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Legacy Modernization Services

Legacy Application Modernization Services.

Legacy modernization services with zero downtime — monolith to microservices, on-prem to cloud, Oracle to PostgreSQL, and legacy iOS apps rebuilt to current App Store requirements.

120+
Systems Modernized
99.9%
Uptime During Migration
60%
Avg Cost Reduction
4.9
Client Rating

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🔒NDA Protected
24hr Response
💬Free Consultation

Legacy application modernization services move ageing systems onto supported stacks without stopping the business. Codazz replatforms monoliths to cloud, migrates Oracle and SQL Server databases, wraps legacy APIs, and provides legacy iOS modernization development services for Objective-C and Swift apps that fail App Store review — incrementally, with rollback at every step.

Clutch Top Modernization Company 2026
AWS Migration Competency
SOC 2 Type II Certified
ISO 27001 Certified
Azure Migration Partner
Google Cloud Partner
Top IT Services - GoodFirms
Zero-Downtime Track Record
Clutch Top Modernization Company 2026
AWS Migration Competency
SOC 2 Type II Certified
ISO 27001 Certified
Azure Migration Partner
Google Cloud Partner
Top IT Services - GoodFirms
Zero-Downtime Track Record
Clutch Top Modernization Company 2026
AWS Migration Competency
SOC 2 Type II Certified
ISO 27001 Certified
Azure Migration Partner
Google Cloud Partner
Top IT Services - GoodFirms
Zero-Downtime Track Record

Why Legacy Systems Need Modernization Now

🔓

Security & App Store Risk

EOL frameworks receive zero patches. Legacy iOS apps built on deprecated APIs get rejected at review — every month of delay expands attack surface and blocks releases.

💸

Maintenance Cost Spiral

Legacy code costs 3–5× more to maintain than modern equivalents. Vendor lock-in, custom patches and shrinking talent pools drain engineering budgets every quarter.

⚠️

Integration Bottlenecks

Systems never designed for APIs turn every new partner integration into a multi-month project instead of a REST call.

Who Needs Legacy Modernization?

🏦

Financial Services

COBOL mainframes, monolithic banking apps and legacy trading platforms that cannot meet modern regulatory or API requirements.

🏥

Healthcare

Legacy EHR systems, HIPAA gaps and on-prem medical databases that need cloud migration without disrupting patient care.

🏭

Manufacturing & Enterprise

Ageing ERP systems and custom inventory platforms costing millions in maintenance and unplanned downtime.

🛒

Retail & Mobile-First Brands

Monolithic platforms and legacy iOS apps struggling with traffic spikes, slow releases and outdated payment integrations.

Modernization Impact

60-80%

Cost Reduction

Infrastructure savings

4-5x

Developer Productivity

Features per quarter

99.9%

Uptime

Post-modernization

80-95%

Fewer Incidents

Security improvements

75%

Faster Hiring

Modern stack appeal

10x

Faster Deploys

Monthly to daily

Legacy modernization is a business transformation, not a tech refresh. Codazz uses strangler-fig patterns and blue-green deployments to migrate incrementally — zero downtime, rollback at every phase, and measurable improvements within weeks.

How We Modernize

Legacy Modernization Services
Zero-downtime guaranteed.

From re-platforming and refactoring to full rebuilds and API-first modernization — we choose the right approach for each component of your system.

Why Codazz Modernization

Modernization That
Protects Your Business.

Zero-Downtime Guarantee

Strangler-fig patterns and blue-green deployments keep your business running at full capacity throughout the entire migration.

🔒

Data Integrity First

Parallel environments, real-time syncs and reconciliation reports before every cutover — no big-bang migrations.

📚

Knowledge Transfer Built In

Architecture decision records, runbooks and hands-on training included so your team owns the modernized system.

Trusted by Teams Building With
AWS
Azure
Google Cloud
Docker
Kubernetes
Terraform
PostgreSQL
MongoDB
Redis
Kafka
Datadog
PagerDuty
GitHub
GitLab
New Relic
Grafana
AWS
Azure
Google Cloud
Docker
Kubernetes
Terraform
PostgreSQL
MongoDB
Redis
Kafka
Datadog
PagerDuty
GitHub
GitLab
New Relic
Grafana
AWS
Azure
Google Cloud
Docker
Kubernetes
Terraform
PostgreSQL
MongoDB
Redis
Kafka
Datadog
PagerDuty
GitHub
GitLab
New Relic
Grafana
By the Numbers

Legacy Modernization Results
That Speak for Themselves.

