Join Proton and build a better internet where privacy is the default. Proton was founded in 2014 by scientists from CERN on a simple truth: privacy is a fundamental human right. Since then, we’ve built the world’s largest encrypted email service (Proton Mail) and expanded into Proton VPN, Proton Drive, Proton Pass, and Proton Calendar — tools used by millions globally to protect their freedom, fight censorship, and keep their data safe. In some situations, Proton has literally helped save lives. We are profitable, independent (no VC control), and selectively hire from the top 1% of applicants. Our 500+ team members across 50+ countries come from leading organizations and elite academic backgrounds. We move fast, keep hierarchy light, and prioritize impact over optics. If you want to do meaningful work with exceptionally high-caliber people, this is it. Join us and do work you can truly be proud of.

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Role overview




We are looking for a CRO (Conversion Rate Optimisation) Specialist to support Proton’s 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, sign‑up, and upgrade, ensuring tests are well‑scoped, properly measured, and clearly documented. You will collaborate closely with Design, Engineering, Product, and Analytics teams plus channel owners, to turn insights into high‑quality tests and ship changes that measurably improve user outcomes.

What you’ll do

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- Be part of end‑to‑end experiment scoping and preparation by helping write and refine hypotheses, draft experiment briefs, align with the team on primary metrics and key guardrails, and translate requirements into the la

📌 CRO Specialist (Barcelona)
🏢 Proton
📍 Barcelona