Chargement
WEB DEVELOPMENT PARIS
WEB DEVNext.js Paris
Slow WordPress, Wix that plateaus, Webflow that stalls at scale. The new baseline: Next.js + React + TypeScript. Lighthouse 95+, INP < 200 ms, and a site that holds the load the day it takes off.
REQUEST MY FREE AUDITFree audit · Reply < 24h
LIGHTHOUSE
desktop · prod0/ 100
Avg performance — 12 sites shipped
LCP
0.0s
INP
0ms
CLS
0.00
app/[lang]/page.tsx
main1
import { Metadata } from 'next';2
3
export const metadata: Metadata = {4
title: 'Dev Web Freelance — Paris',5
description: 'Lighthouse 95+, INP<200ms…',6
};7
8
export default async function Page() {9
return <Hero />;10
}● TypeScript strict · 0 errorsbuild 3.1s
STACK
Next.js 16React 19TypeScriptTailwind v4VercelSanityStripeSentry
+ 20 integrations depending on project
TESTIMONIAL
"Rebuilt, shipped on time, and SEO traffic ×3 in 4 months."
Mimoune R.
Founder · Agence Gust
CI / CD
build#428
statuspassed ✓
duration3.1s
deployed2 min ago
Vercel · auto preview + prod
CASE STUDY
agencegust.comBefore
2.4s
WordPress + Elementor
After
0.8s
Next.js 16 + Vercel
LCP ÷3 · SEO traffic ×34 months
AVAIL.
3
spots Q2 26
reply 24h
Updated on
TRUSTED BY
+ 10 more startups since 2021
Liedel LAM is a freelance Next.js and React developer based in Paris. Stack: Next.js 16 App Router, React 19, strict TypeScript, Tailwind v4, Vercel. Specialties: WordPress to Next.js redesigns, premium landing pages (LCP < 1 s), custom SaaS apps, Stripe + n8n integrations. Background: software engineer ex-aerospace defense industry (Rafale). Guarantees: Lighthouse 95+, WCAG 2.2 AA, strict TypeScript, Vercel CI/CD. 2026 pricing: landing from €2,800, vitrine from €6,500, custom from €15,000, day rate €750.
CODE QUALITY AUDIT — EXCERPT
What CI checks on every commit.
Pass
7
Warn
2
Fail
1
liedel-ci · build #428 · main
$ liedel ci --target=production
0 critical vulnerabilities · 1 moderate (upstream patch in flight)
TypeScript strict — 0 errors across 218 files
0 warnings, 0 errors — next/core-web-vitals rules
42 tests OK · 71% coverage (target ≥ 80%)
Perf 97 · A11y 100 · Best Practices 100 · SEO 100
LCP 0.8s · INP 88ms · CLS 0.02 — all good (CrUX p75)
Initial JS 188 KB · 312 KB margin under budget — review code-splitting
Service + Person + Organization + BreadcrumbList — valid
axe-core: 0 violations · WCAG 2.2 AA compliant
4 packages behind (next, react, eslint, tailwind) — non-blocking
Quality score : 70/100 · build ready to ship ✓
→ full CI report · Lighthouse CI · axe-core · weekly npm audit
DEVELOPMENT STACK·Next.js, TypeScript, Vercel & co
Next.js
React
TypeScript
Tailwind
Vercel
Sanity
Stripe
Sentry
GitHub
Figma
HOW IT WORKS
Delivery pipeline
DISCOVERY
01W1 — Discovery
DISCOVERY & ARCHITECTURE
Audit existing site if redesign (Lighthouse, bundle, schema, SEO). Workshop on business goals + KPIs. Technical architecture: framework, CMS, hosting, integrations. Low-fi Figma wireframes, scope sign-off.
Output
●Spec + wireframes validated
Stage 1/4active
DESIGN
02W2 — Design
TAILWIND DESIGN SYSTEM
Full design system: color tokens (oklch), typography, spacing, atomic components. Hi-fi Figma mockups desktop + mobile. Client validation before writing the first line of code.
