Senior Blockchain Engineer

Who We Are

Lumicode Sp. z o.o. is part of the Pentacomp Group, a provider of IT solutions and professional IT services for large enterprises and the public sector.

As Pentacomp, we create IT solutions that combine innovation with years of experience - and we have quite a lot of it. We've been in the market for nearly 30 years and have successfully delivered many projects.

You will join a platform handling millions of viewers and massive transactional volume in real-time. We need to integrate secure, low-latency blockchain solutions with a high-performance Web2 backend.

Your mission: Build smart contracts that survive high throughput, optimize gas for retail users, and bridge the gap between on-chain assets and live video streams.

Tech Stack:

• Solidity, EVM

• Hardhat / Foundry

• Layer Zero, DeFi patterns, Upgradable Contracts

• Integration with high-load Backend and Payment Gateways

Responsibilities:

• Design on-chain components capable of handling high-frequency interactions (Live Commerce context).

• Write clean, gas-optimized Solidity code ready for Mainnet deployment.

• Work closely with Backend Engineers to connect Web3 logic with the transactional platform.

• Prepare codebase for external audits and implement security best practices (threat modeling, access controls).

Must-Have Requirements

• You understand storage slots, memory management, and low-level calls.

• You have deployed contracts to Mainnet that handle real value and traffic (not just testnet/hobby projects).

• Experience connecting Smart Contracts with frontends/backends (Web3.js, Ethers.js, Viem).

• You know common attack vectors (Reentrancy, Oracle manipulation, Front-running) and how to prevent them.

• Fluent communication in an international team.

Nice to Have

• Experience with cross-chain solutions (Layer Zero, Bridges).

• Background in DeFi (understanding liquidity, staking mechanisms).

• Experience leading the technical side of smart contract audits.

  
  

• Start date: 01.12.2025

• Work mode: 100% Remote, Flexible hours