Websites, online stores and web apps built in Next.js and TypeScript, deployed on Vercel. Work directly with the developers, with scope, price and timeline agreed in writing before we start.
What a Next.js build should give you, and what we put in writing.
Speed
Speed measured at handover
Server Components and static rendering keep JavaScript small, and next/image serves AVIF and WebP at the right size. Lighthouse mobile Performance 95+ at handover is in the contract.
Leads
Found, then chosen
Schema, clean metadata, sitemaps and hreflang help you get found in search and AI answers. Short forms that work on any phone make it easy to send an inquiry.
Ownership
Your repo, your Vercel
After the final payment, the code, design files and content are yours. Host on your own Vercel account or with us. No proprietary builder, nothing to license.
How we build
The App Router, used properly.
↓ Request
EdgeVercelGlobal CDN, a preview URL for every change, instant rollbacks
ContentHeadless CMSSanity: structured, typed, editable by your team
ServicesIntegrationsForms, payments, email, analytics and your own APIs
Anatomy of a Kvant Next.js build
Read more
Next.js has changed a lot since the Pages Router. We build on the App Router the way the framework is designed to be used today:
Server Components by default. Most of the page renders on the server and ships as HTML. Only interactive parts, like a gallery or a product filter, become client components.
Static first. Pages are generated at build time and revalidated when content changes, so visitors get cached HTML from the edge instead of waiting for a server.
Server Actions and route handlers for forms, webhooks and integrations, with validation on the server and no separate backend to maintain.
SEO in code. The Metadata API, sitemaps, robots rules, Open Graph images and JSON-LD are typed code, not plugins.
Typed end to end. TypeScript across content, components and API calls, so mistakes break the build, not the page your customers see.
Still on the Pages Router? We can plan a gradual move to the App Router, one route at a time, without freezing your roadmap.
What's included
What our Next.js development services include.
Next.js App Router with TypeScript
Custom design in Figma, no templates
Deployment on Vercel with preview URLs
Headless CMS when the site needs one
Lighthouse mobile 95+ at handover
Technical SEO: metadata, sitemap, schema
hreflang for multilingual sites
Cookieless analytics and Speed Insights
Accessible markup, built to WCAG 2.2 AA
Repository handover with a readme
Content
A headless CMS your team will actually use.
When a site needs one, we build in Sanity, a headless CMS with a visual editing studio. Content is stored as structured data, not as blobs of HTML, so the same product description can feed the website, a landing page and a newsletter without copying and pasting.
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Editors change text, images and blog posts without touching code.
Drafts preview on the real design before anything goes live.
Translations sit side by side, one field per language.
Publishing triggers revalidation, so updates are live in seconds, with no full rebuild.
Already running another headless CMS with a content API? Name it in the brief. We review it before we send the proposal, so the price reflects the real integration work.
Process
Four steps, one team.
A Next.js agency in Serbia, on CET: the same two people take your project from the first call to launch.
01
Brief
A short form or email, and a free 30-minute video call if you want one. Once we know what you need, you get a proposal with the scope, price and launch date.
Proposal
02
Design
Figma designs for every key template, built around your real content. The number of revision rounds is in the proposal.
Your real content
03
Build
We code in Next.js on a private preview URL that updates with every change, so you review real pages, not screenshots.
Private preview URL
04
Launch & care
Launch, training and handover of the repository. Maintenance after launch is its own proposal, if you want one: hosting, updates and changes, scoped to your site.
Lighthouse 95+ at handover
Web apps
Fixed-scope sprints.
One two-week sprint
12345678910
Day 1ScopeGoals and acceptance criteria, agreed in writing
Days 2–9BuildProgress on a preview URL you can click through
Day 10DemoWalkthrough, feedback and sign-off
Websites follow the four steps above. Web apps, client portals and SaaS MVPs need more room, so we run them in two-week sprints inside a fixed overall price for the agreed scope.
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It starts with discovery: user flows, data model and a scoped backlog. Every sprint then has a written scope agreed before it starts, a preview deployment you can test and a demo at the end.
New ideas mid-sprint go into a later sprint or a separate quote, so the price you signed stays the price you pay. Work outside the agreed scope is quoted in writing first, and done only after you approve it.
Project
A static Next.js catalog.
Morava Modern, our family practice's house-plan catalog, runs on Next.js 16 and Vercel. Every plan and collection page is generated at build time, and the scores on the card come from our Lighthouse runs on the live site.
Thresholds from Google's Core Web Vitals guidance, measured at the 75th percentile of page loads.
Google measures page experience with three Core Web Vitals. We design and build against the “good” thresholds from the first sketch, not in a clean-up sprint before launch.
Read more
On Vercel, every change gets its own preview URL and every release can be rolled back in seconds. After launch, Speed Insights reports vitals from real visitors, without cookies, so you see how the site performs for your customers, not just in a lab test.
Proof
Our family practice's Next.js site, measured.
Projektikuce.rs, the site of CAD ART, our family's architecture practice, runs on the stack we build for you: the App Router, static pages, typed metadata and schema. We built it and grow it ourselves. In 12 months it had 58,000+ visitors, 46,000+ of them from Google, and ChatGPT sent another 364.
