CRO Specialist — Growth & Conversion Optimisation

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

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