On the Codacy blog there's a recent post that looks at some of the biggest threats to code quality (six of them) and some brief advice on how you can prevent them. Code quality goes beyond just style guides and common coding practices too.

In the process of building Codacy, I’ve learned that software companies in different life stages have different needs in terms of code quality. Early startups have, for example, very different needs in comparison to digital agencies and freelancers. There is however a common ground that links them all together: code quality is not being taken seriously enough, regardless of the stage. If this resonates with you, take action today. Continuous improvement is the central piece of software engineering craft.

Among the six things in their list are suggestions like:

• Using continuous integration
• Living with broken windows
• Heterogeneity (code styles)
• Not using static code analysis

They also link to some tools that can help fix some of these suggestions including JSHint, some PHP static analysis tools and CSSLint for CSS.