Output
●Design system + hi-fi mockups
Stage 2/4active
BUILD
03W3 → W5 — Build
BUILD NEXT.JS + TYPESCRIPT
Code Next.js 16 App Router + React 19 + strict TypeScript. Reusable components, Vitest tests on business logic, CMS / Stripe / n8n integrations. Vercel preview deploy on every commit. Blocking Lighthouse CI under 95.
Output
●Site deployed in preview + tests passing
Stage 3/4active
SHIP
04W6 — Ship
SHIP & MONITORING
DNS switchover, Core Web Vitals check in prod (CrUX), schema.org validated, sitemap.xml, robots.txt, llms.txt. Sentry for error monitoring, Vercel Analytics for Web Vitals. Notion docs + 30 days support included.
Output
●Live production + monitoring + handover
Stage 4/4active
CONCRETE DELIVERABLES
01Source code Next.js 16 + React 19 + strict TypeScript (private GitHub repo)
02Tailwind v4 design system documented (tokens, components, dark mode)
03Headless CMS integrated (Sanity, Notion API, Contentful as needed)
04Integrations: Stripe Checkout, n8n webhooks, Resend / Postmark, GA4 / Plausible
05Core Web Vitals 2026 in the green (INP < 200ms, LCP < 2.5s, CLS < 0.1)
06Native SEO: metadata API, dynamic sitemap.xml, schema.org JSON-LD, llms.txt
07WCAG 2.2 AA accessibility (keyboard nav, contrast, ARIA, screen reader)
08Internationalization i18n (FR/EN/ZH/AR if needed) with /[lang] routing
09Vercel CI/CD deployment with preview branches + blocking Lighthouse CI
10Notion documentation: architecture, deployment, content updates
11Monitoring Sentry + Vercel Analytics + Slack/email alerting
1230 days post-delivery technical support included
MEASURED RESULTS — RECENT PROJECTS
FLAGSHIP
97
Lighthouse Perf — WP → Next.js redesign
Agence Gust — redesign of slow WordPress site (Lighthouse Perf 42, LCP 3.1s, INP 380ms) to Next.js 16 + Tailwind v4 + Notion CMS. Post-redesign result: Lighthouse Perf 97, LCP 0.9s, INP 142ms, CLS 0.02. SEO preserved via 301 redirects, organic traffic +18% the following month.
<0.8s
LCP — B2B SaaS landing
Premium landing for B2B SaaS startup (seed). Stack: Next.js 16 App Router, React 19, Tailwind v4, Vercel Edge hosting, AVIF image format, self-hosted variable fonts. Median LCP 0.76s (CrUX), Lighthouse Perf 100, INP 88ms. Landing conversion +34% vs old Webflow version.
0
incidents in 18 months — IDF BTP site
React site rebuilt from scratch for LB-Bennes (BTP/TP Île-de-France). Stack: Next.js + Tailwind + headless WP. Deployed on Vercel CI/CD. 18 months in production, 0 incidents, 0 downtime. Coupled with a technical SEO strategy: from page 5 to Google Top 3 on local queries.
WHAT CLIENTS SAY
“
Liedel rebuilt our WordPress site in Next.js. Lighthouse score went from 42 to 97, load time divided by 4. And zero bugs in 18 months of production. You speak directly to the person who codes — that's rare.
Liedel LAM
Founder — Agence Gust
“
Site rebuilt from A to Z by Liedel. Clean code, on-time delivery, performance on point. We get 4x more inquiries via the site than before.
Mimoune BENASSAID
Manager — LB-Bennes
WHY THIS stack?
Liedel LAM (freelance Next.js) vs traditional web agency vs no-code page builder (Webflow / Wix). Without commercial bias, in 2026.
