12+ years in development
I have worked as a web developer since 2014, from freelance projects to product teams. My background can be checked through LinkedIn.
See all servicesNext.js Development
Vlad Sedenko · Web Product DeveloperService / Independent specialist
Freelance Next.js Developer for SaaS Web Apps and Marketing Websites
I help startups, agencies, and B2B teams build production-ready Next.js websites, web apps, and CMS-driven marketing platforms with React, TypeScript, Sanity/Strapi, and Vercel.
- Marketing websites, landing pages, and product pages in Next.js
- SaaS dashboards, MVPs, and internal web applications
- CMS integrations, forms, analytics, deployment, and support
- Performance, Core Web Vitals, and SEO-ready technical structure
I work remotely with clients across Europe, the UK, the US, and Canada. My portfolio includes verifiable projects such as dr100 and GetInData, and for NDA projects I describe only the factual technical scope.
12+ years in web developmentPublic projects: dr100, GetInData
Get a quote for your projectBased in the EU, working remotely worldwide
Currently taking new projects, reply within 24 hours
Selected work / dr100
Software for the everyday work of a dental practice.
Marketing website and application frontend for dr100, a platform for dental clinics.
/ Services
What you can hire me for
-
Next.js marketing website
-
SaaS dashboard / MVP frontend
-
CMS integration: Sanity / Strapi
-
App Router migration and Next.js upgrades
-
Headless commerce storefront on Next.js
-
Performance & technical SEO cleanup
-
Monthly support and maintenance
Marketing websites
B2B websites, landing pages, service pages, and product pages with clear structure, CMS, and SEO-ready metadata.
Web apps and MVPs
Portals, dashboards, SaaS interfaces, and MVPs with React, TypeScript, protected flows, and maintainable architecture.
CMS-driven platforms
Sanity or Strapi setups for teams that need to update content without developer help for every small change.
Performance and SEO fixes
Audits and improvements for speed, indexing, metadata, sitemap, canonical, schema, internal links, and Core Web Vitals.
App Router migrations and upgrades
Moving Pages Router projects to the App Router, upgrading Next.js versions, adopting React Server Components, and untangling caching without breaking live URLs.
Headless commerce and multilingual sites
Next.js storefronts on top of WooCommerce or Shopify, and multilingual sites with hreflang, localized routing, and CMS-driven translations.
/ Stack
Technologies and how I use them
Next.js + React
App Router, React Server Components, SSR, SSG, and ISR, streaming, route handlers, and server actions for production pages and app flows.
Sanity/Strapi
Editorial content, blog, landing pages, cases, and localization.
Stripe/Supabase/Firebase
Payments, auth, forms, data, and integrations when the project needs them.
TypeScript
Typed data contracts and fewer regressions as the product grows.
Cypress/Storybook
Checks for critical flows and stable UI components.
Vercel, Netlify, or self-hosted
Deployment, preview environments, and monitoring on Vercel or Netlify, or a Node and Docker setup on your own infrastructure.
120+ launched projects
Contributed to 120+ website and web app launches across architecture, UI, frontend, CMS, optimization, and support since 2014.
Ongoing UX and SEO research
I regularly study SaaS, product, and marketing websites to improve structure, UX patterns, and conversion-focused implementation.
/ Engagement
Engagement models
Audit
Technical audit for Next.js, SEO, performance, CMS, and UX structure. Delivered in 3–5 working days as a prioritized plan.
Fixed scope
Clear deliverables, estimate, timeline, and acceptance criteria. Landing pages from €1,500, websites and MVPs from €5,000, product builds from €20,000.
Monthly support
Support, improvements, new pages, monitoring, and careful releases. Quoted per brief, no mandatory retainer.
Consulting
Architecture support, technical review, App Router migration planning, or project estimation.
/ Fit
Who This Is For
A good fit if
-
you need a Next.js website or web app that can grow after launch;
-
performance, SEO-ready structure, CMS, and team usability matter;
-
you need a developer who can work with design, business context, and code.
Not the right fit if
-
you need guaranteed Google rankings or instant traffic growth;
-
there is no time for a brief, priorities, and result review before release.
/ Process
How I work
Planning
Scope, priorities, page map, user flows, CMS needs, integrations, and acceptance criteria. The output is a practical delivery plan, not a vague discovery document.
Structure and UI
Reusable sections, responsive layouts, accessibility basics, content states, and page patterns that can support new service pages, landing pages, or app flows later.
Development
Next.js + TypeScript, Sanity/Strapi CMS, protected admin routes, environment-based secrets, preview deployments on Vercel, handover notes for the team. Stack chosen per project.