Unique visitors per month, September 2025 to August 2026.
0
2,000
4,000
6,000
Peak5,571Latest5,367
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Monthly visitors to projektikuce.rs. Line chart of monthly visitors, September 2025 – August 2026: lowest 3,883 (December 2025), highest 5,571 (March 2026). The full numbers are in the table.
Month
Visitors
September 2025
4,364
October 2025
4,260
November 2025
3,885
December 2025
3,883
January 2026
4,682
February 2026
4,391
March 2026
5,571
April 2026
4,563
May 2026
4,624
June 2026
4,087
July 2026
4,657
August 2026
5,367
visitors in 12 months
58,000+
visitors from Google
46,000+
visitors sent by ChatGPT
364
of visits on a phone
72%
€0ad spend
100% organic. No Google Ads, no sponsored posts since launch. About 78% of visitors came straight from Google.
Source: Vercel Web Analytics · projektikuce.rs · 09/2025–09/2026
Pricing
The price follows the scope.
After a short exchange you get a proposal with the exact scope, price and timeline, before we start. Marketing sites follow the four steps above; web apps, portals and SaaS MVPs run in two-week sprints inside the agreed price.
integrations: forms, payments, email and your own APIs
languages and markets
an existing codebase or a move from the Pages Router
for web apps: user flows, roles and the data model
How quotes work
1You send a few sentences about your business and what you need.
2We clarify the details, in writing or on a short call.
3You get a proposal with the exact scope, price and timeline.
Who builds it
You talk to the people who write the code.
Kvant Studio is run by two brothers, Jovan and Branko Milivojević: architects by training, programmers by passion.
We both design the interfaces and write the Next.js. Jovan designed and built our family practice's sites, projektikuce.rs and moravamodern.com, and Branko also adds 3D visualization, imagery and 360° tours when a project needs them. There is no account manager between you and the work.
We answer your questions personally. Calls run Monday to Friday, in CET working hours. Email, WhatsApp or a phone call all reach one of us.
We plan the site with you, build it and connect it to tools for inquiries, bookings or sales. After handover, you choose: run it yourself, with us or with someone else. The code is yours, and you have access to the accounts.
01StrategyWe start with your customers, your competitors and the searches that matter, then agree on the plan and the proposal.
02BuildCustom design and hand-written Next.js code. Fast, in your customers' languages and ready for Google from the first day.
03ConnectWe set up the tools around the site and tell you which ones are worth it for your business, and which aren't.
04GrowAdvice, articles and SEO, as your business needs them. We read the numbers with you and agree on the next step together.
What we set up and connect
Google Business Profile
Google Search Console
GA4 or Vercel Analytics
Social profiles
Viber and WhatsApp
Payment gateways
CRM and newsletter
FAQ
Next.js, answered.
Why Next.js instead of WordPress?
Speed, security and ownership. A Next.js site ships pre-rendered pages with no plugin layer to patch, so there are fewer moving parts to slow it down or attack, and everything we code in Next.js is handed over with Lighthouse mobile Performance 95+. WordPress is still the right call for some teams, and we explain when in our Next.js vs WordPress comparison.
Do you take over existing Next.js projects?
Yes, after a short code review. You get a proposal for a defined scope, such as a redesign, an App Router migration or a performance pass, with a fixed price for that scope.
Can our own developers work on the code later?
Yes. You get a standard Next.js and TypeScript repository, a readme and a handover session. Any developer who knows Next.js can pick it up.
Do we have to host on Vercel?
No, but we recommend it. Vercel makes Next.js, so preview URLs, image optimization and revalidation work without extra setup. Next.js also runs on your own Node.js server or other hosts; we tell you what changes before we quote.
How do fixed-scope sprints work with a fixed price?
After discovery, the proposal fixes the overall price for the agreed scope. Each two-week sprint delivers an agreed slice of that scope, with a demo at the end. New work is quoted separately and starts only after you approve its scope and price.
What does “Lighthouse 95+ at handover” mean?
At handover we run Lighthouse on mobile for the key pages. If Performance scores below 95, we fix it for free. It is written into the contract.
How much does a Next.js website cost?
The price follows the scope: the pages and templates, the CMS, integrations, languages and, for web apps, the user flows and data model. After a short exchange you get a proposal with the exact scope, price and timeline, before we start, and for the agreed scope the price is fixed. Work outside it is quoted in writing first. Hosting is separate: on your own Vercel account or with us. See how quotes work.
Can we hire a Next.js developer from you by the hour?
We deliver projects with an agreed scope, either as a whole or in sprints. Work outside an agreed scope is quoted in writing before we start it.
Our family practice's house-plan site, built and ranked by us: 58,000+ visitors in 12 months, most of them from Google. The numbers, what worked, and the mistakes we fixed.
100% organic traffic, €0 ad spend since launch.
Vercel Web Analytics · projektikuce.rs · 09/2025–09/2026
Let's build it in Next.js.
Tell us what you are building. We will help you work out what you need and suggest a next step.
