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Application Modernization

Keep the Value. Lose the Friction. Legacy Application Modernization Should Do Both.

Modernization does not always mean replacing everything. We help improve legacy applications through refactoring, replatforming, cloud migration, API enablement and architecture modernization, while protecting the parts that still work.

Explore your modernization path

Start with the outcome

What Is Holding You Back?

Pick the situation closest to yours. We'll show what we would change and where it sits in the range below.

Pick what is holding you back

What is holding you back

Every Change Costs More Than the Last

The application still works, but its frameworks, runtimes and dependencies have aged to the point where changing anything is slow and risky.

What we would change
What you could end up with
  • Refactored code with the technical debt actually paid down
  • Framework and runtime upgrades taken in shippable steps
  • A dependency set that is supported again
What it works with
  • The application as it runs today
  • The versions you are actually on
  • The changes that keep getting deferred
Best fitLegacy Application & Technology Modernization
Connected engineering
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What is holding you back

The Platform Underneath Is Wrong

The code is not really the problem. The runtime, the servers or the environment around it are what the application is fighting.

What we would change
What you could end up with
  • A move to a runtime or platform that fits the workload
  • Containerized services on managed infrastructure
  • Environments that can be rebuilt rather than nursed
What it works with
  • Where it runs now, and what that costs
  • How much code change you are willing to absorb
  • Your cloud or on-premise direction
Best fitReplatforming
Connected engineering
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What is holding you back

One Monolith, and Every Release Waits

Everything is coupled to everything, so scaling one part means scaling all of it and no team can ship without waiting for the others.

What we would change
What you could end up with
  • A modular architecture split along real domain lines
  • Services carved out with the strangler pattern, not a rewrite
  • Event-driven flows where the coupling was costing most
What it works with
  • The parts of the monolith that change most often
  • The teams that need to ship independently
  • The behaviour that must not change
Best fitRe-Architecture & Monolith Modernization
Connected engineering
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What is holding you back

It Has to Move, Without Stopping

The application, its data and its dependencies have to land somewhere new, and the business cannot absorb a cutover that goes wrong.

What we would change
What you could end up with
  • A dependency map produced before anything moves
  • Phased data migration with validation at each step
  • A cutover plan whose rollback has been tested, not assumed
What it works with
  • The environment you are leaving and the one you are entering
  • How much downtime is genuinely acceptable
  • The data that has to reconcile afterwards
Best fitApplication Migration
Connected engineering
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What is holding you back

Newer Systems Cannot Reach the Old One

The legacy application holds capability the rest of the business needs, and there is no supported way into or out of it.

What we would change
What you could end up with
  • Modern APIs over legacy capability, without reopening its core
  • Service wrappers and an integration layer others can build on
  • Identity and access handled once, not per integration
What it works with
  • What the legacy system can already do
  • The products and partners that need to reach it
  • How identity works across both sides
Best fitAPI Enablement & Integration
Connected engineering
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What we build

Application Modernization Capabilities

Not every legacy application needs the same treatment. Some need cleaner code, some need a new runtime or architecture, and some simply need a better way to connect with newer systems.

01

Legacy Application & Technology Modernization

Improve outdated applications, frameworks, dependencies and runtimes that are slowing down change or increasing maintenance risk.

Code RefactoringFramework UpgradesRuntime UpgradesDependency ModernizationTechnical Debt Reduction

02

Replatforming

Move an application to a more suitable runtime, platform or infrastructure while keeping unnecessary code changes to a minimum.

Runtime MigrationContainerizationManaged ServicesPlatform UpgradesEnvironment Modernization

03

Re-Architecture & Monolith Modernization

Restructure tightly coupled applications when the current architecture is limiting scalability, resilience or release speed.

Modular ArchitectureMicroservicesStrangler PatternDomain DecompositionEvent-Driven Architecture

04

Application Migration

Move applications, data and dependencies to a new environment while managing continuity and cutover risk.

