Senior CRO Manager: D2C Growth & Experiments

Ruby Labs Ltd; España; Remote; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Remote Work Environment

Unlimited PTO

Paid National Holidays

Company-provided MacBook

Flexible Independent Contractor</n>

Job summary

Ruby Labs Ltd is seeking a hands-on Senior CRO Manager to drive conversion growth for one of our core D2C subscription products. You will own the entire experimentation pipeline, from hypothesis to launch, working with the CRO Lead to grow statistically validated winners across the funnel.

This high-impact role requires mastery of funnel analytics, rigorous result interpretation, and close collaboration with data, product, and engineering teams.

Qualifications

• 3+ years running A/B tests on a D2C subscription or consumer web product.
• Hands-on proficiency in Mixpanel or a close equivalent - building funnels, segmenting by device and geography, and reading cohort behaviour.
• Working knowledge of significance, power, sample size, and common pitfalls.
• Experience with a feature-flag or A/B testing platform (GrowthBook, Statsig, or close equivalents).
• Ability to write and critique conversion copy and page layouts, grounded in behavioural psychology.
• Active daily use of AI tools (Claude or equivalent) to accelerate concept, analysis, and prototype work.
• Familiarity with consumer protection rules for subscription products and marketing claims is a bonus.

Responsibilities

• Experiment Pipeline: Own the A/B test backlog from hypothesis to launch and prioritise ideas by impact, confidence, and effort.
• Funnel Analysis: Analyse the funnel in Mixpanel to find drop-offs and opportunities across devices and locales, and turn them into testable hypotheses.
• Test Analysis & Verdicts: Read results with statistical rigour, separate winners from noise, and prepare clear verdicts for sign-off.
• Test Specification & QA: Write test specs and variant briefs that developers can build without follow-up questions.
• Conversion Copy & Layouts: Produce conversion-oriented copy and layout variants within compliance constraints.
• Documentation & Reporting: Keep every test documented in Notion with hypothesis, setup, result, and learning, and contribute to leadership reporting.
• Mentoring: Support a junior CRO specialist on test design, analysis, and documentation standards.

Skills

CRO / Experimentation

Product Analytics

Statistics

Experimentation Platforms

Conversion Copy & UX

AI Tooling

Compliance

Tools

Mixpanel

GrowthBook

Statsig

Job description

Ruby Labs Ltd is seeking a hands-on Senior CRO Manager to drive conversion growth for one of our core D2C subscription products. You will own the entire experimentation pipeline, from hypothesis to launch, working with the CRO Lead to grow statistically validated winners across the funnel.

This high-impact role requires mastery of funnel analytics, rigorous result interpretation, and close collaboration with data, product, and engineering teams.