Application Modernization Best Practices

Author

Tony Bozic, Business Development Manager

What is application modernization?

We get into everything you need to know about application modernization in our in-depth guide on understanding legacy application modernization. But to recap, application modernization means taking your existing software and bringing it up to speed with today’s technologies. It’s not about chasing trends; it’s about unlocking agility, scalability, and resilience.

The most common modernization strategies include rehosting, refactoring, rebuilding etc., but choosing the right approach always depends on context. For banks, for example, regulatory compliance and security are paramount. See our 7 best practices for application modernization for banks for more.

Application modernization best practices

1. Start with a clear assessment

Don’t modernize for modernization’s sake. Start with a thorough audit and take into consideration the following:

What are your business goals?
Which systems are critical?
Where are the pain points (e.g., performance, maintainability, security, user experience)?

This assessment helps you identify and prioritize efforts instead of going the big bang route and trying to do everything at once.

2. Prioritize for impact

Not every system needs a full overhaul. Focus on applications that:

Deliver the most business value
Pose the highest risk if left untouched (security, compliance, scalability)
Are bottlenecks for innovation

3. Set measurable objectives

Modernization should be backed by a business case. Define what success looks like, whether it’s:

Reduced operational costs
Faster time-to-market for new features
Improved user satisfaction
Increased system reliability
…or all of the above.

You should also be sure to track progress with KPIs that matter to your stakeholders, such as:

Customer and user satisfaction
Adoption rate
System uptime
Operational and maintenance cost reduction
Revenue growth
Time-to-market
Scalability

4. Choose the right modernization path

There is no one-size-fits-all. Sometimes incremental refactoring is best; other times, a complete rebuild is the only way forward. Weigh the risks, costs, and benefits for each system.

Reference our complete guide where we get into application modernization strategies in more detail.

5. Plan data migration

Data is where modernization projects often stumble. Assess, clean, and map your data. Migrate only what you need, and validate rigorously to ensure integrity and compliance.

6. Adopt modern architectures

Modernization is your chance to embrace architectures that support agility:

Microservices: Decouple components for independent scaling and deployment.
Containers: Package applications for consistency across environments.
Cloud-native: Leverage managed services for scalability and resilience.

7. Plan security from day one

Security can’t be an afterthought. Integrate security reviews, automated scanning, and compliance checks into each stage of your modernization journey.

8. Invest in change management

Modernization is equal parts people and code. Prepare your teams for new workflows, tools, and mindsets. Provide training and encourage a culture of continuous improvement.

9. Test early, test often

Modernized systems deserve modern testing. Automate tests at every level—unit, integration, end-to-end—and run them continuously. This reduces risk and builds confidence in every release.

10. Iterate and learn

Treat modernization as an ongoing process. Gather feedback, measure outcomes, and adjust your approach as you go.

For more on evaluating legacy systems and choosing the right strategy, check out our Understanding Legacy Application Modernization guide.

Application modernization – real-world examples

It’s worth taking a look at how application modernization best practices play out in the real world. The following real-world examples illustrate how organizations have tackled complex modernization challenges such as transforming legacy systems, streamlining operations, and accelerating business outcomes by applying the principles we’ve outlined above.

These stories move the conversation from theory to practice, showing what’s possible when strategy, technology, and execution come together.

Case Study: STRABAG

STRABAG, a global leader in construction services, faced the challenge of managing complex, unconnected data across various ERP systems built on different technologies. To address this, Notch developed the “Digital Cockpit”: a web application that aggregates and synchronizes data from over 500 building material production operations into a single, real-time information hub.

This modernization effort delivered several key benefits:

Process automation: Multiple legacy ERPs were consolidated into a fully automated system, drastically reducing manual work.
Data synchronization: Real-time data access enabled more informed decision-making across the organization.
Expedited workflows: Tasks that once took several days can now be completed in minutes, thanks to standardized and digitalized processes.
Continuous improvement: The platform is designed for ongoing integration of new ERPs, supporting future scalability and agility.

STRABAG’s experience highlights how a clear modernization strategy—focused on automation, data integration, and user-centric design—can unlock significant gains in productivity, efficiency, and business agility.

Case Study: ELCA & Swiss Pharmacy Union

A standout example of application modernization in action is the collaboration between ELCA and the Swiss Pharmacy Union. Facing the challenge of uniting over 1,000 pharmacies across Switzerland’s diverse cantonal regulations, ELCA and Notch built a centralized e-commerce platform that transformed both patient and pharmacist experiences.

Key outcomes included:

System consolidation: Connected over 1,000 pharmacies into a single digital platform, enabling online shopping, medication reservations, and streamlined daily workflows.
Digital transformation: Provided patients and pharmacists with access to e-prescriptions, vaccination plans, invoice management, and electronic patient records—all through a unified interface.
Workflow optimization: Simplified regulatory compliance and daily operations for pharmacies, improving efficiency and service quality.
Scalability and usability: Delivered a platform that serves both business (B2B) and end-user (B2C) needs, with a focus on ease of use and future growth.

This project demonstrates how a strategic modernization initiative—anchored in best practices like system consolidation, digital transformation, and user-centric design—can deliver measurable improvements in efficiency, compliance, and user satisfaction.