CRITERION
Page builder (Webflow / Wix)
Traditional web agency
Liedel LAM Next.js★
2026 tech stack
Proprietary Webflow / Wix
WordPress + page builder
Next.js 16 + React 19 + strict TS
Lighthouse performance
60-80 (median)
40-70 depending on plugins
95-100 guaranteed
Vendor lock-in
Total — code not exportable
Moderate — WP open source
None — repo GitHub yours
Custom business logic
Limited to plugins
Fragile WP plugins
No limit — TypeScript code
Who executes
You (template) or agency
6 junior contacts
The freelancer you hire
Typical 2026 pricing
€3-15k + platform subscription
€30-80k project
€2.8-15k + €0 subscription
Page builder (Webflow / Wix)
2026 tech stack
Proprietary Webflow / Wix
Lighthouse performance
60-80 (median)
Vendor lock-in
Total — code not exportable
Custom business logic
Limited to plugins
Who executes
You (template) or agency
Typical 2026 pricing
€3-15k + platform subscription
Traditional web agency
2026 tech stack
WordPress + page builder
Lighthouse performance
40-70 depending on plugins
Vendor lock-in
Moderate — WP open source
Custom business logic
Fragile WP plugins
Who executes
6 junior contacts
Typical 2026 pricing
€30-80k project
Liedel LAM Next.js★
2026 tech stack
Next.js 16 + React 19 + strict TS
Lighthouse performance
95-100 guaranteed
Vendor lock-in
None — repo GitHub yours
Custom business logic
No limit — TypeScript code
Who executes
The freelancer you hire
Typical 2026 pricing
€2.8-15k + €0 subscription
WHEN EACH WINS
Page builder (Webflow / Wix)
Solo founder or very small marketing team needing a simple brochure, zero business logic, with design > tech budget.
Traditional web agency
Large account with formal procurement process, need for integrated CRM/PIM platforms, project budget €50k+.
Liedel LAM Next.js
SMBs, startups, scale-ups wanting a fast, maintainable, scalable site without paying for 3 layers of management. My positioning.
Sources: Malt React benchmark 2026 · RH-Solutions IT day rate 2026 · Webindme website pricing 2026 · La Refonte 2026 · State of JS 2025 · Vercel Web Almanac 2025.
FOR WHO?
6 TYPICAL PROFILES
01 / 06
SMBs → aging WordPress redesign to performant, maintainable Next.js
02 / 06
Seed / Series A startups → premium converting landing + custom back-office
03 / 06
Scale-up SaaS → custom web app, dashboard, multi-tenant, Stripe
04 / 06
Creative agencies → front-end dev subcontracting on projects too limited for Webflow
05 / 06
Headless e-commerce → Shopify Liquid → Next.js + Shopify Storefront API migration
06 / 06
Media / publishers → E-E-A-T editorial site with headless CMS and SEO/GEO ready
PRICING TRANSPARENCY
Four formats: from one-shot landing to custom application, plus monthly maintenance. Prices ex-VAT, starting prices shown, public sources (Malt 2026 React benchmark, RH-Solutions 2026, Webindme 2026).
LANDING
One-shot — premium converting page
starting at
€2,8002 to 3 weeks
FOR
Startups, product launches, paid campaigns that need a converting page
INCLUDED
- Figma design desktop + mobile
- Single page Next.js + Tailwind v4
- Integrations: form, GA4, Meta pixel
- Lighthouse 95+ guaranteed, LCP < 1s
- Vercel hosting + domain configured
- 30 days post-delivery support
MOST POPULAR
VITRINE
Full site — 5 to 10 pages + CMS
starting at
€6,5004 to 6 weeks
FOR
SMBs and freelancers wanting a pro, maintainable, SEO-ready site
INCLUDED
- Full Tailwind design system
- 5 to 10 pages Next.js + headless CMS
- Editable blog + native SEO
- Integrations: contact, GA4, schema.org
- WordPress / Wix / Webflow redesign possible
- WCAG 2.2 AA + i18n FR/EN if needed
CUSTOM
Custom web app — SaaS, dashboard, marketplace
starting at · on quote
€15,0008 to 16 weeks
FOR
Scale-up SaaS, marketplace, member area, business dashboard
INCLUDED
- Discovery + technical architecture
- Full design system + mockups
- Front Next.js + back Node.js / Postgres
- Auth, Stripe payment, API integrations
- Vitest + Playwright tests + CI/CD
- Technical documentation + handover
CARE
Monthly — maintenance + improvements
/ month
€6906-month commitment
FOR
Production Next.js sites needing improvements, monitoring and security watch
INCLUDED
- 5h of improvements / month
- Dependency updates (Next.js, React)
- Sentry + Vercel Analytics monitoring
- Security watch (weekly npm audit)
- Monthly performance reporting
- SLA response < 24h business days
Prices ex-VAT · Day rate €750 for ad-hoc missions · Free 30-min audit no commitment · Sources: Malt React benchmark 2026, RH-Solutions IT 2026, Webindme website pricing 2026
FREQUENTLY Asked
WordPress remains viable for a blog or simple brochure, but its PHP + plugins + page builder stack blows up Core Web Vitals beyond a certain complexity (43% of WP sites fail INP in 2026). Webflow is excellent for pure marketing but blocks on custom business logic, serious i18n, and non-trivial integrations. Next.js + React + TypeScript gives a fast (LCP < 1s achievable), maintainable, scalable site with native SEO/GEO. Vercel makes deployment trivial. It's become the 2026 standard for anyone investing in a durable technical asset.
