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"Breaking through the re-platform dilemma requires a new kind of technology leadership."


In today's rapidly evolving market, it can be challenging to keep up with the pace of innovation and stay competitive as a CTO. Consider platform modernization if your legacy platform hinders your ability to innovate and meet customer expectations.

By modernizing your platform, you can unlock numerous benefits, including adapting to new technologies, providing seamless customer experiences across all channels, and positioning your organization for long-term growth and success. Don't let your legacy system hold you back from achieving your goals. Embrace the future, overcome limitations, and advance innovation and development.

This chapter explores the indicators suggesting it's time to move towards composable architecture boldly. By understanding the need for platform modernization and the steps involved in the process, you can confidently make informed decisions to drive your organization forward.


Migrating off a legacy platform towards a modern microservice architecture is a significant decision for a CTO and certainly not a popular one. Here are some indicators that it might be time to make the bold move.

Customer: In today's world, consumers have high expectations for the services they use. They want seamless experiences consistent across all channels, whether through a website, mobile app, or in-store. They also expect to switch between channels without disruptions or delays. A business must meet these expectations to avoid losing customers to competitors that can provide the desired experience.

Legacy systems that need to be updated and able to adapt to new technologies can cause numerous problems, such as frequent outages and poor performance. These issues can negatively impact customer satisfaction, further reducing the business's bottom line and reputation in the market.

  1. Innovation: Your current platform needs to support your innovation strategies to ensure your long-term success. Therefore, it is essential to start exploring alternative platforms that can support your current needs and provide room for future growth and innovation.

  2. Market: The commerce landscape is rapidly evolving. If competitors or market leaders are shifting towards composable commerce platforms and gaining a competitive edge, it's an indicator that you should consider the move as well.

  3. Integration: Legacy systems often need help integrating newer technologies or third-party solutions. If you spend less time and resources on custom integrations, switching might be time.

  4. Expertise: If your team is more familiar with modern technologies and tools, and you're facing challenges in finding or retaining talent to maintain the legacy system, it's a sign to migrate.

  5. Scalability: If your platform is struggling to keep up with the demands of your growing business, consider a more scalable solution that can better serve your needs. By investing in a more robust platform, you can not only ensure that your website or application remains stable and reliable but also position your business for long-term growth and success.

  6. Maintenance: One of the factors that could make it more financially sound in the long run to migrate to a modern platform is the increasing costs of maintaining and updating the legacy system. These costs can be associated with multiple factors, such as outdated hardware, no longer supported software and the need for specialized personnel to maintain the system.

  7. Flexibility: Legacy platforms can be rigid and not readily adaptable to changing business needs. If you find making changes or adding new features a cumbersome process, consider moving to a more flexible platform.

  8. Security: Older platforms might not be up-to-date with the latest security protocols, making them vulnerable to breaches.

  9. Life Cycle: If the vendor of your legacy platform is phasing out support or has already discontinued it, it's a clear sign to start considering alternatives. You want to be aware when your system goes down, potentially causing disruptions to your business operations.

  10. Cost Benefit: The total cost of ownership is an essential factor when deciding whether to continue with a legacy system or migrate to a new platform. The TCO of a legacy system includes the cost of maintenance and downtime and the potential loss of business opportunities due to outdated technology.

Before making the decision, conducting a thorough cost-benefit analysis is crucial, considering both immediate and long-term impacts. Engage with stakeholders, including your engineering teams, business units, and external partners, to gather insights and ensure a smooth transition.


There are generally three implementation options for transitioning from a monolithic platform:

Big Bang: This involves completely overhauling the existing monolithic architecture to a composable one in one go. While it can be the quickest route to enjoy the benefits of a composable architecture, it also carries significant risks, including potential disruption of services and high upfront costs.

Parallel: In this approach, the new composable architecture is built alongside the existing monolith. Once the new system is ready and thoroughly tested, a switch is made from the old system to the new one. This method minimizes disruption but requires more resources as two systems must be maintained simultaneously.

Pattern: The strangled pattern technique involves gradually replacing parts of the monolithic system with microservices. As new features are added, or existing ones need to be updated, they are built as separate services. Over time, the monolith is "strangled" until the composable architecture fully replaces it. This approach reduces risk and allows for learning and adjusting, but the transition process can be longer.

Each of these approaches has pros and cons, and the choice between them should be based on factors like your organization's risk tolerance, resource availability, and timeline for the transition.


Planning re-innovation involves several key steps:

1. Assessment: Begin by thoroughly analyzing the strengths and weaknesses of your current monolithic system. Take the time to identify the functionalities performing well and those requiring improvement. This step is crucial for understanding the existing system and setting the stage for the migration process.

