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Web3 Backend & Fullstack Engineer — Solana & EVM. Six years building smart contracts, indexers and the interfaces on top of them.

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Nazar Havryliuk

01 / About

About me

I'm Nazar — a backend and fullstack Web3 engineer with six years of experience, five of them in blockchain, working across Solana and EVM chains.

6
years — Engineering, 5 of them in blockchain
6+
audits — External audits passed, no re-audit
$10M+
volume — Processed by the Bonq lending protocol
12
chains — EVM and non-EVM shipped to production

Education

MSc, Mathematical Modelling and Data ScienceNational Technical University of Ukraine, Kyiv Polytechnic Institute · 09.2018 — 06.2024

[email protected]

  • I take products from architecture to production: Solana programs in Rust and Anchor, EVM contracts in Solidity, then the indexers, backends and CI that keep them running. I'd rather delete a service than add one.

  • My code has passed six or more external audits, including Pashov Audit Group and Zokkio, with no re-audit required. I also handle remediation: diagnosing bugs on live systems securing millions and shipping the fixes.

  • As Smart Contract Competence Lead at Boosty Labs I own architecture decisions, supervise audits and mentor backend, DevOps and frontend teams, plus technical scoping for prospective clients.

02 / Services

What I do

Available for contract and full-time Web3 engineering work, remote from Ukraine.

Hire me

  • Smart contract development

    Solana programs in Rust and Anchor; EVM contracts in Solidity, tested with Hardhat and Foundry.

    01

  • Protocol architecture & audits

    Architecture reviews, audit supervision and remediation — six or more audits passed with no re-audit.

    02

  • Indexers & backends

    On-chain indexing services, NestJS and Rust backends, keepers, monitoring and CI/CD.

    03

  • Fullstack dApps

    React frontends with Solana and EVM wallet integrations, shipped to production.

    04

  • Cross-chain integration

    Bridges and settlement flows across EVM, Solana, TON, Stellar, Tron and Concordium.

    05

03 / Stack

The stack I run in production

  • Languages

    Day to day

    01
    • Rust
    • Solidity
    • TypeScript
    • Go
    • JavaScript
    • Python

  • Solana

    Anchor and native Rust programs, PDAs, CPI, SPL tokens

    02
    • Solana
    • Anchor
    • Rust
    • SPL Tokens
    • web3.js

  • EVM

    Contracts, tooling and L2 deployments

    03
    • Solidity
    • Hardhat
    • Foundry
    • Ethers.js
    • viem
    • Wagmi
    • The Graph
    • Safe
    • Tenderly

  • Backend & Frontend

    Services, APIs and the interfaces on top

    04
    • Node.js
    • NestJS
    • React
    • Next.js
    • Vite
    • Bun
    • axum

  • Data

    Storage and indexing

    05
    • PostgreSQL
    • MongoDB
    • Redis
    • Cassandra
    • Elasticsearch

  • Infrastructure

    CI/CD, cloud, monitoring and keepers

    06
    • Docker
    • AWS
    • Railway
    • Render
    • Netlify
    • Linux
    • Jenkins

  • Zero-knowledge

    Circuits and proving

    07
    • Circom
    • Groth16
    • snarkjs

  • Chains

    Shipped to production, EVM and non-EVM

    08
    • Ethereum
    • Polygon
    • Optimism
    • Arbitrum
    • Base
    • Avalanche
    • Solana
    • TON
    • Tron
    • Stellar
    • Concordium
    • Filecoin

04 / Experience

Where I've done it

Boosty Labs logo07.2024 — present

Lead end-to-end delivery of DeFi and cross-chain solutions across Solana, Ethereum, Avalanche, TON, Stellar, Tron, Concordium and Filecoin. Own architecture decisions, audit supervision and production deployment, and mentor backend, DevOps and frontend teams.

  • Eliza Protocol

    Led a fullstack restaking dApp for Orca concentrated-liquidity positions. Built the restaking program from scratch in Rust and Anchor — passed the Zokkio audit first time, no re-audit.

  • Saffron

    Solana programs in Rust that passed the Pashov Audit Group audit, plus the indexing service and transaction flows across Solana and EVM.

  • Tricorn Bridge

    Smart Contract Tech Lead. Owned contract architecture and settlement across EVM, Solana, TON, Stellar, Tron and Concordium — extended the bridge from EVM-only to non-EVM.

  • Akave

    Tech Lead for R&D on large-scale on-chain data anchoring. Benchmarked compression and storage strategies on cost, throughput and data integrity.

  • Somnia

    Diagnosed and fixed protocol bugs on a live system securing millions of dollars, and resolved external audit findings to production.

RustAnchorSolanaSolidityTypeScriptNestJSAWSRailway

05 / Selected work

Projects I owned end to end