Om Dandagvhal OMD-123

🎯 About Me

// 💡 Daily system design practice in TypeScript
const om = {
  name:           "Om Dandagvhal",
  role:           "Final-Year B.Tech IT @ SITRC, Nashik",
  class:          "BE 2026-27 | Group 37 | Roll 70",
  pronouns:       "he/him",
  location:       "Nashik, Maharashtra 🇮🇳",
  email:          "omd4485@gmail.com",
  phone:          "+91 9970055620",
  currently:      [
    "🚀 Day 6: Distributed Backend System Design",
    "📊 Capstone: Multimodal Sentiment Analysis (MinHash LSH)",
    "🎯 Actively applying for Summer 2026 Backend Internships",
    "📦 Published: @omdd/agent-loop-guard on npm"
  ],
  interests:      ["Distributed Systems", "API Design", "Cloud Native", "Open Source", "AI Safety"],
  funFact:        "I ship one production-ready backend system every week 📦",
  philosophy:     "Learn by building. Ship by shipping. Improve by iterating."
};

🛠️ Tech Stack & Tools

💻 Languages _{JavaScript • TypeScript • Python • Go • Java • C++}	🌐 Frameworks _{Node.js • Express • React • Next.js • Tailwind • Bootstrap}	🗄️ Databases & Cache _{MongoDB • PostgreSQL • MySQL • Redis • Prisma}
☁️ DevOps & Cloud _{Docker • Kubernetes • AWS • GCP • Nginx • Linux}	🔧 Tools & Build _{Git • GitHub • VSCode • Vercel • Netlify • Figma}	🔗 APIs & Protocols _{GraphQL • gRPC/Protobuf • REST • WebSocket • Kafka}
⛓️ Blockchain & Others _{Solidity • Hardhat • Web3.js • Ethers.js • BullMQ • Socket.io}

📊 Most Used Languages

📈 GitHub Analytics

🏆 Trophies

📅 Contribution Activity Graph

🌟 Featured Projects

🛡️ agent-loop-guard — AI Agent Safety Library

13 ⭐ • npm: agent-loop-guard-js
Prevents runaway loops, repeated tool calls, uncontrolled execution in AI agents
_{Provider-independent • Zero deps • TypeScript-first • Loop detection}
🛠️ Repo • 📦 npm • ⭐ 13

📦 Published npm Package

Package	Version	Links
agent-loop-guard-js		📦 npm • 🛠️ Repo • 📊 Bundle

📦 Advance Backend Series — 6 Production Systems in 6 Weeks

TypeScript • Redis • BullMQ

Day	System	Key Technologies	Tests
Day 1	Rate Limiter	Token Bucket, Sliding Window, Leaky Bucket, Fixed Window, Sliding Log • Redis	✅
Day 2	JWT Auth	RBAC, Refresh Tokens, Rotation, Blacklisting, bcrypt	✅
Day 3	GraphQL Gateway	Schema Stitching, Redis L1/L2 Cache, Rate Limiting, Auth	✅
Day 4	Notification System	WebSocket + Redis Pub/Sub, Multi-channel, Retry + DLQ	✅
Day 5	Job Queue	BullMQ + Redis, Priority, Retry, DLQ	45 tests ✅
Day 6	Backend System	Service Mesh, Distributed Tracing, Circuit Breakers	🔄

🛠️ View All Day Repos

🌐 Distributed Systems & Infrastructure

Project	Description	Key Tech
🕸️ Distributed Web Crawler	Scalable MERN crawler with distributed queue, politeness policies, rate limiting	MERN, TS, Redis, BullMQ
🗄️ DB Sharding & Replication	Consistent hashing + Range sharding, Single-leader replication, Quorum reads, Vector clocks	JS, Zero deps, node:test
⚙️ Distributed Task Orchestrator	Priority queues, State persistence, Reliable execution	TS, Redis
📦 Job Queue (Day 5)	BullMQ + Redis, Priority queues, Retry with exponential backoff, DLQ	45 tests ✅
☁️ Container Scheduler	Docker orchestration, Resource allocation, Health checks	MERN, TS, Docker

