CRO Specialist — Data-Driven Conversion Experiments

Proton; Madrid; On-site; EUR 42,000 - 68,000; Full time

Benefits offered by this job

Technology

Learning & Development

Health coverage

Stock options

Flexible working

Office collaboration

Job summary

Proton is seeking a CRO Specialist to support our Marketing team in improving conversion across our marketing websites and landing pages, spanning traffic from SEO, performance marketing, affiliates, and partnerships.

You will help run a steady cadence of experiments and landing page iterations that improve key funnels such as acquisition, signup, and upgrade, ensuring tests are well scoped, properly measured, and clearly documented.

Qualifications

• An experimentation mindset focused on measured improvements across acquisition, signup, checkout, and upgrade funnels.
• 1–3 years of experience in conversion rate optimisation with clear examples of measurable impact.
• Ability to translate insights into hypotheses, metrics, and guardrails for A/B tests.

Responsibilities

• Write and refine hypotheses, draft experiment briefs, and align on primary metrics and guardrails.
• Review funnel performance with Data/Analytics to identify bottlenecks and prioritize tests.
• Coordinate with Product, Engineering, and Analytics on events, tagging, and dashboards for reliable readouts.
• Partner with Design, Content, and channel owners to tailor landing pages to traffic intent.
• Create, iterate on, and QA landing pages and variants across devices in the CMS workflow.
• Document outcomes and learnings to accelerate future testing and cross-team collaboration.

Skills

Experimentation mindset

Conversion rate optimization

Growth marketing exposure

QA and launch support

Job description

Proton is seeking a CRO Specialist to support our Marketing team in improving conversion across our marketing websites and landing pages, spanning traffic from SEO, performance marketing, affiliates, and partnerships.

You will help run a steady cadence of experiments and landing page iterations that improve key funnels such as acquisition, signup, and upgrade, ensuring tests are well scoped, properly measured, and clearly documented.