How long does app modernization take?

It depends on scope. A UI/UX redesign typically takes 4 to 8 weeks. A targeted refactoring of core technical debt takes 2 to 4 months. A full architecture migration (monolith to microservices, on-premise to cloud) takes 4 to 9 months. We always start with the changes that deliver the most value fast

Is it cheaper to modernize or rebuild from scratch?

Modernization is almost always cheaper. Most apps have sound core logic buried under technical debt and outdated UI. Fixing those specific problems costs a fraction of a full rebuild. We only recommend a rebuild when the existing codebase is genuinely beyond saving, which happens in roughly 30% of t

Will modernization disrupt my live product?

Not if done correctly. We follow an incremental approach, upgrading components in stages rather than replacing everything at once. Your app stays live throughout the process. We use feature flags, staged rollouts, and thorough regression testing to ensure nothing breaks for your existing users.

Do I own the code after modernization?

Yes. You retain full ownership of all source code, infrastructure, and intellectual property throughout and after the engagement. We also provide updated documentation and handoff sessions so your internal team or a future partner can continue the work.

What does a codebase audit involve?

We review the architecture, code quality, test coverage, dependency health, security posture, and performance characteristics of your existing app. The audit takes 3 to 5 days and produces a written report with a prioritised list of issues and a recommended modernization roadmap. There is no obligat

Can you modernize apps built on outdated frameworks?

Yes. We regularly migrate apps from deprecated frameworks like AngularJS, Objective-C, older React Native versions, and legacy backend stacks. We assess whether incremental migration or a targeted rewrite of specific components is the most efficient path.

What happens after the modernization is complete?

We offer ongoing support retainers covering performance monitoring, bug fixes, security patches, OS compatibility updates, and iterative feature development. Modernization is not a one-time event. Your app needs continued care to stay healthy.

Can you add new features during a modernization project?

Yes, but we recommend fixing the foundation first. Adding new features to a codebase with severe technical debt means those features will inherit the same problems. We typically modernize in phase one, then add new capabilities in phase two once the codebase is clean.

How do I know if my app needs modernization or just maintenance?

If small changes take weeks instead of days, if your team spends more time fixing bugs than building features, if your app store rating is declining, or if you cannot hire developers willing to work on the codebase, those are signs of a modernization problem. Maintenance keeps things running. Modern

App Redesign & Modernization

Fix What Your Users Already Hate

You need app redesign and modernization you can trust with a product that is already live. Whether you want to modernize an app that is losing users, hire an app modernization company to tackle years of accumulated technical debt, or bring in experienced app modernization developers to rebuild what another team started, the question is always the same: can this be fixed without starting from scratch? We handle end-to-end legacy app modernization, covering app redesign services, codebase audits, architecture upgrades, UI/UX overhauls, and cloud migration. That means app redesign and modernization for startups that outgrew their MVP, scaling businesses hitting performance walls, and enterprise teams stuck on outdated technology. Ready for an app modernization quote? Tell us what needs fixing.

Start your project View our work

Executive Summary

App modernization typically costs between $25,000 and $200,000 depending on the scope of changes, technical debt severity, and architecture complexity. A UI/UX redesign alone takes 4 to 8 weeks. A full rebuild with architecture migration takes 3 to 9 months. Scope determines cost.

UI/UX Redesign

Fix the Experience First

If your users are dropping off during onboarding or complaining about navigation, this is usually the first thing to fix. User research is conducted, flows are remapped, interfaces are redesigned following current Material Design and Apple HIG guidelines, and tested with real users before shipping.

User research and flow remapping conducted
Interfaces redesigned following current design guidelines
Tested with real users before shipping

Start your project

app redesign and modernization team reviewing legacy codebase on screen

Technical Debt Reduction

Clean the Codebase

Technical debt is the silent killer of app performance and team velocity. It accumulates every time a shortcut is taken during development: skipped tests, hardcoded values, copied code, outdated dependencies. The codebase is audited, worst offenders prioritised, and systematically refactored.

Full codebase audit and prioritisation
Systematic refactoring of worst offenders
Goal is a codebase your team can actually work in

Start your project

legacy app modernization showing old and new UI side by side

Architecture Upgrade

Scale Without Breaking

If your app was built as a monolith and you are now struggling to scale, it can be re-architected into a modular or microservices-based structure. This improves reliability, makes it easier to deploy updates without downtime, and lets different teams work on different parts of the product independently.