120+
Systems Modernized
Across industries
99.9%
Uptime
During migration
60%
Cost Reduction
Average savings
10x
Faster Deploys
Post-modernization
4.9★
Client Rating
Across 70+ reviews
Advanced Technologies

Modernization Technologies
Built Into Every Migration.

We do not just build products — we engineer intelligent, connected, future-proof digital experiences.

🧩
Strangler Fig Pattern
Incremental migration without downtime or risk
🐳
Containerization
Docker and Kubernetes for portable, scalable workloads
📦
Infrastructure as Code
Terraform and Pulumi for reproducible environments
🔄
Blue-Green Deploys
Zero-downtime deployments with instant rollback
📊
Observability
Full-stack monitoring with Datadog and Grafana
🔐
Zero Trust
Modern security architecture for cloud-native apps
🧩
Strangler Fig Pattern
Incremental migration without downtime or risk
🐳
Containerization
Docker and Kubernetes for portable, scalable workloads
📦
Infrastructure as Code
Terraform and Pulumi for reproducible environments
🔄
Blue-Green Deploys
Zero-downtime deployments with instant rollback
📊
Observability
Full-stack monitoring with Datadog and Grafana
🔐
Zero Trust
Modern security architecture for cloud-native apps
📨
Event Sourcing
Event-driven architecture for microservices communication
🗃️
Data Pipelines
ETL and real-time streaming for data migration
🧪
Canary Releases
Gradual traffic shifting for safe deployments
🔗
API Gateway
Kong, AWS API Gateway for service orchestration
📋
Service Mesh
Istio and Linkerd for microservice communication
Serverless
AWS Lambda and Cloud Functions for event-driven workloads
📨
Event Sourcing
Event-driven architecture for microservices communication
🗃️
Data Pipelines
ETL and real-time streaming for data migration
🧪
Canary Releases
Gradual traffic shifting for safe deployments
🔗
API Gateway
Kong, AWS API Gateway for service orchestration
📋
Service Mesh
Istio and Linkerd for microservice communication
Serverless
AWS Lambda and Cloud Functions for event-driven workloads
Technology Stack

Legacy Modernization Stack.
40+ Migration Tools.

Best-in-class tools chosen for performance, reliability, and long-term maintainability.

Backend
Node.jsPythonGo.NET CoreJava (Spring Boot)Rust
Frontend
ReactNext.jsTypeScriptVue.jsAngular
Cloud & DevOps
AWSAzureGCPDockerKubernetesTerraform
Databases
PostgreSQLMongoDBDynamoDBRedisElasticsearch
Messaging & Events
KafkaRabbitMQSQS/SNSEventBridge
Monitoring
DatadogGrafanaPrometheusNew RelicPagerDuty
Selection Guide

How to Choose a Legacy Modernization Company

Choosing the right modernization partner is critical — one wrong migration can mean data loss or extended downtime.

📋

Proven Portfolio

Look for references with measurable results in monolith-to-microservices, cloud migration, and zero-downtime cutovers.

👨‍💻

Senior Engineers

8+ years avg experience. AWS/Azure/GCP, Docker, Kubernetes, Terraform, and legacy stack familiarity (COBOL, .NET, Java).

💲

Fixed-Price Quotes

No hourly surprises. Clear scope with phased milestones, rollback procedures, and data validation checkpoints.

🛡️

Post-Launch SLAs

Maintenance, monitoring, incident response, and uptime guarantees for modernized systems.

🔒

Security Certs

SOC 2, ISO 27001, HIPAA, PCI-DSS compliant. Zero-trust architecture and encrypted data migration.

🕐

Your Timezone

Dedicated PM, daily standups, sprint demos, and stakeholder alignment meetings.

FAQ

Legacy Modernization
FAQ.

Answers to common questions about legacy iOS modernization, cloud migration, monolith decomposition and enterprise system transformation.

Ask Us Anything

Legacy iOS modernization development services rebuild or replatform ageing iPhone and iPad apps — Objective-C to Swift, unsupported SDKs to current APIs, monolithic backends to cloud-native services — so the product passes App Store review and runs on supported iOS versions. The work is delivered incrementally with parallel environments and rollback at every cutover.

