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I am Shashank Kesarwani, I am an Application Security Engineer at Poppulo and have 3+ years of Experience in Security and Development. Below are the services which I can provide:- Services: 🔍 Risk Assessment: Uncover hidden threats before they strike! I deliver thorough evaluations that proactively identify risks and provide strategic solutions to keep your business secure. 🔐 Vulnerability Assessments: Stay ahead of cyber threats with detailed vulnerability scans. I’ll pinpoint weaknesses in your infrastructure and provide actionable steps to fortify your defenses. 🎯 Penetration Testing: Think your system is secure? Let me put it to the test. I conduct rigorous penetration testing to expose vulnerabilities before attackers can exploit them. 🧩 Code Review: Ensure your code is rock-solid. I offer meticulous code reviews to identify and eliminate security vulnerabilities, ensuring your software is both robust and secure. 💻 Script Writing: Automate and optimize your operations with custom scripts. I craft versatile scripts tailored to your needs, with proficiency in Python, Java, and Bash. 📜 Compliance Consulting: Navigating compliance standards can be tricky—I make it simple. Whether it’s ISO 27001, PCI DSS, or NIST, I’ll guide you through achieving and maintaining compliance with ease. 🚀 Cybersecurity Mentor: Ready to elevate your cybersecurity career? I provide personalized mentorship, offering guidance and support to help you thrive in this ever-evolving field. Why Choose Me: With a proven track record of significantly reducing security risks and boosting system defences, I am dedicated to providing high-quality cybersecurity services tailored to your unique needs. My strong analytical, communicative, and leadership skills ensure effective collaboration and successful project outcomes. Let’s work together to secure your digital assets and achieve your cybersecurity goals. Let's connect and discuss how I can help protect your organization from cyber threats!

Experienced Blockchain Developer with a demonstrated history of working in the information technology and services industry. Skilled in ethereum, hyperledger,smart contract, C++, RPC, Go, and Wallets. Strong engineering professional with a Cyber Security focused in masters of engineering

Need an AI/LLM application pentested before launch? I'm a CREST-registered, OSCP-certified penetration tester currently doing product security at HackerOne. In the last 7 years I've found vulnerabilities reported in the Hall of Fame at SkyScanner, Under Armour, Western Union, Binance, and Intel. AI/ML Security Specialist & Senior Penetration Tester | OSCP • CREST CRT • CREST CPSA • ISC2 CC • ISO 27001 LA | 7+ Years | Currently Product Security @ HackerOne I help AI startups and SaaS companies ship products that don't get breached. My focus: securing LLM applications, MCP servers, agentic systems, and the REST/GraphQL APIs that power them — using the same offensive playbook that earned me Hall of Fame recognition from SkyScanner, Under Armour, Redox, Western Union, Indeed, Binance, and Intel. ━━━━━━━━━━━━━━━━━━━━━━ AI / ML SECURITY (PRIMARY) ━━━━━━━━━━━━━━━━━━━━━━ ✅ LLM Vulnerability Assessments aligned with OWASP Top 10 for LLM Applications (2025) — prompt injection, sensitive info disclosure, supply-chain, data/model poisoning, improper output handling, excessive agency, system prompt