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I'm Lazar Vukosavljevic, a senior blockchain developer with extensive experience building decentralized systems, smart contracts, and scalable Web3 applications. I specialize in Solidity, Rust, contract architecture, auditing, and secure protocol development, delivering reliable and gas-efficient on-chain solutions. My work spans DApps, tokenomics, DeFi-style logic, NFT utilities, and Web3 integrations. I bring 7+ years of full-stack development across PHP, Go, JavaScript, TypeScript, React, Next.js, Nuxt.js, NestJS, Laravel, and Symfony, enabling smooth integration between blockchain components and traditional back-ends. I’m known for turning complex requirements into clean, secure technical designs and delivering production-ready features. I have led the full lifecycle of blockchain products—from smart contract development and testing to integration, deployment, and ongoing optimization—while prioritizing security and reliability.…I'm Lazar Vukosavljevic, a senior blockchain developer with extensive experience building decentralized systems, smart contracts, and scalable Web3 applications. I specialize in Solidity, Rust, contract architecture, auditing, and secure protocol development, delivering reliable and gas-efficient on-chain solutions. My work spans DApps, tokenomics, DeFi-style logic, NFT utilities, and Web3 integrations. I bring 7+ years of full-stack development across PHP, Go, JavaScript, TypeScript, React, Next.js, Nuxt.js, NestJS, Laravel, and Symfony, enabling smooth integration between blockchain components and traditional back-ends. I’m known for turning complex requirements into clean, secure technical designs and delivering production-ready features. I have led the full lifecycle of blockchain products—from smart contract development and testing to integration, deployment, and ongoing optimization—while prioritizing security and reliability.

Lazar Vukosavljevic

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

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I'm Lazar Vukosavljevic, a senior blockchain developer with extensive experience building decentralized systems, smart contracts, and scalable Web3 applications. I specialize in Solidity, Rust, contract architecture, auditing, and secure protocol development, delivering reliable and gas-efficient on-chain solutions. My work spans DApps, tokenomics, DeFi-style logic, NFT utilities, and Web3 integrations. I bring 7+ years of full-stack development across PHP, Go, JavaScript, TypeScript, React, Next.js, Nuxt.js, NestJS, Laravel, and Symfony, enabling smooth integration between blockchain components and traditional back-ends. I’m known for turning complex requirements into clean, secure technical designs and delivering production-ready features. I have led the full lifecycle of blockchain products—from smart contract development and testing to integration, deployment, and ongoing optimization—while prioritizing security and reliability.…I'm Lazar Vukosavljevic, a senior blockchain developer with extensive experience building decentralized systems, smart contracts, and scalable Web3 applications. I specialize in Solidity, Rust, contract architecture, auditing, and secure protocol development, delivering reliable and gas-efficient on-chain solutions. My work spans DApps, tokenomics, DeFi-style logic, NFT utilities, and Web3 integrations. I bring 7+ years of full-stack development across PHP, Go, JavaScript, TypeScript, React, Next.js, Nuxt.js, NestJS, Laravel, and Symfony, enabling smooth integration between blockchain components and traditional back-ends. I’m known for turning complex requirements into clean, secure technical designs and delivering production-ready features. I have led the full lifecycle of blockchain products—from smart contract development and testing to integration, deployment, and ongoing optimization—while prioritizing security and reliability.

Available to hire

I’m Lazar Vukosavljevic, a senior blockchain developer with extensive experience building decentralized systems, smart contracts, and scalable Web3 applications. I specialize in Solidity, Rust, contract architecture, auditing, and secure protocol development, delivering reliable and gas-efficient on-chain solutions. My work spans DApps, tokenomics, DeFi-style logic, NFT utilities, and Web3 integrations. I bring 7+ years of full-stack development across PHP, Go, JavaScript, TypeScript, React, Next.js, Nuxt.js, NestJS, Laravel, and Symfony, enabling smooth integration between blockchain components and traditional back-ends.

