CRO Manager

Ruby Labs is a leading tech company that creates and operates innovative consumer products across the health, education, and entertainment industries. The Senior CRO Manager will drive conversion growth for one of the core D2C subscription products, being fully responsible for a continuous pipeline of A/B tests from hypothesis and prioritisation through launch, analysis, and documented verdicts, working with the CRO Lead. Applicants must be located within approximately ±4 hours of CET. The interview process includes a Recruiter Screening (40 minutes), a Technical Interview (60 minutes), and a Final Interview (60 minutes).

Responsibilities

Own the A/B test backlog from hypothesis to launch, prioritising by expected impact, confidence, and effort; Analyse the funnel in Mixpanel to find drop-offs, friction points, and segment-specific opportunities, and turn them into testable hypotheses; Read test results with statistical rigour, separate winners from directional trends and noise, and prepare verdicts for sign-off with the data team; Write test specs and variant briefs that developers can build without follow-up questions, and check every variant before and after launch; Produce conversion-oriented copy and layout variants that stay within compliance constraints on product claims; Keep every test documented in Notion with hypothesis, setup, result, and learning, and contribute to experimentation reporting for leadership; Mentor a junior CRO specialist on test design, analysis, and documentation standards

Requirements

3+ years running A/B tests on a D2C subscription or consumer web product, with results attributable to own work; Hands-on proficiency in Mixpanel or a close equivalent (building funnels, segmenting by device and geography, reading cohort behaviour); Working knowledge of significance, power, sample size, and pitfalls such as peeking and sample ratio mismatch; 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; Holds a high bar for own work and the team's; Constantly learns and adopts new tools and methods; Ambitious; Explains decisions clearly in writing; Communicates clearly and proactively in a remote, async environment

Nice to have

Familiarity with consumer protection rules for subscription products and marketing claims

Benefits

Remote work environment; Unlimited PTO; Paid national holidays; Company-provided MacBook; Flexible independent contractor agreement with tax advantages, networking opportunities, reduced employment obligations, and freedom to work from anywhere; Performance directly and significantly rewarded; Opportunity to take on bigger scope quickly