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What are the benefits of application modernization?

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Stephen Weinrich
Senior Director,
Slalom
Published:
8 minute read

TL;DR

  • Application modernization delivers business value when legacy systems eat away at operational speed, resilience, efficiency, and AI adoption.
  • Early benefits include faster releases, lower maintenance costs, and improved operational stability.
  • Long-term value comes from enabling more adaptive operating models with stronger AI readiness, lower cost-to-serve, and sustained innovation capacity.

JUMP TO:

When is application modernization worth it?

Application modernization is worth it when legacy systems slow the business down. Many enterprises need modernization when they face issues like technical debt, aging infrastructure, fragmented data, slow release cycles, or skillset scarcity. These problems start creating operational drag and financial risk.

Organizations typically modernize to:

  • Reduce operational friction
  • Improve resilience
  • Lower cost-to-serve
  • Accelerate delivery speed
  • Strengthen security and compliance
  • Build a stronger foundation for AI workflows and future growth.

The most successful modernization efforts focus on improving operating capability—how things work. They don’t just replace old tools and infrastructure or rewrite software. In practice, that often means:

  • Reducing technical debt and maintenance overhead
  • Improving release velocity and deployment reliability
  • Modernizing workflows and human-in-the-loop operations
  • Strengthening governance, observability, and security
  • Improving data accessibility and integration
  • Enabling more adaptive operating models and AI readiness

App modernization is especially valuable when organizations need to move faster without making their operations (more) fragile. Also, many leaders now view modernization as a business resilience and adaptability initiative. Application modernization that supports long-term competitiveness, improves operational efficiency, and drives AI transformation—all levers for future growth. This is a mindset and strategy shift away from the idea that modernization is grounded in technology updates.


Resilience has board-level financial impact: 54% of serious or severe outages cost more than $100,000, and 16% cost more than $1 million.


Why do organizations fail to see measurable outcomes of app modernization?

Modernization efforts often fail if organizations only migrate infrastructure or repurchase applications. That work must also improve data and delivery operations, governance, engineering practices, and workforce adoption. Modernization that earns it spend improves how teams work, not just where or how efficiently applications run. Holistic application modernization strategies boost agility, resilience, and value realization.


Which modernization benefits appear first, and which take longer?

Application modernization benefits usually appear in phases. Most organizations see operational improvements first. Strategic and competitive advantages take longer.

Near-term modernization benefits

The first modernization gains are usually operational. That’s because organizations start with reducing technical debt, improving delivery processes, and stabilizing systems. Common early outcomes include:

  • Faster software releases through continuous integration/continuous deployment (CI/CD) pipelines
  • Reduced maintenance burden and infrastructure overhead
  • Better, real-time system visibility and observability
  • Lower incident volume and faster recovery times
  • Improved operational stability and resilience
  • Reduced manual operational work through automation and platform engineering

Many organizations can measure these operational improvements within the first 6–18 months of phased modernization.

Longer-term modernization benefits

Longer-term benefits typically emerge after organizations modernize delivery operations, governance, engineering workflows, and data foundations. Again, it’s not just about application architecture. These long-term outcomes often include:

  • Stronger AI readiness and AI enablement
  • More adaptive operating models
  • Scalable digital platforms and cloud-native capabilities
  • Improved customer and employee experiences
  • Better ecosystem integration and data portability
  • Greater flexibility for mergers, acquisitions, and future modernization initiatives
  • Increased innovation capacity and long-term competitive agility
  • Significant operational cost reductions

These benefits often take multiple modernization phases to achieve because they depend on broader changes in operations.


Hybrid edge-cloud operations found certain agentic and AI-heavy workloads achieved cost reductions exceeding 80% through optimized workload distribution.


Why do modernization outcomes arrive unevenly?

An uneven timeline is normal. So is uneven outcome distribution. Modernization creates flexibility and optionality before it creates transformation. That’s why some outcomes appear quickly while others take multiple phases to materialize and bubble into differentiation.

