Alert: We are aware of a fraudulent email approach to some clients to change our bank details. Please note our bank details remain unchanged. If you’ve received any suspicious communication, please contact us directly.

Hire Tech ExpertsUpload Your CVGet in Touch iconGet in Touch
SubBanner banner image

Solidity Blockchain Engineer

Germany

Apply by 21 Dec 2025

30.0 - Per Hour

Job Ref.: 55728

Job Type: Contract

Apply Now
Share Job
Consultant
Sam Pyzer image
Sam Pyzer
Associate Director

Job Description

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).
APPLY NOW

Recent Jobs.

Network Architect
Zug, Switzerland

For our customer a manufacturing business- we are seeking a Network Architect focussed on Ciscothis is a 12 month contract based in ZugCompetative Rateand we seek an experienced professional available

ManageEngine Security Consultant (IAM / PAM / SIEM)
Amsterdam, Provincie Noord-Holland, Netherlands

Join a leading technology consultancy to deliver cutting-edge enterprise IT security solutions across Europe. I am looking for a Technical Consultant who blends deep technical knowledge with strong cl

Infrastructure/System Engineer
Geneva, Switzerland

I wanted to share an amazing 2X contract opportunity with an airline and aviation company that’s looking for a System/Infrastructure expert to join them on an initial 24-month contract.They’re seeking