Modernizing is not just about moving your legacy applications to either AWS or Azure through “Lift & Shift”. Just about anyone can claim they can do this with a new certification. What you need is to find a partner who understands that the monolithic application you have had for the last 15 years is not just code; you have invested a good part of your corporate lifetime in business logic within that application and almost certainly constitutes a significant portion of your revenue stream. Make this decision incorrectly and you are looking at blown budgets, delayed schedules and that dreaded call at 3 AM when your critical systems go down.
What I am going to provide you with is not a generic list of recommendations but rather what I wish I would have known before I made these moves and lost so much money.
What Is Application Modernization?
Application modernization means taking legacy systems and transforming them to work in modern infrastructure, usually cloud environments. That’s the textbook answer. The real answer is messier. It’s about making applications that were built for a different era play nice with containers, APIs, and deployment pipelines that didn’t exist when those apps were written.
There are a few paths you can follow when modernizing legacy applications as well. For example, some companies will attempt to re-host their legacy applications into the cloud as they currently are. This essentially means that you are simply recreating the expensive on-premises application in a cloud environment. Others will proceed to refactor their existing systems by keeping the core of their applications the same, but changing the code used to write the applications. Others may re-platform their existing applications by making only a few minor modifications so that they are able to take advantage of cloud computing capabilities. Finally, others will simply rebuild or replace their legacy applications entirely. This last option appears to be the cleanest option; however, it often does not account for all of the undocumented business rules that exist in the stored procedures for the legacy applications.
How you modernize your legacy applications is less important than if you can solve the problem of why your legacy applications are not able to keep up with the changing demands of your business. The end result of modernization should be that you are able to release applications on a timely basis, have the ability to scale your applications quickly, and be able to react quickly to market changes.
Why the Right Partner Matters?
Don’t believe anyone telling you legacy systems are easy to deal with, because they aren’t. That COBOL mainframe application you have running your transactions, the only reason that system is still alive today is because it works and it works because of the decades of different developers who developed the necessary handling for edge cases, many of which have almost no documentation. If you bring someone in to do a “straightforward migration” of the legacy system into a new system then they are going to cause problems you never knew existed.
One of the biggest concerns executives have is the risk of a business disruption at the time of modernization, for good reason. In multiple situations order processing systems have gone down during peak season due to not fully encompassing the Data Dependency Mapping requirements. You cannot simply turn off the old system, turn on the new system and expect everything to work. The actual modernization process will occur while the business is functioning normally, therefore, the application modernizing partner must have experience doing this type of technology migration.
Key Goals to Define Before Selecting a Modernization Partner
Be honest with yourself about your purpose ang goals of your modernization. I see companies saying they want to modernize their business, but really they just want to deploy more features faster, spend less money on infrastructure, and be able to handle an increase in traffic. These are business purposes, not technical requirements! You must convey this distinction clearly to your partner, as technical perfection does not always result in delivering business value.
1. Business Outcomes vs Technical Upgrades
- Identify the real business drivers: faster time-to-market, cost reduction, or elastic scalability
- Articulate outcomes in business terms, not just technical jargon
- Ensure your partner can connect technical decisions to business impact
2. Performance, Scalability, and Cost Goals
- Set concrete, measurable targets (e.g., “API response times under 200ms at 10,000 requests per minute”)
- Define cost expectations factoring in increased capability, not just raw spend reduction
- Understand that cloud doesn’t always cost less, but should deliver more value per dollar
- Establish clear baseline metrics to measure improvement against
3. Security, Compliance, and Reliability Requirements
- Make security and compliance architectural requirements from day one, not afterthoughts
- Identify all regulatory requirements specific to your industry (HIPAA, PCI-DSS, SOC 2, GDPR)
- Define acceptable downtime thresholds and reliability targets
- Ensure compliance is treated as foundational, not a feature to retrofit later
Essential Qualities of a Strong Application Modernization Partner
1. Proven Experience With Legacy Systems
Experience with cloud technologies in general won’t help you very much. Look for a company who has experience modernizing the exact type of system you have. If you have a mainframe, make sure to find a partner who has successfully moved off of mainframes and can show you how they did it. The same goes for old legacy monolithic systems built in frameworks that have not been updated in more than 10 years. The partner should be able to share examples of challenges they faced and solutions they implemented with similar technology stacks.
