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Ease of updating
Updates are an important part of any technology system. However, updating requires retesting everything an application does – even a small change can cause unexpected bugs. Since an eCommerce microservice has just one job, as long as it keeps doing it correctly, other units of code are unlikely to be affected, so it’s a lot more fault-tolerant.
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Increased scalability and predictable cost
If monolithic applications bog down under heavy demand, the only option is to replicate the entire software application to a bigger and more powerful computer - if one is available - and this migration process is hard to do, time-consuming, and costly. This type of scaling takes planning and can’t be done on a whim. If the demand peak is brief, such as a holiday season, this is a wasteful use of valuable budget without seeing a return on investment.
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Reusable among other applications
It’s quite likely that businesses need to reuse code and functionality. A business may have applications that perform related tasks but need different user interfaces, or different systems need to call a piece of functionality over and over again. In cases like these, several clients can share an eCommerce microservice – it just needs to be written once and deployed where it's needed. The reusable nature of microservices means that changes are easy to make and don't require rebuilding leading to less redundancy and more consistency.
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Higher security
All software architectures face security issues. However, microservices are protected from public access with state-of-the-art authentication and authorization. This makes them less vulnerable to cyberattacks. Plus, gaining access to one microservice is an isolated event; which does not mean access is granted to the entire application. A good eCommerce microservices architecture for modern commerce plans for security from the beginning, instead of adding it on as an afterthought. And it ensures that if any malware gets past front-line defenses, it won't easily be able to use the microservice.
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Avoiding vendor lock-in
Mixing microservices from multiple vendors is common. When a service publishes its API, other vendors can create their own services using that same API which means that a customer can switch from one microservice to another, in order to switch to a different database or get better performance. Customers can even mix cloud services and combine components that run on different platforms.
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Cleaner software design
The complexity of an application grows faster than the number of lines of code. Everything has to work with everything else, and a change in any part may have unexpected effects elsewhere. A microservice is a relatively small unit that interacts with other units only through APIs. The chances of unexpected side effects from a change are smaller, and easier to find and fix if they happen.
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