Rebuild on top of the existing codebase
When the existing code can carry the work, we stabilize it and build on top of it. The audit says whether it can: testing, security and room to scale.
Replatforming onto modern infrastructure
What to move, what to modernize, what to retire, and the order to do it in. You land on a modern platform, not a hosted copy of your legacy problems.
Every engagement starts with a fixed-price diagnosis, from two weeks and $15,000.
The old system keeps running while its replacement takes shape. You land on a modern platform with testing, security and scalability built in from the first commit.
Fixed milestone price
Any overage on us
Guaranteed outcome
The software works as specified or we fix it
Twelve-month bug-free warranty
Three commitments on every build engagement
What changes
We map the system, its data and its workflows, then move what the business still needs onto the modern platform.
The audit shows where the existing code falls short. The rebuild has testing, security and a CI/CD pipeline built in from the first commit.
Old code and the workarounds built around it stay behind, so the new platform does not inherit the old problems.
We work in phases and keep the existing tools running while their replacements take shape.
Two ways in
The path gets decided during Discovery, based on the system’s architecture, how reachable its data is, the vendor’s lifecycle, and where the business is headed. The recommendation fits the system, not our pipeline.
When the existing code can carry the work, we stabilize it and build on top of it. The audit says whether it can: testing, security and room to scale.
When the legacy stack can’t be salvaged, or the vendor is forcing the move, we rebuild on modern infrastructure with the same milestone pricing and guarantee as a custom build.
Proof
Legacy replatform

How it works
Some legacy systems can be saved. Others have to be replaced. We figure out which, then we build it. Every engagement starts with a fixed-price diagnosis before you commit to the work.
We map the system, the data, and the workflows, decide between an experience-layer overlay and a full replatform, and produce a phased implementation plan with guaranteed pricing for the build.
We build the experience layer or replatform, phase by phase, starting with the highest-impact workflow. Delivered under the full triple guarantee.
Ongoing support and feature work on the modernized system, on a pre-negotiated monthly retainer. Optional, never required.
Common questions
Still have questions?
Both. An overlay builds a modern, role-based experience on top of your existing system of record, which stays in place. A replatform rebuilds the system on modern infrastructure when the old stack can’t be saved. We decide which fits your system during a fixed-price Discovery, based on the architecture, the data, and your vendor’s lifecycle.
Only if that’s genuinely the right call. Often it isn’t. If the underlying system still runs the business reliably and the real problem is the interface, an experience layer on top delivers most of the value at a fraction of the cost and risk of a full replacement.
Sooner than the deadline suggests. Discovery takes 4 to 8 weeks and implementation runs several months, so starting well before the cutoff lets you modernize on your terms instead of under pressure. The systems forcing these decisions vary, but the clean approach is the same: plan early, build in phases.
Yes. Ten years and 100+ projects across operational software, including modernization work live in production today. Our senior US team has already solved the hard problems here: integrating with legacy systems, synchronizing data, and building role-based interfaces on top of systems that can’t be taken offline.
Discovery is a fixed price with clear deliverables. Implementation runs on fixed milestones under the full triple guarantee: the price holds, the outcome is guaranteed, and the build carries a 12-month bug-free warranty.
A quote without discovery is a guess, and guesses are how modernizations run over budget. Discovery produces a real implementation plan and a price we can guarantee. As one client put it after the fact, “I wish we would have spent more time in discovery and requirements mapping up front.”
Yes. The Gnar builds integrations with your existing systems, third-party APIs, and SaaS tools.
By using scalable cloud platforms, modular architectures, and best practices in DevOps and development, The Gnar ensures long-term reliability.
Three commitments on every build engagement: a fixed milestone price, a guaranteed outcome (the software works as specified or we fix it), and a 12-month bug-free warranty. It covers the projects we run. It does not cover staff augmentation, because in that case we are reinforcing your team rather than running the project.
For a full year after delivery, we repair any non-conforming code at no charge. The warranty covers code that doesn’t work as specified. Feature additions and ongoing operational support are handled separately through our monthly support retainer.
A small team of senior US-based engineers and a product manager, covering web development, mobile development, and UI/UX design in-house. No offshore teams, no junior developers staffed on after a senior pitch.
The codebase is yours, in your repository, documented for hand-off. The 12-month warranty obligates us to fix non-conforming code, independent of any ongoing contract. Our monthly support retainer is available for clients who want it and is never a requirement.
Start here
Two weeks, $15,000, and you walk out with a build plan that has a fixed price on it.
Talk to us about modernization