Web Development & CRO · B2B · Barcelona
Websites that convert.
Custom WordPress + Gutenberg. LCP < 1.2 s. Lighthouse 95+. First Load JS < 80 KB gzip. CRO + A/B testing wired into the CRM. Every component trackable to revenue. Operational handoff to the client team. Zero lock-in.
Summary · TL;DR
What does a B2B web development + CRO agency deliver?
A professional-grade B2B web development agency delivers custom WordPress (or Astro / Next.js depending on the project), with a PHP 8.2 + Gutenberg + ACF Pro + SASS/esbuild stack. Measurable target: LCP < 1.2 s mobile, Lighthouse 95+, First Load JS < 80 KB gzip. Plus CRO + server-side A/B testing + CRM attribution.
cronuts.digital builds custom B2B websites out of Barcelona with fixed-scope pricing: Starter €12K (8-15 pages), Grow €28K (landing system + CRO + A/B framework), Scale custom. Lighthouse 95+ guaranteed at go-live. Cases: Eninter rebuild Lighthouse 96, MITS +63% sales, Proddigia +400 requests/month. Only 3 projects per month.
Companies already moving their number with us
68% of B2B websites have LCP > 3 s and leak 40% of leads to friction. And you’re paying for traffic that doesn’t convert.
Free web audit →Web Development & CRO · 9 disciplines
Nine disciplines. One website that converts.
Our own stack: custom WordPress + Gutenberg + ACF Pro. LCP < 1.2 s, Lighthouse 95+, First Load JS < 80 KB. CRO trackable to CRM. 3 slots per month.
Main landing
B2B web development
Custom WordPress theme, no builders. PHP 8.2 + Gutenberg + ACF Pro. Inline critical CSS, self-hosted fonts, Brotli, HTTP/2. LCP < 1.2 s guaranteed.
Web design
B2B web design
Brand-calibrated design system: typographic tokens, colors, grid. Figma → code 1:1. WCAG AA accessible. Mobile-first responsive with sensible breakpoints.
Barcelona
Barcelona web development agency
Local team with on-site sessions at our Aribau office. Two-week sprints, live demos. Ideal for companies that value proximity and control.
CRO
CRO + A/B testing
Heatmaps, session recordings, funnel analysis. ICE-prioritized hypotheses. Server-side tests with GrowthBook. +32% average CVR in 90 days.
Landing pages
Conversion landing pages
Campaign, product and event landings with copy + design + tracking. CRO-first. Wired into Paid Media for traffic quality + CRM for closed-loop.
Core Web Vitals
Core Web Vitals & performance
LCP, INP, CLS audited with CrUX + WebPageTest. Critical CSS, AVIF/WebP image optimization, code-splitting, HTTP/2 push. Target: 95+ Lighthouse mobile.
Migration
WordPress migration without losing SEO
Theme rebuild preserving slugs, Yoast redirects, ACF schema and posts. Zero-loss protocol validated with GSC + SE Ranking pre/post. Overnight cutover.
Headless · NEW
Headless WordPress + Next.js
Next.js / Astro frontend, WordPress REST/GraphQL backend. When the case warrants it: complex apps, multi-tenant, JS-first teams. Not as a trend.
Maintenance
Premium web maintenance
WP + plugin updates, 3-2-1 backups, security hardening, 99.9% uptime monitoring, weekly Web Vitals. Incidents < 4 h. Monthly executive report.
Tech stack · no hidden debt
Custom WordPress done right. No future debt.
A poorly optimized page builder ships 300+ KB of CSS/JS that Core Web Vitals punishes. Our stack: PHP 8.2 + Gutenberg + ACF Pro + custom blocks + SASS/esbuild build. Self-hosted fonts. Zero jQuery in the frontend. Lighthouse 95+ from deploy day.
- Custom PHP 8.2 theme + native Gutenberg + server-side rendered blocks
- Inline critical CSS + preloaded fonts + async non-critical
- AVIF/WebP images via Imagify + <picture> srcset responsive
- HTTP/2 + Brotli + security headers (CSP, HSTS, Referrer-Policy)
- ACF Pro + schema_jsonld + FAQPage + Speakable · GEO ready
- CRO: server-side GA4 + GrowthBook A/B testing + opt-in heatmaps
8 stack components
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01
Core
PHP 8.2 + WordPress 6.x
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02
Core
ACF Pro
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03
Perf
SASS + esbuild
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04
Perf
Imagify
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05
Perf
WP Rocket
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06
SEO
Yoast SEO Premium
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07
CRO
GrowthBook
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08
Analytics
GTM server-side
Only 3 slots per month
Custom web projects need 6-10 weeks with senior attention. We cap capacity to guarantee quality and clean handoff to the client team.
How we work
Three phases. Lighthouse 95+ from deploy day.
Method proven across 40+ shipped B2B websites. Custom theme, operational handoff and documentation from day 1. Average project: 8 weeks door to door.
Phase 01 · Audit + Design
Audit + design system
Lighthouse + real-user CrUX, analytics + GSC review, URL + redirects mapping, schema_jsonld inventory. Design system: tokens, Figma components, libraries.
Phase 02 · Build
Custom theme + blocks
Cronuts-* theme scaffold, custom Gutenberg blocks, ACF field groups, SCSS tokens, esbuild pipeline. Per-template critical CSS, preloaded fonts, AVIF/WebP images.
Phase 03 · Launch + CRO
Zero-loss cutover + A/B
Redirects audit, GSC submit, verified Lighthouse CI. Post-launch: server-side GA4, GrowthBook A/B tests on ICE-prioritized hypotheses. Handoff with SOPs to the in-house team.
Real cases · verifiable numbers
Custom websites with conversion impact.
Eninter: builder-free custom WordPress rebuild + CRO industrial landings = +5,400 leads with LCP < 1.1 s.
MITS cashmere: content-led ecommerce rebuild + cart CRO = +63% sales in 3 years.
Proddigia: CRO landing pages wired into Paid Media with CPL €32.60.
Web Development Truths 2026
Six things your agency isn’t telling you.
A poorly optimized page builder ships 300+ KB of CSS/JS that CWV punishes.
LCP > 2.5 s = losing 40% of leads. SEO that doesn’t move isn’t SEO, it’s latency.
Unmaintained plugins = open doors. 80% of WP hacks come from outdated plugins.
A B2B website without CRO is an expensive brochure. Every form deserves an experiment.
Headless isn’t the answer for everything. Custom WordPress still wins 90% of B2B cases.
Without documented handoff, the website is held hostage by the agency. We ship SOPs.
Verified reviews · B2B CTOs and CMOs
Companies running Lighthouse 95+ with rising conversion.
Frequently asked questions
What CMOs and CTOs ask us before signing.
How much does a custom B2B website cost?
Why don’t you use Elementor / Divi / WPBakery?
What company size is a good fit?
What happens to our SEO during a rebuild?
Can we edit the site without you afterwards?
How long does the project take?
What is the Lighthouse 95+ guarantee?
Only 3 slots per month? Why?
Web audit · free · 7 days
We’ll show you what’s holding back your web conversion right now.
We review your current site: real-user Lighthouse, Core Web Vitals, tech stack, SEO architecture, critical CRO friction. Executive document with diagnosis + prioritized quick wins. If there’s no real opportunity, we tell you before signing.