Freelance Next.js Developer for SaaS Web Apps and Marketing Websites

Vlad Sedenko - Web Developer

Available for contract and freelance Next.js projects. Remote across Europe, UK, US, Canada.

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.

10+ years in web development Public projects: dr100, GetInData

Based in the EU, working remotely worldwide

Available for new projects from January 2026

View cases Engagement models About Vlad Send brief

Get a quote for your project

What you can hire me for

Next.js marketing website

SaaS dashboard / MVP frontend

CMS integration: Sanity / Strapi

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.

Technologies and how I use them

React

Next.js

Sanity

TypeScript

Stripe

Vercel

Next.js + React: SSR/SSG, App Router, interfaces, and production pages.

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: deployment, preview environments, monitoring, and faster iteration.

DEV 10+ 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.

WEB Dozens of tasks and projects

Contributed to dozens of website and web app projects across architecture, UI, frontend, CMS, optimization, and support since 2014.

UX Ongoing UX and SEO research

I regularly study SaaS, product, and marketing websites to improve structure, UX patterns, and conversion-focused implementation.

Engagement models

Audit

Technical audit for Next.js, SEO, performance, CMS, and UX structure.

Fixed scope

Clear deliverables, estimate, timeline, and acceptance criteria.

Monthly support

Support, improvements, new pages, monitoring, and careful releases.

Consulting

Architecture support, technical review, migration planning, or project estimation.

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;
the project requires medical, financial, or legal advice instead of development;
there is no time for a brief, priorities, and result review before release.

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.

Selected Next.js Projects

Last updated: November 2025

Below are verifiable links and one NDA-style example. For dental/finance projects I describe only the technical role: frontend, CMS, performance, accessibility, testing, and deployment. This is not medical or financial advice.

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: https://dr100.pl/

GetInData

Project: GetInData website

Role: Frontend Developer

Year: 2019-2020

Stack: React, Gatsby.js, GraphQL, Netlify

Deliverables: company website, SEO-oriented page structure, performance improvements, marketing implementation.

Public link: https://getindata.com/

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.

Related resources

How caching works in Next.js v13+ with App Router What is the difference between Next.js and Nest.js?React.js development and frontend support

FAQ

Can you be hired only for an audit?

Yes. I can review a Next.js project, identify technical risks, and prepare a prioritized improvement plan.

Do you work with agencies?

Yes. I usually join as a frontend/Next.js developer for production tasks, CMS integrations, performance, and release support.

What do you need for an estimate?

A short brief, links to design or the current site, must-have features, timeline, stack constraints, and expected engagement model.

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.