One of the biggest challenges that software developers face is keeping up with the constant innovations and advancements in the industry. New programming languages and methodologies are continuously emerging. New frameworks and architectural patterns are constantly being developed to solve new problems that we didn't even know we had 20 years ago. The ongoing enhancements in browser capabilities, phone capabilities, and user interface libraries enable us to improve user experience by creating more intuitive and efficient interfaces. Hackers never let up on their mission to find new vulnerabilities and develop creative ways to exploit them. Amidst all of these things, learning and applying new skills is not a choice for software developers, but a necessity for survival. Remaining stagnant in your knowledge doesn't mean you are maintaining your position. It means you are becoming obsolete and increasingly vulnerable to the rapid changes unfolding around you.

So, what does this mean for legacy software applications?

What do you do when a colossal system that has been under continuous development for over 20 years is starting to look its age? The original programming language and framework is probably not anything that a modern software architect would choose to use today. Nevertheless, the system operates seamlessly, bearing witness to the countless hours and resources invested in it so far. In some cases, various programmers and software architects may have started projects to "modernize" the code but left things in a state where those renovations remain incomplete. This situation is similar to when someone does a partial remodel on a home, can't finish it, and then sells it to someone else. It's left in a state that of chaos and the next person might have a completely different vision on how it should have been remodeled. Then they mush go back and "fix" what someone else has tried to "fix". If you are the product owner for a legacy software system, you'll inevitably be faced with a monumental decision: do you delve into the challenging task of rewriting your application from the ground up, or do you opt to incrementally modernize the aging codebase?

How do you decide between rewriting and incremental modernization?

Different people will have different opinions on this, but let's consider some of the pros and cons.

The Case for Rewriting


  • Architectural Modernization: When you are done, you will have a cohesive system that uses modern languages, architecture, and frameworks (until 5 or 10 years later when it is all obsolete again).
  • Streamlined Maintenance: A system that is freshly coded using modern coding practices can be easier to maintain and debug. This minimizes the risk of critical issues and empowers your development team to work more efficiently.
  • Fortified Security: Legacy systems can sometimes carry security vulnerabilities that become increasingly challenging to patch, particularly if it relies on languages, frameworks, or other 3rd party technology platforms that are no longer being actively developed or supported.
  • Developer Enthusiasm: Developers often find it more engaging and exhilarating to work with the latest and greatest technologies. It is good for their career development as well as their moral, which can be good for your company.


  • Cost Mountain: It is significantly more expensive to do a rewrite because you are basically starting from scratch and reinventing the wheel.
  • Titanic Effort: You can't release the changes incrementally, so it is a massive effort to rebuild everything all at once. This can be very difficult from a project management perspective to ensure you stay within your project timeline and budget.
  • Dual Maintenance: You will have to keep maintaining the old system until the new one is done being developed.
  • Corporate Quandaries: In larger organizations, you run the risk that the project will never finish due to shifting priorities, or management changes that stop the project before it is complete. Then you end up stuck with a partially completed waste of resources and return to updating the old code because customers are tired of waiting for that elusive "new version".

The Case for Incremental Modernization


  • Cost-Efficiency: This approach is typically more budget-friendly as it focuses on refactoring existing code, reducing the financial burden compared to rewriting from scratch.
  • Leverage Legacy Investments: Preserving the parts of your legacy code that work well while strategically refactoring the parts that need modernizing will allow you to leverage the substantial investments you have already made in the product. Incremental modernizations also better leverage the institutional knowledge your team and your users have with the existing platform. 
  • Minimized Disruption: Incremental modernization minimizes user disruption, enabling your software to evolve while maintaining operational continuity.
  • Customer Visibility: By delivering improvements incrementally, you can introduce new features and enhancements more quickly. Your users will notice that you are constantly improving your product, which will have positive effect on customer satisfaction and retention.


  • Platform Constraints: If the existing architecture relies on technologies that are no longer being supported, that may impose constraints on your ability to fully embrace modern technologies and paradigms. Integrating modernized components with legacy systems can introduce complexities and compatibility challenges.
  • Refactoring Realities: Product owners must accept that requests for enhancements may require additional time for code refactoring and modernization. If you are working on one section at a time, there may also be some periods of time where the user-interface conventions are inconsistent across the application.
  • Resource Allocation: Balancing modernization efforts with ongoing maintenance can strain development resources and potentially extend project timelines. This may result in a prolonged transitional period, with elements of the old and new systems coexisting, potentially affecting user experience.
  • Consistency Counts: The development team must adhere to a consistent modernization strategy, and there must be a comprehensive plan to modernize the entire application. That plan must be followed from start to finish so that the entire application gets modernized. If you are not intentional about completing the modernization, then start a second wave of modernizations before the first wave is complete, you will end up compounding the original problem.

Blueprint for Success

The choice between rewriting and incremental modernization hinges on your software's unique circumstances, including budget constraints, user expectations, and the urgency of modernization. Whether you choose incremental modernization or a complete re-write, a well-thought-out plan and unwavering commitment are key:

  1. Thorough Assessment and Planning: Begin by conducting a comprehensive assessment of your entire application. Identify areas that require modernization, estimate the effort needed, and craft a detailed modernization plan. A well-defined roadmap is crucial for a successful transition.
  2. Consider Your Users: Keep your end-users at the forefront of your modernization efforts. Solicit their feedback, involve them in the decision-making process, and prioritize improvements that enhance their experience. A user-centric approach bolsters customer satisfaction and retention.
  3. Data-Driven Decisions: Leverage data analytics to inform your modernization decisions. Analyze user behavior, performance metrics, and feedback to identify which areas require immediate attention and enhancements can wait.
  4. Open Communication: Foster transparent communication between product owners and development teams. Alignment of expectations and priorities is essential to ensure a harmonious and effective modernization process.
  5. Quality Assurance and Testing: Implement rigorous quality assurance and testing procedures throughout the modernization process. Thoroughly validate each component and feature to ensure they meet performance, security, and usability standards.
  6. Stick to the Plan: Once you've selected your modernization approach, whether it's rewriting or incremental updates, stick to the plan. Consistency is key to maintaining a cohesive and efficient software system. Avoid the pitfalls of a patchwork approach by adhering to your chosen strategy from start to finish.
  7. Continuous Improvement: Modernization is an ongoing journey. After completing the initial modernization efforts, establish a culture of continuous improvement. Regularly evaluate your software's performance and identify opportunities for further enhancement.

By following this blueprint for success, you can navigate the complexities of modernizing legacy software with confidence. It's a journey that demands foresight, adaptability, and a relentless commitment to ensuring your software remains a valuable asset for years to come.

Modernize and Thrive with PALADEM 

At PALADEM, we understand the complexities of modernizing legacy software. With extensive experience in maintaining, enhancing, and modernizing legacy systems, we're your trusted companion on this transformational journey. Reach out today to explore how we can revitalize your legacy software and help it thrive.