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Boosting Software Dev and Delivery with Feature Flags

· 7 min read
Alex Milea

Software development and delivery is a dynamic process that requires constant adaptation and frequent testing. Therefore, how can you ensure that your code is reliable and secure? Can you test new features without disrupting or compromising service performance? How can you enable your teams to innovate quickly and efficiently?

The answer is feature flags.

Red cat launching rocket

In this post, I will explain what feature flags are, who uses them, why they are beneficial and when they are applicable, how they work, and why you should use ConfigCat as your feature flag service provider.

What are feature flags?

Feature flags or feature toggles are software engineering techniques that turn certain functionality on and off during runtime without deploying new code. As a result, teams can make changes and experiment more with more control throughout the feature lifecycle. Feature flags can range from simple IF statements to more complex decision trees that act upon different variables. For example, you can use feature flags to:

  • Enable or disable a new feature for a subset of users based on location, device type, subscription plan, etc.
  • Perform A/B testing to compare different feature versions and measure their impact on user behavior and satisfaction.
  • Gradually roll out a new feature to a larger audience while monitoring its performance and feedback.
  • Quickly roll back a faulty or unpopular feature without redeploying your code.
  • Separate code deployment from feature release, so you can deploy code more frequently and safely.

Who uses feature flags?

Feature flags are widely used by software developers, testers, product managers, and marketers, but the best part is you don't have to be a coder to use them. Feature flags are easy and useful for anyone involved in software development and delivery, and they enable these different roles to collaborate more effectively by:

  • Giving developers more flexibility and control over their code.
  • Allowing testers to verify features in production environments without affecting other users.
  • Enabling product managers to launch features faster and validate hypotheses with actual data.
  • Supporting marketers to segment users and personalize their experiences based on their preferences.
  • Helping customer support agents troubleshoot issues and provide better service.
  • Allowing other team members to experiment with features and measure their impact.

Why use feature flags?

Feature flags offer many benefits for software development and delivery. Here are 3 of the main reasons why you should use feature flags:

1. Operational efficiency

Feature flags help you optimize your operational efficiency by:

  • Reducing the risk of errors and downtime by allowing you to test features in production before releasing them to all users.
  • Improve your code's quality by enabling continuous integration (CI) / continuous delivery (CD) practices.
  • Accelerating your feedback loop by allowing faster iterations based on actual data.
  • Simplifying your release management process by decoupling deployment from release.

2. Experimentation with feature flags

Feature flags help you learn from experimentation by:

  • Allowing you to run experiments with different versions of a feature without affecting other users or features.
  • Providing actionable insights into how users interact with your features based on metrics such as conversions, engagement, retention, satisfaction, etc.
  • Enabling you to make data-driven decisions based on evidence rather than assumptions.
  • Empowering you to innovate faster by validating or invalidating your hypotheses quickly.

3. Empower teams with entitlements

Entitlements allow different teams or individuals to access or modify certain features or settings. Feature flags enable entitlements by:

  • Allowing you to grant or revoke access rights for specific features based on roles, responsibilities, or needs.
  • Enabling self-service capabilities for non-developers who want to change certain aspects of a feature without relying on developers.
  • For example, you can enable marketers to change a banner's color, text, or layout without changing the actual code or allow customer support to toggle certain features on/off for specific users who report issues or request assistance.

Where feature flags make a difference

Feature flags can be applied to various scenarios and use cases that require dynamic and flexible control over features. Some everyday use cases for feature flags are:

  • Testing in production: By testing with real users and data in production environments, you can verify your features' functionality, performance, security, and compatibility before releasing them to everyone.
  • Gradual release: Feature flags allow you to gradually roll out features to a larger audience while monitoring their impact and feedback. This reduces the risk of errors and optimizes your user experience based on data.
  • Feature experimentation: You can run experiments with different feature versions and measure their impact on user behavior and satisfaction. This helps you innovate faster by quickly validating or invalidating your hypotheses.
  • Premium functionality: With feature flags, you can restrict premium functionality to specific customer groups. This allows you to offer distinct value propositions based on user segments.
  • Resource optimization: Disabling an optional feature with high resource consumption during peak usage helps you optimize your resource utilization by avoiding unnecessary load or cost.

How are feature flags deployed?

Feature flags can be deployed using various methods depending on your needs and preferences. Some standard methods are:

  • Code-based feature flags: These are feature flags that are implemented directly in the code using conditional statements such as IF/ELSE or SWITCH/CASE. These are simple and easy to use but require code changes and redeployment for every update.
  • Configuration-based feature flags: These are feature flags that are stored in external configuration files such as JSON or YAML. These are more flexible and scalable than code-based feature flags but require additional tools and processes for managing configuration files.
  • Service-based feature flags: These feature flags are collected by a dedicated service provider, such as ConfigCat. These offer the most benefits, such as centralized management, real-time updates, user segmentation, analytics, and more.

Why use ConfigCat for feature flags?

ConfigCat is a cloud-based service that provides an easy-to-use platform for managing feature flags across multiple applications and environments. With ConfigCat, you can:

  • Create and manage unlimited feature flags with a simple web interface.
  • Update your feature flag values instantly without redeploying your code.
  • Target specific users or groups based on location, device type, subscription plan, etc.
  • Run experiments with different feature versions and measure their impact with analytics.
  • Integrate with tools like GitHub, Slack, Azure, Jira, and more.
  • Access SDKs for various programming languages such as C#, Java, JavaScript, Python, Ruby, PHP, etc.

ConfigCat is trusted by thousands of developers worldwide to deliver better software faster and safer. To find out more, try ConfigCat for free here.


In this post, I discussed feature flags, what they are, who they are for, and why you should use them. Feature flags are a powerful technique that can help boost your software development and delivery process by enabling more flexibility and control, stress-free experimentation, improved learning, efficiency, and innovation.

By using ConfigCat as your feature flag service provider, you can leverage all the benefits of feature flags without any hassle or complexity. Start using ConfigCat today and see how it can transform your software development experience.

To stay up to date with the latest and greatest on feature flags, check out ConfigCat on Twitter, Facebook, GitHub, and LinkedIn.