Leonard Sambu

Leonard Sambu

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Technical Arsenal

Comprehensive skillset spanning offensive security, blockchain architecture, and full-stack development.

🛡️

Security & Auditing

Smart Contract Auditing Vulnerability Research Penetration Testing CORS/CSRF IDOR/BOLA XSS (Stored/Blind) SQLi & SSRF Digital Forensics
🔗

Blockchain & Web3

Solidity Foundry Hardhat Slither Mythril Echidna EVM Internals ERC-4626
🧠

AI & LLMs

Claude (Sonnet 3.5, 4.6) Groq API Gemini MCP Agentic AI Prompt Engineering Deepseek
💻

Fullstack & Tools

JavaScript TypeScript Python React.js & Next.js Node.js Cloudflare Docker CI/CD

Independent Security Research

Proven track record of discovering and disclosing high-severity vulnerabilities across both traditional Web2 and Web3 platforms.

21
Submissions
15+
Targets
2
Platforms

Platform Experience

H

HackenProof

Bug Bounty Platform
NAVI Protocol Volo DeFi Hub Toobit Bitkub
O

OKX

Global Exchange
Web Mobile Desktop Extensions
H1

HackerOne

Bug Bounty Platform
Demorgen Media Targets

Methodology & Research

Rewarded Bounty

High-Severity IDOR Discovery

Identified and exploited an Insecure Direct Object Reference vulnerability where sequential numeric identifiers allowed unauthenticated manipulation and deletion of other users' addresses, demonstrating a complete breakdown of server-side authorization checks.

Critical Impact

Blind Stored XSS to PII Leak

Successfully injected a Blind XSS payload into a public registration form that later executed within an internal, authenticated backoffice dashboard, leading to the unauthorized disclosure of highly sensitive user PII (National IDs, Phone Numbers).

40+
Protocols Audited
10+
High/Critical Findings

Conduct independent security audits of smart contracts across leading DeFi protocols including Frax, GMX, PancakeSwap, and Morpho. Develop comprehensive proof-of-concept exploits using Foundry with mainnet-fork verification to demonstrate real-world impact.

S

Vulnerability Discovery

Smart Contract Exploits
sfrxETH underflow Signature Bypasses Reentrancy Vault Manipulation
A

Audited Ecosystems

DeFi Protocols
Frax GMX PancakeSwap Morpho KINZA

c0bw3b Toolkit

A custom-built automated reconnaissance and vulnerability scanning pipeline powering my bug bounty operations.

Automated Recon & Exploitation

The c0bw3b toolkit automates the tedious aspects of bug hunting, chaining together customized modules for deep reconnaissance and vulnerability detection across massive attack surfaces.

  • Comprehensive JavaScript secret analysis and extraction
  • Integrated Nuclei scanning with custom templates
  • Asynchronous port scanning and service fingerprinting
  • Passive and active subdomain enumeration
  • Cloud service takeover detection
  • Historical URL collection (Wayback, CommonCrawl)
  • Automated detection of CORS, IDOR, SQLi, and SSRF
  • False positive verification and attack chain detection
c0bw3b-pipeline
c0bw3b@local:~$ ./c0bw3b run --target example.com
[INFO] Starting reconnaissance pipeline...
[+] Module js_analyzer initialized
[✔] Found 3 exposed API keys
[+] Module nuclei_runner scanning endpoints
[+] Module port_scanner analyzing 80 common ports
[✔] Discovered 4 open ports
[+] Module url_collector fetching history
... retrieved 5,030 URLs
[INFO] Initiating vulnerability modules
[!] Potential High-Severity IDOR detected
[!] Validating SSRF candidate on /api/proxy
c0bw3b@local:~$ _

Key Projects

Fullstack applications bridging Web3, Artificial Intelligence, and advanced automation.

CVEScan

Professional vulnerability scanner orchestrating AI agents (Gemini) and tools (Bandit, Semgrep) for real-time CVE monitoring and automated report generation.

AI AgentsGeminiSemgrep

Uplift

A production-ready good news aggregation platform built with React, TypeScript, and Cloudflare Workers for real-time curation.

ReactCloudflareTypeScript

Curated Feed

Digital autonomy engine integrating Groq API (Llama 3.3 70B) for real-time curation and high-performance KV storage.

Groq APILlama 3.3KV Storage

BotIn

Decentralized AI agent professional network utilizing ERC-8004 for agentic identities and XMTP messaging.

ERC-8004XMTPWeb3

NimbusTrade

Web3 arbitrage dashboard combining Polymarket CLOB APIs and Gemini-powered Expected Value logic.

PolymarketGemini AI

KinSync

Next-of-Kin digital estate vault smart contract on Base, automating decentralized IPFS content authorization.

BaseIPFSSmart Contracts

FinPro

High-performance financial platform integrating Next.js, Supabase, and automated Playwright test suites.

Next.jsSupabasePlaywright

Professional Experience

Leadership and technical roles across technology, media, and education.

Technology Consultant & Developer

Self-Employed Sep 2023 - Present
  • Engineered and audited Solidity smart contracts using static analysis tools (Slither, Mythril); reduced exploit risk surface by 40%.
  • Architected real-time data pipelines integrating Meta Lead Ads with CRM using Cloudflare Workers.
  • Built fullstack solutions integrating React.js, Next.js, Node.js, and IPFS; prototyped DeFi lending platforms.

Project Manager

SIZLAND Limited Nov 2025 - Mar 2026
  • Orchestrated Agile and Scrum workflows in a Web3 environment via JIRA and Trello.
  • Partnered with QA teams to rigorously validate deliverables, ensuring technical excellence.

Indie Game Developer

Jampack Incubator Feb 2026
  • Developed Mathlantis, an educational web app for Games for Love.
  • Honored with the "Most Child Friendly Game" title badge.

Director and Manager

Sambu Academy Aug 2022 - Present
  • Directed educator teams and implemented SOPs that boosted productivity by 30%.

Technical Director & Firm Manager

KASS Media Feb 2019 - Apr 2023
  • Led technical operations, logistics, and firm management over a multi-year tenure.

Professional & Technical Certifications

In Progress
CompTIA Cloud+ (CV0-003) Specialization
Coursera
View
Full Stack Web3 Development Crash Course
Cyfrin Updraft
View
Solidity Smart Contract Development
Cyfrin Updraft
View
Smart Contract Security
Cyfrin Updraft
View
Cybersecurity Awareness and Innovation
EIT Digital / Coursera
View
Develop a Company Website with Wix
Coursera Project Network
View
Leveraging VAs for Personal Productivity
Coursera Instructor Network
View
Learn HTML Course
Course Completion Certificate

Security & Defense Training

View
Cybersecurity Awareness
DCSA / CDSE
View
Establishing an Insider Threat Program
DCSA
View
Insider Threat Awareness
DCSA
View
Maximizing Organizational Trust
DCSA

Personal Development, Soft Skills & Extracurriculars

View
Non-Technical Life Skills
Course Completion Certificate
View
Guitar Knowledge Level 1
Yousician Certificate
View
Great Learning Verification Portal
Great Learning Verification Link

Education

CompTIA Cloud+ (CV0-003) Specialization

Coursera In Progress

B.A. International Relations & Diplomacy with I.T.

Maseno University 2008 -

Certificate in HTML Web Language

Star College 2008

Kenya Certificate of Secondary Education

Milimani High School 2006 - 2007