
A/B Experiment Implementation
A/B test execution and UI/UX changes based on prioritized hypotheses. Covers test design, statistical setup, implementation in your testing tool, and analysis with documented winners and learnings.
What's included
- Hypothesis prioritization based on impact, confidence, and effort
- Test design with primary metric, guardrails, and sample size
- UI/UX changes built and QA'd across devices
- Implementation in your testing tool (PostHog, VWO, Optimizely, GA4 experiments)
- Statistical setup with proper traffic allocation and runtime
- Monitoring for sample ratio mismatch and data quality issues
- Results analysis with documented winners, losers, and learnings
- Shipping recommendations and follow-up test ideas
Why it matters
Most CRO programs stall because tests are poorly scoped, underpowered, or never properly analyzed. You get a steady pipeline of decision-grade experiments with a documented record of what works, what doesn't, and what to try next.
What clients say
“Tomas is an exceptional analytics expert. He helped us migrate a client from Universal Analytics to GA4, including creating GTM tags/triggers/variables, ecommerce tracking setup, other event tracking setup, and even built out funnels. This client had a unique shopping/enrollment checkout process, but the migration and configuration was launched without any issues. Highly recommended for any analytics work.”
Brian Thomas Clark
“Wow! I can't say enough about the team at SmartMetrics! They are super fast, intelligent, and helpful in understanding and addressing your problem. I have worked with them multiple times on different accounts. I highly recommend them! I will continue to use them going forward! Big shout out to Tomas for all his help!”
Anna Crowe
“We worked with Tomas to set up some tracking for marketing analytics on our website. I'd recommend working with him - he's communicative, efficient, and effective.”
Julia
Dyneti
Work with Tomas
Founder, SmartMetrics
20 years in marketing, CRO, CRM, and analytics, now with AI systems layered on top.


Get In Touch
You work with me directly, from scope to delivery.
Schedule a 15min Call