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Rangel Stoilov

@rangelstoilov

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AI/Smart Contract Engineer at Vexity, building DeFi strategy contracts and AI evaluations for on-chain automation.

Bulgaria

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At Vexity, I develop smart contracts for a noncustodial DeFi automation protocol and create AI evaluations to check user intents and the Weiroll scripts they produce. I also built a Rust simulation engine for testing strategies against a forked network.

At Euler Labs, I improved backend page loads from five seconds to under 200 milliseconds and scaled backend capacity 5x. I also worked on smart contract verification, Euler Swap, and transaction-batching flows.

Experience

Work history, roles, and key accomplishments

Current

AI/Smart Contract Engineer

Current

Vexity

Feb 2026 - Present (9 months)

Developed smart contracts for a noncustodial DeFi automation protocol. Created AI evaluations and a simulation engine to test strategies, and maintained AI coding harness workflows.

Solidity TypeScript Rust OpenRouter Lang Chain Claude Code Harness Development AI Agents CI Pipelines Code Quality Agentic AI Testing Automation

Backend Tech Lead

Euler Labs

Jul 2022 - Feb 2026 (3 years 7 months)

Led backend and DevOps restructuring to scale capacity 5x, improved smart contract security with Certora formal verification, and built indexing systems that improved page load time from 5 seconds to under 200 milliseconds. Managed infrastructure budget and optimized costs by 500%.

AWS Docker GitHub Actions PostgreSQL TypeScript Solidity Certora Git Flow Fintech DevOps System Architecture Backend Services Observability Monitoring Test Driven Development

Senior Blockchain Engineer

Euler Labs

Feb 2022 - Jul 2022 (5 months)

Improved application architecture and integrated backend services, increasing development output by 300%. Maintained Euler's Next.js frontend and used test-driven development to write highly testable code.

NodeJS PostgreSQL React Solidity TypeScript Test Driven Development

Udemy Instructor on Web Development

Udemy

Oct 2018 - Mar 2022 (3 years 5 months)

Taught web development and blockchain topics to a global audience, achieving 57,000+ enrolled students with a 4.5-star average rating. Helped 15,000+ students learn Solidity, smart contracts, and Truffle.

GraphQL React Solidity WordPress

Senior Frontend Developer

DappRadar

May 2021 - Feb 2022 (9 months)

Created and maintained the Token Swap feature, introduced token airdrop and claiming flows, and built global web3 wallet connection across products. Added OpenSea SDK support for NFT buying and selling.

JavaScript React Solidity TypeScript Web3 OpenSea

Senior Blockchain Engineer

DappRadar

May 2021 - Feb 2022 (9 months)

Worked on the world's dapp store, contributing to blockchain engineering efforts. Stack included JavaScript, React, Solidity, and TypeScript.

JavaScript React Solidity TypeScript

Blockchain Engineer

AdEx Network

Aug 2019 - May 2021 (1 year 9 months)

Worked on an open-source, transparent, and fraud-proof display advertising network. Stack included Docker, JavaScript, and Solidity.

Docker JavaScript Solidity

Front End Developer

AdEx Network

Aug 2019 - May 2021 (1 year 9 months)

Expanded platform and website front end features, applied analytics and UX flows, migrated the website to Gatsby.js, and built a market-making automation system. Dockerized internal applications and supported server deployments.

JavaScript Gatsby Docker CMS Discord Bots Version Control

Software Developer

Eltrade

Oct 2017 - Mar 2018 (5 months)

Developed an internal human resources management system in under 20 days using C# ASP.NET MVC and JavaScript. Built internal systems for fingerprint authentication and employee vacation management.

C#ASP.NET MVC JavaScript