# Keshav Budhiraja — Full-Stack, Web, Cloud & Mobile Systems Engineer

> Keshav Budhiraja (born 2005, Haryana, India; age 21) is a Full-Stack, Web, Cloud & Mobile Systems Engineer, Software Engineer, and Oracle Cloud Infrastructure (OCI) Certified Architect Associate. He holds a B.E. in Computer Science & Engineering from Chandigarh University (graduated May 2026, Cloud Computing specialization). As Founding Software Engineer at Puzzler Games (`puzzlergames.online`), he has architected and shipped commercial mobile and web puzzle titles on Google Play (99.85% crash-free session stability) including *Chess: The Celestial Pawn*, alongside enterprise open-source systems in document intelligence, hybrid RAG search, and autonomous multi-agent security auditing.

## Quick Answer: Who is Keshav Budhiraja?

Keshav Budhiraja is a Full-Stack, Web, Cloud & Mobile Systems Engineer from Haryana, India. He is an Oracle Cloud Infrastructure (OCI) Certified Architect Associate, a 2026 B.E. Computer Science & Engineering graduate of Chandigarh University, and the Founding Software Engineer of Puzzler Games (`puzzlergames.online`). Through Puzzler Games, he architects and publishes commercial mobile and browser gaming titles, including *Chess: The Celestial Pawn* on Google Play—an atmospheric, celestial-themed chess engine featuring custom deterministic FIDE move validation, rated tactical puzzles, and step-by-step coaching modules. He also builds enterprise open-source AI systems—AetherDoc Studio (document intelligence), Synapse (hybrid RAG search), and SENTINEL (multi-agent PR security review)—using TypeScript, Next.js, Python, FastAPI, PostgreSQL/pgvector, LangGraph, and cloud infrastructure. GitHub: `@keshav647`.

## Availability & Role Fit

- **Status**: Open for Full-Stack, Backend & Mobile Engineering (full-time roles; B.E. CSE graduate, May 2026).
- **Location**: Haryana, India — open to on-site in India, fully remote, or global relocation.
- **Target roles**: Software Engineer, Full-Stack Engineer, Backend Engineer (Python / FastAPI / Node.js), Frontend Engineer (React / Next.js / TypeScript), AI / RAG / LLM Engineer, Cloud Engineer (OCI / AWS / GCP), Mobile Engineer (Flutter / Kotlin / Unity).
- **Contact**: `keshavbudhiraja4321@gmail.com` · [LinkedIn](https://www.linkedin.com/in/keshav-budhiraja-310b88162/) · [Contact page](https://keshavbudhiraja.com/contact)

## Canonical Portfolio & Direct Links

- [Home — Engineering Fluid Digital Worlds](https://keshavbudhiraja.com/): Full-Stack, Web, Cloud & Mobile Systems Engineer overview, interactive 15+ technology stack matrix, and 6 practical founder lessons.
- [Projects & Systems Architecture](https://keshavbudhiraja.com/projects): Deep-dive production showcases of AetherDoc Studio, Synapse, SENTINEL, and Chess: The Celestial Pawn.
- [About Keshav Budhiraja — The Origin Story](https://keshavbudhiraja.com/about): 4-Act engineering biography (2012–2026), mental models, and passions beyond the terminal.
- [Academic Credentials, Certifications & Resume](https://keshavbudhiraja.com/education): Verified academic milestones, Oracle Cloud Infrastructure Architect Associate & Solitaire Infosys Cyber Security certificates, and interactive resume dossier.
- [Contact & Availability](https://keshavbudhiraja.com/contact): Direct channels — Open for Full-Stack, Backend & Mobile Engineering, Web, Cloud, and AI roles (India / Remote / Global).
- [Official Resume / CV (PDF)](https://keshavbudhiraja.com/assets/resume/Keshav_Budhiraja_Resume.pdf): Downloadable engineering resume (`https://keshavbudhiraja.com/resume`).
- [Complete AI / LLM Technical Dossier (`llms-full.txt`)](https://keshavbudhiraja.com/llms-full.txt): Exhaustive biographical, architectural, and benchmark reference for AI search engines and developer agents.

