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Pavel Espitia J

@pavelespitiaj

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Senior Smart Contract Engineer and AI security builder, shipping audited Web3 protocols.

Colombia

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What I'm looking for

I’m looking for a senior role where I can harden Web3 protocols and build AI security products—working in teams that value independent audits, deep testing rigor, and shipping production systems that stand up in the real world.

I’m a Senior Smart Contract Engineer focused on building and hardening Web3 protocols for production use. Over the past 18 years, I’ve shipped software systems end-to-end, with the last 8 years centered on Web3 architecture and security.

The contracts and systems I’ve architected have undergone independent audits by firms including STATEMIND (audits of Lido, Curve and Yearn), QuillAudits, and storming0x. I build with rigorous verification in mind—test-case reviews, release readiness, and audit preparation are part of how I operate.

I also build AI systems that ship in real products: agents, MCP servers, and LLM-powered security products. My work includes AI transaction firewall ideas for crypto wallets and tools like an AI smart contract auditor (Solidity + Vyper) and multi-chain contract chat.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer (Contract)

Current

MILL5

Nov 2023 - Present (2 years 8 months)

Provided requirement and test-case reviews, defect triage, requirements traceability, and release readiness for a US-based regulated medical-device product in a distributed team.

Defect Triage Distributed Teams

Current

Independent Contract Engineer

Current

Independent

Jun 2023 - Present (3 years 1 month)

Independent contract engineering for US clients focused on Web3 security and architecture, including audited smart contracts. Builds AI systems such as agents and MCP servers that can hold wallets and transact, and works on blockchain-based systems like medical claims and RWA tokenization.

Web3 Security Contract Architecture Smart Contract Auditing Ethereum Solidity TypeScript Hardhat Foundry AI Agents MCP Servers LLM Security Products EIP 712 Signatures Cross Chain Replay Protection RWA Tokenization

Blockchain Developer

FIWORK

Jun 2021 - Jun 2023 (2 years)

Designed Solidity smart contract architectures and cryptographic primitives, supported dApp integration using viem/ethers, and helped with audit preparation and testing infrastructure for Web3 products.

Solidity Cryptographic Primitives Contract Architecture Viem Ethers Audit Preparation Testing Infrastructure

Senior Software Developer

MILL5

Feb 2020 - Jun 2021 (1 year 4 months)

Built full-stack solutions using TypeScript, Node.js, and .NET, working on distributed systems for US enterprise clients.

Full Stack TypeScript Node .NET Distributed Systems

Senior Frontend Developer

PSL Corp

Feb 2019 - Feb 2020 (1 year)

Developed React and TypeScript frontend architecture for financial services, healthcare, and SaaS clients, including Xtiva and SEON (Safe Fleet).

React TypeScript Frontend Architecture

Frontend & Blockchain Developer

Blocksize

Sep 2018 - Feb 2019 (5 months)

Worked on eFIN DEX for TokenPay, building a non-custodial exchange with atomic swaps (BTC/LTC/ETH) routed over Tor. Also contributed to wallet UX, smart-contract integration, and cryptographic primitives.

Atomic Swap Non Custodial DEX Wallet UX Cryptographic Primitives Bitcoin Litecoin and Ethereum