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CRO Frontend Developer

Hybrid in Barcelona·Full-time·Added 2 days ago (last checked 4 Nov)

Dentsu

37 open roles

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Our summary

Hours: Jornada intensiva in summer
Work mode: Hybrid, Barcelona
Contract: Full-time
Spanish: Fluent
English: Required
Benefits: Private health insurance, flexible pay plan, meal vouchers

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Skills

This job advert was originally written in Spanish.

Pay & benefits

What you'll get

🌴 Vacations: 26 working days, 3 Wellness Days, a day off on your birthday 🎂, and December 24th and 31st off if they fall on a working day 🎉

⏰ Flexible schedule

🌞 Intensive summer schedule (from June 15th to September 15th)

🏡 Hybrid teleworking policy

📚 Professional development through the Dentsu University platform

💰 Attractive compensation package

🧾 Access to the flexible remuneration system (Medical insurance 🏥, Restaurant Vouchers 🍽️, Transport Card 🚇, Nursery Voucher 👶, Specific training 🎓...)

🤝 Employee Assistance Program

💚 2 days of volunteering, in line with our commitment to corporate responsibility and social impact

😊 Excellent working environment

🏆 We have achieved Top Employer accreditation in 2024, 2025, and 2026, and the Happy Trainees certification in 2025 and 2026. Both awards recognize Dentsu as a great employer brand!

The role

Dentsu is the leading group of the communication industry in Spain both qualitatively and quantitatively. For the 6th consecutive year, it heads the leader position in the InfoAdex ranking and in the latest RECMA report, achieving the largest advantage recorded in recent years.

In Spain, it has prominent agencies such as Carat (#1 InfoAdex ranking), iProspect (#3 InfoAdex ranking), dentsu X (#10 InfoAdex), dentsu Story Lab, Dentsu Creative, Merkle, Omega CRM, Evolf and other specialized brands, all of them focused on growing their clients' business.

With the best media services and solutions, CXM and creativity, dentsu belongs to a large global network and has more than 71,000 specialists operating in 120 countries and regions worldwide.

Join our talent network and be part of a company that not only leads the market, but also strives to create a vibrant future full of opportunities!

https://www.dentsu.com/

https://www.dentsu.com/es/es/trabaja-con-nosotros

What you'll do

We are looking for someone with an interest in digital experimentation, personalization, and user experience optimization to join our team as a CRO Frontend Developer.

In this role, you will contribute to the implementation of A/B tests and personalized experiences across our digital channels, working collaboratively with CRO, Product, UX, and Analytics teams to identify data-driven improvement opportunities and generate business impact.

Responsibilities

Implement A/B tests, multivariate tests, and personalization experiences using Adobe Target.
Develop and adapt front-end components for experiments using JavaScript, HTML, and CSS.
Validate and ensure the correct execution of experiments across different devices and browsers.
Collaborate in the analysis of results and in the identification of optimization opportunities.
Support the definition and validation of measurement and tracking for experiments.
Document learnings and contribute to the continuous improvement of experimentation processes.

Requirements

Experience in CRO (Conversion Rate Optimization) initiatives.
Experience in Adobe Target or similar experimentation and personalization platforms.
Knowledge of JavaScript, HTML, and CSS.
Familiarity with digital analytics tools such as Adobe Analytics or GA4.
Interest in experimentation, data analysis, and the optimization of digital experiences.
Fluent level of English and Spanish.

Inclusion and Diversity

At Dentsu, we value diversity and foster an inclusive environment where every talent can thrive. We are proud to be recognized for our sustainability strategy and our commitment to innovation and positive impact on the community. Our ambition is to build a fairer and more equal society. That is why we encourage applications from people with disabilities, of all ages, nationalities, backgrounds, and cultures. Dentsu is committed to equal opportunities between men and women.

Location: Barcelona - Av Diagonal 177

Brand: Dentsu Creative

Time Type: Full time

Contract Type: Permanent

About Dentsu

Dentsu is a global advertising and marketing services company, founded in Tokyo in 1901, with a presence in over 145 countries and regions. It operates through a network of agencies including Dentsu Creative, Carat, iProspect, dentsu X, and Merkle, delivering integrated services across Media, CXM (Customer Experience Management), and Creative, with a focus on end-to-end experience transformation and business transformation for major brands.

Industry: Advertising and Marketing Services
Founded: 1901
Employees: 50,000–100,000
Headquarters: Tokyo, Japan
In Spain: Madrid, Barcelona

Good to know if you are moving

Dentsu has a dedicated Spain office, with roles in media, creative, and technology, offering opportunities for international professionals.
The company operates in over 145 countries, providing a global network that may facilitate cross-border career mobility.
Dentsu's Spain operations are part of a large global organization, with a strong focus on digital transformation and data-driven marketing.
The company's careers page lists roles in Spain such as Salesforce Consultant, Data Engineer, and Frontend Developer, indicating a need for tech and data skills.
Dentsu emphasizes innovation and sustainability, which may appeal to professionals seeking a purpose-driven employer.

All open roles at Dentsu