01
Load time is eating your funnel
Signups abandon while the spinner spins, and every growth experiment loses to the same four-second tax. You can see the drop-off in analytics; what's missing is the engineering to remove it.
Services
Web & frontend development
Your frontend is where load time turns into revenue and accessibility turns into risk. We build and replatform web frontends that hold a performance budget in production — migrated route by route behind flags, so your release cadence never stops.
Who this is for
You’ll recognize the situation
02
Google can't read your app
The product is a client-rendered SPA, so your highest-intent pages get indexed inconsistently — and the content marketing budget is paying for pages search engines half-see.
03
Every screen looks slightly different
Six years of features left three button styles, two modal systems, and a components folder nobody dares reorganize. Shipping UI now means archaeology first.
What’s included
Web & frontend, itemized
Frontend replatforms
Route-by-route migrations to modern stacks behind a reverse proxy and feature flags — 5%, 25%, 100% traffic shifts with instant rollback, and no release freeze.
Performance engineering
Real-user Core Web Vitals dashboards, per-route budgets enforced in CI, and the unglamorous work — fonts, images, bundle diet — that moves LCP for real users.
Design systems
Token-based component libraries with Storybook docs and visual regression tests, so old and new surfaces stay identical while you migrate.
Accessibility to WCAG AA
Audit, remediation, and CI checks that keep you compliant — keyboard, screen reader, and contrast issues fixed at the component level so they stay fixed.
Server-side rendering and static generation
Next.js App Router builds that ship HTML instead of JavaScript — server components by default, hydration only where users actually interact.
Frontend testing and CI
Playwright suites on the flows that make you money, wired into CI with flake budgets — so a red build means a real regression, not a retry.
How it runs
Four phases, no surprises
01
Diagnose
A two-week audit of real-user metrics, bundle composition, and rendering strategy. You get a ranked list of fixes with the estimated impact of each.
02
Plan
A route-by-route migration order that starts where speed pays back fastest — usually the signup funnel — with rollback defined before anything moves.
03
Build
Weekly increments behind flags, traffic shifted in stages, and a live dashboard splitting metrics by route so you watch the numbers move.
04
Scale
Performance budgets enforced in CI and your engineers merging into the new stack from week three — so the fast version stays fast after we leave.
1.2s
median LCP after a recent replatform
+19%
trial-to-paid conversion on migrated routes
−54%
JavaScript shipped at first paint
Illustrative figures from anonymized engagement profiles.
Case study
What that looks like shipped
The six-year-old React SPA behind a US course-authoring SaaS was losing signups to its own load time. A route-by-route replatform took LCP from 4.3s to 1.2s — and trial conversion followed.
Read the full case study
In depth
Core Web Vitals are a revenue line, not a lab score
Most buyers of frontend development services have seen the pitch-deck version of performance: a Lighthouse score turning from orange to green. That number is produced on a synthetic device in a quiet lab, and your revenue doesn't live there. It lives in the field — real users on mid-range phones and hotel wifi — where every second of largest contentful paint is a toll your funnel pays before a single experiment runs. A slow baseline doesn't just lose visitors; it caps the return on everything your growth team ships on top of it.
A US course-authoring SaaS is the concrete version. Its signup flow carried 1.9MB of JavaScript and a 4.3-second median LCP, and the growth team's A/B tests kept losing to a control that was, functionally, a spinner. We replatformed the funnel route by route: median LCP landed at 1.2 seconds, and trial-to-paid conversion rose 19% on migrated routes, holding across two full billing cycles. The sequencing mattered as much as the stack — we started where a second of speed was worth the most, so the project generated its own business case while it was still running.
What moves LCP is rarely exotic. It's shipping HTML instead of JavaScript — server components by default, hydration only where a user actually interacts — plus subset self-hosted fonts, images with explicit dimensions, and deleting the polyfills a 2019 build config still ships to browsers that no longer exist. Then the part most teams skip: per-route performance budgets enforced in CI, so the regression that would have quietly undone the work gets caught in a pull request instead of in next quarter's funnel report.
How to replatform without freezing the roadmap
Full rewrites get rejected for a good reason: the honest ones cost a year of feature freeze, and the dishonest ones cost more. The alternative is mechanical, not heroic. A reverse proxy sits in front of your application and routes traffic path by path — one route moves to the new stack while the legacy codebase keeps serving everything else, untouched. Your users never see a seam, and your team never stops shipping.
Every migrated route goes out behind a feature flag, with traffic shifted in stages — 5%, then 25%, then 100% — so rollback is a flag flip, not an emergency deploy. Real-user metrics stream to a dashboard split by route, and the decision to shift more traffic is made on numbers, not nerve. Migration order is a commercial decision too: signup funnel and marketing pages first, because that's where speed converts; internal admin screens last, because nobody abandons a dashboard they're paid to use.
