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Replatforming onto modern infrastructure

Replatforming

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.

What we decideLegacy systemWhat happens to each partDataMoveWorkflowsModernizeOld codeRetireThe order to do it inReplatform planDiscovery and stabilizationDoneRebuild while maintainingBuildingNew featuresNextModern platformTesting, security and scalability built inTestingSecurityCI/CD pipelineYour dataDataWhat we decideLegacy systemDataMoveWorkflowsModernizeOld codeRetireThe order to do it inReplatform planDiscovery and stabilizationDoneRebuild while maintainingBuildingNew featuresNextModern platformTesting and security built inTestingSecurityYour dataData

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

Every part of the old system gets a decision.

Legacy databaseManaged databaseRecords migratedRecordsMappedRecordsMovedUsersMappedUsersMovedMigrate
Legacy databaseManaged databaseRecords migratedRecordsMappedUsersMappedRecordsMovedMigrate

What to move

We map the system, its data and its workflows, then move what the business still needs onto the modern platform.

Built in from the first commitTestingIntegrated testsSecurityVulnerabilities closedDeploysCI/CD pipelineAccessibilityADA requirements
Built in from the first commitTestingIntegrated testsSecurityVulnerabilities closedDeploysCI/CD pipeline

What to modernize

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.

Moves to the new platformRecordsMoveBusiness logicRebuildStays behindOld codeRetireWorkaroundsRetire
Moves to the new platformRecordsMoveBusiness logicRebuildStays behindOld codeRetireWorkaroundsRetire

What to retire

Old code and the workarounds built around it stay behind, so the new platform does not inherit the old problems.

Existing toolsStill runningReplacementsTaking shapeRebuild while maintaining
Existing toolsRunningReplacementsBuildingRebuild while maintaining

The order to do it in

We work in phases and keep the existing tools running while their replacements take shape.

Two ways in

Modernize or replatform?

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.

Keep the code

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.

Audit of the existing codebaseTestingMissingSecurityGapsScalabilityLimitedExisting codebaseKept when it can carry the work
Audit of the existing codebaseTestingMissingSecurityGapsScalabilityLimitedExisting codebaseKept when it can carry the work
Replatform

Rebuild on modern infrastructure

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.

Legacy systemModern platformPhase 1Phase 2Phase 3DataWorkflowsFront endThe business keeps running
LegacyModernPhase 1Phase 2Phase 3DataWorkflowsFront endThe business keeps running

Proof

Our work

Legacy replatform

Replatforming the tools that help seniors save on property taxes

40%fewer clicks to complete an application, on average
14tools rebuilt on React and Ruby on Rails
Read case study
See all our work

How it works

How we’d work with you

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.

Legacy systemWe map it firstDataWorkflowsCode
Legacy systemWe map it firstDataWorkflowsCode
Step 1 · From two weeks

Diagnose the right path

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.

Discovery and stabilizationDoneRebuild while maintainingBuildingNew featuresNext
StabilizeDoneRebuildBuildingNew featuresNext
Step 2

Modernize

We build the experience layer or replatform, phase by phase, starting with the highest-impact workflow. Delivered under the full triple guarantee.

Support requestDoneWarranty fixDoneNew featureIn progress
Support requestDoneWarranty fixDoneNew featureIn progress
Step 3

Keep it running

Ongoing support and feature work on the modernized system, on a pre-negotiated monthly retainer. Optional, never required.

Our record

Why Gnar?

Common questions

Frequently asked questions

Still have questions?

What does modernization mean here, overlay or replatform?

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.

Will you replace my system?

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.

My vendor is ending support or forcing a migration. How soon should we start?

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.

Have you done this before?

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.

How is this priced?

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.

Why pay for Discovery instead of getting a quote?

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.”

Can The Gnar integrate with my existing software and APIs?

Yes. The Gnar builds integrations with your existing systems, third-party APIs, and SaaS tools.

How does The Gnar ensure scalability and future-proofing?

By using scalable cloud platforms, modular architectures, and best practices in DevOps and development, The Gnar ensures long-term reliability.

What is the triple guarantee, and what does it cover?

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.

What does the 12-month warranty cover?

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.

Who will be on my team?

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.

What happens after launch? Are we locked in?

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.

Legacy systemMapped and priced before the build startsArchitectureDataVendorBusiness
Legacy systemMapped and priced firstArchitectureDataVendorBusiness

Start here

Start with a fixed-price diagnosis.

Two weeks, $15,000, and you walk out with a build plan that has a fixed price on it.

Talk to us about modernization

Let’s Talk

Contact Us

Tell us what you’re trying to build or fix.