Security is paramount in DeFi exchange platform development. Start by conducting extensive code audits to identify vulnerabilities and eliminate them. Employ the principles of decentralized identity management to protect user accounts. Implement multi-signature wallets for added security and engage in bug bounty programs to encourage ethical hackers to find vulnerabilities. Regularly update and patch smart contracts to stay ahead of potential threats. Security is an ongoing process, and staying vigilant is crucial to safeguarding your DeFi exchange platform and users' assets.