Senior Protocol Engineer (EVM)

The Role

We’re looking for a founding Senior Protocol Engineer (EVM) to lead smart contract development for the K4 Credit Fund. The MVP will be a vault deployed on Arbitrum, and your work will lay the foundation for scaling into a fully permissionless protocol. You’ll own the design and implementation of core contracts, collaborate closely with backend/frontend engineers, and ensure security, efficiency, and composability at every layer.

What You’ll Do

• Design and implement smart contracts for the MVP vault on Arbitrum
• Develop core protocol logic for lending, collateral management, and liquidation with K4’s risk management team
• Collaborate with backend engineers to integrate off-chain trading and risk data
• Work with frontend engineers to deliver seamless on-chain/off-chain user experiences
• Prioritize security, gas efficiency, and composability in contract design
• Support audits and testing to ensure production-readiness
• Contribute to the long-term architecture of the credit protocol

What We’re Looking For

• Strong experience writing smart contracts in Solidity (Rust experience is a plus)
• Deep understanding of the EVM and L2s like Arbitrum
• Experience designing, testing, and deploying production smart contracts
• Familiarity with DeFi primitives (vaults, oracles, liquidation mechanisms)
• Comfort working across the stack with backend/frontend teams
• Passion for crypto, DeFi, and building permissionless systems

Bonus Points

• Prior experience deploying protocols on Arbitrum or other L2s
• Contributions to open-source DeFi projects
• Experience working with formal verification or advanced testing frameworks
• Knowledge of credit, lending, or trading protocols

Why Join Us

• Build the MVP vault on Arbitrum and shape the evolution into a protocol
• Join a team building from scratch, with real ownership and impact
• Work directly with founders, traders, and engineers on cutting-edge credit + trading infra
• Competitive pay + meaningful equity upside
• Immaculate vibes

We value curiosity and non-traditional career paths. If you don’t meet all the requirements perfectly but believe you would excel on the team, we encourage you to apply.

About K4

K4 is a digital asset trading desk. We’ve had success in market making and are now expanding into new businesses. Recently, we launched superstack.xyz to let third-party traders plug directly into our infrastructure. Our newest venture is a credit fund.

About the Credit Fund

The credit fund provides loans backed by traders’ spot assets and perpetual futures positions. Our long-term goal is to evolve from serving SuperStack traders into a permissionless on-chain credit protocol that serves everyone, including traditional financial institutions. We’re building the team from scratch, so this is a rare chance to join at the ground floor.

Listed in: Cryptocurrency Jobs, Developer Crypto Jobs, Trading Web3 Jobs, Senior Web3 Jobs, EVM Web3 Jobs, DeFi Web3 Jobs, Solidity Crypto Jobs, Smart Contract Web3 Jobs, Full Time Web3 Jobs, Remote Crypto Jobs, Web3 Web3 Jobs.