Senior Blockchain Engineer

Senior • Remote

$140 - $165/

Warsaw, Poland

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

Lumicode Sp. z o.o. (Pentacomp Group)

Lumicode Sp. z o.o., part of the Pentacomp Group, operates in the IT industry, specializing in the development of innovative IT solutions and providing professional IT services to large enterprises and the public sector. With nearly 30 years of experience, the company prides itself on a rich history of completed projects. Lumicode emphasizes a blend of innovation and extensive experience, reflecting its commitment to delivering high-quality IT solutions. The company is distinguished by its long-standing presence in the market and its ability to adapt and innovate within the IT sector.