2. Design: Once you understand your business needs clearly, it's time to define the desired architecture. This involves making decisions regarding the technology stack, the microservices that will be required, and how these components will interact with each other. Carefully consider the scalability, flexibility, and maintainability of the design.

3. Approach: Choose the most appropriate migration approach based on risk tolerance, resource availability, and timeline. Options include the Big Bang approach, where the entire system is migrated at once; the parallel run approach, where the new system runs alongside the old one until it's fully functional; or the strangler pattern approach, where parts of the system are gradually replaced over time. Selecting the right direction is vital for ensuring a smooth and successful migration.

4. Planning: Develop a detailed plan for each step of the migration process. This plan should include specific timelines, resource allocation, and potential challenges that may arise during the migration. It's important to have mitigation strategies in place for any anticipated obstacles. A well-thought-out plan will help keep the migration on track and minimize disruptions to the business.

5. Carve Out: Start implementing the migration plan by gradually moving components from the monolithic system to the new architecture. Beginning with less critical services or those that can provide quick wins is recommended. This approach allows for valuable learning and adjustment before tackling complex system parts. Following this incremental approach can ensure a seamless transition while minimizing risks.

6. Testing: Regular testing is essential throughout the migration process to ensure the new system functions as expected. Conduct thorough functional testing to verify individual services' correctness and interactions. Additionally, perform performance testing to assess the scalability and efficiency of the system. Remember to prioritize security testing to safeguard against potential vulnerabilities.

7. Optimize: After each phase of the migration, closely monitor the newly implemented system to promptly identify and address any issues. Continuously optimize your architecture based on feedback and learnings from each step. This ongoing optimization will lead to an increasingly robust and efficient system.

8. Train: Enable your team to effectively work with the new architecture by providing the necessary training and support. This may involve upskilling your existing team members or recruiting new talent with the required expertise. Ensuring your team has the knowledge and capabilities to leverage the new architecture is crucial for long-term success.



Migrating to a composable architecture is an essential decision for any CTO looking to stay competitive in a rapidly evolving market. It offers numerous benefits, including seamless customer experiences, support for innovation strategies, scalability, flexibility, and enhanced security. By embracing this modern approach, you can position your organization for long-term growth and success.

Before making the migration, conducting a thorough cost-benefit analysis and engaging with stakeholders is crucial to ensure a smooth transition. Choose the implementation approach that aligns with your risk tolerance, resource availability, and timeline. Whether you opt for a Big Bang, Parallel Run, or Strangler Pattern approach, each has its advantages and considerations.

Understanding the strengths and weaknesses of your current system is essential when designing your new architecture. Define your architecture based on business needs and consider the technology stack, microservices, and their interactions. Plan each step of the migration process meticulously, including testing and optimization. Monitor the new system closely, address issues, and continuously optimize based on feedback.

Ensure your team has the necessary skills to work with the new architecture. This may involve training existing team members or hiring new talent. Embrace this opportunity to transform your organization and overcome any challenges that may arise during the migration process. Embrace the future, inspire innovation, and lead your organization to new heights.

Migrating to a more composable architecture is about staying competitive and daring to dream bigger and bolder. It is about embracing change and breaking free from the limitations of legacy systems. Doing so empowers your organization to innovate, adapt, and flourish in a dynamic market. Embrace this journey with courage and determination, and unlock the full potential of your organization.


As a CTO ask yourself the following:

  1. How can you ensure a seamless customer experience across all channels while migrating to a composable architecture?

  2. What steps can you take to address the challenges of integrating legacy systems with newer technologies or third-party solutions?

  3. How can you effectively balance the immediate and long-term impacts of migrating to a modern microservice architecture while considering the total cost of ownership?


Your takeaways from this chapter:

  1. The importance of migrating to a composable architecture to stay competitive in a rapidly evolving market.

  2. Embrace change and break free from the limitations of legacy systems.

  3. Foster seamless customer experiences across all channels during the migration process.

  4. Address integration challenges between legacy systems and newer technologies or third-party solutions.

  5. Balance immediate and long-term impacts while considering the total cost of ownership.

  6. Empower your organization to innovate, adapt, and flourish in a dynamic market.

  7. Ensure a smooth transition by conducting a thorough cost-benefit analysis and engaging stakeholders.

  8. Choose the implementation approach (big Bang, parallel Run, or strangler Pattern) that aligns with your risk tolerance, resource availability, and timeline.

  9. Understand the strengths and weaknesses of your current system to design an effective new architecture.

  10. Continuously monitor and optimize the new system based on feedback and learnings from each phase.


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