Have your contract audited

Smart contract audits are the first line of defense to safeguard your funds and those of your Dapp users.

Different audit firms are available on the market:

Smart Contract Security Audit Service Introduction, Exchange Security Solution - SlowMist - Focusing on Blockchain Ecosystem Security
Xiamen SlowMist Technology Co., Ltd., headquartered in Xiamen and founded by the team with over ten years of front-line cybersecurity defensive experience, specializes in ecology security of blockchain industry. The team members have built a security engineering with world-class influence. Since its formation in January 2018, as the first and the world's leading security company in China to focus on blockchain ecosystem security, SlowMist has served many well-known digital currency exchanges, wallets, blockchains and smart contracts around the world. SlowMist security services include Security Audit, Security Consulting, Defense Deployment, Blockchain Threat Intelligence (BTI), Bug Bounty and other related security products. SlowMist has independently discovered many common high-risk security vulnerabilities in the industry, which has received widespread attention and recognition from the industry. SlowMist not only studies the world-famous public Blockchains such as Bitcoin, Monero, Ethereum, EOS, Cosmos, Ontology, VeChain, etc. but also deeply participates in Ethereum and EOS. And it publishes thousands of well-known smart contract audit reports around DApp security offensive and defensive confrontation, security auditing, and defense. It is the direction of SlowMist's efforts to bring a sense of security to the blockchain ecosystem.
www.slowmist.com

Additionally, you may want to check out Rugdoc: a community-reviewed auditing platform:

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