To maximize modernization outcomes, enterprises should treat modernization as a portfolio prioritization effort. Focus, first, on applications that create the greatest operational risk, maintenance cost, or delivery friction.

Here are some examples of modernization outcomes:

  • Teams commonly reduce deployment lead times from weeks to hours.
  • Organizations often cut cloud waste 18–30% during modernization.
  • Incident resolution time can decline materially with observability and platform engineering.

After organizations updated their operational foundations (underneath applications), large-scale innovation, AI transformation, and new digital business models come forward.


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THE SLALOM APPLICATION MODERNIZATION GUIDE

Legacy isn’t about age.

A 20-year-old system can be strategically valuable, and a two-year-old platform can create debt. Legacy needs to be addressed when it starts to limit your organization's ability to adapt, automate, integrate, secure, or innovate at the speed your business requires.

Get a practical approach to reducing technical debt, strengthening security, and building AI-ready application architectures that scale.


How does modernization improve resilience, scalability, and operational stability?

Application modernization makes systems easier to adapt, recover, observe, and operate whenever business conditions change. Organizations reduce downtime, improve release reliability, scale workloads more efficiently, and maintain operational continuity during periods of disruption or demand volatility.

Modernization does not automatically mean breaking every monolith into microservices. In many enterprise environments, modular monoliths outperform poorly designed distributed systems. This happens because they reduce operational complexity, integration overhead, latency, and observability gaps.

Modern resilience strategies often combine multiple architectural approaches based on workload requirements. Common modernization patterns include:

  • Containers and Kubernetes for workload portability and autoscaling
  • Hybrid cloud architectures to balance resilience, cost, latency, and regulatory requirements
  • Observability platforms that improve incident detection, telemetry, and recovery time
  • Resilience engineering practices that reduce single points of failure and improve release safety
  • Edge computing for low-latency applications that require localized processing or real-time responsiveness
  • Autoscaling infrastructure that dynamically adjusts to spikes in demand without manual intervention  

Many enterprises are also rethinking cloud strategy as part of modernization for resilience. Some workloads move to public cloud for elasticity and AI capabilities. Others remain on-premises or in private cloud environments to improve cost predictability, sovereignty, latency, or operational control.  

Increasingly, resilience is measured less by where workloads run and more by how quickly organizations can recover, adapt, and deploy change safely under pressure.


How does modernization reduce operational costs?

Modernization should absolutely not shift spending. Modernization should reduce cost-to-serve (not just refresh technology or change where workloads run). In many enterprises, modernization includes hybrid cloud optimization, workload repatriation, licensing rationalization, and toolchain consolidation to improve cost predictability and reduce operational friction.  

These modernization approaches can:

  • Improve cost predictability
  • Reduce operational friction and optimize AI workload costs
  • Reduce wasted infrastructure spend and align technology consumption with business value

The largest operational savings usually come from reducing manual work and lowering the maintenance burden associated with aging systems. Modern engineering platforms, automation, observability, and infrastructure optimization:

  • Reduce downtime costs
  • Simplify patching and support
  • Allow engineers to spend less time maintaining legacy environments

Modernization also reduces dependence on aging niche skillsets that are increasingly difficult and expensive to hire for.  


AI could support or automate more than 80% of tasks in some operational functions, with 26–36% time recovery potential.


Over time, modernization improves cost-to-serve by creating more adaptive operating foundations. Organizations can:

  • Deploy changes faster with more confidence
  • Scale infrastructure more efficiently
  • Govern AI, cloud, and platform costs with greater transparency and control

The most successful modernization programs treat modernization as an operating model improvement effort. They combine infrastructure modernization, technical debt reduction, platform engineering, and governance modernization into a broader resilience and efficiency strategy.


How does modernization enhance security, governance, and compliance?

As cyber threats and regulatory expectations continue to rise, modern architectures improve security and compliance by embedding governance directly into delivery operations through DevSecOps, software supply chain controls, and continuous monitoring.

