Open to opportunities

Guillermo Daniel Salazar

@guillermodanielsalaz

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Lead Smart Contract Engineer with 20+ years in tech and 7+ years in blockchain.

Costa Rica

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What I'm looking for

I seek senior technical roles where I can lead smart contract engineering, mentor teams, drive security-first development, and deliver high-TVL DeFi products.

I am a Lead Smart Contract Engineer with over 20 years in technology and 7+ years focused on blockchain, specializing in designing, implementing, testing, auditing, and deploying secure smart contracts for major DeFi projects.

I have led and mentored cross-functional Web2 and Web3 teams, implemented rigorous testing practices (unit tests, fuzzing, invariant tests), and executed audit processes with top firms, contributing to projects that secured billions in TVL and launched multiple products reaching USD +40MM.

My achievements include building a TypeScript risk framework for Yearn Finance, refactoring 200+ contracts for Tapioca DAO, coordinating multiple audits, and reducing development cycles through agile leadership—delivering secure, gas-optimized, and production-ready smart contract systems.

Experience

Work history, roles, and key accomplishments

Current

Lead Smart Contract Engineer

Current

Kitty Punch

Jan 2024 - Present (2 years 1 month)

Lead the smart contract team designing, testing, auditing, and deploying products on Flow EVM and Abstract, launching 6+ products that reached over $40M TVL and integrating multiple DeFi protocols.

Solidity Foundry EthersJS Invariant Testing CI CD

Senior Smart Contract Engineer

Tapioca DAO

Oct 2024 - May 2025 (7 months)

Refactored 200+ legacy smart contracts, removed 50k lines of code, fixed CI/CD and increased code coverage from ~35% to ~50% via 150+ unit tests and custom libraries to reduce contract size.

Solidity CI CD Unit Testing Refactoring Foundry TypeScript

Senior Smart Contract Engineer

Yearn Finance

Apr 2021 - Jun 2024 (3 years 2 months)

Built and audited secure Solidity contracts with Foundry, led internal security reviews covering $6B+ TVL, and created a TypeScript risk framework tracking 250+ contracts and 30+ third-party integrations.

Solidity Foundry TypeScript Security Reviews Invariant Testing Risk Management

Co-Founder & Engineer

StablePay

Oct 2018 - Aug 2021 (2 years 10 months)

Co-founded StablePay, defined platform architecture, developed 25+ smart contracts with 150+ unit tests, integrated 5 DeFi liquidity providers, and supervised a Quantstamp audit with one high-priority finding.

Solidity Architecture Quantstamp Audits Unit Testing Team Leadership Smart Contracts TDD

Senior Smart Contract Engineer

Polyient Games

Nov 2020 - Apr 2021 (5 months)

Developed governance, NFT, and staking smart contracts for the Polyient Games ecosystem, contributing to $15M+ TVL and mentoring junior developers to improve code quality by 40%.

Solidity NFT Staking Unit Testing Pair Programming TDD

Senior Smart Team Leader

Teller Finance

Mar 2020 - Nov 2020 (8 months)

Led a smart contract team building a lending protocol with 15+ contracts, authored 400+ unit/integration tests, coordinated audits, and deployed the initial protocol on Ethereum mainnet.

Solidity Unit Testing Integration Testing Team Leadership Audit Smart Contracts Ethereum

Smart Contract Engineer

Logosblock

Jan 2019 - Dec 2019 (11 months)

Designed platform architecture integrating 10+ data providers and built 3 PoCs using oracles like Chainlink and Provable to enable on-chain data and backend integrations.

Solidity Oracle Chainlink Architecture Design PoC Development Backend Integrations

Solidity Developer

Pooling Funds Platform

Jul 2018 - Sep 2018 (2 months)

Developed and deployed 15+ smart contracts for a pooling funds platform, implemented TDD with 300+ unit tests achieving ~85% coverage and optimized contracts for 10% gas savings.

Solidity TDD Unit Testing Test Coverage & Security

Co-Founder & Developer

BitsBrackets

Jan 2018 - Sep 2018 (8 months)

Founded BitsBrackets, launched product and roadmap, and developed 10+ smart contracts following security best practices for blockchain, web, and backend components.

Smart Contracts Product Roadmapping Security Best Practices Backend Frontend Team Coordination