CRO Specialist

Proton AG; Greater London; On-site; GBP 55,000 - 85,000; Full time

Job summary

Proton Technologies AG in London is seeking a CRO Specialist to optimize conversion across marketing websites and landing pages. You will lead experiment scoping, measurement alignment, and rapid iteration of tests that improve acquisition, sign‑up, and upgrade funnels.

You will partner with Design, Engineering, Product, and Analytics to ensure robust test readouts, solid tracking, and actionable insights. A user‑first mindset and strong collaboration are essential to succeed in a fast-paced

Qualifications

• 1 to 3 years of experience in conversion rate optimisation and experimentation.
• Exposure to growth, lifecycle, or performance marketing with measurable results.
• Ability to translate insights into hypotheses, metrics, and guardrails.
• Strong analytical foundations for funnel performance and decisions.
• Tracking and measurement literacy with events, tagging, and dashboards.
• Hands-on landing page optimisation using CMS/page builders with cross‑device care.

Responsibilities

• Scope and prepare experiments, draft briefs, and align metrics before launch.
• Review funnel performance with Data/Analytics and translate into test ideas.
• Collaborate with Product, Engineering, and Analytics on measurement needs.
• Coordinate with Design, Content, and channel owners on messaging and intent.
• Create, iterate on, QA landing pages and variants across devices.
• Document outcomes and learnings to enable faster future iterations.

Skills

Experimentation mindset

Growth marketing

Lifecycle marketing

Performance marketing

Tools

CMS/Page builder

Job description

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.

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 prioritised 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 pages and 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 time and enable faster iteration across future tests and 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 in conversion rate optimisation and 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 metrics and 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 Product and Engineering on events, tagging assumptions, and dashboards so results are reliable.
• Hands‑on landing page optimisation: build, iterate, and QA pages and variants in a CMS/page builder, with strong attention to detail across devices.
• Strong cross‑functional collaboration and documentation: coordinate with Design, Engineering, Product, and channel owners, and document learnings so iteration gets faster.

What We Offer

• Work that Matters: millions of people trust Proton with their privacy. We answer only to our users — not advertisers, not investors with conflicting agendas, not governments. The work you do here is real, and the impact is measurable.
• Work with smart and dedicated people – our team is diverse, collaborative, and tight‑knit with people from all walks of life, including many of the world’s top academic institutions and organizations.
• Technology: you'll get the right hardware and the right software you need to do your best work.
• Learning & Development: we invest in your growth because sharp people make us better. Proton offers fast career acceleration with real ownership from day one.
• Employee Benefits: strong health coverage, solid retirement options, generous leave, and wellness support so you can bring your best self to work every day.
• Stock Options: at Proton, we all have the opportunity to be owners of the company. From day one, you have a real stake in what we’re building. When Proton wins, you win.
• In‑Person Collaboration: amazing things happen when passionate, smart, and purposeful people get together in the same room. With offices across Geneva, Zürich, Barcelona, London and more, you’ll spend most of your time collaborating face‑to‑face with people who genuinely care about what they’re building.
• Food: lunch and snacks are on us every day in our offices.
• Transport: we cover public transport, bike allowances, or parking.
• Flexible Working: you own your schedule. Set hours that work for you and your team — because outcomes matter more than when the clock says you started.

Our Commitment to Diversity and Inclusion

At Proton, we believe diversity drives innovation and strengthens our mission to provide privacy as a default for all. We are committed to fostering an inclusive environment where all individuals, regardless of race, ethnicity, gender, age, sexual orientation, physical ability, or socio‑economic background, feel valued and empowered. We strive to create equal opportunities, promote open dialogue, and support continuous learning to ensure every voice is heard and respected.

If you need any extra support or reasonable adjustments during the hiring process, please let your talent partner know.

Candidate Privacy Notice

When you apply for a position, refer a candidate, or are considered for a role at Proton Technologies AG (Proton, we, us, or our), your information is stored in Greenhouse, in accordance with their Service Privacy Policy. This information is used to evaluate your suitability for the posted position. We also retain this information for consideration for future roles that you may apply for or that we believe may align with your background and skills. If we no longer have a legitimate business need to process your information, we will either delete or anonymize it. Should you have any inquiries about how we use or manage your information, or if you wish to access, correct, or delete your data, please contact our privacy team at [e-mail].

Proton does not accept unsolicited resumes from any sources other than directly from candidates, and we will not pay a fee for any placement resulting from an unsolicited offer, even if the candidate is subsequently hired by Proton. To learn more about our privacy policy, please visit our privacy policy page.