About this role.
Ruby Labs is seeking a Senior CRO Manager to lead end-to-end conversion optimization cycles for its consumer products. The role involves deep data analysis, hypothesis generation, high-fidelity mockup creation, and collaboration with engineers to implement and analyze A/B tests. This position carries a clear target of 15% quarterly conversion growth and offers performance-based bonuses for high achievers. The ideal candidate will have 3+ years of proven CRO experience, strong UI/UX design skills, and a self-driven ownership mentality. Remote work is available for candidates within ±4 hours of CET, and the company emphasizes a fast-paced, merit-based environment.
Role DNA
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Job Complexity
4/5Pace & Pressure
5/5Autonomy Level
5/5Communication Load
5/5Salary analysis
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Core skills
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Cover letter sample
Dear Hiring Manager,
I am excited to apply for the Senior CRO Manager role at Ruby Labs. With over 3 years of hands-on CRO experience in subscription and SaaS funnels, I have a proven track record of delivering double-digit conversion growth through data-driven experimentation. I thrive in environments where I can own the full optimization cycle—from analysis and mockups to implementation and analysis. Your emphasis on measurable impact and performance-based rewards aligns perfectly with my professional philosophy.
I look forward to the opportunity to contribute to Ruby Labs' ambitious growth.
Sample interview questions
I start by analyzing funnel metrics and user behavior data to identify drop-off points, then form hypotheses based on qualitative and quantitative insights. I prioritize using frameworks like PIE (Potential, Importance, Ease) to maximize impact. I also consider the statistical significance requirements and testing capacity.
I provide detailed functional and visual specs, including high-fidelity mockups and CSS guidelines. I also create QA checklists and do pre-deployment cross-browser testing. I work closely with engineers to resolve any technical issues and ensure the test runs as designed.
In my previous role, a test on a pricing page redesign showed no significant lift. I analyzed the data, segmented by traffic source, and found that the new design actually hurt mobile conversions. I reverted the test and used the insights to launch a mobile-specific redesign that increased conversions by 8%.
I look at the statistical significance, the lift size, and the confidence intervals. I also consider practical implications like implementation cost and user experience impact. Once I'm confident, I work with engineering to fully roll it out and monitor long-term metrics to ensure the lift is sustained.
I focus on business impact: explaining in terms of revenue, conversion rate changes, and confidence level. I create visual reports and a one-page summary of the test hypothesis, results, and recommendations. I always frame results with the next steps.
About us
Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we’re always looking for passionate individuals to join us. Learn more about our story at: https://rubylabs.com/about-us/
About the role
Ruby labs is looking for a Senior CRO Manager – someone who lives and breathes conversion optimization and delivers measurable results. In this role, you’ll have a clear mission: deliver 15% conversion rate growth in a quarter.
Unlike companies where CRO specialists simply make recommendations, you’ll drive the entire process: from data analysis and hypothesis generation to creating high-fidelity mockups, collaborating with developers on implementation, and ultimately owning the performance outcomes.
We’ve built a compensation structure that directly rewards those who exceed targets – top performers see substantial financial growth tied directly to their impact. If you’re ready to apply your optimization talents in an environment where excellence is expected and rewarded, we want to talk to you.
Responsibilities
Lead end-to-end optimization cycles: research → hypothesis → design → testing → rollout.
Perform deep funnel analysis and competitive benchmarking to uncover high-impact opportunities.
Design high-quality UI/UX mockups that clearly communicate your vision and maintain brand integrity.
Partner with engineers to ensure flawless test implementation and deployment.
Maintain uncompromising attention to detail and quality throughout the process.
Analyze test outcomes with statistical rigor, making confident scaling decisions.
Document learnings and build a systematic testing roadmap for continuous conversion growth.
Present insights and results clearly to stakeholders, building alignment and momentum.
Qualifications
Proven CRO Results: 3+ years of hands-on CRO experience, ideally with subscription or SaaS funnels, with documented performance lifts.
Design Sensibility: Strong UI/UX understanding , able to create compelling, detailed mockups.
Analytical Expertise: Skilled in platforms such as Google Analytics, Mixpanel, Growthbook (or similar).
Execution Excellence: Remarkable attention to detail with a bias for action in fast-moving environments.
Ownership Mentality: Self-driven, proactive, and comfortable being fully accountable for performance outcomes.
Communication: Clear, persuasive communicator with strong English skills (written and spoken).
Fluent English: Strong written and verbal communication skills
Nice to Have
Exposure to marketing attribution models, UTM parameters, and ROAS measurement.
Strong project management skills with the ability to prioritize and execute quickly.
Bachelor’s degree in a relevant field.
What We Offer to High Performers
We value ambitious professionals who deliver results. We offer:
A merit-based environment where performance directly impacts compensation
Substantial bonus structure tied to exceeding KPI targets
Rapid career advancement for those who consistently deliver
Autonomy to implement your vision without bureaucratic barriers
Opportunity to work with a team that moves fast and values excellence
If you’re a CRO professional who thrives on measurable impact, loves owning the full optimization process, and wants compensation directly tied to your performance, we want to talk. This role is for someone who doesn’t just want to suggest improvements – but wants to create them, implement them, and be rewarded for their success.
Location
Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately ± 4 hours of CET. This ensures optimal collaboration and communication during working hours.
Benefits
Discover the perks of being part of our vibrant team! We offer:
Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance.
Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days.
Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.
Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them.
Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here: https://docs.google.com/document/d/1nkrN76JlZkbKj9WSOhlT1_mni_CZeDkHdwfIjPXVwvk/preview?tab=t.0#heading=h.ndsdl4wapxtt
Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!
Interview Process
After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps:
Recruiter Screening (40 minutes)
Technical Interview (90 minutes)
Final Interview (60 minutes)
Life at Ruby Labs
At Ruby Labs, we move fast, aim high, and expect the same from our team. We’re not here to play small—we’re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day.
This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you’re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen.
Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more—more responsibility, more growth, and more success.
#LI-Remote
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