Senior Blockchain Engineer | DeFi | Smart Contracts | Infrastructure

Senior Blockchain Engineer with 7+ years of hands-on experience designing, building, and operating production-grade blockchain systems. Specialized in secure smart contracts, DeFi protocols, and cross-chain architectures across EVM and non-EVM networks.

I focus on security-first smart contract development and reliable blockchain infrastructure.
I have led and contributed to cross-chain NFT and DeFi platforms, including systems that processed seven-figure on-chain volume with high availability and zero critical post-launch incidents.

My experience spans protocol design, audits, optimization, testing, and production operations.

• Contributed to systems securing $100M+ in on-chain value using multi-signature wallets, role-based access control, and hardened deployment practices
• Led smart contract optimization initiatives resulting in ~25% gas reduction on core execution paths
• Delivered production contracts with extensive automated test coverage for financial and permissioned logic
• Built and maintained blockchain platforms supporting high-volume NFT minting and DeFi interactions

Note: Several production projects are private due to client NDAs. Public repositories demonstrate similar architecture and engineering patterns.

Blockchain & Smart Contracts
Solidity, Rust, Hardhat, Foundry, Anchor, Metaplex, OpenZeppelin

Networks
Ethereum, Solana, Polygon, Binance Smart Chain

Backend & Indexing
Node.js, Express, GraphQL, Python, PostgreSQL, The Graph

Frontend (when required)
React, Next.js, Web3.js, Ethers.js

Infrastructure & Tooling
Docker, AWS, GCP, Linux, IPFS, CI/CD

Cross-Chain NFT Platform

• Designed EVM and Solana minting contracts with royalty enforcement
• Implemented cross-chain indexing and metadata pipelines
• Maintained stable production operation under high mint demand
  Tech: Solidity, Anchor, React, Metaplex

Smart Contract Security & Tooling

• Built internal tools for static analysis, invariant testing, and gas profiling
• Applied proven security patterns such as checks-effects-interactions, pull payments, and strict role separation
  Tech: Solidity, Slither, Mythril, Python

Tokenization & On-Chain Accounting Systems

• Implemented transparent asset tracking and lifecycle management on-chain
• Integrated OpenZeppelin standards and upgrade-safe patterns
  Tech: Solidity, Hardhat, OpenZeppelin

• Security before features — financial logic is treated as critical infrastructure
• Prefer composable and auditable contracts over monolithic designs
• Optimize gas only after correctness and test coverage
• Maintain production parity between staging and mainnet
• Favor deterministic deployments and clear documentation

Building secure DeFi protocols, cross-chain infrastructure, and blockchain systems with long-term maintainability and operational reliability.

🌐 Portfolio: https://blockchain-portfolio-pi.vercel.app
💼 LinkedIn: https://linkedin.com/in/sohail-ahmed-b40b66215
📧 Email: sohailahmedlaghari21@gmail.com
🐦 Twitter: https://twitter.com/sohaila6834493

Open to collaboration on DeFi protocols, smart contract security, and blockchain infrastructure.