Case Study: Digital.ai

Digital.ai, a recognized leader in value stream management and enterprise agile planning, partnered with Notch to advance two of its flagship DevOps products: Deploy and Release. These platforms are essential for Global 5000 enterprises seeking to automate, coordinate, and scale software delivery across complex technology environments.

Key highlights from this modernization journey include:

Specialized automation: Deploy and Release automate and orchestrate software releases and application deployments, replacing manual processes with standardized, automated workflows. This dramatically increases delivery speed and reliability.
Global collaboration: Notch established dedicated, globally distributed teams, enabling seamless collaboration and continuous product development across continents.
Advanced technology stack: The products leverage modern technologies such as Scala with Akka, React, and Go for Kubernetes operator development—demonstrating a commitment to scalable, cloud-native architectures.
Market leadership: The modernization and continuous evolution of these platforms helped Digital.ai maintain its leading position in the DevOps market, earning recognition as a Gartner Magic Quadrant Leader.
Sustained growth: Notch engineers serve as technical and team leads, driving further innovation and product development in a highly competitive, rapidly evolving sector.

This case demonstrates how strategic modernization, automation, and global teamwork can transform legacy DevOps tools into market-leading, enterprise-grade platforms—delivering measurable impact for both the provider and its customers.

CI/CD best practices for building modern applications

A modern application without a modern delivery pipeline is like driving while stuck in first gear. CI/CD (Continuous Integration/Continuous Delivery) is the transmission that lets you ship faster, safer, and more reliably.

1. Automate everything

Manual steps are bottlenecks. Automate builds, tests, deployments, and security checks. This isn’t just about speed—it’s about consistency and reducing human error.

2. Integrate early and often

Encourage developers to merge small changes frequently. This minimizes integration headaches and helps you identify issues early.

3. Mirror production in testing

Test environments should be as close to production as possible. This catches environment-specific bugs before they reach users.

4. Run fast, local tests

Enable developers to run quick, reliable tests locally before pushing code. This tightens the feedback loop and keeps quality high.

5. Secure your pipeline

CI/CD pipelines are a tempting target. Lock down access, scan for vulnerabilities, and monitor for anomalies at every stage.

6. Monitor everything

Visibility is key. Monitor your pipelines, deployments, and applications. Use metrics to spot bottlenecks and drive continuous improvement.

7. Plan for rollback

No deployment is risk-free. Implement rollback mechanisms so you can quickly revert to a previous state if something goes wrong. And something always does go wrong.

8. Document and share

Good documentation and open communication keep everyone on the same page. Document your CI/CD processes and foster a culture of knowledge sharing.

9. Shift left on security and quality

Move testing and security checks earlier in the pipeline. The sooner you catch issues, the cheaper and easier they are to fix.

10. Measure what matters

Track metrics like deployment frequency, lead time for changes, and mean time to recovery. Use these insights to refine your process.

Common challenges and how to overcome them

Resistance to change: Change is hard. Communicate the “why” early and often. Get buy-in from leadership and empower teams with training and support.
Tech debt: Don’t try to fix everything at once. Prioritize the highest-impact areas and chip away at technical debt incrementally.
Security and compliance: Integrate security and compliance checks into your pipeline. Stay up-to-date on regulations, especially in sensitive sectors like finance.
Data migration risks: Plan, test, and validate every migration. Involve stakeholders early and often to avoid surprises.
Skill gaps: Upskill your teams or bring in external expertise. Modernization is a team sport.

We’ve guided organizations through these challenges, helping them turn modernization from a headache into a growth engine. For more insights and actionable guides, explore our customer stories.

FAQ: Application modernization & CI/CD best practices

Q1: What are the first steps in a modernization project?

Start with a comprehensive assessment, map your systems, define business goals, and prioritize based on impact.

Q2: How do CI/CD pipelines reduce modernization risks?

They automate testing and deployment, catching issues early and enabling fast, safe rollbacks.

Q3: What’s the difference between refactoring and rearchitecting?

Refactoring improves code quality without changing its core structure. Rearchitecting redesigns the application’s architecture to support new capabilities.

Q4: How do you ensure data integrity during migration?

Audit and clean data before migration, use automated validation tools, and test thoroughly before and after.

Q5: What are the top security considerations in CI/CD?

Enforce access controls, automate vulnerability scanning, and integrate security checks throughout the pipeline.

Q6: How do you measure modernization success?

Track KPIs like deployment frequency, lead time for changes, system uptime, and business outcomes such as cost savings or user satisfaction.

Q7: How should banks approach modernization differently?

Banks must prioritize security, compliance, and minimal downtime. See our Best Practices for Application Modernization for Banks for tailored advice.

Q8: Where can I learn more about legacy modernization strategies?

Check out our Understanding Legacy Application Modernization guide for a comprehensive overview.

Conclusion

Modernizing your applications and building a resilient CI/CD pipeline isn’t just about technology; it’s about unlocking new business opportunities, delighting your users, and staying ahead of the curve. It’s a journey that requires clear vision, smart prioritization, and a willingness to embrace change.

At Notch, we believe in making modernization practical, measurable, and even enjoyable. If you’re ready to take the next step, we’re here to help you assess, plan, and execute with confidence.

Curious how modernization can transform your business? Contact us and let’s talk about your project.