Growth Engineer at pubGENIUS in Budapest, Central Hungary, Hungary

pubGENIUS is a AdTech startup and we're looking for a Growth Engineer to own the full experimentation loop from infrastructure to insight to implementation. This is a high-leverage, high-autonomy role: you'll build the systems that let us run experiments, instrument the metrics that tell us if they're working, and ship the changes that move the needle on growth.

You won't just be executing a backlog. You'll be generating ideas, validating them with data, and iterating fast.

What You'll Do

Build the experimentation foundation

• Design and maintain the A/B testing infrastructure for our website and mobile app
• Build data pipelines that capture user behavior and surface experiment results clearly and quickly
• Instrument analytics so we always know what's happening and why

Run experiments end-to-end

• Implement test variants from copy tweaks to new onboarding flows to feature experiments
• Define success metrics and measure the true impact of each change
• Analyze results, document learnings, and translate findings into next steps

Drive growth ideas

• Proactively generate hypotheses based on data, user behavior, and best practices from high-growth companies
• Prioritize and pitch ideas for greenlight; own execution on approved experiments
• Stay close to the product and business to identify the highest-leverage growth opportunities

What We're Looking For

• Familiarity with both frontend and backend development, with the ability to ship full-stack features and experiments end to end

• Experience building or working with A/B testing frameworks and analytics pipelines

• Data-driven mindset: you know how to design a clean experiment, read the results honestly, and avoid common pitfalls like p-hacking or novelty effects

• Product intuition you think like a user and naturally generate ideas that could improve activation, retention, or conversion

• Bias toward action and ownership; you don't wait to be told what to build next

• Familiarity with growth practices at consumer tech companies

Nice to Have

• Experience as the first or only growth engineer at a startup
• Background in growth, lifecycle, or product analytics roles
• Familiarity with tools like Mixpanel, Amplitude, Segment, LaunchDarkly, or similar

Why This Role

You'll have real ownership over a critical part of the business with a short feedback loop between your work and its impact. This isn't a support role it's a foundational one. The infrastructure you build and the experiments you run will directly shape how the product grows.

• Fully remote From EU or North America
• Flexible hours with some overlap with Pacific Standard Time (PST)
• 28 Paid vacation and sick days

We do not work with staffing agencies or third-party recruiters. Direct applicants only.

pubGENIUS is an Equal Opportunity Employer; employment with pubGENIUS is governed on the basis of merit, competence, and qualifications and will not be influenced in any manner by race, age, colour, gender, religion, national origin/ethnicity, veteran status, sexual orientation, marital status, gender identity, mental or physical disability, or any other legally protected status.