The tradeoff we'll name up front: you run two frontends for the duration. That's a real cost — proxy configuration, shared auth and session state, page chrome that has to look identical on both sides — and it's bounded only by finishing. A migration parked at 60% is the most expensive state a codebase can be in, so the plan carries a route-by-route burn-down with dates attached. And from week three your engineers merge into the new codebase alongside ours, which is the difference between hiring a React development company and merely renting one.
A design system is an economics decision, not an aesthetics one
Three button styles and two modal systems aren't an aesthetics problem — they're a cost curve. Every feature in that codebase pays an archaeology tax: find the existing patterns, guess which one is canonical, rebuild it slightly differently, add to the pile. A token-based component library converts that per-feature tax into a one-time build plus a small maintenance line, and the payback compounds with every screen your team ships afterward.
The build itself is specific. Design tokens become the single source for color, type, and spacing; components get documented in Storybook so the next engineer discovers instead of reinvents; visual regression tests mean a change to a primitive can't silently reskin forty screens. During a replatform the system earns twice — it doubles as the compatibility layer that keeps legacy and migrated routes pixel-identical, which is exactly what lets you shift traffic without users noticing the stack changed underneath them.
The honest caveat: below a certain surface area, it doesn't pay back. One product and two frontend engineers don't need a governed component library — a folder of well-named components will do, and we'll say so. The economics turn when several teams ship UI in parallel; at that scale, new screens get assembled from cases the library already covers instead of rebuilt from scratch, and the saving compounds with every screen. The real risk isn't the build cost, it's adoption — a library nobody uses is pure overhead. So we make the system the migration's default path rather than an optional extra: every replatformed route is assembled from it, and by the time the migration ends, the library is simply how UI gets made.
Tools we reach for
A boring, hireable stack
Chosen so your team can maintain, extend, and hire for everything we leave behind.
- React
- Next.js
- TypeScript
- Tailwind CSS
- Storybook
- Playwright
- Vercel
- Node.js
FAQ
The questions buyers actually ask
Answered the way we’d answer them on a call — specifics included.
Audits are fixed-price with a fixed scope. Replatforms and design-system builds run time-and-materials against a route-by-route plan, so the invoice maps to shipped routes — not hours logged. You can stop at any route boundary; what's migrated stays migrated and keeps working.
You do. Everything is built in your repositories, the component library is published to your registry, and IP assigns to you on payment. We deliberately avoid bespoke abstractions your team couldn't maintain — the stack is the boring, hireable one.
At least four hours with your working day, guaranteed in the contract. Frontend work is demo-heavy, so we run Friday walkthroughs in your afternoon and keep a shared channel where questions get answered while you're still at your desk.
Faster than you'd expect, because we don't need to understand all of it — the audit maps the routes, the bundle, and the data flow in two weeks, and migration starts at the edges where risk is lowest. Legacy code keeps serving everything we haven't touched yet, which is the point of route-by-route.
We work under your SSO with least-privilege access, test against masked data, and keep analytics and session tooling inside your existing consent framework. Frontend changes go through the same review and CI gates as your own team's code — no side channel to production.
We commit to a measurement plan before we commit to code: real-user metrics split by route and cohort, and where conversion is the claim, a controlled experiment. If a fix doesn't move its metric, that's visible within weeks — and you can stop at the next route boundary with 30 days' notice, keeping everything shipped so far.
Yes — the mechanics don't care what's behind the proxy. We've moved routes off Angular, Vue, and server-rendered jQuery-era apps the same way, because the proxy splits traffic by path and the legacy framework keeps serving whatever hasn't moved yet. We build the destination in React and Next.js — that's where the hiring pool, the server-rendering maturity, and our depth are. If you're committed to a different destination framework, we'll tell you plainly whether we're the right team rather than bend the recommendation to win the work.
It's the most common fear and the most manageable one. URLs are preserved — or 301-mapped one-to-one where they genuinely must change — and titles, canonicals, and structured data are ported as part of each route's migration checklist, not as a cleanup phase. Because traffic shifts in stages, search engines see a faster page at the same address, and we watch Search Console per migrated route through the first weeks. In practice rankings tend to improve: server-rendered HTML gets indexed consistently, which is how the marketing pages on a recent SaaS replatform went from half-indexed to the client's cheapest signup channel.
Yes — temporarily and by design, and it's a tradeoff we'd rather name than hide. The legacy app goes into bug-fix-only mode while all new work lands on the new stack, shared design tokens keep the two visually identical, and the proxy makes the split invisible to users. The cost is bounded because the plan carries a route burn-down with dates: you always know what percentage remains and when it ends. The state we refuse to leave you in is the permanent hybrid — low-traffic routes are sequenced last, but they're never parked.
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