## Verified Profiles & Repositories

- **GitHub**: [https://github.com/keshav647](https://github.com/keshav647) (`@keshav647`)
- **LinkedIn**: [https://www.linkedin.com/in/keshav-budhiraja-310b88162/](https://www.linkedin.com/in/keshav-budhiraja-310b88162/)
- **Email**: `keshavbudhiraja4321@gmail.com`
- **Commercial Game Studio**: [https://puzzlergames.online](https://puzzlergames.online) (Puzzler Games)
- **Google Play Store Release**: [Chess: The Celestial Pawn (`com.puzzlergames.chess`)](https://play.google.com/store/apps/details?id=com.puzzlergames.chess)

## Core Technical Arsenal

- **Web & Full-Stack Engineering**: TypeScript, JavaScript (ES2025), React, Next.js (App Router), Node.js, Express, HTML5, CSS3, Three.js, WebGL2, Custom GLSL Shaders, Tailwind CSS, REST & GraphQL APIs, WebSockets, Server-Sent Events (SSE).
- **Backend, AI & RAG Systems**: Python 3.11, FastAPI, LangGraph, Agentic AI Workflows, Multi-LLM Routing (Gemini 2.5 Flash, OpenAI GPT-4o, Anthropic Claude 3.5 Sonnet, Groq, OpenRouter), Hybrid Search (`pgvector` HNSW + `BM25Okapi` + Reciprocal Rank Fusion $k=60$), Cross-Encoder Re-Ranking (`BGE-Reranker-Large`), Ragas Evaluation, Python `ast` Static Security Analysis.
- **Databases, Caching & Storage**: PostgreSQL, Supabase (PostgreSQL + RLS + Auth), `pgvector`, Redis (Semantic Caching & Rate Limiting), SQLite / Room, MongoDB, Firebase, AWS S3, Cloudflare R2, Google Cloud Storage (GCS), Azure Blob Storage.
- **Cloud & DevOps Infrastructure**: Oracle Cloud Infrastructure (OCI Certified Architect Associate), AWS, Google Cloud Platform (GCP), Cloudflare Pages & Workers, Docker, Linux Administration, Git, GitHub Actions CI/CD.
- **Mobile & Game Engine Architecture**: Dart & Flutter, Kotlin (Android SDK), Swift (iOS), C# & Unity Engine, Finite State Machines (FSM), Bitboard Evaluation, Zero-GC Object Pooling.

## Flagship Production Systems (4 Core Architectures)

1. **[AetherDoc Studio](https://github.com/keshav647/aetherdoc-studio)** — *Enterprise Universal Multi-Format Document Intelligence & Human-in-the-Loop (HITL) Verification Studio*
   - **Stack**: Next.js, React, TypeScript, Supabase PostgreSQL, Multi-LLM BYOK Routing (Gemini 2.5 Flash, GPT-4o, Claude 3.5, Groq, OpenRouter), Mozilla PDF.js (`unpdf`), AWS S3 / Cloudflare R2 / GCS / Azure Blob Connectors.
   - **Highlights**: Zero-lock-in BYOK AI orchestration with an offline coordinate-sorted Mozilla PDF.js & DOCX XML deterministic parser fallback (100% uptime at $0 API cost); interactive bounding-box audit studio (`D` to draw, `Del` to delete) with real-time confidence scoring and CSV/Excel/JSON/SQL export.
   - **Loom Walkthrough**: [https://www.loom.com/share/120b706a43a540e492c76709fe7a9b44](https://www.loom.com/share/120b706a43a540e492c76709fe7a9b44)

