Senior Solana Engineer (Smart Wallet)

Senior Solana Developer - CoFo Neobank

About the Project

We're building CoFo Neobank — the first AI-first smart wallet on Solana that brings the banking app experience (like Revolut, Robinhood) into the on-chain environment.

Our goal is to abstract blockchain complexity. We're building an architecture where every user gets a Smart Account (a programmable account, not a simple EOA) that supports multi-factor authentication (2/3 Multisig), access recovery, spending limits, and native integration of complex financial products (Staking, Yield, Perps, RWA).

Core Responsibilities

• Smart Account Architecture Development: Design and write custom Rust programs (Anchor) for managing user accounts. Implement multisig logic (Device Key + 2FA Key), key rotation, and access recovery (Social Recovery).

• DeFi Composability (Integrations): Write adapters and CPI (Cross-Program Invocations) calls to integrate external protocols directly into the smart account:

• Swap: Aggregation through Jupiter
• Yield & Lending: Integration with Kamino, MarginFi, Meteora
• Perps: Integration with Drift Protocol

• Security and Access Control: Implement spending limits system, protocol whitelisting, and replay attack protection.

• Portfolio Logic: Develop on-chain structures for position tracking (storing data about deposits, debts, PnL) for fast frontend/AI reading.

• Gas Abstraction: Implement mechanisms for paying fees on behalf of users (Fee Bundling / Gas Tank).

Requirements (Hard Skills)

• Expert Rust & Anchor: Deep understanding of Solana Sealevel runtime, memory management, PDAs, and Compute Units (CU) limitations.

• Account Abstraction Experience: Understanding of how to build smart contract wallets that differ from standard system accounts.

• DeFi Integration Experience: You've already worked with SDKs or IDLs of major Solana protocols (Jupiter, Kamino, Drift, etc.). You understand what CPI is and how to safely call external code.

• Cryptography: Understanding of signature operations (Ed25519), transaction verification, and building secure multisig schemes.

• Security Mindset: Experience with audits, knowledge of attack vectors on Solana (re-entrancy, account substitution, ownership checks).

Nice to Have

• Experience with Privy (for authentication) • Understanding of cross-chain bridges (Wormhole/LayerZero) for implementing deposits from other networks • Experience with tokenized assets (RWA) and Token-2022 standard

Tech Stack

• Solana (Rust, Anchor Framework) • Integrations: Jupiter, Kamino, Drift, MarginFi • Infrastructure: Helius, Privy

We Offer

• Work on a product that's changing UX in DeFi • Complex architectural challenges (not just another token fork, but sophisticated wallet infrastructure) • Competitive compensation in stablecoins/fiat + project options/tokens