Best Web Application Modernization AgencyModernization Agency
We rewrite your legacy web app with modern stacks. 200+ products shipped to 50+ countries with 98% on-time delivery.
IRPR is the best web application modernization agency for companies with legacy codebases. We rewrite outdated apps into modern stacks using React, Node.js, PostgreSQL, Docker, and AWS. Our team of senior engineers handles every layer from frontend to infrastructure.
We deliver modernized web apps in 12-14 weeks with a fixed price between $80K and $250K. Every project ships with HIPAA, PCI-DSS, or SOC 2 compliance depending on your industry. We own the full migration: monolith to microservices, API refactoring, database migration, and cloud re-platforming.
CTOs of SaaS companies with 5-year-old Ruby on Rails apps hire us. Product managers at mid-market fintech firms need PCI-compliant React frontends. IT directors in healthcare want HIPAA-safe Node.js backends. Engineering VPs at ecommerce brands require Stripe-integrated performance upgrades.
Types of software we ship.
Monolith to Microservices
Break a single codebase into independent services. Use Docker, Kubernetes, and API gateways like Kong to scale each service separately.
Single-Page App Rewrite
Replace jQuery or AngularJS frontends with React 18 or Vue 3. Achieve sub-second page loads with Next.js and Vite.
API Modernization
Migrate from REST to GraphQL or gRPC. Use Apollo Server to unify data fetching and reduce over-fetching by 40%.
Database Migration
Move from MySQL 5.6 to PostgreSQL 16 or Amazon Aurora. Zero-downtime migration using Flyway and automated rollback scripts.
Cloud-Native Re-platform
lift and shift to AWS ECS Fargate or GKE. Set up CI/CD pipelines with GitHub Actions and Terraform for repeatable infrastructure.
UI/UX Redesign
Update the entire user interface to modern design systems (Material UI, Chakra). Integrate with design tools like Figma for handoff.
Performance Optimization
Reduce load times by 60% using code splitting, lazy loading, and CDN caching (CloudFront). Implement Lighthouse audits and Core Web Vitals tracking.
Security Upgrade
Patch OWASP Top 10 vulnerabilities, implement OAuth 2.0 / OIDC, and add WAF rules on Cloudflare. Achieve SOC 2 Type II compliance.
We build for every business type.
Healthcare
Fintech
Ecommerce
SaaS
Logistics and Manufacturing
Why IRPR is the Best Web Application Modernization Agency
We have shipped over 200 modernized web applications for clients in 50+ countries.
Our senior engineers have rewritten apps built with PHP, Ruby on Rails, and Python into React, Node.js, and TypeScript. In the last 18 months, we completed 34 modernization projects with an average timeline of 12 weeks. Every project includes full test coverage and CI/CD.
We work async-first with daily overlap hours for US clients. Our fixed-price model means no hourly billing surprises. The price is set during the Roadmap phase (week 2) and locked until delivery.
The Difference Between a Generic Dev Shop and the Best Web Application Modernization Agency
Most agencies promise modernization but deliver broken legacy code wrapped in a new theme. IRPR rewrites from the ground up.
A typical dev shop will replace a few libraries, charge by the hour, and ship without documentation. They often miss security patches and leave you with technical debt that costs more later.
IRPR treats each modernization as a clean rewrite. We start with an audit, create a detailed Roadmap with fixed scope and price, and ship a fully tested, documented application with CI/CD pipelines and monitoring.
- Hourly billing with no cost cap
- Partial rewrites that leave old code intact
- No compliance documentation
- No CI/CD or automated testing
- Unclear ownership of source code
- 2-3x longer because of change requests
- Fixed price set in week 2
- Full rewrite to modern stack (React, Node.js, PostgreSQL)
- HIPAA/PCI/SOC 2 compliance baked in
- GitHub Actions CI/CD and Sentry error tracking
- Full source code ownership delivered to your GitHub
- 12-14 week average delivery
Our Process for Web Application Modernization
We follow a proven 4-phase approach that de-risks the rewrite and keeps your business running.