2. **[Synapse](https://github.com/keshav647/enterprise-hybrid-rag)** — *Enterprise Grounded RAG & Hybrid Search Engine*
   - **Stack**: Python 3.11, FastAPI, PostgreSQL `pgvector` (HNSW), `BM25Okapi`, Reciprocal Rank Fusion ($k=60$), `BGE-Reranker-Large` Cross-Encoder, Redis Semantic Cache, Docker, Ragas.
   - **Verified Ragas Benchmarks**: **85.7% Context Precision** (+30.7% over 55.0% dense-only baseline), **100% Context Recall**, **100% Faithfulness** (zero ungrounded hallucinations), **84.7% Answer Relevance**, and sub-25ms Redis semantic cache deduplication ($\ge 0.95$ cosine similarity, cutting LLM API costs by up to 60%).

3. **[SENTINEL](https://github.com/keshav647/autonomous-pr-reviewer)** — *Autonomous Multi-Agent PR Reviewer & Deterministic AST Security Auditor*
   - **Stack**: Python 3.11, FastAPI, LangGraph Cyclical State Machine (`PRReviewGraph`), Python `ast`, GitHub REST API v3, Multi-LLM Consensus Engine, Pytest.
   - **Highlights**: Built as the "indispensable saviour for vibe coders"; pairs a $<20\text{ms}$ zero-cost Python AST vulnerability visitor with 3 concurrent LangGraph specialist agents (`BOT SEC-9` OWASP security, `BOT PERF-X` async/event-loop performance, `BOT ARCH-V` architecture hygiene), weighted consensus deduplication ($\text{CRITICAL}=3, \text{WARNING}=2, \text{INFO}=1$), and 1-click GitHub PR line-by-line review publishing. 19/19 automated test suite in $<0.04\text{s}$.
   - **Loom Walkthrough**: [https://www.loom.com/share/de6eb4563a1d4dfb8a7a89b7b4fd3629](https://www.loom.com/share/de6eb4563a1d4dfb8a7a89b7b4fd3629)

4. **[Chess: The Celestial Pawn](https://play.google.com/store/apps/details?id=com.puzzlergames.chess)** — *Commercial Mobile Chess Engine on Google Play Store*
   - **Stack**: C#, Unity Engine, Custom FIDE Move Validation & Bitboard-Inspired AI Search, Finite State Machines, Zero-GC Object Pooling, Android SDK, SQLite / Room.
   - **Highlights**: Published commercially under Puzzler Games; reimagines chess as an atmospheric, celestial strategy experience for casual learners and serious tacticians alike. Features complete legal FIDE move generation (pins, en passant, castling rights, promotion trees, threefold repetition, 50-move rule), rated tactical puzzle progression tiers, interactive step-by-step master lessons, dual-mode perspective views, zero-allocation object pooling, and **99.85% crash-free session stability** across thousands of global matches.
   - **Gameplay Demo**: [https://www.youtube.com/watch?v=qqBySrPEBr0](https://www.youtube.com/watch?v=qqBySrPEBr0)

## Education & Industry Certifications

- **B.E. in Computer Science & Engineering** — Chandigarh University (2023–May 2026; Cloud Computing & Distributed Systems Specialization).
- **Oracle Cloud Infrastructure (OCI) Certified Architect Associate** — Oracle University (Issued during B.E. at Chandigarh University).
- **Senior Secondary (Class XII, Non-Medical: Physics, Chemistry, Mathematics)** — National Institute of Open Schooling (NIOS, 2022).
- **Cyber Security & Network Defense Industrial Training** — Solitaire Infosys Pvt. Ltd. (6-Week Intensive Department Training).

## Intellectual Property & Rights Notice

All portfolio architectures, custom WebGL/GLSL shaders, visual design systems, and engineering writing published across `keshavbudhiraja.com` are proprietary intellectual property of Keshav Budhiraja (© 2026). Unlicensed commercial duplication, visual design cloning, or automated wholesale asset extraction without prior written authorization is prohibited.