People often underestimate the importance of having industry experience. Banking applications have very different compliance requirements compared to retail systems. Data privacy requirements for healthcare applications are very different than e-commerce systems. An experienced partner in your industry will be able to anticipate issues that a generic partner would not see until it is too late.
2. Cloud and Architecture Expertise
Building cloud-native applications goes beyond using other people’s cloud services; it also means building applications that actually leverage the elasticity, managed services, and global reach of the cloud. Your partner should have a solid understanding of how to create stateless architectures, use eventual consistency, and develop distributed transaction solutions. If your partner intends to simply replicate your on-premise architecture using EC2 instances, they are not thinking of a cloud-native approach to application development.
3. Security and Compliance Focus
You cannot add security to your code after development. You have to design security into your architecture from the very beginning. This includes data being encrypted both in transit and at rest, proper identity and access management (IAM) processes, and using alternative methods of secrets management instead of relying on environment variables. When you are evaluating potential partners, make sure to ask them about their secure development practices. If they indicate that they perform security scans at the end of the project, you should go in a different direction.
Regulatory compliance is a separate area of expertise. Compliance such as HIPAA, PCI DSS, SOC 2, and GDPR should not be just a checklist of things that have to be completed. Regulatory compliance will influence the design architecture of how you manage data, how you log, how you create your audit trail, and how you implement access control. Your prospective partner needs to understand regulations that apply to your industry and how to design into compliance and not try to put it into place retroactively.
4. Automation and DevOps Capabilities
Modernization projects relying on manual deployment processes risk slow death. The lack of automated CI/CD pipelines contributes to your organization continuing to deploy modern applications using legacy methods, which defeats many purposes of modernizing in the first place. All features of deploying applications in a modern fashion (infrastructure as code, automated testing, automated deployment) should be part of the contract with your modernization partner to maintain operational speed after modernization.
Eliminating human error and unnecessary work is the primary focus. Each manual task performed during deployment creates an opportunity for system outages in the future. Your best modernization partner will automate their processes so they can remove themselves from providing further ongoing deployment support, leaving your organization with deployment pipelines that your internal teams can create and modify to meet your needs.
5. Change Management and Communication
One of the most underestimated aspects of modernization is the domino effect on the entire organization. From developers to operations to business stakeholders, everyone is impacted. A good partner will build consensus among all stakeholders, keeping them informed throughout the modernization process. Creating clear and actionable roadmaps with realistic timelines is critical; there should not be long-term aspirational timelines that get pushed back every two weeks.
Communication must be proactive and transparent. Problems will occur; systems will behave differently than expected; requirements will change. The key issue is whether your partner provides advance notice so changes can be made early enough to avoid extensive impact, or if they conceal issues until they become critical in magnitude or timing.
Questions to Ask a Potential Modernization Partner
- Start with how they assess modernization readiness. Do they do a proper discovery phase or are they ready to start coding after a single meeting? Good partners will want to understand your current architecture, business requirements, team capabilities, and organizational readiness before proposing solutions.
- Ask what modernization strategies they typically recommend and push them to explain why. Are they default rehosting everything because it’s fast and easy to sell? Or do they do actual analysis to determine the right approach for each application based on business value and technical constraints?
- Downtime and business impact are where theory meets reality. How do they handle cutover? What’s their rollback strategy when things go wrong? Have they done live migrations before, and if so, what did they learn? You want specific examples, not generic reassurances.
- Security and compliance handling should get deep scrutiny. What’s their process for security reviews? How do they stay current with regulatory requirements? Who on their team has compliance expertise, and will that person actually be on your project or are they just wheeled out for sales calls?
- Finally, understand what post-modernization support looks like. Are they disappearing the day after go-live, or do they provide ongoing support while your team ramps up? Knowledge transfer is critical and often shortchanged. Make sure it’s built into the engagement.
Choosing Blazeclan for Application Modernization
There are numerous technical factors to evaluate when looking for an application modernization partner, but others matter too. A great partner will help you meet your organization’s objectives, minimize risk, and future-proof your apps through secure, scalable, well-designed solutions. Our rigorous evaluation process ensures clients receive long-term value from their transformational work.
Blazeclan has a proven track record of successfully modernizing complex legacy applications across multiple industries. Our expertise spans cloud architectures, security, and DevOps automation. Our service delivery method provides both technical excellence and business outcomes, minimizing strain while ensuring long-term value. We don’t just modernize your apps; we partner with you to develop an environment conducive to ongoing innovation and growth within a cloud native environment.