Recent breaches like the Change Healthcare Data Breach (impacting almost 193MM people) have reinforced this urgency. Resilience, third-party risk, and operational continuity are at the top of executive agendas.

Organizations modernizing regulated environments increasingly align to frameworks like SOC 2, FedRAMP, HIPAA, and DORA while also preparing for emerging risks like post-quantum cryptography migration. Common outcomes include stronger auditability, automated patching, improved telemetry, reduced ransomware exposure, and faster policy enforcement across hybrid environments. At the same time, organizations gain modern data solutions that improve customer and patient experience.


How does modernization accelerate software delivery and innovation?

Application modernization accelerates software delivery by reducing the operational friction that slows engineering teams down. Innovation often stalls when developers spend more time maintaining environments, troubleshooting dependencies, or navigating manual release processes than they do building customer and business capabilities. Modernization improves developer experience (DevEx) through platform engineering, CI/CD pipelines, internal developer platforms, release automation, and standardized workflows that help teams provision environments faster and deploy changes more safely.

Organizations are using AI to do more than write code and build product. Increasingly, AI-assisted engineering and generative AI are used to accelerate legacy analysis, code documentation, testing, refactoring, and release workflows.


Slalom modernization programs have shown 3–4x faster development velocity. We’ve helped regulated enterprises reduce refactoring time by 60% and projected $100M in savings through AI-enabled modernization workflows.


The results come quickly: safer releases, faster provisioning, reduced manual labor, improved deployment frequency, and more reliable software delivery. Modernization also helps organizations establish scalable engineering foundations. These foundations support future AI adoption, platform reuse, and continuous delivery without increasing operational risk, including developer burnout.


How does modernization accelerate DevEx, internal development, and release cycles?

Modernization succeeds when it works for teams, not just systems:

  • Modernization improves developer experience (DevEx) through platform engineering, CI/CD pipelines, internal developer platforms, paved roads, automated environment provisioning, and standardized golden path workflows that make releases faster, safer, and more repeatable.
  • Modern engineering organizations also use AI-assisted engineering and generative AI to improve release automation, code analysis, testing, documentation, and deployment workflows. These capabilities support smaller modular releases, easier experimentation, improved cross-functional collaboration, and safer deployment cycles with stronger AI coding governance and release controls.

Engineering friction is measurable: 69% of developers lose eight or more hours per week to inefficiencies, with technical debt cited as a top contributor.


Application modernization examples by industry

Modernization reduces friction in the moments customers notice most. Here are real-world examples of application modernization benefits in major industries:


Automotive, mobility, manufacturing and supply chain modernization examples 

Automotive & mobility

Legacy friction:

  • Siloed vehicle, dealer, and customer systems
  • Limited visibility across the vehicle lifecycle
  • See also Manufacturing

Modern experience:

  • Connected, coordinated mobility experiences and predictive servicing
  • Ambient diagnostics and driver support that proactively surface service, safety, and performance needs

Measurable outcome:

  • Reduced downtime
  • Reduced warranty claim costs
  • Faster vehicle service turn time
  • Improved service prediction
  • Improved vehicle and fleet utiization
  • Improved route efficiency
Manufacturing

Legacy friction:

  • Slow issue escalation across plants and operations teams
  • Disconnected operational systems
  • Reactive maintenance and limited predictive insight into equipment health

Modern experience:

  • Real-time operational visibility and connected production workflows
  • Ambient operational monitoring that surfaces risks, throughput issues, and maintenance needs proactively

Measurable outcome:

  • Reduced downtime, higher throughput
  • Minimized recalls
  • Reduced maintenance costs
  • Improved operational stability and yield consistency
Supply chain & logistics

Legacy friction:

  • Poor shipment visibility
  • Manual coordination
  • Delayed exception handling
  • Siloed planning, inventory, supplier, and logistics data

Modern experience:

  • Real-time logistics visibility and automated orchestration
  • Ambient supply chain agents proactively negotiate contracts, identify disruptions, reroute inventory, and surface other operational risks

Measurable outcome:

  • Fewer delays
  • Improved cash flow
  • Reduced operational friction
  • Improved inventory and logistics efficiency
  • More resilient end-to-end supply chain

Financial services modernization examples 

Banking

Legacy friction:

  • Slow, generic, manual onboarding
  • Delayed fraud alerts and reactive risk workflows
  • Batch processing
  • Siloed customer, servicing, and operational data

Modern experience:

  • Faster payments 
  • Unified digital banking experiences
  • Automated governance, compliance, and operational monitoring frameworks
  • Financial copilots surface next-best actions, fraud risks, and personalized guidance in context

Measurable outcome:

  • Faster transaction completion
  • Lower abandonment
  • Lower support escalation
  • Faster fraud response and reduced loss
  • Improved digital adoption, cross-sell conversion, and retention
  • More fluidity, stability, and flexibility
Capital markets

Legacy friction:

  • Slow trade workflows
  • Delayed market insights
  • Fragmented risk systems and compliance operations
  • Siloed market, client, and transaction data
  • Manual post-trade, reconciliation, and exception workflows

Modern experience:

  • Real-time trading platforms with faster access to market signals and insights
  • Integrated market data
  • Automated post-trade processing and exception management
  • AI-assisted research and predictive analytics embedded into workflows

Measurable outcome:

  • Faster trade execution, settlement, and exception resolution
  • Reduced operational risk
  • Improved compliance efficiency
  • Lower cost to serve across operations
  • Faster time to market for new products and capabilities
Insurance

Legacy friction:

  • Slow claims processing
  • Fragmented customer communication
  • Limited self-service
  • Delayed catastrophe response and high-volume claims surges

Modern experience:

  • Digital claims workflows
  • Integrated policyholder experiences
  • Ambient claims copilots that guide adjusters and customers through next-best actions

Measurable outcome:

  • Faster claims resolution
  • Faster underwriting decisions and policy issuance
  • Lower claims handling, support, and other operating costs
  • Improved adjuster and underwriter productivity
  • Greater scalability during catastrophe and high-volume events
  • Reduced claims leakage and fraud loss
  • Improved customer trust, policyholder retention, and renewal rates

Healthcare & life sciences modernization examples

Healthcare & wellness

Legacy friction:

  • Scheduling and care friction across providers, systems, and patient touchpoints
  • Clinician distractibility and burnout
  • Delayed access to records, lab results, and care updates
  • Fragmented payer and provider workflows
  • Siloed data and disconnected technology across the care journey

Modern experience:

  • Unified patient access
  • Interoperable records
  • Streamlined care coordination
  • Ambient clinical documentation and AI-assisted workflows
  • Connected patient experiences across digital and in-person channels
  • AI-enabled navigation, scheduling, and patient self-service

Measurable outcome:

  • Reduced administrative and workload burdens
  • Improved portal usage
  • Lower scheduling friction and cancellation gaps
  • Reduced contact center and operational costs
  • Improved clinician productivity and experience
  • Fewer care gaps through proactive patient engagement
  • Faster access to appropriate care
  • Higher patient satisfaction
  • Improved patient interactions, satisfaction, and outcomes
Life sciences, med tech & pharmaceuticals

Legacy friction:

  • Siloed clinical, operational, and commercial data
  • Slow trial coordination
  • Limited visibility into patient recruitment and trial participation bottlenecks
  • Delayed insight generation
  • Delayed market access

Modern experience:

  • Integrated R&D and commercialization data
  • Integrated evidence and commercialization platforms
  • Ambient research copilots accelerate documentation, analysis, and evidence generation
  • Copilot supported reimbursement and patient engagement workflows

Measurable outcome:

  • Faster patient recruitment and enrollment
  • Faster time-to-insight
  • Reduced operational overhead, including stockouts and overstock
  • Reduced evidence generation costs 
  • Improved trial efficiency
  • Faster commercialization
  • Improved provider engagement
  • Stronger evidence delivery 
  • Faster adverse event detection and response

