Location: Remote (Preference for Europe/Central Europe time zones)

Contract Type: Freelance/Contract (2-3 months initial term, potential extension)

About the Project

Our client is an early-stage Web3 initiative building a groundbreaking local blockchain payment system designed to operate without internet connectivity. Using radio-based transaction technology, their goal is to empower small communities to run independent, low-bandwidth local networks with integrated payment systems.

This is an experimental project at proof-of-concept stage, backed by private funding. If successful, the work will extend into a multi-year build and open-source rollout across multiple regions.

Role Overview

We are looking for an experienced Blockchain Engineer with Cosmos SDK expertise to lead the design, deployment, and testing of a new blockchain network tailored for low-connectivity environments. You will be working directly with the CTO and a small distributed team of network specialists and engineers.

Key Responsibilities

• Deploy and configure blockchain networks using Cosmos SDK
• Build and test validator and node infrastructure optimized for low-bandwidth environments
• Integrate wallet and transaction systems capable of operating via radio communication
• Explore interoperability options using IBC (Inter-Blockchain Communication) and EVM module integration
• Contribute to architectural decisions for bridges and Ethereum connectivity
• Support testing of the proof-of-concept in live community environments (France/Spain pilot)
• Collaborate with the team using Slack and remote-first workflows

Requirements

• Proven Web3 / blockchain engineering experience (validators, nodes, wallets, proof-of-stake systems)
• Strong hands-on expertise with Cosmos SDK (mandatory)
• Familiarity with IBC and cross-chain communication (preferred)
• Experience with EVM-compatible modules and smart contracts (Solidity, Rust) a plus
• Solid understanding of blockchain consensus, security, and infrastructure deployment
• Comfortable working in an early-stage, experimental environment with fast iteration
• Fluent in English (written and spoken)

Why Join?

• Be part of an innovative project at the intersection of blockchain and real-world connectivity
• Opportunity to shape a system designed to bring payments to communities outside the reach of traditional internet infrastructure
• Work closely with a highly experienced CTO and a small, agile team
• Potential to extend into a longer-term role if the proof-of-concept succeeds

Apply, or send your CV at [email protected]