🧠 AI & Specialized Systems

Project	Description	Key Tech
🛡️ agent-loop-guard ⭐ 13	AI agent safety library • Loop detection • Tool call limiting • Zero deps • Published on npm	TS, Zero deps
Multimodal Sentiment Analysis	MinHash LSH deduplication • Customer feedback analysis • Nearest neighbor search	Python, MinHash LSH
AI Code Execution Arena	Sandboxed code execution • Multi-language support • Resource limits	TS, Sandbox

🏗️ Full-Stack Platforms

Project	Description	Key Tech
🐙 GitHub-like Platform	Native Git storage (nodegit) • CI/CD (BullMQ) • Webhooks • Code search • Monaco Editor	MERN, TS, nodegit, BullMQ
🎮 LeetCode Clone	Code execution sandbox • Real-time submissions • Problem management	MERN, TS
🏗️ Advanced System Design MERN	Caching layers • Load balancing • Service mesh	MERN, TS
🏗️ Day 6: Distributed Backend System	Service mesh patterns • Distributed tracing • Circuit breakers	TS, Service Mesh

🔬 Specialized & Research

Project	Description	Key Tech
🗄️ DB Sharding & Replication	Consistent hashing + Range sharding • Single-leader replication • Quorum reads • Vector clocks • Zero deps	JS, node:test
🧠 Multimodal Sentiment Analysis	MinHash LSH deduplication • Customer feedback analysis • Nearest neighbor search	Python, MinHash LSH
🪙 OmCoin ERC-20	Solidity • Hardhat • OpenZeppelin • Ethers.js • Deployed on testnet	Solidity, Hardhat
🛰️ GOD'S EYE	Real-time intelligence dashboard • Flights, vessels, AQI, CCTV, seismic • 24 Indian cities	JS, Real-time APIs

🎓 Currently Working On

+ 🚧 Day 6  →  Distributed Backend System Design        [IN PROGRESS]
+ 🚧 Capstone → Multimodal Sentiment Analysis (MinHash) [WEEK 2 of 12]
+ 🎯 Goal   →  Land a Summer 2026 Backend Internship    [ACTIVELY APPLYING]
+ ✅ Done   →  Day 5 Job Queue (BullMQ, 45 tests)       [DONE]
+ ✅ Done   →  Day 4 Notification System (WS + Redis)   [DONE]
+ ✅ Done   →  Day 3 GraphQL Gateway (Schema Stitching) [DONE]
+ ✅ Done   →  Day 2 JWT Auth (RBAC, Refresh, Rotation) [DONE]
+ ✅ Done   →  Day 1 Rate Limiter (5 algorithms)        [DONE]
+ ✅ Done   →  agent-loop-guard (Published on npm)      [DONE]

🛣️ 2026 Roadmap

Quarter	Goal	Status
Q1 (Jan–Mar)	Master backend basics (Node, DB, API, Redis)	✅ 100%
Q2 (Apr–Jun)	Build 6 production backend systems (Weekly)	🔄 83% (5/6)
Q3 (Jul–Sep)	Capstone + Advanced Distributed Systems	🔄 In Progress
Q4 (Oct–Dec)	Land Summer 2026 Internship + Final Year Project	⏳ Upcoming

🎓 Education & Profile

Detail	Value
Degree	B.Tech Information Technology
Institute	SITRC, Nashik (Savitribai Phule Pune University)
Graduation	2027
Current Year	Final Year (4th Year)
Roll / Group	Roll 70 • Group 37
CGPA	8.5+ (Till Sem 6)

🐛 Open Source Contributions

What kind of contributor am I? I ship root-cause fixes with regression tests to production OSS — not typo patches. Every contribution below was diagnosed from source, verified against the real runtime, and independently reviewed by an AI code reviewer before a human looked at it.