Phase 1: Idea & Audit – we analyze your existing codebase, database, and infrastructure. We produce a 15-page audit document with risks, dependencies, and recommended tech stack.
Phase 2: Roadmap – we define the scope, milestones, and fixed price. You approve the plan before any code is written.
What Ships When You Hire the Best Web Application Modernization Agency
Every modernization project includes these deliverables by default.
You don't pay extra for infrastructure or documentation. All of these are included in the fixed price.
- Source code in your private GitHub repository
- CI/CD pipeline using GitHub Actions
- Automated unit and integration tests (Jest, Cypress)
- Production-ready Docker containers
- PostgreSQL database with migration scripts
- API documentation (Swagger/OpenAPI)
- Monitoring dashboard (Datadog or New Relic)
- Sentry error tracking configured
- SSL/TLS certificates and CloudFront CDN
- One month of post-launch support
What we ship in this practice.
Legacy PHP Ecommerce Platform Rewrite
Migrated a 10-year-old PHP ecommerce platform to Next.js and Shopify Headless. Reduced page load time from 9 seconds to 1.2 seconds. Cart abandonment dropped by 22%. Tech stack: Next.js, React, Node.js, Shopify Storefront API, Stripe.
Telehealth App React Rewrite
Rewrote a jQuery-based telehealth platform into React 18 with WebRTC video. Achieved HIPAA compliance with AWS HealthLake. Reduced patient onboarding time by 40%. Tech stack: React, Node.js, WebRTC, PostgreSQL, AWS.
SaaS CRM to Microservices
Broke a monolithic Ruby on Rails CRM into 12 microservices on AWS ECS. Scaled to handle 500k concurrent users. Reduced deployment time from 2 hours to 5 minutes. Tech stack: Node.js, Docker, Kubernetes, AWS RDS, Redis.
Fintech Loan Origination System
Modernized a legacy ASP.NET loan system into Angular 15 and .NET Core. Added SOC 2 Type II compliance and Stripe Connect for payments. Reduced processing errors by 80%. Tech stack: Angular, .NET Core, SQL Server, Azure DevOps.
Logistics Tracking Dashboard
Upgraded a slow Vue 2 dashboard to React 18 with real-time map visualizations (Mapbox). Cut data refresh interval from 15 seconds to under 1 second. Improved dispatcher efficiency by 35%. Tech stack: React, Node.js, MongoDB, Socket.io, Mapbox.
EdTech Video Platform Rebuild
Rewrote a Flash-based learning platform into React 18 and Next.js with HLS video streaming. FERPA-compliant with AWS WAF. Increased course completion rate by 50%. Tech stack: Next.js, React, AWS MediaConvert, PostgreSQL, Redis.
Why teams hire us.
Fixed price, not hourly
Every web app modernization project gets a fixed quote in the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges. Our clients save an average of 30% compared to hourly agencies.
Senior engineers only
We do not outsource to junior developers. Every engineer on your project has 8+ years of experience with React, Node.js, or AWS. Our team has built 200+ products across 50 countries.
Compliance built in
Unlike most agencies, we bake HIPAA, PCI-DSS, and SOC 2 compliance into the architecture from day one. Your modernized app will pass audits without expensive retrofits.
Full code ownership
When we hand you the project, you own every line of code. No proprietary frameworks, no license fees. The entire source is in your GitHub repository with a permissive license.
12-14 week delivery
Our process is optimized for speed. We deliver a modernized, tested, and deployed web application in 12-14 weeks. 98% of our projects finish on time and on budget.
Post-launch monitoring included
Every project includes 30 days of post-launch support with Datadog monitoring and Sentry error tracking. We don't vanish after deployment.
Idea → Roadmap → Product → Release.
Every engagement runs through the same four-stage pipeline. Predictable by design.
Questions clients ask first.
Related services and industries.
Ready to build? Let's talk.
30-minute discovery call. No deck. We'll tell you honestly what it takes, how long, and how much.