Premium landing: 2-3 weeks. 5-10 page vitrine site with CMS: 4-6 weeks. WordPress redesign with content migration: 6-10 weeks depending on volume. Custom web app (SaaS, dashboard, member area): 8-16 weeks depending on scope. I always cut into 1-2 week sprints with end-of-sprint demos, so you see the product take shape.
Headless by default, chosen by use case: Sanity when the editorial team wants flexibility (rich text, custom content models), Notion API when the client already uses Notion daily (zero friction), Contentful on enterprise projects with validation workflow. If you insist on WordPress, I can plug it as headless via WPGraphQL — but it's rarely the best choice on a fresh project.
Yes. For WordPress: REST API or WP-CLI export, transformation to Markdown or CMS documents, 301 redirects preserving SEO juice. For Wix / Webflow: structured crawl + scraping, URL mapping to new architecture, redirects, post-migration GSC verification. SEO never tanks when done correctly — I've already moved a Wix site to Google Top 3 two months after switchover.
Yes, provided three rules: (1) Preserve all existing URLs or set up clean 301 redirects, (2) Keep and enrich title / meta / schema.org tags, (3) Migrate Core Web Vitals to green. I always pair a redesign with a prior SEO/GEO audit to identify quick wins. On a BTP client case in Île-de-France, we went from page 5 to Google Top 3 in 8 months after an optimized WordPress redesign.
Yes: Next.js Route Handlers, Server Actions, Vercel edge functions, and dedicated Node.js back-end (Fastify, Hono) when complexity warrants it. Databases: PostgreSQL (Neon, Supabase), Turso for the edge, Redis for cache. Auth via NextAuth, Clerk or Supabase Auth. For blockchain (Solidity smart contracts), it's a separate service — Liedel LAM holds an École Alyra blockchain developer diploma (with high honors).
Yes, by default. Full keyboard navigation, verified contrasts (4.5:1 minimum), ARIA labels on interactive components, visible focus, alt text on all images, semantic HTML5 structure. Automated axe-core tests in CI + manual VoiceOver / NVDA tests before delivery. With the European EAA directive in force since June 2025, it's become a legal as well as technical issue.
Vercel by default: unbeatable DX, global edge network, automatic preview branches, native Web Analytics. Reasonable cost (Pro at $20/month is enough for most sites). If sovereignty is a concern (health, defense, public sector), I deploy on Scaleway, OVH or Clever Cloud with a Dockerfile + GitHub Actions — Next.js runs very well outside Vercel.
An agency charges €30-80k for a Webflow or WordPress site with 6 contacts (sales, account manager, designer, junior front dev, offshore back dev, project manager). You get PowerPoint, status reports, and three months of delay. Me: 1 contact (the one who codes), modern Next.js / React / TypeScript, clean GitHub repo, Vercel, and the same technical quality I shipped at Dassault Aviation. No reseller margin, no overhead.
RELATED SERVICES
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OR FILL THE DETAILED FORM →Ex-software engineer — aerospace defense industry (Rafale)Expert Next.js / React / TypeScript — Lighthouse 95+ guaranteedBlockchain Developer diploma École Alyra (with high honors)