I’m known for turning complex requirements into clean, secure technical designs and delivering production-ready features. I have led the full lifecycle of blockchain products—from smart contract development and testing to integration, deployment, and ongoing optimization—while prioritizing security and reliability.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Work Experience

Senior Blockchain & Web3 Backend Engineer at PATTIESWAP EXCHANGE

September 1, 2024 - July 1, 2025

Led production-grade UniswapV2-style DEX on BNB Smart Chain, extended AMM logic, router/swapping mechanics, LP fee handling, and multi-token liquidity models. Designed and deployed Solidity smart contracts for Yield Farming, Staking, Token Launchpad, Tokenomics, Vesting, and Governance. Implemented Subgraph indexing and analytics for real-time swap/TVL/LP metrics. Architected a governance token migration system with timelocks, DAO permissions, vesting, and upgradeable contract architecture. Built secure DApp frontends with React/Next.js/TypeScript/Tailwind, including wallet onboarding, staking dashboards, lock/claim flows, and analytics charts. Implemented security best practices and audits to mitigate reentrancy, MEV, overflow, XSS, CSRF, and business-logic attacks. Managed backend microservices for indexers, notifications, RPC caching, queues, and analytics.

Senior Blockchain Engineer at NodeSynapse

March 1, 2023 - September 1, 2024

Built a Shimmer EVM UniswapV2 fork with extended modules for Yield Farming, Token Launchpad, LP Lockers, vesting, presale, and DEX analytics. Developed cross-chain bridging logic using LayerZero, enabling secure token/message transport across BSC, Shimmer, and EVM networks. Designed and audited smart contracts for Governance Token Presale, vesting, token distribution, whitelisting, and early investor mechanics. Delivered full-stack DApp UI using Next.js, TypeScript, Tailwind, Wagmi, and Web3Modal—featuring presale dashboards, claim portals, LP management, and NFT reward systems. Integrated enterprise-inspired identity, traceability, and permission control into DeFi components for compliance use cases. Built backend services for chain monitoring, token analytics, and price generation. Implemented secure deployment pipelines and automated testing with Jest, Mocha, Cypress. Optimized smart contract gas usage and executed audits (slither, MythX, hardhat-security).

Lead Blockchain Protocol & Full-Stack Engineer at KRONOBIT NETWORK

April 1, 2022 - February 1, 2023

Led development of Qbit Network, a Layer-1 EVM-compatible chain, including RPC infrastructure, node orchestration, consensus components, Wasm modules, and chain-level security protocols. Built ecosystem products: Multichain UniswapV2 DEX (Qbit ↔ BSC), Token Launchpad, Explorer, Testnet Faucet, Vault System + Leverage Trading Engine. Developed high-performance smart contracts for Vaults, Leverage Trading, Risk Engines, Funding Rates, Chainlink Oracle integration, and cross-chain asset management. Architected bridging + rollup-style features, message relayers, and state-sync modules between chains. Designed full-stack DApps using React, Vue, Next.js, TypeScript, integrated directly with custom RPC endpoints. Implemented extensive backend systems: block indexers, real-time metrics pipelines, RPC load balancers, PostgreSQL/MongoDB data storage, and admin APIs. Managed DevOps with Docker, Kubernetes, Nginx, Ubuntu, multi-node network deployment, CI/CD, node monitoring, and automated backu

Blockchain Developer at MOONLIGHT FINANCE

June 1, 2020 - April 1, 2022

Built a multi-chain Token Launchpad supporting Presale, FairLaunch, Token Locker, Token Creation, and governance logic across BNB Chain, Arbitrum, Optimism, Base. Designed upgradeable smart contracts using transparent proxies, inheritance patterns, vesting, staking pools, and multi-chain minting logic. Developed a scalable Launchpad DApp using Next.js, React, Web3Modal, Wagmi, Zustand, and custom SDKs. Built backend APIs for analytics, indexing, KYC integrations, and LP lifecycle automation. Implemented front-end + back-end + smart-contract automated testing with Jest, Playwright, Mocha, Cypress. Enhanced security with XSS/CSRF hardening, presale anti-bot rules, and wallet validation policies.

Blockchain Engineer at DOGEEX EXCHANGE

October 1, 2019 - April 1, 2020

Built a DEX forking PancakeSwapV2 with deep customizations: AMM tuning, swap routing, staking vaults, yield farming, analytics, tokenomics, and governance modules. Developed an advanced NFT Marketplace with auction systems (English/Dutch), royalty mechanics, metadata rendering, and batch minting. Delivered complete DApp frontends for swapping, liquidity, charting, and farming. Authored Subgraph schemas and indexing logic for LP analytics, swap interactions, TVL tracking, and user portfolio insights. Managed backend services for data ingestion, queue processing, analytic pipelines, and wallet-based transaction aggregation. Performed smart contract audits, unit/integration testing, optimization, and deployment automation.