leakage, vector/embedding flaws, misinformation, unbounded consumption ✅ AI Red Teaming using PyRIT, Garak, DeepTeam, PentAGI, Strix — single-turn + multi-turn jailbreaks, indirect injection, tool-poisoning, RAG poisoning ✅ Model Context Protocol (MCP) Security — auditing MCP servers/clients for tool poisoning, OAuth/token theft, command-injection (CVE-2025-6514, CVE-2025-49596 class issues), capability-confusion, and STDIO RCE patterns ✅ Threat Modeling for Generative AI mapped to MITRE ATLAS + NIST AI RMF + OWASP Agentic AI Top 10 (Dec 2025) ✅ MLSecOps & AI Security in CI/CD — automated red-team pipelines via N8N, Nuclei, ars0n framework, OWASP Nettacker, integrated into GitHub Actions/GitLab/Jenkins so every model + prompt change is tested before merge ━━━━━━━━━━━━━━━━━━━━━━ TRADITIONAL VAPT (SECONDARY) ━━━━━━━━━━━━━━━━━━━━━━ ✅ Web App & API Penetration Testing — Django, FastAPI, NestJS, REST, GraphQL with Burp Suite Pro ✅ OWASP Top 10:2025 + OWASP API Top 10 — IDOR, SSRF, auth bypass, business-logic flaws, mass assignment, JWT/session attacks ✅ Mobile (Android/iOS), Network (internal/external), Cloud (AWS/Azure/GCP) pentesting ✅ Smart Contract Security Audits — Solidity, common DeFi attack patterns ✅ DevSecOps — SAST/DAST integration, WAF tuning, secure-SDLC consultation ━━━━━━━━━━━━━━━━━━━━━━ PROOF OF WORK ━━━━━━━━━━━━━━━━━━━━━━ - Hall of Fame: SkyScanner, Under Armour, Redox, Western Union, Indeed, Binance, Intel - Currently: Product Security Analyst @ HackerOne (the world's largest bug-bounty platform) - Active: Lead AI Product Security freelancer for a US-based AI startup building agentic LLM tooling - Certs: OSCP (offensive security), CREST CRT (UK gold-standard pentest), CREST CPSA, ISC2 CC, ISO 27001 LA ━━━━━━━━━━━━━━━━━━━━━━ WHAT YOU GET ━━━━━━━━━━━━━━━━━━━━━━ 1. A scoping call within 24 hours under NDA 2. Hybrid manual + automated testing (zero scanner-only "100-page PDF" reports) 3. Executive summary + technical findings, each with reproduction steps, CVSS, business impact, and developer-friendly remediation 4. Mapping to your compliance frameworks: SOC 2, ISO 27001, HIPAA, PCI-DSS, EU AI Act, NIST AI RMF 5. Free remediation re-test within 30 days — every finding re-validated until closure ━━━━━━━━━━━━━━━━━━━━━━ IDEAL CLIENTS ━━━━━━━━━━━━━━━━━━━━━━ 🚀 AI/ML startups shipping LLM apps, RAG systems, MCP servers, or agentic workflows that need a real adversary before launch or before SOC 2 🌐 SaaS / fintech / healthtech teams needing OWASP-aligned web + API VAPT with a clean, auditor-ready report If you're building with GPT-4o, Claude, Llama, Gemini, custom fine-tunes, LangChain, LangGraph, CrewAI, AutoGen, or MCP — and you need someone who actually breaks things instead of running a scanner — let's talk. 📩 Send your scope (and ideally a 1-line description of the LLM/agent stack). You'll get a tailored test plan within 24 hours. Keywords: AI Security, LLM Security, AI Red Teaming, AI Penetration Testing, GenAI Security, Prompt Injection Testing, Jailbreak Testing, MCP Security, Model Context Protocol Audit, MLSecOps, OWASP LLM Top 10, NIST AI RMF, MITRE ATLAS, Agentic AI Security, RAG Security, Vector Database Security, Penetration Testing, VAPT, Web Application Penetration Testing, API Penetration Testing, REST API Security, GraphQL Security, Burp Suite Pro, OWASP Top 10, Mobile Pentest, Cloud Security AWS Azure GCP, Smart Contract Audit, DevSecOps, SAST DAST, OSCP, CREST CRT.