Retail & consumer goods modernization examples

Retail & CPG

Legacy friction:

  • Siloed loyalty, POS, and e-commerce customer data
  • Manual supply chain coordination and inventory forecasting
  • Inconsistent omnichannel experiences

Modern experience:

  • Personalized commerce and ambient shopping assistants
  • Faster checkout
  • Real-time inventory visibility and tracking
  • Dynamic fulfillment options

Measurable outcome:

  • Increased customer lifetime value (LTV)
  • Lower cart abandonment/higher cart recovery
  • Higher conversion
  • Improved loyalty
  • Optimized inventory and logistics
  • Improved demand forecasting accuracy
  • Faster promotion and pricing execution
  • Faster fulfillment
Travel & hospitality

Legacy friction:

  • Complex booking journeys
  • Disconnected experiences
  • Service delays

Modern experience:

  • Unified digital booking and personalized traveler experiences
  • Ambient travel assistants coordinating just-in-time and real-time recommendations, support, and itinerary updates

Measurable outcome:

  • Increased booking conversion
  • Optimized lodging fees
  • Higher loyalty engagement
  • Higher, more consistent affiliate partnership revenue
  • Improved customer satisfaction

Sports, media & communications modernization examples

Entertainment

Legacy friction:

  • Fragmented ticketing
  • Poor personalization
  • Disconnected fan experiences
  • Siloed audience, content, and commerce data
  • Manual content, rights, and distribution workflows

Modern experience:

  • Unified fan platforms
  • Real-time ticketing
  • Personalized content and loyalty experiences
  • Unified audience profiles across digital and physical touchpoints
  • AI-enabled content discovery, recommendations, and engagement

Measurable outcome:

  • Higher ticket conversion
  • Increased fan retention and LTV
  • Reduced churn
  • Improved engagement time
  • Higher per-fan spend across tickets, merchandise, and experiences
  • Faster content activation and time to market
  • Improved monetization of content and first-party audience data
Marketing

Legacy friction:

  • Fragmented martech, campaign, and customer data platforms
  • Slow content production and approval workflows
  • Limited attribution clarity across channels
  • Inconsistent personalization and journey orchestration
  • Fragmented or superficial personalization

Modern experience:

  • Real-time personalization
  • Unified customer profiles and omnichannel engagement
  • Unified customer experiences
  • Ambient engagement systems delivering optimize content, offers, and service interactions continuously

Measurable outcome:

  • Lower churn
  • Improved engagement
  • Higher monetization efficiency
  • More real-time market and customer data to work with
  • Faster experimentation and optimization cycles
  • AI-enabled audience segmentation and content operations
  • Lower CAC
  • Stronger digital presence
Sports

Legacy friction:

  • Disconnected fan apps and account experiences
  • Delayed live updates
  • Unreliable real-time data
  • Inconsistent venue and gameday experiences
  • Fragmented merch, ticketing, loyalty, staffing and crowdflow systems

Modern experience:

  • Real-time fan engagement platforms
  • Connected venue experience
  • Integrated loyalty and commerce
  • Personalized highlights
  • Dynamic venue navigation
  • Predictive concessions

Measurable outcome

  • Higher in-venue revenue
  • Improved fan satisfaction, loyalty, and LTV
  • Lower cart abandonment
  • Stronger digital engagement and app adoption
  • Reduced queue times (more transactions)
  • Higher streaming engagement and content consumption

Technology, government & social impact modernization examples

Education

Legacy friction:

  • Manual intake, eligibility, and approval workflows
  • Slow, inconsistent service delivery
  • Disconnected classroom, services, workforce, and support analytics
  • Aging infrastructure and siloed data systems

Modern experience:

  • Unified digital portals across enrollment, advising, workforce programs, and alumni engagement
  • AI, even ambient AI learning assistants to support navigation, onboarding, and more personalized guidance

Measurable outcome:

