Solidity Developer
Permissionless Interest Rate Swap Markets
Funding
Projects
About Kairos Labs, Inc.
Kairos can help you: Launch a market based on your protocol's underlying interest rate or yield; integrate interest rate swap markets into your platform; and access yield strategies through supplying liquidity to Kairos markets. The Kairos App (https://kairosswap.com) enables users to connect wallets on Ethereum or other blockchain networks to store and transfer digital assets and sign transactions; access and interact with decentralized finance (DeFi) protocols (including the Kairos Protocol) on public blockchains (e.g., Ethereum, testnets like Sepolia, or Layer 2 networks); and broadcast transactions for approving, minting, transferring, swapping, bridging and wrapping assets, and other interactions with DeFi protocols.
Skills
About the Role
You'll take ownership of core smart contract development for a decentralized interest rate swap protocol, building the foundation that enables traders and liquidity providers to exchange fixed and floating rate exposure on-chain. You'll shape protocol architecture, optimize gas usage, and drive security practices for contracts that handle real capital and complex financial logic. This is a remote role where you'll build infrastructure for interest rate markets in DeFi, working autonomously in an async environment.
Requirements
- 3+ years of Solidity development with production contracts deployed to mainnet
- Strong understanding of EVM internals, gas optimization patterns, and contract security
- Experience with DeFi protocol design—lending, AMMs, derivatives, or similar
- Familiarity with audit processes and common vulnerability patterns
- Proficiency with Foundry or Hardhat, including fuzzing and formal verification tools
- Ability to reason about protocol economics and mechanism design tradeoffs
- Track record of writing clean, well-documented, testable code
- Comfortable working autonomously in a remote, async environment
- Clear communication skills and high accountability
Responsibilities
- Design and implement core protocol smart contracts for interest rate swap mechanics
- Architect systems for scalability, minimizing gas costs while maintaining composability
- Lead security efforts including threat modeling, internal reviews, and coordination with external auditors
- Build upgrade patterns and admin controls that balance flexibility with decentralization
- Develop integration points for oracles, liquidation systems, and external protocols
- Write comprehensive test suites covering edge cases, invariants, and adversarial scenarios
- Optimize contract efficiency for high-frequency interactions and large position management
- Document contract architecture, trust assumptions, and integration specifications
Benefits
- Comprehensive health plans
- Flexible time off
- Token grant