Migrate site to React — without re-launching your site
Old stack out, new stack in — without a re-launch
- Senior engineers · IST + EST overlap
- NDA on day 1
- 24-hour reply
Tell us what you need fixed
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Migrate site to React — done properly, by senior engineers
Migrating a legacy front end to React fails most often not on the code but on the cut-over: a big-bang rewrite that ships months late, drops SEO, and breaks features nobody remembered to test. We migrate the safe way — route by route, using the strangler-fig pattern, with the old and new stacks running side by side behind a router until each section is proven. That means no launch-day cliff, SEO and analytics parity verified at every step, and your team shipping features in parallel instead of freezing the roadmap for a quarter. We start with the highest-value or highest-risk routes, keep every change behind a pull request you review, and finish with a clean decommissioning checklist so the legacy code actually goes away.
What you're seeing
You're on a legacy stack (jQuery, Knockout, Angular 1) and every change is risky and slow.
Our approach
We migrate route-by-route to React using the strangler-fig pattern. No big-bang launch, no SEO disruption, full team enablement at the end.
Symptoms teams come to us with
- A legacy stack where every change is risky and slow
- Poor SEO and slow first paint from a client-only SPA
- Hiring is hard because nobody wants the old framework
- A big-bang rewrite has stalled or scares everyone
How we de-risk it
- Route-by-route strangler-fig migration, no big-bang launch
- SEO and data parity verified at every step
- Feature flags so old and new run side by side
- A clean decommissioning checklist for the old system
Concrete deliverables, no fluff
Every engagement ends with measurable, documented outcomes — no black-box agency reports.
- Migration plan with route-by-route mapping
- Incremental cut-over, no big-bang launch
- Data + SEO parity verified at every step
- Decommissioning checklist for the old system
What changes after we ship
No big-bang launch
Old and new run side by side behind a router; each route is migrated and verified independently, so there is never a single risky cut-over.
SEO and analytics parity
URLs, metadata, structured data and tracking are checked at every step, so rankings and reporting carry over rather than reset.
A roadmap that keeps moving
Your team ships features during the migration instead of freezing for months — the migration runs alongside, not instead of, product work.
A clean exit from the old stack
A decommissioning checklist ensures the legacy code is fully retired, not left half-alive to rot.
From brief to shipped fix
A transparent, low-risk process — a senior engineer reads your brief personally, and nothing starts until you approve a written plan and price.
01
Diagnose
A senior engineer reviews your brief, reproduces the issue, and pinpoints the real root cause — not the symptom — before any code is touched.
02
Scoped plan & quote
You get a written plan to migrate Site to React, a firm timeline, and a fixed quote. Nothing starts until you approve it — no surprise invoices.
03
Ship the fix
We implement on a branch and open a pull request you review, working to your code-review standards on your repo — never a black box.
04
Verify & hand off
We verify on staging and production, share before/after evidence where it applies, and leave you a short hand-off note so the fix sticks.
Situations we handle
Off jQuery, Angular 1 or server templates
A legacy front end where every change is slow and risky. We modernise it incrementally to React + TypeScript.
A slow SPA that Google indexes poorly
We migrate toward SSR/SSG where it helps, recovering both performance and crawlability.
A stalled rewrite
A big-bang rewrite that has lost momentum — we restart it as a safe, incremental, ship-as-you-go migration.
Why teams hand this task to Krapton
Senior engineers only
Your brief is read and handled by a senior engineer — no junior hand-off, no sales-rep filter in between.
Root cause, not a patch
We reproduce and fix the underlying cause, then add a guard so the same class of issue does not quietly return.
Your repo, your standards
Every change lands as a pull request you review, on your repository, following your existing review process.
NDA on day one
Confidentiality and IP are covered before we look at a single line of code. All work stays in your accounts.
Fixed quote up front
You approve a written plan and price before work starts. If scope changes, we re-quote in writing — no surprise invoices.
Proof, where it applies
Performance, SEO and reliability work ships with before/after evidence so the result is measurable, not anecdotal.
Three ways to engage
No retainer required. Pick the model that matches the work — pricing for this task starts from $3,500, with a fixed quote before anything starts.
Per task
Most popular
One clearly-scoped fix at a fixed price. Best when you know exactly what is broken and want it handled end to end.
- Fixed quote up front
- One PR, reviewed by you
- No retainer required
Hourly
Pay only for the hours worked. Best for diagnostics, audits, or exploratory work where the scope is still emerging.
- Weekly timesheets
- Pay for what you use
- No minimum commitment
Per sprint
A focused 1–2 week sprint when the work is bigger than one fix but smaller than a full project.
- 1–2 week blocks
- Clear sprint goal
- Scale up or stop anytime
Industry-standard stack, no proprietary lock-in
Migrate site to React — your questions, answered
How much does it cost to migrate Site to React?
Pricing starts from $3,500 and depends on the scope we find during the diagnostic. You get a fixed, written quote before any work begins — most engagements like this run 3–10 weeks.
How long does it take to migrate Site to React?
Typically 3–10 weeks for a focused engagement. After a short diagnostic we commit to a firm timeline so you know exactly what to expect.
Will you work directly on our existing codebase?
Yes. We work on your GitHub, GitLab or Bitbucket, ship every change as a pull request you review, and follow your code-review standards — not ours.
What exactly will I have at the end?
Concrete, documented outcomes — Migration plan with route-by-route mapping, Incremental cut-over, no big-bang launch, Data + SEO parity verified at every step, and more. No black-box agency report.
How quickly can you start, and do you sign an NDA?
For a focused task like this we can usually start within 24–48 hours of the brief. We sign an NDA on day one, before we look at any code — yours or ours.
Can you migrate without taking the site offline?
Yes. We migrate route-by-route with the strangler-fig pattern, running old and new side by side behind feature flags, with SEO and data parity checked at every step — no big-bang cutover, no downtime.
Can you migrate without freezing our roadmap?
Yes — that is the point of the route-by-route approach. The old and new stacks run together, so your team keeps shipping features while we migrate sections in parallel. There is no multi-month freeze and no single launch-day risk.
Keep exploring
Related tasks and resources to plan your next step with Krapton.
Let's get this off your plate
Send a 60-second brief on Migrate Site to React and a senior engineer replies within 24 hours with a plan and a fixed quote. NDA on day one, no retainer required.