L E A F Y W I N G S
App Audit UX Modernisation Architecture Migration API Integration Performance Security Cloud Testing Support
Where the debt accumulates

Your App Shouldn't Hold Your Business Back

Older applications often accumulate technical debt, outdated dependencies, inconsistent UX, fragile integrations, performance issues, and security risks as business requirements evolve.

Technology
  • Outdated frameworks
  • Unsupported OS versions
  • Hard-to-maintain code
  • Limited scalability
Experience
  • Slow performance
  • Frequent crashes
  • Poor UX
  • Difficult releases
Connectivity
  • Legacy APIs
  • Duplicate systems
  • Manual data transfer
  • Integration failures
  • Security gaps
How we approach it

Improve the Product Without Losing Sight of the Business

We assess the existing application and business ecosystem first, then create a practical modernisation roadmap that prioritises risk, user impact, business continuity, and long-term maintainability.
01Assess what exists
02Prioritise by business risk
03Modernise in controlled increments
Better user experience Improved stability Faster releases Lower technical risk Easier maintenance Better integrations Modern platform support Improved visibility Reduced manual work A stronger foundation for future features
App modernisation services

Modernisation Across the Entire Application Lifecycle

Legacy App Assessment

Review code, architecture, dependencies, integrations, performance, security, infrastructure, testing, and operational risks.

UX/UI Modernisation

Redesign outdated screens, navigation, workflows, forms, dashboards, and interaction patterns while preserving important business functionality.

Framework & Dependency Upgrade

Upgrade mobile frameworks, libraries, SDKs, dependencies, build systems, and platform compatibility where appropriate.

Architecture Modernisation

Refactor tightly coupled or fragile application layers into a more maintainable and testable structure.

Performance Optimisation

Diagnose slow startup, rendering, network, memory, database, image/media, and API-related bottlenecks.

Security Modernisation

Improve authentication, authorization, secret handling, secure storage, API protection, dependencies, logging, and security controls.

Cloud & Infrastructure Modernisation

Improve backend services, deployment, observability, environments, storage, CDN, monitoring, and scalability where required.

Mobile Platform Migration

Prepare applications for current iOS and Android requirements, device capabilities, and supported platform versions.

Application Migration

Move selected components or the complete application to a more appropriate technology stack when the business case supports it.

Ongoing Modernisation

Establish a roadmap for incremental improvements instead of allowing technical debt to accumulate again.

App integration services

Connect Your App to the Systems Your Business Already Uses

Modern applications become significantly more useful when customers, employees, data, and business systems can exchange information reliably.
What we connect
REST APIs GraphQL where appropriate CRM ERP Ecommerce Payment gateways Booking systems Inventory Accounting Maps Messaging Notifications Analytics Cloud storage Identity providers Third-party SaaS
What it should achieve
  • Remove duplicate data entry
  • Synchronise information
  • Automate workflows
  • Create a consistent customer experience
  • Improve visibility
  • Reduce operational friction
API modernisation

Build a More Reliable Integration Layer

Legacy APIs can become difficult to extend, insecure, inconsistent, or expensive to maintain. Modernisation creates clearer boundaries between mobile applications, backend services, and external systems — but only after we assess existing endpoints, dependencies, traffic patterns, data contracts, and business-critical workflows.
  • Authentication
  • Authorization
  • Versioning
  • Validation
  • Error handling
  • Rate limiting
  • Logging
  • Webhooks
  • Data transformation
  • Documentation
  • Monitoring
Legacy technology assessment

Know What Needs to Change Before You Rewrite Anything

A technical assessment separates urgent risks from safe-to-defer technical debt, and prevents unnecessary rewrites.

Code quality Architecture Dependencies Framework age Platform compatibility APIs Database Authentication Security Performance Testing CI/CD Infrastructure Monitoring Documentation
What you get back
  • Risk register
  • Modernisation priorities
  • Technical recommendations
  • Migration options
  • Estimated complexity
  • Phased roadmap
Assess My Existing App
Modernisation strategies

Choose the Right Path for Your Existing App

Modernisation does not always mean a complete rewrite. These are ordered roughly by how much of the existing product changes — the right one depends on business risk, technical debt, product goals, architecture, users, and roadmap.

Refactor

Improve internal structure while keeping the core product and technology direction.

Replatform

Move to a supported or more suitable framework/platform with controlled changes.

Rearchitect

Change major architectural boundaries where the existing structure prevents scalability or maintainability.

Incremental Rewrite

Replace selected modules or workflows gradually while the existing application continues to operate.

Full Rebuild

Rebuild when technical, business, or product conditions make a controlled replacement more valuable than continued modernisation.

