Modernising Applications for Tomorrow: TEKsystems’ Tips for Application Modernisation

6 July 2025

Preparing your Organisation for Application Modernisation

Application modernisation isn't just a technology challenge. Success depends on whether the organisation is ready to adopt new ways of working.

To build that readiness, organisations need to look beyond systems and consider how people, processes and technology come together to support change. These three pillars underpin the ability to modernise effectively and realise long-term value, particularly as initiatives expand to include cloud, data and AI-driven capabilities.

Let's touch on the challenges within each pillar and what to address before moving forward.

People

• Resistance to change: An application development team that’s using a specific development methodology over several years is often resistant to change that needs upskilling, changes in ways of working, and usage of new development practices and patterns.
• Skills gap: Organisations often lack the expertise in the modern development frameworks and cloud technologies required to successfully execute modernisation efforts.

Process

• Legacy integration: Integrating legacy systems with modern applications can be complex and time-consuming, requiring careful planning and execution to ensure seamless interoperability.
• DevSecOps adoption: Integrating DevSecOps practices to simplify development, testing and deployment procedures could cause delays for organisations with low levels of DevSecOps maturity.
• Governance and compliance: Adhering to compliance and governance frameworks will introduce delays in adoption of modern application architecture.

Technology

• Complexity of existing systems: Decoupling tight integration across legacy components and processes while maintaining feature requirements requires significant time and resources.
• Data migration and integration: Migrating data for applications that are based on monolithic architecture and integrations among other systems requires careful evaluation of dependencies, compatibility and configuration. The complexity results in additional time spent before data migration can be executed for modern decoupled systems.
• Documentation: Applications built over a long period often result in inconsistent documentation, which makes it difficult to understand the inner workings of the application, inhibiting the ability to plan modernisation effectively.

TEKsystems Tips: Best Practices for Application Modernisation

Assess and prioritise your portfolio: Identify legacy applications that require modernisation and prioritise them based on business impact, technical debt and alignment with strategic objectives.

Evaluate the business case: Conduct a comprehensive cost-benefit analysis to understand the potential ROI of each initiative, including improvements in efficiency, productivity, customer satisfaction and revenue.

Select the right modernisation approach: Choose an approach that fits your requirements, whether that involves refactoring code, rearchitecting with microservices or migrating to cloud-based platforms.

Streamline development and deployment: Implement agile methodologies and DevOps practices to enable faster iteration, reduce time to market and respond more effectively to changing requirements.

Design for scalability and flexibility: Build applications with future growth in mind, using cloud-native architectures that support elasticity and seamless integration.

Enhance the user experience: Prioritise intuitive, responsive and user-friendly design to drive higher adoption and satisfaction.

Strengthen security and compliance: Embed robust security measures, including testing, encryption and access controls, to protect against threats and meet regulatory requirements.

Monitor and optimise continuously: Use observability tools and site reliability engineering practices to track performance, generate insights and refine applications over time.

Measuring Success in Application Modernisation

A successful modernisation initiative starts with defining clear, measurable business objectives. These should link directly to outcomes the organisation cares about, such as faster releases, improved user experience or reduced operational costs.

To make this measurable in practice:

• Define outcome-led metrics: For each objective, identify specific metrics. For example, if the goal is faster delivery, track deployment frequency or lead time for changes.
• Establish your baseline: Capture current performance before any changes. For instance, if releases currently take four weeks, this becomes your starting point for comparison.
• Set realistic improvement targets: Estimate what success looks like post-modernisation. This could mean reducing release cycles from weeks to days, or improving system uptime to a defined SLA.
• Track progress continuously: Monitor these metrics throughout the programme, not just at the end. For example, review performance after each release cycle to identify early gains or areas that need adjustment.

By combining clear objectives with ongoing measurement, organisations can demonstrate tangible progress, justify investment and continuously refine their modernisation approach.

Building Applications for Tomorrow

While application modernisation often requires a significant upfront investment, the long-term value extends far beyond immediate cost savings. Modernised applications are designed to operate more efficiently, scale more effectively and adapt to changing business demands without constant rework. By moving away from tightly coupled legacy systems, organisations can reduce the operational strain caused by outdated infrastructure, manual processes and frequent maintenance issues.

For example, shifting to cloud-native architectures can lower infrastructure overheads, while automated deployment pipelines reduce the time and effort required for updates and fixes. Over time, these gains compound. Improved system reliability means fewer outages and less disruption to the business. Streamlined architectures reduce the complexity of support and maintenance. Teams spend less time keeping systems running and more time delivering new functionality.

The result is a more sustainable cost model, where investment shifts from maintaining the past to building future capability. Organisations not only reduce spend across infrastructure, support and maintenance, but also create a foundation for innovation, enabling faster responses to market demands and more efficient delivery of new digital experiences.

Ready to Revitalise Your Applications?

TEKsystems Global Services can help you rethink how your business creates modern, agile applications with a future state of mind.

Whether your goal is process optimisation, business resiliency or revenue-driving transformation, find out how we can support your application modernisation journey so that you can adapt, respond and grow at speed.

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