-check), evaluated with RCP-nDCG on ViDoRe v3 using clustered bootstrap CIs and Holm correction. Hand-wrote Metal kernels for exact top-100 over 10M binary codes in 4.45 ms (1.2x FAISS, up to 4.3x batched) at 78 GB/s, and found and reported 3 reproducible issues in Cohere’s open-source rcp-ndcg evaluation library.

PythonMetal (MSL)FAISS
Source
03

Corpora

Multimodal Agentic RAG Platform

Multi-tenant agentic RAG pipeline using LangGraph with hybrid vector search (dense + BM25, RRF fusion) and cross-encoder reranking — streaming citation-grounded answers over SSE at 31ms p95 retrieval latency. Async ingestion, CLIP text-to-image search, CI-gated retrieval evals, Clerk JWT multi-tenancy, and Langfuse observability.

Next.jsLangGraphQdrantPostgreSQLRedis
Live Demo Source
04

CoSketch

Real-time Collaborative Whiteboard

Low-latency real-time collaboration system using persistent WebSocket connections to synchronize canvas operations across multiple concurrent users. Event-driven canvas state architecture for drawing, shape transformations, and persistent workspace management.

Next.jsTypeScriptWebSocketsPostgreSQL
Live Demo Source
More on GitHub

/03Client Work

Freelance Work

01

Aakar Design Studio

Freelance Engagement

Architected a CMS-backed studio portfolio end-to-end using Next.js 15 and Sanity, empowering non-technical staff to seamlessly manage the homepage, project catalogs, and media galleries. Owned SEO and serverless deployment via Cloudflare Workers (OpenNext) with KV edge caching — dynamic sitemaps and JSON-LD structured data for full search indexability.

Next.js 15Sanity CMSCloudflare
Visit Site

/04My Toolbox

Technical Skills

Languages

CC++JavaPythonJavaScriptTypeScriptFortran

Frameworks

Express.jsNode.jsEJSFastAPIReact.jsNext.jsTailwindCSSBootstrap

AI & ML

PyTorchHugging FaceMetal (MSL)INT8/INT4 Quantizationllama.cppMLXLangGraphFAISS

Tools & Infra

BashREST APIPostmanGitDockerAWSKafkaRedisMongoDBSupabasePostgreSQLSQL
C ✦C++ ✦Java ✦Python ✦JavaScript ✦TypeScript ✦Fortran ✦Express.js ✦Node.js ✦EJS ✦FastAPI ✦React.js ✦Next.js ✦TailwindCSS ✦Bootstrap ✦PyTorch ✦Hugging Face ✦Metal (MSL) ✦INT8/INT4 Quantization ✦llama.cpp ✦MLX ✦LangGraph ✦FAISS ✦Bash ✦REST API ✦Postman ✦Git ✦Docker ✦AWS ✦Kafka ✦Redis ✦MongoDB ✦Supabase ✦PostgreSQL ✦SQL ✦C ✦C++ ✦Java ✦Python ✦JavaScript ✦TypeScript ✦Fortran ✦Express.js ✦Node.js ✦EJS ✦FastAPI ✦React.js ✦Next.js ✦TailwindCSS ✦Bootstrap ✦PyTorch ✦Hugging Face ✦Metal (MSL) ✦INT8/INT4 Quantization ✦llama.cpp ✦MLX ✦LangGraph ✦FAISS ✦Bash ✦REST API ✦Postman ✦Git ✦Docker ✦AWS ✦Kafka ✦Redis ✦MongoDB ✦Supabase ✦PostgreSQL ✦SQL ✦

/05Learning & Recognition

Education & Achievements

Education

Walchand Institute of Technology

Solapur, Maharashtra, India

B.Tech in Computer Science and Engineering

Minor in Electronics & Telecommunication Engineering

CGPA 8.98Aug 2023 — Apr 2027

Related Coursework

◆ Linear Algebra

◆ Digital System Design

◆ Database Management Systems

◆ Scientific Computing

◆ Distributed Systems

◆ Data Structures & Algorithms

LeetCode

Profile

Solved 200+ data structure and algorithm problems.

stdlib Member

Repository

Member of the numerical library stdlib on GitHub.

Anthropic

Anthropic

Part of Anthropic's Claude Open Source Program.

Cohere Labs

Cohere Labs

Active member of the Open Science Community.

/06Let's Connect

Get In Touch

Open to internships, freelance work, open source collaboration, and interesting engineering problems. Inbox always open — I'll get back fast.

Email

kaustubh.mp007@gmail.com

GitHub

MeKaustubh07

LinkedIn

kaustubh-patange

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