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Solidity Blockchain Engineer

Munich, Bayern, Germany

Apply by 22 Oct 2025

€50 - €70 per hour

Job Ref.: BH-55728

Job Description

Fornour customer we are seeking a Blockchain Engineer for a long term project - We need a Lead Engineer with Solidity skills for an initial 3 month contact with a view to extend 

 - 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).
  • 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 experience with auditing tools (Slither, MythX, Echidna). 
  • - 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: 
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