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Blockchain software engineer with nearly 6 years of experience building decentralized applications and smart contracts across enterprise and DeFi ecosystems. Dual-track expertise combining nearly 4 years architecting a 13-container private blockchain platform at EY for the IMF, UN, World Bank, and the Ministry of Finance of Guinea-Bissau, with hands-on freelance DeFi work on Ethereum mainnet including flashloan arbitrage, AMM DEX design, and MEV-protected trading. Proven track record delivering secure, scalable on-chain systems end-to-end: smart contract design, cryptographic protocol integration, node infrastructure, and full-stack dApp development.…Blockchain software engineer with nearly 6 years of experience building decentralized applications and smart contracts across enterprise and DeFi ecosystems. Dual-track expertise combining nearly 4 years architecting a 13-container private blockchain platform at EY for the IMF, UN, World Bank, and the Ministry of Finance of Guinea-Bissau, with hands-on freelance DeFi work on Ethereum mainnet including flashloan arbitrage, AMM DEX design, and MEV-protected trading. Proven track record delivering secure, scalable on-chain systems end-to-end: smart contract design, cryptographic protocol integration, node infrastructure, and full-stack dApp development.

Shan Wain

Blockchain Developer, Full Stack Developer, Web Developer, +2

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Blockchain software engineer with nearly 6 years of experience building decentralized applications and smart contracts across enterprise and DeFi ecosystems. Dual-track expertise combining nearly 4 years architecting a 13-container private blockchain platform at EY for the IMF, UN, World Bank, and the Ministry of Finance of Guinea-Bissau, with hands-on freelance DeFi work on Ethereum mainnet including flashloan arbitrage, AMM DEX design, and MEV-protected trading. Proven track record delivering secure, scalable on-chain systems end-to-end: smart contract design, cryptographic protocol integration, node infrastructure, and full-stack dApp development.…Blockchain software engineer with nearly 6 years of experience building decentralized applications and smart contracts across enterprise and DeFi ecosystems. Dual-track expertise combining nearly 4 years architecting a 13-container private blockchain platform at EY for the IMF, UN, World Bank, and the Ministry of Finance of Guinea-Bissau, with hands-on freelance DeFi work on Ethereum mainnet including flashloan arbitrage, AMM DEX design, and MEV-protected trading. Proven track record delivering secure, scalable on-chain systems end-to-end: smart contract design, cryptographic protocol integration, node infrastructure, and full-stack dApp development.

Available to hire

Blockchain software engineer with nearly 6 years of experience building decentralized applications and smart contracts across enterprise and DeFi ecosystems. Dual-track expertise combining nearly 4 years architecting a 13-container private blockchain platform at EY for the IMF, UN, World Bank, and the Ministry of Finance of Guinea-Bissau, with hands-on freelance DeFi work on Ethereum mainnet including flashloan arbitrage, AMM DEX design, and MEV-protected trading. Proven track record delivering secure, scalable on-chain systems end-to-end: smart contract design, cryptographic protocol integration, node infrastructure, and full-stack dApp development.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

English

Fluent

French

Fluent

Work Experience

Full-Stack Blockchain Developer at EY

December 1, 2021 - December 1, 2025

Led and delivered a private Ethereum platform for IMF, UN, World Bank, and Guinea-Bissau's Ministry of Finance. Architected and operated a 6-node Geth network with custom on-chain contracts for authorization, RBAC, and audit trails; integrated Auth0 for cryptographic identity binding; rebuilt authentication layer to remove vulnerable third‑party service; achieved 95% reduction in security vulnerabilities and enabled government-grade deployment; scaled platform 15x and improved response times through database indexing, caching, and query optimization; deployed a 13-container production stack on Azure Kubernetes Service and designed an event-driven alert system (Kafka + GraphQL subscriptions) with a Python ETL ingesting 30k+ audit records.

Blockchain Developer at Self-Employed (Freelance)

January 1, 2020 - October 1, 2021

Built and deployed a flashloan arbitrage smart contract on Ethereum mainnet using AAVE V2, executing up to $1M in WETH borrow–trade–repay cycles within a single transaction. Developed a DeFi yield aggregator to compare APYs across Uniswap, AAVE, Balancer, and Yearn, routing capital to the best pool. Implemented an arbitrage trading bot that grew client funds from $10k to ~ $21k–$22k in 1 year. Delivered a React frontend with wallet authentication for a previously CLI-only dApp.

Founder & Lead Developer at CROW Automotive SaaS

November 1, 2025 - Present

Designed and shipped a multi-tenant B2B SaaS platform for automotive repair shops: API, database, payments, observability, and deployment. Onboarded the first enterprise customer on launch; operated the stack solo on Digital Ocean with Prometheus and Grafana for live monitoring.