Senior Blockchain Engineer

Other

Al. Jerozolimskie 179, Warszawa

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

Full-time

B2B

Senior

Remote

38.03 - 44.83 USD

Net per hour - B2B

Job description

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