Hybrid

Combine approaches across different application areas based on risk and business priority.

UX/UI modernisation

Modernise the Experience, Not Just the Code

Technical upgrades alone do not fix confusing navigation, outdated visual design, slow workflows, or accessibility problems. The goal is to preserve business-critical functionality while making important tasks clearer, faster, and easier to complete.

UX audit

Establish where the current experience actually costs users time, with research where appropriate.

Information architecture

Rework navigation and user flows around the tasks people actually perform.

Wireframes & UI redesign

Modern visual design applied to real screens, not a generic template.

Design system

Reusable components so the modernised UI stays consistent as it grows.

Responsive layouts

Consistent behaviour across the device and OS range your users are actually on.

Accessibility & usability testing

Validate the redesign with real tasks before it ships, not after.

Performance modernisation

Make Your Existing App Faster and More Reliable

1Establish a baseline
2Identify bottlenecks
3Optimise highest impact first
4Test on representative devices
5Measure the result
App startup Screen rendering Memory usage Network requests API latency Database queries Image & media handling Caching Offline behaviour Background tasks Battery usage
We publish no before/after performance figures for your app until they have been measured on it. Performance improvements should be measured rather than assumed.
Security modernisation

Strengthen Security as You Modernise

Modernisation is an opportunity to identify and address security weaknesses that may have accumulated over years of incremental development. We prioritise controls according to the application's data, users, threat model, industry obligations, and business risk.
  • Authentication
  • Authorization
  • Secure token handling
  • Encryption
  • Secure local storage
  • API protection
  • Dependency vulnerabilities
  • Secrets management
  • Logging
  • Permissions
  • Session management
  • Data access controls
Cloud, infrastructure & data

Modernise What Sits Behind the App

Mobile modernisation usually requires improvements to the backend and infrastructure supporting the application — and to the data flows underneath both.

Cloud & infrastructure

Cloud services Databases Object storage CDN Load balancing Queues Caching Monitoring Logging Backups CI/CD Environment management Disaster recovery planning

Goal: an operational foundation that is observable, maintainable, and appropriate for current and expected product scale.

Data & database integration

Data assessment Schema review Data mapping API-based access Migration planning Data transformation Synchronisation Validation Backup & rollback planning

Principle: protect data integrity and define migration validation before changing production data flows.

Testing & quality

Modernise With Confidence

Modernisation introduces change. A strong testing strategy reduces the risk of breaking business-critical workflows while new architecture and dependencies are introduced.

Testing coverage

Unit, integration, API, UI, regression, device, OS, performance, security, accessibility, and migration validation.

Critical journeys

Authentication, core transactions, payments, search, booking, forms, notifications, synchronisation, data export/import, and user permissions.

Migration validation

Verify data integrity and behaviour against the pre-migration system before the old path is retired.

Release & observability

Make Releases Safer and Know What Happens in Production

Manual release processes slow modernisation and increase deployment risk. Shorter feedback loops and production visibility let you detect problems earlier, understand root causes faster, and prioritise improvements using evidence rather than opinion.

  1. Source control
  2. Automated builds
  3. Automated tests
  4. Environments
  5. Versioning & signing
  6. Approvals
  7. Release
  8. Rollback plan
What we monitor after release
Crash reporting Application logs API latency Error rates Infrastructure metrics Availability Key business transactions Alerts
Integration architecture

Create a Connected Digital Ecosystem

Integration should be treated as architecture, not a collection of isolated API connections — so the integration landscape stays clear and maintainable as systems change.
  • System boundaries
  • Source of truth
  • Data ownership
  • API contracts
  • Event flows
  • Authentication
  • Error handling
  • Retry behaviour
  • Idempotency
  • Monitoring
  • Versioning
Our process

A Structured Path From Legacy to Modern

1

Assess

Review the existing application, architecture, dependencies, integrations, data, security, UX, performance, infrastructure, and operational processes.

Output: assessment report
2

Prioritise

Identify business-critical risks, quick wins, modernisation opportunities, and areas that can safely wait.

Output: risk register
3

Plan

Define the target state, modernisation strategy, migration approach, milestones, dependencies, and rollback considerations.

Output: modernisation roadmap
4

Design

Create modern UX, architecture, API boundaries, data flows, security controls, and infrastructure design.

Output: target design
5

Stabilise

Fix critical bugs, security issues, release blockers, and observability gaps before major changes begin.

Output: stable baseline
6

Modernise

Refactor, upgrade, replatform, rearchitect, or replace selected components in controlled increments.

Output: modernised components
7

Integrate

Connect APIs, business systems, third-party services, data flows, notifications, and analytics.