Optimization and release
Metadata, sitemap, canonical, schema, redirects, image handling, caching, analytics events, form checks, and post-launch fixes for priority pages and flows.
12+
years in web development
120+
launched projects
24h
reply, EU-based
/ Projects
Selected Next.js Projects
Below are verifiable links and one NDA-style example. For the dental and finance projects I describe only the technical role: frontend, CMS, performance, accessibility, testing, and deployment.
dr100
Project: dr100
Role: Frontend Developer
Year: 2022-2023
Stack: Next.js, React, Tailwind CSS
Deliverables: marketing page, frontend for SaaS app, responsive UI, support for the marketing team.
Public link: dr100.pl · Read the dr100 case study
GetInData
Project: GetInData website
Role: Frontend Developer
Year: 2019-2020
Stack at the time: React, Gatsby.js, GraphQL, Netlify. The site has since moved to Next.js.
Deliverables: company website, SEO-oriented page structure, performance improvements, marketing implementation.
Public link: getindata.com · Read the GetInData case study
NDA finance subscription app
Project: NDA finance subscription management app
Role: Frontend / Full-stack Developer
Year: NDA
Stack: Next.js, React, TypeScript, tRPC, Prisma, shadcn/ui
Deliverables: frontend architecture, data handling, UX for reducing manual input errors, e2e testing, accessible UI.
Public link: Not public due to NDA · Read the finance CRM case study
/ Resources
Related resources
Send a project brief
Describe the project, current problem, or estimation task. I will reply with clarifying questions, suggest the next step, and recommend a suitable engagement model.
Email:
vlad@sedenko.net
- the website or app you want to build or improve;
- links to design, current URL, or repository when possible;
- rough timeline, priorities, and expected cooperation format.
Frequently asked questions
How much does a Next.js developer cost?
A landing page or micro-site starts from €1,500, a business website or a focused MVP from €5,000 with a fixed scope in writing, and a full product build from €20,000. Audits, consulting, and monthly support are quoted per brief. You pay one senior developer directly, without agency account and project managers in between, and the scope and estimate are agreed in writing before work starts.
How long does a Next.js website or MVP take?
A marketing website with CMS typically takes 3–6 weeks from brief to launch. A focused MVP takes 2–4 weeks for the first launchable version, then grows in phases. An audit takes 3–5 working days. The timeline is fixed together with the scope before work starts.
Do you work with the App Router and React Server Components?
Yes. New projects run on the App Router with React Server Components, streaming, route handlers, and server actions. I also migrate existing Pages Router projects to the App Router step by step, keeping the site live and indexed during the move.
Can you migrate an existing site to Next.js?
Yes. I move sites from WordPress, Gatsby, Create React App, Webflow, and custom stacks to Next.js: content migration, URL mapping and redirects, metadata parity, and a launch checklist so rankings are preserved.
Do I have to host on Vercel?
No. Vercel is the fastest path for most teams, but Next.js also runs on Netlify, Cloudflare, AWS, or a self-hosted Node or Docker setup. I pick the hosting that fits your budget, compliance needs, and existing infrastructure.
Can you be hired only for an audit?
Yes. I review the Next.js project, check performance, caching, SEO structure, accessibility basics, and security risks, and deliver a prioritized improvement plan you can hand to any developer or ask me to implement.
Do you work with agencies and in-house teams?
Yes. I join as a frontend or Next.js developer for production tasks, CMS integrations, performance work, and release support. I work in your repository, follow your review process, and leave handover notes so the team can continue without me.
Which time zones and working hours do you cover?
I am based in Warsaw (CET), which overlaps the full European working day, the UK morning to afternoon, and the US East Coast morning. I reply within 24 hours on working days and agree on a fixed overlap window for calls with US and Canadian clients.
What do you need for an estimate?
A short brief, links to design or the current site, must-have features, timeline, stack constraints, and the expected engagement model. I reply with clarifying questions and a written estimate.
Related / Services
Related services
01
SaaS Development
SaaS and web application development for founders and small businesses: architecture, accounts and roles, Stripe subscriptions, dashboards, admin panels and client portals — built by one senior developer, from MVP to a product that scales.
SaaS Development →02Speed Optimization
Website speed and Core Web Vitals optimization: measured performance work that makes your site load fast, pass Google's metrics and convert better.
Speed Optimization →03React Development
Looking for a skilled React developer? With over 10 years of experience in React, JavaScript and web development, I deliver high-quality solutions for businesses worldwide.
React Development →