Cloud MigrationData MigrationDependency MappingEnvironment MigrationCutover Planning

05

API Enablement & Integration

Expose legacy capabilities through modern APIs so older applications can work with newer products, services and external systems.

API DevelopmentAPI GatewaysService WrappersIntegration LayersIdentity & Access

AI in app modernization

AI Where Modernization Gets Complicated

AI can help teams understand older applications faster, uncover hidden dependencies and reduce the manual work involved in planning changes, while keeping engineering judgement in control.

01

Understand the Codebase

Use AI to summarize unfamiliar code, trace logic and surface areas that need closer review.

Code Understanding · Legacy Code Analysis · Documentation Assistance

02

Map Dependencies

Identify relationships between modules, services, databases and external systems before changes begin.

Dependency Analysis · Architecture Mapping · Impact Analysis

03

Accelerate Refactoring

Assist developers with repetitive code changes, framework updates and modernization tasks while keeping review in the loop.

AI-Assisted Refactoring · Code Transformation · Migration Assistance

04

Improve Documentation

Generate or update technical documentation around legacy logic, APIs and system behavior where knowledge has become fragmented.

Documentation Generation · API Summaries · Knowledge Extraction

05

Support Testing

Use AI to help identify test coverage gaps, generate test cases and compare behavior before and after modernization.

Test Generation · Regression Support · Change Validation

06

Surface Modernization Risks

Use code, dependency, and runtime signals to flag areas that may create migration, release, or stability risks.

Risk Analysis · Change Impact Detection · Technical Debt Insights

Explore AI & Machine Learning

Industry context

Application Modernization Across Industries

What is worth keeping and what has to change depends on the sector as much as the stack. Regulated environments, real-time operations and customer-facing platforms each put the pressure somewhere different.

01 / 09

FinTech

01Core System Integration
02API Enablement
03Cloud Migration
04Security Upgrades

Our work

Software Engineering in practice.

Engagements from the wider Software Engineering practice this service sits in — 6 of them written up in full.

View all case studies
Fixed deposit onboarding on a phone — the application form asking for a mobile number, ringed by secure, quick, reliable and seamless-banking markers.FinTech

Digitizing Trust: Paperless Fixed Deposit Onboarding for a Leading Small Finance Bank

A leading Small Finance Bank launched a 100% digital FD platform with compliance, security, and fraud prevention at its core. The solution cut onboarding to 15 minutes, boosted trust, and reduced support costs.

98%Identity verification accuracy30%Improvement in customer satisfaction
The MSME loan application on a phone in a stand, surrounded by floating approval and disbursement screens.FinTech

MSME Loan Journey: Digitizing Lending for a Leading Small Finance Bank

A Small Finance Bank’s MSME loan platform enabling faster processing, real-time verification, and better accuracy through unified web and mobile solutions.

60%Faster loan processing40%Faster document review
The C3 MedTech clinic dashboard on a laptop mounted to a slit lamp, showing left and right eye images with redness grading.Healthcare

C3 MedTech: Building a Smart Digital Companion for Dry Eye Disease Management

A HIPAA-compliant platform designed to help patients manage Dry Eye Disease while keeping clinics connected beyond visits. With guided diagnostics, secure patient-clinic linking, and cross-platform support, it boosts adherence, streamlines workflows, and scales across eye care practices.

40%Faster patient report access35%Smoother patient journey
The real-time payment screening console on a laptop against a green backdrop, showing a live transaction queue.FinTech

Real-Time Payment Screening for AML & Sanctions

A high-performance, real-time payment screening solution engineered to validate every transaction against global regulatory requirements, sanctions lists, and risk indicators, delivering ultra-low latency, automated decisioning, and operational transparency for compliance teams.

50%Faster transaction screening40%Faster sanctions validation
The SmartLend personal loan app on two phones, showing an instant loan offer and the application flow.FinTech

SmartLend: Scalable Personal Loan Engine for Digital Lending

A cloud-native platform for fast, secure, and compliant personal loans. With smart eligibility, fraud detection, and multi-tenant scalability, it enables instant onboarding, quicker approvals, and seamless white-label deployment.

