Freelancer profile translated to English.
Back to original languageAbout Cristóbal
A/B testing tools are powerful, but poor front-end implementations often lead to broken designs, performance issues, flicker, or unreliable data.
I help companies safely implement A/B tests on live, high-traffic websites.
I don't use your A/B testing tool's visual editor. I develop directly with code using JavaScript, CSS, and HTML.
This service is for teams that need a front-end developer who understands experimentation, not just design or marketing.
Front-end implementation of A/B and experience tests
DOM manipulation, JS logic, and CSS isolation
Pre-launch QA (layout, performance, tracking)
Debugging broken or inconsistent experiments
Safe deployments with rollback capability
I have over 10 years of experience working with enterprise experimentation tools, including:
Adobe Target (advanced experience)
Optimizely
VWO
Custom internal testing frameworks
If you need A/B tests implemented correctly, not just quickly and riskily, this service is for you.
Spanish
Native or bilingual
French
Native or bilingual
English
Native or bilingual
Remote only
Primarily works remotely
Experience
- OpenbankDigital Optimization Manager - CRO - Growth HackingNovember 2022 - Today (3 years and 7 months)Madrid, SpainImplementation and front-end development of experimentation, CRO, and AB Testing using front-end code with Adobe Target
- Autonocion.comCo-Founder, Product Manager, CRO & UXApril 2011 - January 2026 (14 years and 9 months)• • Design: optimization of the UX/UI of the portal to offer the best possible experience• • Advertising: I manage advertisers and various monetization sources CPM, CPC, CPL, etc.• • SEO: On-page and off-page optimization to increase organic traffic• • WPO: Page load optimization• • Social Media Marketing: automation of social platforms and social media campaigns• • Tracking of strategic KPIs and billing management
- BNP Paribas Personal FinanceDigital Product Manager, CRO & UX SpecialistSeptember 2015 - November 2022 (7 years and 2 months)Madrid, SpainIn addition, I am responsible for implementing CRO and AB Testing strategies and use cases to optimize the usage and hiring flows of various products, making UX/UI improvements in all digital assets and monitoring the main digital KPIs of each product I manage.As an agile coach, I helped implement Scrum methodologies to help other departments and companies within the BNP group adopt new methodologies and work tools for their projects and in their daily lives.
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Education
- European School of Brussels
- Google Ads Certified Partner Google Analytics Individual Qualification Professional Scrum Product Owner (PSPO I) Cambridge Advanced in EnglishGoogle Ads Certified Partner Google Analytics Individual Qualification Professional Scrum Product Owner (PSPO I) Cambridge Advanced in English