Legacy application modernization
Legacy application modernization without stopping the business.
The old system still runs payroll, orders or client records, and everyone is afraid to touch it. Legacy application modernization rebuilds it on modern, supported code in planned phases, keeping your data and the workflows your team relies on, so the business never stops while it moves.
Our work · StackOS
The problem
The system nobody can replace is the one that will fail.
Old software rarely breaks all at once. It gets slower, the one person who understands it gets busier, it stops working with newer tools and every security update becomes a gamble. Meanwhile the business keeps adding workarounds on top.
Modernizing doesn't have to mean a risky big-bang switch. We document what the system really does, move the data carefully and replace it piece by piece, running old and new side by side until your team is ready.
What changes for you
What legacy application modernization should protect.
Every record kept
Your data mapped, cleaned and moved, then checked against the old system before anything is switched off.
Workflows your team knows
The steps that work today carried over, so people aren't relearning their whole job.
Supported, secure code
A modern, maintained stack that gets security updates and hires easily.
Ready to connect
APIs and integrations the old system could never offer.
What you get
How our legacy software modernization works
Careful, phased and reversible until you say it's done.
- 01
System audit
We document what the software does, who uses it, where the data lives and what depends on it.
- 02
Modernization plan
Rebuild, replace or wrap with an API: a written plan that names what moves first and why.
- 03
Data migration
Records mapped, cleaned and imported, with test runs and checks against the old numbers.
- 04
Phased rebuild
Modules rebuilt one at a time on modern code, running alongside the old system until each is proven.
- 05
Training and cutover
Your team trained on each piece before the switch, with the old system on hand until you're confident.
- 06
Ongoing support
Hosting, monitoring and improvements from the team that built the new system.
Proof
Work we're proud of.
- Application
Professional Services
StackOS
We built the software that runs our own business.
ApplicationArchivedGovernment Program
NNCEPP
A public website and a custom CRM, built to launch a city eviction prevention program on a tight deadline.
ApplicationRestaurants and Hospitality
Reno Restaurant Guide
A city's dining guide, built as a platform restaurants subscribe to.
ApplicationSoftware
Stack Guard
A WordPress security product, from plugin to licensing to marketing site.
ApplicationConsumer Software
TribeStack
A family app for chores, schedules and allowance, built on a secure multi-household platform.
ApplicationSoftware
Style Stack
A visual CSS framework builder that turns brand choices into a design system.
WebsiteReal Estate
Nevada Estate Property
A real estate site built for people who inherited a property they never planned to sell.
WebsiteMultifamily
Next Level Property Management
Portfolio up 600% after launch: six times as many units as before.
WebsiteReal Estate
Western Nevada Management
A website that runs the business, and won a Web Excellence Award for design and functionality.
Why Stack Mode
We modernize systems people have used for decades.
A green-screen system, rebuilt
For a CPA practice licensed in Nevada and California, we're replacing the System/36 style accounting software its founder wrote with a modern platform, one module at a time. The founder asked to keep the green screens, and for an accountant's heavy data entry they're often faster: every module also runs as 80 by 24 screens driven entirely from the keyboard, one key away from the modern version.
A patchwork replaced
StackOS replaced a separate CRM, proposal tool, project manager, invoicing app, accounting software and client portal at Stack Mode, and it imports books from QuickBooks, Xero and Sage.
Plain answers first
Sometimes the right move is to keep the old system and connect it. We'll say so before you spend a dollar on a rebuild.
How we work
Five steps. One team. No surprises.
Fixed pricing and a clear plan before we start, and you see the work at every stage.
Strategy
01We learn the business, the customer and the goal, then map the pages, features and content that will move the numbers.
Design
02A custom design for your brand, reviewed with you screen by screen until it feels right. No templates.
Build
03Clean, fast code, built to rank and to last. Applications get tested with real data before anyone relies on them.
Launch
04Redirects, tracking and speed checked before go-live, so nothing you already earned is lost in the move.
Grow
05Hosting, care and marketing after launch, so the site keeps getting better instead of going stale.
Our stack
Tools we trust for this work.
Every tool is one we use on real client projects. Tap any of them for our take.
Client reviews
Don't take our word for it.
4.9
Google rating
They really got to know us and incorporated our ideas into our website perfectly. In addition to our new website, they developed an amazing CRM to help streamline our workflow!
TTT. TranNNCEPP Chris and the team at Stackmode absolutely nailed our Nevada Estate Property website. I've been in real estate for over 20 years and have seen a lot of websites. This is honestly the best I've seen.
RBRyan BordenNevada Estate Property Started a very big project with Chris back in April. We just completed the project and I couldn't be more impressed with his skill, professionalism and patience.
JDJeff DavidsonReno Restaurant Guide We've had an increase of people asking about our site, our business has increased substantially. The communication is phenomenal and the budget is right on target!
DLDon LamersWestern Nevada Absolutely could not be more impressed with this company. They took my idea, created an amazing website, and provided exceptional customer service. Very modern, clean, and professional!
CGChad GrayotBio Sealed Stack Mode was able to assist me with creating a robust website with powerful marketing messages. I wouldn't just lightly recommend Stack Mode, I am an advocate for their high-quality work!
EAElias AstutoeXp Realty
They were very helpful, accommodating, knowledgeable, and quick to respond! We would recommend them to anyone needing website help or marketing services. Thank you, Stack Mode!!
SSSamantha SamuelsonBlack Eagle Consulting Great work on our website and very good with communication! It's great to have a team you can count on. We highly recommend Stack Mode Marketing Group!
DMDarik MerbachBooked Out First class marketing and design services. Recommend them to anyone needing a website, marketing assistance, or even just a logo. They will go out of their way to please.
WBWilliam BloomerWilliam R. Bloomer, CPA I found Chris and his staff at Stack Mode Marketing Group to be very professional, helpful, friendly, and knowledgeable with all aspects of their services in supporting our company goals.
AMAlex MalavazSurviveIt2 Stack Mode Marketing Group did a great job of creating our website. We would recommend Stack Mode Marketing Group to anyone who is looking to create a customized website!
RBRoxanne ButlerMyan Management Group Chris Foti really knows his business. He provided excellent advice to us today and he was very generous with his time!
JRJen Rosser
FAQ
Legacy Modernization questions, answered.
What is legacy application modernization?
How do you avoid downtime during modernization?
Will we lose any data?
Should we rebuild or replace our legacy system?
Can you work with software another company wrote?
What does legacy modernization cost?
Keep exploring