A targeted re-platform of one application takes 8–16 weeks. A full monolith-to-microservices programme for an enterprise system runs 6–18 months with phased rollouts. Every engagement starts with a 2–4 week assessment and pilot so you see working software before committing to the full scope.

Yes. We use strangler-fig patterns, blue-green deployments and incremental migration strategies that keep your existing system running while we build and cut over to the modernized version. Zero-downtime migration is a core requirement in every project we take on.

Cost depends on system complexity, component count, migration strategy and timeline urgency. A single-app re-platform sits at one end; a multi-system enterprise programme with change management at the other. We provide a cost-benefit analysis during assessment and a fixed-price quote with phased milestones before development starts.

Re-platforming moves your application to new infrastructure (e.g., cloud) with minimal code changes. Refactoring restructures the internal codebase for better performance and maintainability. Rebuilding means creating a new application from scratch using modern architecture while preserving business logic and data.

We audit the existing Objective-C or Swift codebase, map deprecated APIs to current equivalents, migrate UIKit screens to SwiftUI where appropriate, update push notification and background-task entitlements, and run TestFlight builds against Apple's latest review guidelines before submission. Backend APIs are wrapped or replaced in parallel so the app never loses data connectivity during the transition.

No. Data integrity is non-negotiable. We run parallel environments, perform incremental data syncs and execute comprehensive validation checks before any cutover. Every migration includes rollback procedures and data reconciliation reports.

Selected Projects

Latest Work

📱 Mobile Apps🌐 Web Platforms🤖 AI Products💰 FinTech🏥 HealthTech🛒 E-Commerce📚 EdTech🚚 Logistics🏠 Real Estate🎮 Gaming
📱 Mobile Apps🌐 Web Platforms🤖 AI Products💰 FinTech🏥 HealthTech🛒 E-Commerce📚 EdTech🚚 Logistics🏠 Real Estate🎮 Gaming
Web Design3D Animation
01

Rapida

Delivery Service Platform

A high-performance delivery platform with real-time tracking and immersive 3D visualizations.

UI/UXSecurity
02

Fynsec

Cybersecurity Dashboard

Enterprise-grade security dashboard with real-time threat monitoring and analytics.

E-CommerceCreative
03

Pallet Ross

Art Marketplace

A curated marketplace connecting artists with collectors worldwide.

Mobile DevFlutter
04

Rapida Mobile

iOS/Android App

Cross-platform mobile experience with live delivery tracking and notifications.

APIMicroservices
05

Fynsec API

Backend Infrastructure

Scalable microservices architecture handling millions of security events daily.

Admin PanelAnalytics
06

Pallet Ross Admin

CMS Dashboard

Comprehensive content management system with advanced analytics and reporting.

01 / 06

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Our Work

Products That Users Actually Love.

200+ products shipped across fintech, healthcare, e-commerce, and SaaS — built to scale, designed to convert.

Mobile App

FinTech Trading Platform

FinTech Startup

Results
2.1B+ Transactions
50ms Latency
4.8★ Rating
Technology
React NativeNode.jsAWS
Healthcare App

Telehealth Solution

Healthcare Network

Results
120+ Clinics
500K Consultations
HIPAA Certified
Technology
SwiftKotlinGCP
Mobile Platform

E-Commerce Marketplace

E-Commerce Brand

Results
85K MAU
28% Conversion
$12M GMV
Technology
FlutterGoMongoDB
Our Work Speaks

Products That Users 
Actually Love.

200+ products shipped across fintech, healthcare, e-commerce, and SaaS — built to scale, designed to convert.

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How We Work

From Idea to Launch
In 5 Proven Steps.

A battle-tested process refined across 500+ projects — giving you full visibility and zero surprises.

Agile Methodology
📋Fixed-Price Quotes
🔄2-Week Sprints
📊Weekly Reports
🎯8-Week MVP
🔒NDA Day 1
IP Ownership
🚀Post-Launch Support
📱iOS & Android
☁️Cloud Deployment
🧪QA Included
💬Daily Standups
Agile Methodology
📋Fixed-Price Quotes
🔄2-Week Sprints
📊Weekly Reports
🎯8-Week MVP
🔒NDA Day 1
IP Ownership
🚀Post-Launch Support
📱iOS & Android
☁️Cloud Deployment
🧪QA Included
💬Daily Standups
01

Discovery

We deep-dive into your vision, market, and technical requirements. You get a detailed scope, timeline, and fixed-price proposal — no surprises.

