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Billy Siahaan

@billysiahaan

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Full-Stack and Blockchain developer with 6 years building scalable Web3 and web apps.

Indonesia

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What I'm looking for

I'm seeking a Full-Stack/Blockchain role where I can build secure, scalable Web3 products with cross-functional teams, focus on smart-contract security, and continue learning cutting-edge blockchain and AI technologies.

I'm a Full-Stack and Blockchain developer with six years of experience building scalable web applications and decentralized systems using React, Next.js, Node.js, PHP/Laravel, Python, and multiple blockchain ecosystems including EVM, Polygon, and Cardano.

At Jurat Inc I developed and deployed smart contracts for the Jurat Protocol, built dApps to manage Jurat Litigation Codes, integrated oracle networks, and led smart-contract security audits to improve reliability and regulatory compliance.

I have a proven track record delivering full-stack solutions across startups and enterprise teams in Indonesia and the US, and I bring a creative, calm, detail-oriented approach to collaborating with cross-functional teams to solve complex problems and drive growth.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

Jurat Inc

Feb 2022 - Present (3 years 7 months)

Developed and deployed smart contracts and dApps for the Jurat Protocol to enable court-integrated legal enforcement on blockchain platforms, integrated oracle networks for on-chain legal events, and conducted smart contract security audits to improve reliability.

Solidity Smart Contracts Web3 Oracle dApps Security Auditing React EVM

Full Stack Developer

The Big Rich Group

Oct 2020 - Mar 2022 (1 year 5 months)

Designed and implemented scalable web applications using React and Node.js, developed backend APIs and databases for e-commerce and AI initiatives, and collaborated on UI/UX, security, and performance optimizations across digital projects.

React Node.Js MySQL MongoDB API Development UI UX Performance Optimization AWS CI CD NodeJS

Full Stack Developer

PT. Seraya Makmur

Apr 2020 - Oct 2020 (6 months)

Built scalable web applications with React.js and Node.js, integrated backend APIs with MySQL and MongoDB to streamline inventory and order processing, and implemented responsive UI/UX to improve customer engagement.

React Node.Js MySQL MongoDB API Integration Responsive Design Ecommerce Performance Tuning NodeJS

Freelance Web Developer

Dapurcoding

Aug 2019 - Apr 2020 (8 months)

Delivered a specialized clinic application and expanded a portfolio website for Berkah Group, focusing on data management efficiency and responsive UI/UX to enhance customer experience.