Web Development & CRO · B2B · Barcelona

Websites that convert. No Elementor or page builders.

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.

Free web audit →See the tech stack

<1.2s

Target mobile LCP

95+

Minimum Lighthouse

+32%

Average CVR lift post-CRO

3/mes

Slots · premium projects

Summary · TL;DR

What does a B2B web development + CRO agency deliver?

A professional-grade B2B web development agency delivers custom WordPress without page builders (no Elementor, Divi or WPBakery), 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. No page builders. 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.

Main landing →

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.

Head differentiator →

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.

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CRO

CRO + A/B testing

Heatmaps, session recordings, funnel analysis. ICE-prioritized hypotheses. Server-side tests with GrowthBook. +32% average CVR in 90 days.

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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.

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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.

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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.

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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.

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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.

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Tech stack · no hidden debt

Custom WordPress without page builders. No future debt.

Elementor, Divi and WPBakery ship 300+ KB of CSS/JS that Core Web Vitals punishes and nobody cleans up. 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

01
PHP 8.2 + WordPress 6.x
Backend runtime · native Gutenberg · partial FSE
Core
02
ACF Pro
Editorial control · field groups versioned in acf-json/
Core
03
SASS + esbuild
Local build pipeline · JS < 50 KB gzip · zero jQuery
Perf
04
Imagify
AVIF · WebP · <picture> srcset responsive · LCP optimization
Perf
05
WP Rocket
Cache · delay JS · critical CSS · font preload
Perf
06
Yoast SEO Premium
Redirects · schema · indexing · canonical · XML sitemap
SEO
07
GrowthBook
Server-side A/B tests · CRO experimentation · feature flags
CRO
08
GTM server-side
GA4 + Meta CAPI + LinkedIn CAPI + closed-loop CRM
Analytics

See AI Products · stack boosted with AI →

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.

Weeks 1–2Audit included

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.

Weeks 3–6Continuous staging

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.

Weeks 7–8Lighthouse 95+ guarantee

Real cases · verifiable numbers

Custom websites with conversion impact.

Eninter Ascensores case — custom WordPress rebuild + CRO

B2B Industrial · 9 months

Lighthouse 96

Eninter: builder-free custom WordPress rebuild + CRO industrial landings = +5,400 leads with LCP < 1.1 s.

WP CustomCROCore Web Vitals

View case →

Mirror in the Sky cashmere case — content-led headless ecommerce

Premium ecommerce · 3 years

+63% sales

MITS cashmere: content-led ecommerce rebuild + cart CRO = +63% sales in 3 years.

EcommerceCRO

View case →

Proddigia real estate case — CRO landing pages

Real estate · 6 months

+400 /mes

Proddigia: CRO landing pages wired into Paid Media with CPL €32.60.

Landings CROA/B tests

View case →

See all cases 32 cases published

Web Development Truths 2026

Six things your agency isn’t telling you.

Elementor, Divi and WPBakery ship 300+ KB of CSS/JS that CWV punishes and nobody cleans up.

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.

★★★★★ 4.9 / 5 · 34+ verified reviews

See all on Google →

Frequently asked questions

What CMOs and CTOs ask us before signing.

How much does a custom B2B website cost?

Three rough tiers: Starter €12K (corporate site 8-15 pages, custom theme, Gutenberg, up to 4 custom blocks). Grow €28K (site + blog + services + landing system + CRO setup + A/B framework). Scale custom (ecommerce, multi-language, CRM/ERP integrations, headless where it fits). Monthly maintenance billed separately. No pay-per-hour. Fixed scope.

Why don’t you use Elementor / Divi / WPBakery?

Page builders ship 300+ KB of CSS/JS that Core Web Vitals punishes. They add dependencies that block WP updates. They create editorial vendor lock-in. And they produce markup that SEO+GEO can’t optimize. For serious B2B websites the future cost is always higher than the upfront savings. Our stack: Gutenberg + custom blocks + ACF Pro = editorial without tech debt.

What company size is a good fit?

B2B companies between €500K and €100M with a sales cycle > 30 days. Typical sectors: SaaS, industrial, legal tech, health, education, fintech, premium consulting, ecommerce > €2M. If you’re pure DTC with AOV < €100 or you need a one-pager in 2 weeks, we’ll refer you to agencies that fit better — that’s not our sweet spot.

What happens to our SEO during a rebuild?

Validated zero-loss protocol: we keep slugs, Yoast redirects (1,856 in our reference case), ACF schema_jsonld, canonical, robots.txt. Pre-deploy audit: Lighthouse + GSC + Rank Math + SE Ranking baseline. Post-deploy: 100% pass on 301 redirects audit, GSC URL Inspection on top-20, real-user Core Web Vitals. Guarantee: zero organic drop > 5% in the 30 days after cutover or we refund the setup phase.

Can we edit the site without you afterwards?

Yes, that’s the point. Gutenberg + ACF Pro + custom blocks let us ship editorial control without code dependencies. 2-hour training with your team in the final sprint. Documented SOPs. Operational handoff guaranteed. Need a new block or custom feature? Maintenance covers 4 h/month, otherwise we quote it separately.

How long does the project take?

Starter 6 weeks: audit + design 2, build 3, launch 1. Grow 8-10 weeks: audit + design 2, build 5-6, CRO + launch 2. Scale custom: 12-20 weeks depending on scope. Two-week sprints with a live demo every Friday. Staging available from day 10 so stakeholders can validate. Zero surprises at go-live.

What is the Lighthouse 95+ guarantee?

If at go-live mobile Lighthouse isn’t ≥ 95 on Performance + SEO + Accessibility + Best Practices for the key URLs (home + 3 services + 1 case), we extend optimization for free until it is. Applies with HTTP/2 + Brotli + TLS 1.3 compatible hosting and no client-imposed third-party plugins. No asterisks in the contract.

Only 3 slots per month? Why?

A custom B2B website needs 6-10 weeks with a senior team (lead dev, designer, strategist). We cap active new projects at 3/month to guarantee focused attention. If slots are full you go on the waitlist and we flag you 2 weeks before the next available kick-off. Priority goes to clients with an in-house operation ready to go (clean brief, committed stakeholders).

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.

Lighthouse 95+ guarantee at go-live or we extend optimization for free.