Requirements workshop
Technical scoping
Fixed-price proposal
1–2 days
02

Design

Our designers craft pixel-perfect wireframes and high-fidelity prototypes. You see exactly what you're getting before a single line of code is written.

Wireframes & user flows
High-fidelity UI
Prototype sign-off
1–2 weeks
03

Build

Agile sprints with weekly demos. You have full visibility into progress at every stage. Our engineers build clean, scalable, well-documented code.

Weekly sprint demos
CI/CD pipeline
Code review & QA
4–10 weeks
04

Launch

Zero-downtime deployment with full monitoring setup. We handle App Store submission, cloud infrastructure, and hand over everything — docs, credentials, source code.

App Store submission
Monitoring & alerting
Full handover
3–5 days
05

Scale

Post-launch SLA support, performance optimisation, and feature iterations. Most clients keep us as their dedicated engineering partner for the long term.

SLA-backed support
Performance tuning
Feature iterations
Ongoing
Market Intelligence

The Mobile App Market
Is Exploding.

📱 $522B Mobile App Market by 2027🚀 230B App Downloads/Year💰 $935B App Revenue by 2026📈 13.4% CAGR Growth🤖 AI in 75% of Apps by 2026🌐 6.3B Smartphone Users☁️ 90% Apps Use Cloud🔒 Cybersecurity Top Priority📱 $522B Mobile App Market by 2027🚀 230B App Downloads/Year💰 $935B App Revenue by 2026📈 13.4% CAGR Growth🤖 AI in 75% of Apps by 2026🌐 6.3B Smartphone Users☁️ 90% Apps Use Cloud🔒 Cybersecurity Top Priority
0+
Projects Delivered
Across web, mobile & AI
0+
Clients Worldwide
From startups to enterprises
0%
Client Retention Rate
Partners who stay long-term
0M+
Users on Our Platforms
Real users, real impact
$522B
App Market by 2027
Global mobile economy
230B
Downloads per Year
Consumer app installs
13.4%
CAGR Growth Rate
Fastest growing tech sector
6.3B
Smartphone Users
Addressable global audience
Why Choose Codazz

The Agency That
Actually Delivers.

Built for founders and product teams who need results — not promises.

500+ Apps Built99% Client Retention8-Week MVP100+ Engineers15+ CountriesFixed Price, No Surprises24/7 SupportNDA Day 1500+ Apps Built99% Client Retention8-Week MVP100+ Engineers15+ CountriesFixed Price, No Surprises24/7 SupportNDA Day 1

16+ Years Experience

From early-stage startups to Fortune 500s — we have seen every challenge and know how to navigate it.

100+ Engineers

Full-stack teams across mobile, web, AI, and cloud — ready to deploy on your timeline.

24 Countries Served

Global delivery with local understanding — we adapt to your market, culture, and timezone.

98% Client Retention

Clients stay because we deliver. Our track record speaks through repeat business and referrals.

SOC 2 Certified

Enterprise-grade security standards. Your data and IP are protected from day one.

8-Week MVP

From idea to live product in 8 weeks. Structured sprints, zero fluff, maximum momentum.

Start Your Project →
Security & Compliance

Enterprise-Grade Security
& Compliance Standards.

Every project meets the highest security and regulatory standards. Your data is protected at every layer.

🔒GDPR Compliant
🏥HIPAA Certified
SOC 2 Type II
💳PCI DSS Level 1
📋ISO 27001
🔐AES-256 Encryption
🕵️Penetration Tested
🏛️CCPA Compliant
🛡️Zero-Trust Architecture
🔑MFA Enforced
☁️AWS Security Hub
📡99.99% Uptime SLA
🔒GDPR Compliant
🏥HIPAA Certified
SOC 2 Type II
💳PCI DSS Level 1
📋ISO 27001
🔐AES-256 Encryption
🕵️Penetration Tested
🏛️CCPA Compliant
🛡️Zero-Trust Architecture
🔑MFA Enforced
☁️AWS Security Hub
📡99.99% Uptime SLA
GDPREU Data Protection Regulation

Full compliance with EU data protection laws. User consent management, data portability, and right-to-erasure built into every project.