Monolith to microservices migration
Migration from on-premise to AWS, Google Cloud, or Azure
Independent deployment for different teams

Start your project

dedicated app modernization developers collaborating on architecture upgrade

The Real Impact

Why It Matters

If your app is already live with real users, the stakes are higher than a new build. You cannot afford to break what works while fixing what does not. A botched modernization is worse than no modernization at all. The best modernization projects are incremental, measured, and tied to real user outcomes. The founders who get the most from this engagement are the ones who come in with a clear understanding of what is hurting them: slow performance, high churn, escalating maintenance costs. The ones who struggle are the ones who say 'just make it modern' without defining what that means. We help you define it. App modernization is not a one-time fix. It is an ongoing investment in the health of your product. Choosing the right technical partner means choosing someone who understands both the code and the business context behind it.

Industry Data

By the Numbers

93%

Of development teams report currently experiencing technical debt. Architecture debt is the most frequently cited form. If your app feels slow to update, you are not alone.

Source: Gartner Peer Community Survey, 2025

20-40%

CIOs estimate technical debt amounts to 20 to 40% of the value of their entire technology estate. That is real money sitting as unrealised risk.

Source: McKinsey Digital, 2023

39%

Operational cost savings achieved by organisations that address technical debt through modernization. This is the ROI case for not ignoring the problem.

Source: Simform / Industry Research, 2024

47%

Of IT leaders cite technical debt as a major contributor to overspending on cloud and digital infrastructure. The debt is not free. You are paying for it every month.

Source: IDC Research, 2025

50%

Faster service delivery times achieved by companies that actively manage technical debt, according to Gartner. Modernization does not just fix the past. It accelerates the future.

Source: Gartner, 2025

"The most expensive app is not the one you build wrong. It is the one you keep running wrong. Every month you delay modernization, the cost of fixing it goes up and the cost of maintaining it goes up too. The best time to modernize was six months ago. The second best time is now."

Techneth Engineering Team

Technologies

Our Tech Stack

Flutter

React Native

Swift

Kotlin

Firebase

Supabase

GraphQL

Node.js

Figma

AWS Amplify

Python

PostgreSQL

Our Process

How we turn ideas into reality.

Audit and Assessment

A full codebase audit, UX review, and architecture assessment is conducted. This takes 3 to 5 days and gives you a clear picture of what technical debt exists, what is worth keeping, and what needs to go.

Strategy and Roadmap

Based on the audit, a modernization roadmap is built that prioritises the changes with the biggest impact on user experience, performance, and maintainability. You see exactly what will be done, in what order, and why.

Iterative Rebuild

Work happens in sprints, tackling the most critical issues first. You see progress every two weeks. No disappearing for three months and returning with a surprise.

Launch and Support

The modernized app is deployed, performance is monitored, and ongoing support is provided for continued improvement.

Pricing

Investment Overview

Scope of Changes

A UI/UX redesign costs far less than a full architecture migration. Prioritising the changes that deliver the most value first is recommended.

Technical Debt Severity

An app with moderate debt needs targeted refactoring. An app with severe debt may need significant rewrites of core components.

Architecture Complexity

Monolith to microservices migration is a major undertaking. Re-platforming to the cloud adds infrastructure work.

Get a quote

Everything we do at Techneth is built around making data move reliably between the systems that matter. If you want to understand our approach before committing, you can read more about our team and how we work. Or explore the full range of digital product and development services we offer, like app redesign and modernization. And if you already know what you need, get in touch directly and we will find time to talk.

Frequently Asked Questions

Everything you need to know about this service.

How long does app modernization take?: It depends on scope. A UI/UX redesign typically takes 4 to 8 weeks. A targeted refactoring of core technical debt takes 2 to 4 months. A full architecture migration (monolith to microservices, on-premise to cloud) takes 4 to 9 months. Changes that deliver the most value fastest are always started first.
Is it cheaper to modernize or rebuild from scratch?: Modernization is almost always cheaper. Most apps have sound core logic buried under technical debt and outdated UI. Fixing those specific problems costs a fraction of a full rebuild. A rebuild is only recommended when the existing codebase is genuinely beyond saving, which happens in roughly 30% of projects assessed.
Will modernization disrupt my live product?: Not if done correctly. An incremental approach is followed, upgrading components in stages rather than replacing everything at once. Your app stays live throughout the process. Feature flags, staged rollouts, and thorough regression testing ensure nothing breaks for your existing users.
What does a codebase audit involve?: The architecture, code quality, test coverage, dependency health, security posture, and performance characteristics of your existing app are reviewed. The audit takes 3 to 5 days and produces a written report with a prioritised list of issues and a recommended modernization roadmap. There is no obligation to proceed after the audit.
Can you modernize apps built on outdated frameworks?: Yes. Apps are regularly migrated from deprecated frameworks like AngularJS, Objective-C, older React Native versions, and legacy backend stacks. Whether incremental migration or a targeted rewrite of specific components is the most efficient path is assessed.
What happens after the modernization is complete?: Ongoing support retainers are offered covering performance monitoring, bug fixes, security patches, OS compatibility updates, and iterative feature development. Modernization is not a one-time event. Your app needs continued care to stay healthy.