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Solidity Blockchain Engineer

Germany

Apply by 21 Dec 2025

30.0 - Per Hour

Job Ref.: 55728

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Stellenbeschreibung

We need a Lead Engineer with Solidity skills for 3 months. Preferrably a freelancer, but could also be someone from the partner company.
- Writing smart contracts in Solidity.  - Ability to design modular, reusable contract architectures.  - Track record of designing contracts following industry best practices (SWC Registry, OWASP guidelines for blockchain).  - Ability to design interfaces/APIs that work with off-chain systems (REST, gRPC, SAP, etc.)  - Implementation of ERC standards (ERC-20, ERC-721, ERC-1155, ERC-4626).
Skills that separate great candidates from OK ones:  Experience in Hyperledger Besu would be great. Understanding of Besu’s enterprise features (privacy groups, permissioning, IBFT2 consensus). Experience with gas optimisation, inheritance patterns, libraries, and modifiers. Ability to write upgradeable contracts (e.g. using OpenZeppelin’s proxy patterns). Familiar with common attack vectors (reentrancy, overflow/underflow, frontrunning, flash loan exploits).
TDD/BDD with frameworks (Hardhat, Foundry, Truffle). Hands-on with tools like Docker and CI/CD pipelines for smart contracts. The old backend is written in Go, so Go is a plus. Hands-on experience with auditing tools (Slither, MythX, Echidna).
We need a Lead Engineer with Solidity skills for 3 months. Preferrably a freelancer, but could also be someone from the partner company.
- Writing smart contracts in Solidity.  - Ability to design modular, reusable contract architectures.  - Track record of designing contracts following industry best practices (SWC Registry, OWASP guidelines for blockchain).  - Ability to design interfaces/APIs that work with off-chain systems (REST, gRPC, SAP, etc.)  - Implementation of ERC standards (ERC-20, ERC-721, ERC-1155, ERC-4626).
Skills that separate great candidates from OK ones:  Experience in Hyperledger Besu would be great. Understanding of Besu’s enterprise features (privacy groups, permissioning, IBFT2 consensus). Experience with gas optimisation, inheritance patterns, libraries, and modifiers. Ability to write upgradeable contracts (e.g. using OpenZeppelin’s proxy patterns). Familiar with common attack vectors (reentrancy, overflow/underflow, frontrunning, flash loan exploits).
TDD/BDD with frameworks (Hardhat, Foundry, Truffle). Hands-on with tools like Docker and CI/CD pipelines for smart contracts. The old backend is written in Go, so Go is a plus. Hands-on experience with auditing tools (Slither, MythX, Echidna).
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