CCPACalifornia Consumer Privacy Act

California privacy compliance with opt-out mechanisms, data disclosure workflows, and consumer rights management.

HIPAAHealthcare Data Compliance

End-to-end healthcare data protection. Encrypted PHI storage, audit trails, BAAs, and access controls for telehealth and EHR systems.

PCI DSSPayment Card Industry Standard

Level 1 PCI DSS compliance for payment processing. Tokenized card data, secure transmission, and quarterly vulnerability scans.

SOC 2Type II Security Certification

Independently audited security controls covering availability, processing integrity, confidentiality, and privacy.

ISO 27001Information Security Management

Certified information security management system covering risk assessment, incident response, and continuous improvement.

Client Testimonials

What Our Clients
Say About Us.

Hear directly from the founders and CTOs who've shipped with us.

4.9·500+ reviews on Clutch
4.9 / 5 on Clutch
🏆Top Rated on GoodFirms
150+ Happy Clients
🌍15+ Countries Served
💬500+ Verified Reviews
🚀200+ Apps Shipped
🤝95% Client Retention
📱Trusted by Fortune 500
4.9 / 5 on Clutch
🏆Top Rated on GoodFirms
150+ Happy Clients
🌍15+ Countries Served
💬500+ Verified Reviews
🚀200+ Apps Shipped
🤝95% Client Retention
📱Trusted by Fortune 500

They transformed our legacy system into a high-performance cloud platform. Technical depth is unparalleled — shipped in 10 weeks, zero bugs in production.

SJ
Sarah J.
CEO, Fintech Startup, San Francisco

The level of detail in their product design phase saved us thousands in development costs. A truly strategic partner — they think like founders, not vendors.

MD
Michael D.
Head of Product, Healthcare SaaS, Austin

Scaling to 500K concurrent users was a non-event with their architecture. Black Friday, not a single crash. I'm never going anywhere else.

AR
Alex R.
Founder, E-Commerce Platform, New York

We were struggling with a React Native app that kept crashing. The team rebuilt the entire architecture in 6 weeks — crash rate dropped to 0.01%. Absolute lifesaver.

PK
Priya K.
CTO, EdTech Series A, Dubai

Their team integrated real-time GPS tracking and route optimization into our fleet management system. Delivery times dropped 34% in the first month.

DL
David L.
VP Engineering, Logistics Corp, Chicago

From branding to a fully custom Shopify Plus build — they handled everything. Revenue tripled within 4 months of launch. The ROI speaks for itself.

NW
Nina W.
Founder, D2C Brand, Los Angeles

They transformed our legacy system into a high-performance cloud platform. Technical depth is unparalleled — shipped in 10 weeks, zero bugs in production.

SJ
Sarah J.
CEO, Fintech Startup, San Francisco

Join 150+ companies who've shipped with Codazz

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Global Engineering Network

One Team.
50 Locations. 24 Countries.

The best engineers from around the world, working virtually to build world-class software for every kind of builder.

Edmonton HQ
Chandigarh HQ
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0
Locations
0
Countries
0+
Engineers
Edmonton
HQ
Chandigarh
HQ
New York
US
Dubai
UAE
London
EU
Singapore
APAC
Let's Build Together

Your Vision Is One
Conversation Away.

Tell us about your project and we'll scope it, plan it, and build it — on time, on budget, every time.

See our portfolio for real client results.

NDA Signed on Day 1
Fixed-Price Guarantee
8-Week MVP Programme
Recognition & Certifications

Trusted, Verified &
Globally Recognised.

c.
Clutch Top Generative AI
2026
c.
Top App Development
2024
Webby Honoree
Webby Honoree
2024
Flutter Service Award
Flutter Service Award
2024
AWS Advanced Tier
AWS Advanced Tier
2024
AWS Cloud Ops
AWS Cloud Ops
2024
SOC II Certified
SOC II Certified
2024
ISO Certified
ISO Certified
2023
Red Herring 100
Red Herring 100
2023
c.
Clutch Top Generative AI
2026
c.
Top App Development
2024
Webby Honoree
Webby Honoree
2024
Flutter Service Award
Flutter Service Award
2024
AWS Advanced Tier
AWS Advanced Tier
2024
AWS Cloud Ops
AWS Cloud Ops
2024
SOC II Certified
SOC II Certified
2024
ISO Certified
ISO Certified
2023
Red Herring 100
Red Herring 100
2023