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Vanen Surya

@vanensurya

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Blockchain Engineer at HARA who built a private Besu network and an on-chain traceability platform.

Indonesia

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At HARA, I develop blockchain infrastructure and a supply-chain traceability platform using a private Besu network. I implemented zero-gas transactions and ZKP features for traceability and real-world assets.

I also developed a private testnet with an explorer, faucet, and API key gateway, and optimized a hybrid network migration to achieve 5,000+ TPS. I manage on-premise and cloud infrastructure, with 99.9% uptime reported for infrastructure and RPC services.

In my own projects, I’ve built smart contracts and blockchain analytics tools for wallet clustering and transaction tracing. I also developed a DEX swap simulator and routing algorithm, reducing slippage by an average of 15%.

Experience

Work history, roles, and key accomplishments

Current

Blockchain & Infrastructure Engineer

Current

HARA

Sep 2023 - Present (3 years 2 months)

Developed and implemented private blockchain networks using Besu, GoQuorum, and Geth, achieving high throughput and 99.9% uptime. Built ZKP-based traceability and RWA solutions, block explorers, and API key gateways for enterprise use.

Solidity Rust Go TypeScript JavaScript NodeJS Hyperledger Besu GETH GoQuorum Erigon Circom Groth16 Docker Kubernetes EC2 Azure VMs Grafana Prometheus Smart Contracts ZKP RWA NFT Blockchain Explorers API Gateway

Current

Smart Contract Developer

Current

Self-Project

Jan 2021 - Present (5 years 10 months)

Created diverse smart contracts including ERC20, ERC721A, and staking systems. Designed AI-assisted blockchain monitoring and decision systems, and developed backend services for commerce applications and PoA blockchain research.

Solidity ERC20 ERC721A Staking DeFi AI Blockchain Monitoring Backend Development

Backend Developer

Freelance

Jan 2024 - Mar 2024 (2 months)

Developed Swagger API documentation, API calls for marketplace listing and buying, user and product models, and request validation using Joi.

Swagger API Development NodeJS Joi Marketplace

Blockchain Developer

Tokenminds.co

Mar 2023 - Apr 2023 (1 month)

Developed Shopify app integrations for NFT creation and minting, collaborating with cross-functional teams to ensure scalability and security.

Shopify NFT Smart Contracts Integration

Web3 Developer

Kuncicoin

Oct 2022 - Mar 2023 (5 months)

Built and maintained smart contracts for NFT marketplaces, offerings, and collections. Conducted unit and integration testing using Truffle, Hardhat, and Foundry, and automated NFT transactions with bots using Ether.js.

Solidity Truffle Hardhat Foundry Ether.js NFT Smart Contracts Testing

Bug Bounty Auditor

Freelance

Feb 2022 - Oct 2022 (8 months)

Performed security audits for smart contracts, reporting high, medium, and low-risk findings. Achieved Top 100 Leaderboard in C4 with contributions to high, medium, and low-risk findings.

Smart Contract Security Audit Solidity