AARP Foundation
Tax relief applications now take 40% fewer clicks, on average.
We rebuilt 14 tools while the old ones kept running.
No disruption to the business you’re already runningNo disruption to the business you’re already running
Legacy System Modernization
Our 100% US-based engineers put new screens on the old software your business runs on, or replace it one piece at a time.
- Your in-house system
- Your AS400 application
- Your aging Rails or .NET app
- Your Access or FileMaker app
Trusted by teams at
Book a free call
30 minutes with Pete Whiting about the system your business runs on.
The Only Firm To Offer A Triple Guarantee
Guaranteed Price
The number we quote is the number you pay. Any overage is on us.
Guaranteed Outcome
The software works the way we agreed, or we fix it.
12-Month Warranty
For 12 months after launch, we fix any code that doesn’t work the way we agreed, at no charge.
Signs your old system is holding you back
Your team keeps spreadsheets next to it. New hires take months to learn it. Pulling data takes a developer. Every change feels risky.
New screens or a new system
New screens on the system you keep
When the old system still works and the screens are the problem. Each team gets screens made for its work. Your data stays where it is.
A new system next to the old one
We build a new system next to the old one and switch over one piece at a time. The old system keeps running until each new part is ready.
Case studies
Old systems we’ve modernized
Fitbit
We kept Fitbit’s legacy app running during its replacement.
That let Fitbit’s own team focus on the new platform. 100k+ Fitbit Plus clients moved to it.
Massachusetts Disabled Persons Protection Commission
An old registry rebuilt on time and within budget.
Delivered in 2023. 500+ organizations must check the registry.
4.8/5 from 20 verified reviews on Clutch
Our engineering team spent a fraction of their time (from many hours per week down to < 1 hour per week) supporting API customers.
Since Gnar started working with the AARP Foundation Property Tax-Aide, these digital tools have helped over 28,000 people apply for and, if eligible, obtain over $10M in property tax relief.
Work was accurately estimated and completed within the timeframes planned.
…they help make important business decisions; they acknowledge what I want to do but also help me understand the alternatives we have. In a nutshell, their thoughtfulness and communication have blown me away.
Our system is quite complicated, and Gnar was really able to be productive quickly without a lot of ramping up.
Delivery was on time and the team was responsive and professional during the entire process with weekly checkin meetings.
From the first conversation, Pete and Mike were open and curious about our project and, more importantly, about our company and how this project helped us help our clients.
…we ended up agreeing with 100% of their change requests because they were so well explained.
…they offered out great ideas, more efficient ways things could be done if applicable and were cost conscious. I would recommend them to anyone.
They care about the quality of their work, and the satisfaction of their clients. They take the time to understand what you are trying to achieve.
I would describe the engagement as highly successful.
They were really great partners, not only in getting the work done but also in helping us drive the software in the right direction.
I very rarely have to over-prescribe the work, Alex does a great job of listening to stakeholders which requires less work for me to best define a solution.
We like that they are a small, nimble company like we are, and that they are invested in our success.
It was always easy to work with the company founders, who went out of their way to meet our needs
The team also responds to pivots in priority very well and are willing to dig into problems with you to make sure the solution is right.
Future clients should trust them and take advantage of their extensive knowledge and expertise.
They did a good job of jumping in and learning the in’s and out’s of the application quickly to begin building right away.
Creative, timely, flexible, organized, personable, and strong technical skills.
They were able to advise us on good long-term approaches and strategies for frontend development.
What makes The Gnar Company different
100% US-based engineers
All development performed domestically with aligned hours, clear communication, and simplified data-security compliance.
Your business keeps running
Each switch is tested before your team uses it, and your team can go back to the old one.
You own the code
You get the code, its tests and written notes, so your team or another firm can take it over.
How we modernize your system
Step 1 · Discovery
Get a fixed-price build plan
Gnar Discovery and Design, from two weeks and $15,000. You get a written build plan with a fixed price. You keep it either way.
Step 2 · Rebuild
Build it in stages
We build one part at a time, with weekly demos and sign-off. You pay the price in your plan.
Step 3 · Maintain
Keep it running after launch
Optional hosting, monitoring and support from the people who built it, from $1,000 a month.
Common questions
How much does legacy system modernization cost?
Before Discovery, we can only give a range: builds usually run $150K to $300K+. Discovery ends with a fixed build price, and anything over that price is on us.
What if only one person knows how the old system works?
We read the old code, map its data and how your team uses it, and work out the rules nobody wrote down. The new code comes with tests and written notes, so the next change won’t depend on one person.
What happens to our data during the switch?
With new screens, your data stays where it is. With a new system, we move the data over piece by piece and keep it in sync while both run. For the Massachusetts Department of Early Education and Care, we moved 500K+ rows of data off a legacy system.
Can you modernize an AS400, Access, FileMaker, Rails or .NET app?
Yes. We read its code and map its data. Then we put new screens on the system you keep, or build a new one next to it and move the data over piece by piece.
Do you use AI to modernize the code?
Yes. Senior engineers read the old code with help from Gnar’s own AI tool. The rebuild is AI-assisted, with tests written for each part.
Who will be on my team?
A small senior team: engineers based in the U.S. and a product manager. No teams outside the U.S.
What kinds of companies do you work with?
Mostly mid-sized companies that sell to other businesses, where software runs the business. Many make, build, ship or distribute things.
Should our own engineers do this instead?
Often they should. If your engineers have the capacity and the direction, do it internally. We will say so on the call.
Tell us about your system
We talk through your system and whether it needs new screens or a new system.
Book a free call
30 minutes with Pete Whiting.
Book a free call
30 minutes with Pete Whiting about the system your business runs on.