  • Faster service delivery
  • Higher adoption
  • Improved engagement
  • Improved student success, including faster intervention, improved completion rates, and better workforce placement outcomes
  • Higher retention
  • Stronger alumni networks, donors, and community participation
Government

Legacy friction:

  • Long wait times
  • Paper-heavy, repetitive workflows
  • Fragmented citizen systems
  • Inconsistent service
  • Limited visibility into constituent needs and operational bottlenecks

Modern experience:

  • Digital self-service portals
  • Mobile access
  • Integrated benefits workflows
  • AI assistants guide users through eligibility, forms, and next steps in plain language

Measurable outcome:

  • Faster service delivery
  • Fewer processing delays
  • Lower support volume
  • Improved user satisfaction
  • Improved employee satisfaction
  • Faster reporting cycles and better policy responsiveness
Technology

Legacy friction:

  • Product delivery bottlenecks
  • Fragmented developer workflows
  • Inconsistent support
  • Siloed product, engineering, and operations data
  • Manual infrastructure provisioning

Modern experience:

  • Faster release cycles and unified platform operations
  • Ambient developer copilots automate testing, documentation, and operational guidance

Measurable outcome

  • Improved deployment frequency
  • Reduced toil
  • Higher engineering productivity
  • Faster-root-cause resolution
  • Faster environment setup
  • Reduced configuration drift
  • Lower operating cloud costs

Telecommunications, energy & utilities 

Telecommunications

Legacy friction:

  • Customer churn
  • Slow issue resolution
  • Disconnected sales and service systems
  • Faster environment setup
  • Reduced configuration drift
  • Lower operating cloud costs

Modern experience:

  • Real-time customer operations and proactive service management
  • Ambient network intelligence predicting service degradation and recommending remediation

Measurable outcome:

  • Reduced churn
  • Reduced outage frequency/Improved uptime
  • Faster support resolution
  • Just-in-time upgrade offers
  • Faster field resolution times
  • Improved first-time fix rates
  • Lower operational costs
Energy & utilities

Legacy friction:

  • Aging grid infrastructure with limited real-time telemetry
  • Delayed outage response
  • Fragmented operational data
  • Poor field coordination

Modern experience:

  • Real-time grid visibility and predictive maintenance workflows
  • Ambient field intelligence supports crews with contextual risk, repair, and asset guidance

Measurable outcome:

  • Faster outage recovery
  • Reduced unplanned maintenance events
  • Improved resilience
  • Lower regulatory compliance, reporting, and incident costs
  • Lower operational and public safety risk

Which application modernization benefits matter most to the business?

Application modernization creates the most value when it improves how the business operates. The near-term benefits are often practical and measurable: faster releases, lower maintenance burden, stronger resilience, better observability, reduced manual work, and more reliable delivery. Over time, modernization can create broader advantages by improving data accessibility, strengthening AI readiness, reducing cost-to-serve, and enabling more adaptive operating models.

For organizations evaluating where to start, prioritize around your biggest business constraints. What applications create the greatest operational risk, maintenance cost, delivery friction, or barriers to growth. Modernize those areas first, prove the value, and use the results to guide the next phase.


APPLICATION MODERNIZATION CONSULTING

Slalom’s application modernization services

Slalom helps organizations progress toward Zero Legacy with modernization initiatives focused on measurable business outcomes.

Our customers around the globe are modernizing mainframes, applications, and enterprise data with results that include:

  • 2–4x faster delivery for a U.S. education agency through AI-enabled engineering
  • $100MM projected savings and a 60% reduction in refactoring time for a global technology leader
  • 30% reduction in technical debt and $1.1MM reduction in annual mainframe operating costs for an iconic manufacturer and retailer
  • 66% lower compute costs and 50% faster workflows for a major federal healthcare agency
  • 5–9x engineering velocity increase using AI-accelerated modernization for a leading financial services provider

We partner with Amazon Web Services (AWS), Databricks, Google Cloud, Microsoft, Open AI, Salesforce, Snowflake, and over 700 of the world’s leading technology providers to support modernization across complex enterprise environments.




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