Blockchain Developer

DAC.digital, a leading software and hardware company rapidly expanding across Europe, seeks talented Blockchain Developers to join our growing team. We specialize in providing top-tier engineering teams and developing innovative products that address complex business challenges. With over 14 years of experience in R&D projects for startups, scaleups, and enterprises, we bring unparalleled technical expertise to every project we undertake.

Key information:

Salary:

• 25 000 – 30 000 PLN net/month- pure B2B contract
• 22 000 – 26 000 PLN net/month – B2B contract (days off included)

You will be responsible for supporting our team in:

• designing and implementing blockchain solutions by applying your knowledge of blockchain fundamentals, including block architecture, consensus mechanisms, and token standards (ERC-20, ERC-721, ERC-1155, CW20);
• developing and deploying smart contracts using Solidity for Ethereum/EVM-based platforms and optionally Rust for Solana or Cosmos;
• conducting smart contract testing using tools such as Hardhat, Foundry, Truffle (EVM), and Anchor (Solana) to ensure robust and secure code;
• integrating wallets like Metamask, Phantom, and Keplr into decentralized applications (dApps), enabling smooth user interactions with blockchain networks;
• contributing to developing front-end dApp interfaces using JavaScript/TypeScript, React, and libraries like web3.js or ethers.js for Ethereum-based solutions;
• developing backend services using Node.js (optionally NestJS) and building APIs that facilitate blockchain interactions and data retrieval;
• supporting the creation and customization of blockchain chains with Golang, utilizing the Cosmos SDK for scalable solutions;
• implementing DevOps practices, including containerization with Docker and maintaining CI/CD pipelines for automated deployments and updates;
• collaborating with the team to optimize performance, improve security, and enhance the efficiency of blockchain-based systems.

Technology stack:

• blockchain fundamentals: block architecture, consensus mechanisms, and token standards (ERC-20, ERC-721, ERC-1155, CW20);
• smart contract development: Solidity (Ethereum/EVM) and optionally Rust (Solana, Cosmos);
• smart contract testing: Hardhat, Foundry, Truffle (EVM), and Anchor (Solana);
• wallet Integrations: integrating Metamask, Phantom, and Keplr into dApps;
• dApp Front-End Development: JavaScript/TypeScript, React, and web3.js or ethers.js for EVM;
• backend Development: Node.js (optionally NestJS) and API development for blockchain interactions;
• Golang Development: Golang for creating and customizing new chains using Cosmos SDK;
• DevOps: Docker, optionally Kubernetes and CI/CD pipelines for deployment.

Nice to have technologies:

• interoperability protocols: bridges (e.g., LayerZero, Wormhole) and IBC (Cosmos);
• Indexing and Querying solutions;
• node Operations: deploying and maintaining Ethereum nodes (Geth/Infura), Solana validators, and Cosmos full nodes;
• tokenomics implementation: the ability to design and implement token models, staking, and governance mechanisms;
• blockchain security: understanding vulnerabilities (e.g., reentrancy, overflow) and using tools like MythX, Slither, or Tenderly;
• gas optimization: techniques for minimizing transaction costs on EVM-based chains;
• Oracles and External Data: Integration with Chainlink, Band Protocol, and other Oracle solutions.

It is vital that you have:

• solid experience with block architecture, consensus mechanisms, and token standards;
• strong experience with Solidity;
• proficiency in using Hardhat, Foundry, Truffle (EVM), and Anchor (Solana);
• knowledge of English (min. B2); 
• working in agile methodologies (Scrum, Kanban);
• good communication skills;
• eager to learn and share knowledge;
• willing to travel if necessary (conferences, coworking events, etc.)

What do we offer:

• possibility to work 100% remotely or on-site at our office in Gdańsk;
• b2b contract with included 30 days off;
• private Medical care;
• group insurance;
• pre-paid card or Sport Card;
• referral program;
• real Agile practices;
• employee well-being online platform;
• cafeteria benefits.