How much does legacy app modernization cost in Seattle?

Project costs vary based on scope and complexity. Typical legacy app modernization projects range from $15,000 for MVPs to $250,000+ for enterprise platforms. As a Seattle-serving team, we keep rates competitive by operating as a lean, senior-only agency. We provide a free consultation with a detailed quote.

What is your legacy app modernization process?

Our proven process includes: Legacy System Audit → Modernization Strategy → First Module Rebuild → Progressive Migration. Each phase has clear deliverables and stakeholder reviews, so Seattle businesses stay in control throughout the project.

What technologies do you use for legacy app modernization?

Our legacy app modernization stack includes Next.js, React, Node.js, TypeScript, Python, PostgreSQL. We choose technologies based on your project requirements, team capabilities, and long-term maintainability — not trends.

Do you work with startups in Seattle?

Yes. We work with businesses of all sizes in Seattle — from pre-seed startups building MVPs to enterprises modernizing legacy systems. Our flexible engagement models scale to match your budget and timeline.

How long does legacy app modernization take?

The first module is typically rebuilt and deployed in 6–10 weeks. Full modernization of a medium-complexity application takes 4–8 months. Large enterprise systems with dozens of modules can take 12–18 months. The incremental approach means you get value early and can adjust scope as you go.

How much does legacy app modernization cost?

First module rebuild: $25,000–$50,000. Full modernization of a medium application: $80,000–$200,000. Enterprise-scale modernization: $200,000–$500,000+. We scope based on the legacy audit and prioritize modules by business impact to maximize early ROI.

Legacy App Modernization Company in Seattle, WA

Legacy App Modernization in Seattle, WA

ZTABS delivers professional legacy app modernization for Seattle businesses — including incremental modernization, business logic preservation, data migration. Serving Cloud Computing, E-commerce & Retail Tech, AI & Machine Learning companies in Seattle, WA.

Start Your Project View Our Work

ZTABS provides legacy app modernization services in Seattle, WA — including incremental modernization, business logic preservation, data migration, and more. We work with Seattle businesses across Cloud Computing, E-commerce & Retail Tech, AI & Machine Learning using technologies like Next.js, React, Node.js.Get a free consultation →

Legacy App Modernization Capabilities for Seattle

Our legacy app modernization team delivers a full range of capabilities tailored to Seattle's Cloud Computing and E-commerce & Retail Tech sectors:

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Incremental Modernization
Modernize one module at a time — reducing risk, delivering value early, and keeping the business running throughout.
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Business Logic Preservation
We extract and document the business rules embedded in legacy code so nothing gets lost in the new system.
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Data Migration
Migrate from legacy databases (Access, FoxPro, SQL Server) to modern PostgreSQL or cloud-managed databases.
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API Layer Design
Build modern REST or GraphQL APIs that let the new system talk to legacy components during the transition period.
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Automated Testing
Create comprehensive test suites that verify the new system behaves identically to the old one for every critical workflow.
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Cloud Deployment
Deploy the modernized application on AWS, Azure, or Vercel with CI/CD pipelines, monitoring, and auto-scaling.

View all legacy app modernization capabilities →

Our Legacy App Modernization Process

1Legacy System Audit→2Modernization Strategy→3First Module Rebuild→4Progressive Migration→5Data Migration→6Decommission Legacy

Each phase includes clear deliverables and Seattle stakeholder reviews. See our full process →

Tech Stack for Seattle Legacy App Modernization Projects

Next.js React Node.js TypeScript Python PostgreSQL

See full technology details →

Why Seattle Businesses Choose ZTABS for Legacy App Modernization

Seattle (home to tech giants and a thriving startup ecosystem, population 740,000) is home to thriving Cloud Computing, E-commerce & Retail Tech, AI & Machine Learning sectors — each with distinctlegacy app modernization needs. Seattle companies build at scale — this is the city where AWS was born. Businesses here need cloud-native architectures, microservices, and systems that handle billions of requests. The gaming industry needs real-time multiplayer infrastructure. E-commerce companies need platforms that can handle Prime Day-level traffic spikes.

Seattle is home to Amazon, Microsoft, and the headquarters of some of the world's most influential tech companies. The city's engineering talent is among the best in the world, and its cloud computing expertise (AWS, Azure) is unmatched. The startup ecosystem benefits from deep technical talent and enterprise connections.

No state income tax, the highest concentration of software engineers per capita in the US, and direct connections to the world's largest cloud platforms. UW's computer science program consistently ranks in the top 10 nationally.

Legacy App Modernization for Seattle's Key Industries

Each of Seattle's core sectors has specific legacy app modernization requirements. We build solutions tailored to these industry needs:

Cloud Computing

Seattle's cloud computing companies need specialized legacy app modernization that addresses sector-specific compliance, integrations, and workflow requirements.

E-commerce & Retail Tech

Seattle's e-commerce & retail tech companies need specialized legacy app modernization that addresses sector-specific compliance, integrations, and workflow requirements.

Legacy App Modernization for E-commerce →

AI & Machine Learning

Seattle's ai & machine learning companies need specialized legacy app modernization that addresses sector-specific compliance, integrations, and workflow requirements.

Gaming

Seattle's gaming companies need specialized legacy app modernization that addresses sector-specific compliance, integrations, and workflow requirements.

How We Work With Seattle Businesses

Our distributed engineering team delivers the same quality and responsiveness as a local partner. No state income tax, the highest concentration of software engineers per capita in the US, and direct connections to the world's largest cloud platforms. UW's computer science program consistently ranks in the top 10 nationally.

Timezone-Aligned Availability

Our team schedules overlap with Seattle's Pacific Time (PT) business hours for real-time standups, reviews, and demos.

Dedicated Project Manager

A single point of contact who understands your business context and Seattle's market.

Transparent Communication

Daily async updates, weekly video calls, and shared project boards keep you informed at every stage.

Built for Seattle's Industries

We understand Seattle's key sectors — Cloud Computing, E-commerce & Retail Tech, AI & Machine Learning — and build solutions tailored to their requirements.

Frequently Asked Questions

Common questions about legacy app modernization in Seattle

We offer end-to-end legacy app modernization for Seattle businesses: incremental modernization, business logic preservation, data migration, api layer design. We use technologies like Next.js, React, Node.js to build solutions tailored to Seattle's key industries — Cloud Computing, E-commerce & Retail Tech, AI & Machine Learning.

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Legacy App Modernization

Learn more about our legacy app modernization services nationwide.

Next.js

Next.js transforms web applications into high-performance, SEO-friendly platforms that drive user engagement and boost conversion rates. Leverage its capabilities to streamline your development process and accelerate time-to-market, ensuring your business stays ahead of the competition.

React

Harness the power of React to accelerate your development process, enhance user experiences, and drive ROI. With its component-based architecture, React allows businesses to build dynamic applications that are both scalable and maintainable, ensuring long-term success in a competitive landscape.

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Legacy App Modernization Project?

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