𝐒𝐞𝐧𝐢𝐨𝐫 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭 | 𝐒𝐦𝐚𝐫𝐭 𝐂𝐨𝐧𝐭𝐫𝐚𝐜𝐭 𝐒𝐞𝐜𝐮𝐫𝐢𝐭𝐲 𝐑𝐞𝐬𝐞𝐚𝐫𝐜𝐡𝐞𝐫 | 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐖𝐞𝐛𝟑 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 Web3 Security Expert | High-Performance Backend Architect | Top-Rated Developer | 100% Commitment to Protocol Safety 👨‍💻 𝐀𝐛𝐨𝐮𝐭 𝐌𝐞 I am a Senior Blockchain Engineer and Web3 Security Researcher with 3+ years of experience specializing in architecting high-performance, fault-tolerant decentralized systems. I bridge the gap between secure on-chain logic and institutional-grade backend infrastructure. I don’t just write smart contracts—I engineer systems for peak performance and military-grade security. Whether it is auditing high-value DeFi protocols or architecting microservices for NatWest Group, my work translates to measurable improvements in system safety, gas efficiency, and throughput. ➡ 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐇𝐢𝐫𝐞 𝐌𝐞 • Proven Security Track Record: Identified 20+ critical vulnerabilities in production-grade protocols. Ranked Weekly #347 on Code4rena and #856 on Sherlock global leaderboards. • Institutional-Grade Engineering: Currently architecting microservices from scratch at NatWest Group, owning the complete lifecycle from design to cloud deployment. • Gas & Performance Mastery: Engineered gas optimizations that reduced execution costs by up to 60%. Boosted backend system throughput by 200% using advanced concurrency models. • Academic & Research Authority: IEEE-published author on blockchain architecture, achieving a 100x faster resolution time compared to traditional systems. • Mainnet Success: Successfully launched Middle Earth AI on Solana Mainnet, securing over $100K in TVL with 500+ active players. ➡ 𝐌𝐲 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 1️⃣ Smart Contract Auditing & Security Analysis Comprehensive audits for Solidity and Rust (Anchor) codebases. I identify reentrancy, complex logic errors, and economic exploits using Foundry, Hardhat, and custom fuzzing suites. 2️⃣ DeFi & Web3 Protocol Development End-to-end architecture for token issuance, staking vaults (ERC-4626), reward distribution, and Merkle-based airdrops. Expert in gas-optimized DeFi primitives and account abstraction (ERC-4337). 3️⃣ High-Performance Backend & API Engineering Building resilient microservices using Python (FastAPI) and Go to bridge off-chain workflows with on-chain data. Specializing in high-volume data ingestion and 3x API latency reduction. 4️⃣ Full-Stack DApp Integration Seamless integration of secure contracts with responsive React/Next.js frontends using Ethers.js and Web3.js for a cohesive user experience. ➡ 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 🧠 𝐀𝐈 & 𝐀𝐠𝐞𝐧𝐭𝐢𝐜 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: • LLMs & Interfaces: Gemini 1.5 Pro, ChatGPT (GPT-4o), Claude 3.5 Sonnet, OpenRouter. • Agentic Tools: AntiGravity, OpenClaw, LangChain, LlamaIndex, AutoGPT. • AI Dev Environment: Cursor, GitHub Copilot, Ghostwriter. • AI Infrastructure: Vector Databases (Pinecone, Weaviate, Milvus), OpenAI API, Anthropic API. ⚙️ 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 & 𝐒𝐲𝐬𝐭𝐞𝐦𝐬: • Languages: Solidity, Yul, Rust, Python, Go, Java, SQL, C++, TypeScript. • Frameworks: FastAPI, Django, Flask, Spring Boot, gRPC, Protobuf, Node.js. • Performance: Celery, Redis, RabbitMQ, Kafka, Multithreading/Concurrency. ⛓️ 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 & 𝐒𝐞𝐜𝐮𝐫𝐢𝐭𝐲: • Security Tools: Foundry, Hardhat, Slither, Echidna, Mythril, Surya, SolidityScan, Manticore. • Frameworks & Libraries: Anchor (Solana), OpenZeppelin, Ethers.js, Web3.js, Web3.py, Tenderly. • Standards: ERC-20, ERC-721, ERC-1155, ERC-4626 (Vaults), ERC-4337 (AA), ERC-6551. 🌐 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 & 𝐔𝐈: • React.js, Next.js, Redux, Tailwind CSS, Shadcn/UI, Framer Motion, Three.js. 