CRO Specialist

Location: Barcelona Remote work allowance: Yes, up to 30% of the time working from home is allowed while enjoying three core days in the office. Employment type: Not explicitly stated (likely full-time based on context). Experience level: Mid-level (1 to 3 years of experience in conversion rate optimization and experimentation).

Job Description

Join Proton and build a better internet where privacy is the default At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online. Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive, and Proton Pass. These tools empower individuals and organizations to take control of their personal data, break away from Big Tech’s invasive practices, and defeat censorship. Our work impacts hundreds of millions of lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive information. In some cases, Proton’s services have even been instrumental in saving lives by enabling secure and private communications in high-risk situations. Proton today supports over 100 million user accounts with a growing team of over 500 people from over 50 different countries, from the world's top companies and universities. We value intelligence, learning potential, and ambition in our hiring process. Adaptability is key as we navigate uncharted territories and redefine how business is conducted online. We believe smaller teams of exceptional talent will always prevail over larger teams with lower talent density. Proton has become profitable and reached scale without relying upon VC funding, largely due to superior talent that allows us to do things faster, more creatively, and more efficiently. We have a global mindset and big ambitions but remain a start-up at heart. We value empowerment and flexibility and keep our structure flat to keep moving fast and avoid unnecessary politics. Tired of blending into the crowd? Join us and do work you can truly be proud of. Check our social media pages to learn more about us: Twitter, Reddit, Instagram.

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

• 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 landing page/page-variant updates needed ahead of launch.
• Work in close alignment with the Data/Analytics team to review funnel performance, understand drop-offs and bottlenecks, and translate insights into prioritized test ideas and clear next actions.
• Coordinate with Product, Engineering, and Analytics to align on measurement needs (events, tracking plans, tagging assumptions, dashboards) so experiment readouts are reliable and consistent.
• Partner with Design, Content, and marketing channel owners to adapt landing page messaging and structure to match traffic intent and channel needs (Organic, Performance Marketing, Affiliates, and Influencers).
• Create, iterate on,and QA landing pagesand experiment variants in the page/content publishing workflow, ensuring consistency across devices and key entry points.
• Document experiment outcomes, decisions,and learnings in a structured way so insights compound over timeand enable faster iteration across future testsand teams.

Job requirements

• An experimentation mindset: you are curious, structured,and guided by a user-first mindset, focusing on measurable improvements across acquisition, sign-up, checkout,and upgrade funnels.
• 1 to 3 years of experience inconversion rate optimizationand experimentation, with exposure to at least one of the following areas: growth, lifecycle, or performance marketing,and clear examples of measurable conversion impact.
• Ability to translate insights into clear hypotheses, define primary metricsand guardrails,and support A/B tests through launch, QA**,and readout.
• Solid analytical foundations: comfortable reviewing funnel performance, spotting drop-offs,and turning results into prioritised next actions with Data/Analytics.
• Tracking and measurement literacy: able to align with Productand Engineering on events, tagging assumptions**,and dashboards so results are reliable.
• Hands-on landing page optimisation: build, iterate,and QA pagesand variants in a CMS/page builder**, with strong attention to detail across devices.
• Strong cross-functional collaborationand documentation: coordinate with Design, Engineering, Product,and channel owners**,and document learnings so iteration gets faster.​

What We Offer

• Office First: Collaboration is easier and more effective in person; offices located in Geneva, Zurich, Prague, Barcelona, Paris, London, Vilnius, Skopje, Taipei*. Work from home allowed up to 30% of time.
• Technology: Devices*and software provided.
• Food: Lunch*and snacks provided daily at offices.
• Transport: Support for transport costs via subsidies for public transport, bike allowances, or parking spaces depending on office location.
• Stock Options: All employees receive stock options upon joining.
• Flexible Working: Define your own working hours compatible with team meetings.
• Learning & Development: Training programs, conferences, events*, continual learning opportunities offered.
• Employee Benefits: Comprehensive health insurance plans, competitive retirement savings options, generous vacationand leave policies, wellness programs*.
• Work that Matters: Community-first organization funded solely by user subscriptions; over 100 million users trust Proton.

Skills Mentioned

• Conversion Rate Optimization (CRO)
• Experimentation mindset
• Growth marketing
• Lifecycle marketing
• Performance marketing
• A/B testing
• Funnel analysis
• Data/Analytics collaboration
• Event tracking & tagging assumptions
• Dashboard alignment
• CMS/page builder for landing page creation & QA
• Cross-functional collaboration (Design / Engineering / Product / Marketing)

Estimated Salary Range for CRO Specialist in Barcelona

Based on mid-level experience (1 3 years) for CRO Specialists in Barcelona or similar European tech hubs: 35,50, per year