Output: connected systems
8

Test

Validate functional behaviour, data integrity, performance, security, devices, integrations, and regression scenarios.

Output: validated build
9

Release

Deploy through controlled environments with monitoring and rollback planning.

Output: production release
10

Improve

Continue modernisation through a prioritised technical and product roadmap.

Output: ongoing roadmap
Migration & business continuity

Modernise Without Creating Unnecessary Business Disruption

Where continuous operations matter, modernisation can be phased so business-critical services stay available while components are replaced or upgraded.
Existing app keeps running
Modernised components go live in increments
Cutover
  • Dependency mapping
  • Feature prioritisation
  • Parallel operation
  • Data synchronisation
  • Rollback
  • Cutover planning
  • User communication
  • Monitoring
The migration strategy should match business criticality, acceptable downtime, data sensitivity, technical dependencies, and operational risk — there is no single correct cutover plan.
Why choose us

Modernisation With Product, Engineering, and Integration Thinking

Successful modernisation requires more than updating libraries. It requires understanding the business, users, architecture, data, integrations, and future product direction. We can work alongside your existing team and systems, or take ownership of a modernisation workstream from assessment through production.

Assess My Existing App
App audit UX/UI Native development Flutter React Native Backend & API Cloud Integration Data migration Security QA CI/CD Monitoring Maintenance
Case studies

Apps We've Built and Improved

Medix app

Healthcare Platform

Medix

A medical platform website with online booking, an admin panel and patient self-service — plus a companion booking and admin experience for the app side. Real, shippable proof of work built by our team.

ClinicFlow app

Clinic Booking App

ClinicFlow

Login and onboarding design for a clinic appointment booking app.

CMSD Indicator app

Market Analysis App

CMSD Indicator

Onboarding design for a market analysis and trading indicator app.

What Our
Clients Say

Highest rated with an average 4.92 out of 5.00 from 13 reviews

"We received exceptional service for our website redesign and digital marketing campaign. The team's professionalism, technical expertise, and commitment to quality exceeded our expectations."

"Their web development expertise is impressive. The project was completed on schedule, and the after-sales support has been outstanding. We look forward to working with them again."

"The app development team was professional and supportive. They understood our business needs and delivered a reliable application with all the required features."

"Their digital marketing strategies helped us increase our online inquiries significantly. The team was knowledgeable, responsive, and transparent throughout the campaign."

"Their website development team built a fast, secure, and mobile-friendly website for our clinic. We have received many positive comments from our patients."

"Excellent service from start to finish. Their digital marketing efforts improved our search rankings and generated quality business leads within a few months."

Engagement models

Flexible Modernisation for Different Levels of Complexity

We use proposal-based pricing here, because scope depends on application age, codebase size, dependencies, integrations, platform coverage, migration complexity, testing, and business-continuity requirements. Indicative bands for our other services live on the Pricing page.

FAQs

Have a question? We have the answer. If you don't see your question here, feel free to reach out to us.

What is app modernisation?

App modernisation is the process of improving an existing application's technology, architecture, UX, performance, security, integrations, infrastructure, or maintainability so it can better support current and future business needs.

Do you always recommend rebuilding an old app?

No. Refactoring, replatforming, incremental rewriting, rearchitecting, or a full rebuild may each be appropriate depending on the application's condition and business goals.

Can you modernise an app built by another company?

Yes. We can begin with a technical and product assessment before recommending the safest path forward.

Can you modernise Flutter or React Native applications?

Yes. Existing cross-platform applications can be assessed for framework, dependency, architecture, UX, performance, testing, and platform-compatibility improvements.

Can you modernise native iOS and Android apps?

Yes. Native applications can be upgraded, refactored, redesigned, integrated, or migrated based on their technical and business requirements.

Can you integrate our existing CRM or ERP?

Yes. Integration can be designed around available APIs, authentication, data ownership, workflows, security, and operational requirements.

How long does app modernisation take?

It depends on the codebase, platform, technical debt, number of integrations, scope, testing requirements, and migration strategy.

Can modernisation happen without taking the app offline?

Often, yes, through phased migration and controlled releases — but the appropriate approach depends on the system architecture and business-continuity requirements.

Do you provide post-modernisation support?

Yes. Support can include platform updates, dependency upgrades, bug fixes, performance optimisation, security improvements, monitoring, and new feature development.

Is Your Existing App Holding Your Business Back?

Let's assess what should be fixed, upgraded, integrated, replaced, or rebuilt — and create a practical modernisation roadmap around your business priorities.
Assess My Existing App
Share your current technology stack, app age, major problems, integrations, target platforms, and business goals. We'll help identify the right modernisation path.