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Bohdan Pukhno

@bohdanpukhno

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Lead smart contract engineer helping Web3 teams ship secure, production-ready contracts.

Ukraine

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What I'm looking for

I’m looking to lead or architect smart-contract work for protocols in DeFi/RWA—owning production architecture, security hardening, testing, and audit readiness where zero-exploit standards are expected.

I help Web3 teams ship smart contracts that survive production—and audits. I’ve spent two years on the other side of the table at Hacken, which is why teams bring me in before they deploy and after something already breaks on-chain.

As a Lead Smart Contract Engineer at Swarm, I lead smart contract architecture for an EU-regulated tokenized asset platform. I shipped dOTC v2 to production (with atomic escrow swaps, Chainlink price feeds, and KYC/AML-gated execution) and built production cross-chain RWA synchronization with Chainlink CCIP, plus Nifty Bundles (ERC721/ERC1155-to-ERC20 vault exposure), all audited by PeckShield (with remediation reviewed by Pessimistic).

I also build multichain product lines for Belong Net across Solidity, Cairo (StarkNet), and TON, including the core on-chain economic loop for $LONG buyback/burn routing and ticketing, token-gated access, and check-in flows. Alongside this writer-side engineering, I maintain production deployments across 10+ mainnets and keep security standards, testing methodology, and audit preparation as the baseline for new contract work.

Experience

Work history, roles, and key accomplishments

Current

Lead Smart Contract Engineer

Current

Swarm Markets

Oct 2024 - Present (1 year 9 months)

Lead smart contract architecture for Swarm's EU-regulated tokenized asset (RWA) platform. Shipped dOTC v2, Chainlink CCIP-based RWA synchronization, and Nifty Bundles, and owns production deployments across 10 mainnets with audit-readiness standards and remediation ownership.

Contract Architecture Solidity EVM RWA Tokenization Mint And Burn Flows ERC 1155 Compliance Gating KYC AML Hardhat Foundry Security Review Checklists Audit Preparation DeFi

Current

Smart Contract Engineer (Multichain)

Current

Belong Net

Aug 2024 - Present (1 year 11 months)

Contract engagement for Belong Net's multichain platform, building production Solidity (ERC-721/1155, CheckIn flows, staking, $LONG logic), StarkNet/Cairo, and TON/Threaded Solidity contracts. Implemented the Belong CheckIn economic loop and $LONG swap infrastructure using Permit2-style approvals and slippage checks; contracts were audited by Hacken.

Smart Contract Lead / Advisor

M0narch

Sep 2025 - Apr 2026 (7 months)

Led smart contract development for a pre-launch on-chain iGaming platform focused on provably fair betting and fully on-chain game mechanics. Designed Solidity betting/game settlement and payout modules and integrated Pyth for fairness-critical randomness verification, owning pre-launch security hardening, testing, and deployment workflows.

Solidity Smart Contracts Provably Fair Betting Game Settlement Payouts Reusable Contract Modules Security Hardening

Smart Contract Engineer

Swarm Markets

Oct 2022 - Oct 2024 (2 years)

Built Swarm's RWA contract layer by shipping Permission Manager and multiple generations of OTC settlement (PermissionedDotc, OpenDotc V1/V2). Integrated Chainlink price feeds for per-user spending limits, established Hardhat/Foundry testing and documentation baselines, and owned audit remediation.

Solidity EVM Access Control Permissions Compliance Gating Spending Limits Hardhat Foundry Contract Testing Documentation Audit Remediation Upgradeable Patterns Smart Contracts

Smart Contract Developer Intern

Nethermind UK

Apr 2024 - Jul 2024 (3 months)

Selected for Nethermind's Cross-Chain & Emerging Ecosystems research program, researching and prototyping smart contract solutions for interoperability and emerging execution environments. Contributed to code reviews, technical documentation, and investigations related to cross-chain contract logic and deployment flows.

Cross Chain Interoperability Code Review Technical Documentation Smart Contracts

Smart Contract Auditor & Security Analyst

Hacken

Oct 2022 - Jul 2024 (1 year 9 months)

Performed smart contract audits across DeFi, DAOs, marketplaces, and token systems on EVM ecosystems. Identified vulnerabilities in access control, reward accounting, upgradeability, business logic, and oracle/integration patterns, and supported vulnerability report triage via HackenProof using standard secure development and analysis toolchains.

Smart Contract Auditing Security Analysis Access Control Upgradability Oracle Integration Patterns Hardhat Foundry Slither MythX

Co-Founder & CTO

Hata

Mar 2024 - May 2024 (2 months)

Co-founded and served as CTO for a smart-contract-based real estate agreements and on-chain payments platform launched at the Chainlink hackathon. Designed product and contract architecture end-to-end and owned technical implementation through the hackathon launch and subsequent acceleration program.

Smart Contract Development Contract Architecture On Chain Payments