🐛 Karakeep — Highlight Popover Fix

Anchoring a position: fixed popover inside a transformed dialog

A CSS transform makes an element the containing block for position: fixed descendants. Karakeep's preview modal centers its DialogContent with translate-x-[-50%] translate-y-[-50%], so the highlight popover's anchor resolved against the dialog box instead of the viewport — landing the popover directly on the user's text selection.

Root cause — packages/shared-react/lib/highlightPosition.ts Fix — resolve the anchor against its real containing block (getFixedPositionOffsetParent), then convert the selection rect into that ancestor's coordinate space Verification — real Chromium + real Radix Popover primitives; 4/4 geometric assertions Review — an AI reviewer found a second, unfixed call site (the saved-highlight branch); fixed in a follow-up commit with 4 more regression tests

🔍 The Technique I Use

Finding high-signal bugs that maintainers accept:

Scan — read CONTRIBUTING.md / AGENTS.md and the issue tracker for confirmed, reproducible bugs
Root-cause — read the actual source and the dependency internals (e.g. @floating-ui/dom, Radix) until the mechanism is unambiguous
Prove it — write a failing test and a real-browser reproduction before touching the fix
Fix minimally — one root cause, no drive-by refactors, no new dependencies
Verify — typecheck → lint → format → test → frozen-lockfile install → real-browser assertion
Respond — address every reviewer finding in a follow-up commit, not in the PR description

"The best PR is the one where the maintainer's only comment is LGTM."

📊 Contribution Snapshot


Open PRs	14 across 11 repositories
Merged upstream PRs	3 (Sequelize, Temporal TypeScript SDK, The Last Signal)
Combined stars of targeted repos	~820,000
Stars on the largest target	186k (Ollama)

🔗 Open Pull Requests

Repository	Contribution	Stars
Ollama	Fix media ordering in embeddings for multimodal models	186k ⭐
Axios	Cancel the response-stream capability-probe body	109k ⭐
Axios	Prevent `RangeError` when a form field is named `length`	109k ⭐
Axios	Reject a nullish `url` for dispatched requests	109k ⭐
Deno	Reject non-object iterator results in `URLSearchParams`	108k ⭐
TypeScript	Improve the error message for JSX in non-module files	111k ⭐
vLLM	Reclaim encoder compute budget after multimodal pruning	96k ⭐
Bun	Match Node.js `ToIntegerOrInfinity` in `crypto.randomInt`	96k ⭐
Karakeep	Anchor the highlight popover to the selection in the preview modal	30k ⭐
Docker Compose	Extract an `IsPureResourceProvider` helper	38k ⭐
Cua	Persistent connection pooling for `VzApi`	31k ⭐
Moleculer	Per-action and per-service validator overrides	6k ⭐
KafkaJS	`deleteConsumerGroupOffsets` admin API	4k ⭐

_{All contributions use signed-off commits and a linear (rebase) history to satisfy DCO checks.}

🧪 How I verify a fix before opening a PR

A passing unit test tells you very little. For UI and positioning bugs I build a real-browser harness that exercises the actual production code path:

// Legacy behaviour: the anchor is displaced by exactly the dialog origin
[ok] legacy: the anchor is displaced by exactly the dialog origin
[ok] legacy: the REAL Radix popover covers the text selection (the reported bug)
[ok] fixed:  the anchor lands exactly on the selection centre
[ok] fixed:  the REAL Radix popover no longer covers the text selection

The legacy branch is asserted as a bug — so the test proves the bug existed, not just that the new code happens to be self-consistent.

🧭 How I choose which project to contribute to

I score targets on four axes before writing any code:

Signal	Why it matters
Reproducible bug reports	A confirmed bug is already agreed-upon work — no design debate
Merges external PRs	Maintainers who actually review outside contributions
An AI code reviewer is wired in	My PR gets a structured first review before a human sees it
A public `CONTRIBUTING.md` with real rules	The repo wants contributions and states the bar

📝 Contribution checklist I run before every PR

📫 Let's Connect

💬 Random Dev Quote

_{⚡ *\"Learn by building. Ship by shipping. Improve by iterating.\"* ⚡}