📊 𝐃𝐚𝐭𝐚, 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬: • Databases: PostgreSQL, MongoDB, MySQL, OracleDB, Cassandra, Elasticsearch. • Infrastructure: Docker, Kubernetes, Terraform, Ansible, CI/CD (GitHub Actions, Jenkins). • Cloud Platforms: Google Cloud (GCP), AWS, Azure, Vercel, Render. 𝐘𝐨𝐮𝐫 𝐩𝐫𝐨𝐭𝐨𝐜𝐨𝐥 𝐝𝐨𝐞𝐬𝐧’𝐭 𝐣𝐮𝐬𝐭 𝐧𝐞𝐞𝐝 𝐭𝐨 𝐰𝐨𝐫𝐤—𝐢𝐭 𝐧𝐞𝐞𝐝𝐬 𝐭𝐨 𝐛𝐞 𝐢𝐧𝐯𝐮𝐥𝐧𝐞𝐫𝐚𝐛𝐥𝐞. Let's schedule a quick 10-minute strategy call to discuss your technical roadmap and how I can help you achieve a secure, gas-efficient, and production-ready application. 🔑 Keywords Blockchain Developer | Senior Blockchain Engineer | Smart Contract Auditor | Web3 Security Researcher | Solidity Expert | Rust Anchor Developer | DeFi Architect | Smart Contract Security | Ethereum Developer | Solana Developer | FastAPI Developer | Backend Architect | Gas Optimization Expert | ERC-4626 | Account Abstraction | Code4rena Auditor | Sherlock Auditor | Microservices Engineer | System Design Expert | Performance Tuning

Professional Summary I am a technology consultant specializing in Quantum Computing, Artificial Intelligence (AI), Blockchain, IoT, Full-Stack Development, and DevOps services. I focus on providing practical solutions to complex challenges, enabling businesses to innovate and streamline operations. Key Services Offered: Quantum Computing Solutions: • Developing quantum algorithms for finance, optimization, and materials science. • Researching and implementing quantum machine learning models for data analysis. • Simulating and deploying quantum systems to optimize workflows and predict outcomes. Artificial Intelligence and Machine Learning: • Designing AI-driven applications, including NLP tools using large language models (LLMs). • Building machine learning models for predictive analytics and anomaly detection. • Creating AI frameworks for automation, decision-making, and recommendation systems. Blockchain and IoT Development: • Developing blockchain applications for secure, scalable solutions in various industries. • Designing smart contracts for workflow automation and transparency. • Implementing IoT solutions integrated with blockchain for secure data handling. Full-Stack Development and DevOps Services: • Building modern web and software applications with a focus on user experience and functionality. • Providing end-to-end development services, from frontend and backend to database design. • Offering DevOps solutions, including CI/CD pipelines, cloud deployments, and Kubernetes-based scaling. Educational Background: • Ph.D. in Physics – Specialization in Quantum Information & Optics. • Postgraduate Certification – Fundamentals of Blockchain Technology. • Master’s and Bachelor’s Degrees – Physics with a focus on Theoretical Physics. Notable Projects: Quantum and AI Projects: • Developing portfolio optimization algorithms using quantum and classical methods. • Designing anomaly detection systems with Isolation Forest and LSTM models. • Simulating quantum key distribution protocols for secure communication. Blockchain and Web Development: • Designing decentralized applications (dApps) with advanced smart contract functionalities. • Developing scalable web applications for industries like e-commerce, education, and finance. • Implementing DevOps pipelines and cloud-based deployment strategies for efficient operations. Why Choose My Services? • Diverse Expertise: Proficiency across Quantum Computing, AI, Blockchain, IoT, and Full-Stack Development. • Tailored Solutions: Custom-designed applications and algorithms to meet your business objectives. • Comprehensive Support: End-to-end services from ideation to deployment and maintenance. I am dedicated to helping businesses leverage advanced technologies to achieve their goals. Let’s collaborate to create impactful solutions tailored to your needs. For more details and to discuss your project send an invitation to my profile.

Hello, I am a cryptography expert with 15 years of teaching experience and a strong background in Python development. My expertise lies in both teaching and developing cryptography concepts using Python.