0xumarkhatab:~$ whoami --status
Security Focused
Senior EVM Engineer
Currently Founding Engineer at ViFi Labs. I am everyday improving DeFi's infrastructure for my own use and for others with measurable quality. I build and learn to break defi protocols to secure them before the bad actors.
The Build (Engineering)
160+ smart contracts shipped across Fx on-chain, RiftLend, Multisig Bridges, and Non-Custodial Wallets
The Break (Security)
Multiple High severity bugs in Contests. Occasionally hunt bugs.
The Logic (Writing)
Explaining EVM Bytecode, Uniswap V4 Hooks, and DEX design mechanics.
0x01 Active Build Ledger
ViFi Labs (FX On-chain)
BUILDINGLeading the EVM implementation for a Virtual Fiat Environment. Converting USD-pegged assets into synthetic local currencies for instant cross-border settlement.
- > Python Simulations → Foundry Implementation
- > Modular + Gas-Efficient Contract Design
0x02 Security Research Ledger
| Target | Severity | Finding | Link |
|---|---|---|---|
| ZeroLend | HIGH | Governance bricked for whitelisted users | Report ↗ |
| ZeroLend | MEDIUM | Unlimited minting of governance NFTs | Report ↗ |
Sherlock Portfolio ↗
0x03 Deployment Ledger
Riftlend: Multichain Lending
Unified interest rates across all chains for stress-free lending.
Multisig Swap Bridge
Cross-chain burn/mint logic with multiple signature verification.
Uniswap V4 Hook (Assembly/Huff)
Building on-chain hooks with assembly-level explanations.
Core Infrastructure & Tooling
DeFi Infrastructure
Lending protocols (Riftlend), AMMs, and Staking.
Cross-Chain Systems
Multisig Swap Bridges and Native Token Bridging.
Low-Level / Huff
Gas optimization, EVM Opcodes, and Assembly.
Web3 Engineering
Non-custodial wallets and Full-stack integration.
0x04 Writing Ledger
Technical Deep Dives
DEFI_RESEARCH
InstaDapp Fluid Deep Dive
EVM_BYTECODE
How DUP Opcodes Work
ARCHITECTURE
MEV-Resistant DEX Design
Check more on github ↗
0x05 Employments Ledger
Founding EVM Blockchain Engineer
Jun 2025 — PresentViFi Labs • Full-time
- - Architecting a novel liquidity layer for emerging FX markets on-chain, enabling high-volume trades with minimal slippage.
- - Building core smart contracts from scratch in Solidity and deploying across multiple EVM chains.
- - Developing high-efficiency frontends to interact with decentralized liquidity protocols.
Senior Smart Contracts Engineer
Dec 2024 — Apr 2025RiftLend • Part-time
- - Architected next-generation lending and borrowing across EVM chains using Aave V2’s battle-tested codebase.
- - Designed 20+ core smart contracts using Foundry, following strict industry standards.
- - Successfully deployed to 5+ chains while integrating with frontends for a seamless user experience.
Senior Blockchain Engineer
Feb 2024 — Dec 2024NextKore Ltd. • Full-time
- - Engineered Slot Collider, a modern storage slot collision detector for smart contract pairs.
- - Built a deep storage audit tool capable of extracting storage variable data, reducing upgrade time by 90%.
Blockchain Engineer
Feb 2023 — Mar 2024Astra Nova • Part-time
- - Crafted the entire Deviants NFT collection, reaching a TVL of approximately $1M.
- - Developed and launched the $RVV token with a MarketCap of ~$4.6M.
- - Led the smart contract launch for Deviants on the Ethereum Mainnet.
Blockchain Solution Architect
Mar 2023 — Feb 2024Cherry Byte Technologies • Full-time
Analyzed and launched complex products across NFTs, DeFi, and Crypto Wallets on Ethereum, Polygon, Cardano, and XRP landscapes.
Co-Founder
Sep 2022 — Jan 2024Rentweb3 • Self-employed
Built a renting protocol for NFTs and Dapps using the ERC-4907 standard, allowing artists to launch rentable collections.
Blockchain Engineer
Jan 2022 — Oct 2022SocialB.Digital • Full-time
Led a development team in building decentralized applications across Ethereum and Tron ecosystems.
0x05 Certifications
Node Guardians Campaigns
Node Guardians - Unveiling Huff Campaign
VerifyHuff is a low-level language tailored for writing absurdly optimized EVM code. As the journey unfolds, i cam face to face with the inner workings of the EVM and harnessed the power of Huff to write some crazily optimized contracts i.e Writing Bit reversal algorithm wih only 900 gas which would have taken 4000-10000 gas in soldity.
Cyfrin Updraft Specialized Tracks
Aave V3 Protocol Development
VerifyDeep-dive into Aave V3 architecture, lending pools, and flash loan mechanics i.e Reserves, ATokens, debt tokens,Reserve factors, liquidation pricing, credit delegation, LTV
Advanced Web3 Wallet Security
VerifyLearnt Advanced transaction verification techniques , Set up and configuration of a Safe wallet multi-sig,EIP-712 structured data signatures and verification tools, decoding and verify complex transactions and became familiar with utils like Cyfrin Safe Hash,Safe TX Hashes Util OpenZeppelin Safe Utils.
Advanced Foundry
VerifyMastered web3 development techniques with Advanced Foundry for Solidity smart contract development. Learn to write, deploy, test, optimize, and interact with the smart contracts using industry-standard tools. Lessons learnt by the top smart contract engineers in web3.
Curve CryptoSwap
VerifyLearnt the second generation of Curve Smart contracts containing AMM and math, curves, liquidity pools, swaps, and more. Learned Stableswap tricrypto AMM math , internal price oracle amd understand the liquidity concentration mechanics
Curve StableSwap
VerifyLearnt how Curve finance V1 works, AMM and math, curves, liquidity pools, swaps, and more. Learned Stableswap AMM math , flatness control of the stableswap curve and to implement and understand the liquidity mechanics.
Formal Education
Bachelor in Computer Science
AcademicFAST NUCES Lahore. Rigorous engineering background with a focus on Operating Systems, X86 Architecture, and Information Security.