60%Faster loan approvals50%Faster customer onboarding
The NQBPL production and wages dashboard shown as a stack of layered screens on a green ground.Manufacturing

NQBPL Wages Platform: Digitizing Production & Workforce Management

Unified manufacturing operations into a single platform for real-time production tracking and automated wage management, enabling greater efficiency, transparency, and scalability across locations.

55%Faster wage calculation50%Reduction in manual payroll effort

How we work

How Modernization Takes Shape

We start from what the application is actually costing you and which parts still earn their place, then change it in steps that can each be shipped, validated and reversed.

01

Assess What Still Works

Establish which parts of the application are worth keeping, what is genuinely limiting change, and where the dependencies actually run.

Focus
DependenciesTechnical debtRiskKeep vs change
02

Sequence the Change

Choose refactor, replatform or re-architect per component, and order the work so each step can ship without waiting for the one after it.

Focus
Refactor or replatformStrangler patternOrderScope
03

Prove Behaviour Holds

Validate that behaviour is unchanged where it should be, with the regression tests, the data checks and the rollback path agreed before any cutover.

Focus
RegressionData validationRollbackEvidence
04

Cut Over and Keep Going

Move in planned stages, run old and new side by side where that lowers risk, and retire legacy components once they are genuinely unused.

Focus
Phased cutoverParallel runRetirementMonitoring
Assess01 Assess What Still WorksSequence02 Sequence the ChangeProve03 Prove Behaviour HoldsCut over04 Cut Over and Keep Going

Insights

Thinking Behind Modernization.

Perspectives on legacy systems, replatforming, migration risk and changing software that the business is still running on.

On-Premise to AWS Migration guide for UK businesses planning cloud transformation
Cloud & Platform Engineering

A Strategic Guide to On-Premise to AWS Migration for UK Businesses

· Akash Thakor · 6 min read

Legacy system modernization blueprint: discover, disposition, replace or refactor, and incremental transition.
Software Engineering

Legacy System Modernization: The Decision Blueprint

· Rushabh Modi · 10 min read

Feature image showing enterprise eCommerce migration from a legacy platform to a new commerce system with data reconciliation, SEO redirects, integration testing, rollback, and traffic shifting
Software Engineering

eCommerce Migration: A Strategic Risk Playbook for Enterprise Replatforming

· Divyarajsinh Gohil · 6 min read

All Software Engineering writing

FAQ

Frequently Asked Questions About Application Modernization

Straight answers about refactoring, replatforming, the strangler pattern, data migration, and what legacy application modernization actually involves.

01What do application modernization services include?

Application modernization services can include code refactoring, framework and runtime upgrades, replatforming, re-architecture, cloud migration, API enablement and data migration. The right approach depends on what is limiting the application today, which parts actually need to change, and which are better left alone.

02What is the difference between refactoring, replatforming and rewriting?

Refactoring improves the existing code without changing its core behavior. Replatforming moves the application to a new runtime, platform, or infrastructure with limited code changes. Rewriting replaces large parts of the application and usually involves more cost, effort, and risk.

03What is the strangler pattern in application modernization?

The strangler pattern replaces a legacy application gradually. New functionality is introduced alongside the existing system, while older components are retired step by step. This allows modernization to happen without relying on a single large replacement, and each step can be released and reversed on its own.

04How do you migrate application data without downtime?

Data migration without downtime usually involves phased migration, replication, synchronization, and a carefully planned cutover. The exact approach depends on data volume, transaction frequency, and system dependencies, with rollback and validation planned before the final switch to manage continuity and cutover risk.

Available in

Application Modernization, by market.

The same practice, written up for the teams that ask for it most: what changes in each market — hours, residency, regulation, payments — and the work that transfers. One market page so far.

Your Legacy App Doesn’t Need to Stay Legacy

Modernize the parts that are slowing you down, keep what still works, and move forward without a risky full rewrite.

Start modernizing Explore software engineering

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