Sr. Staff Engineer, Growth

Polymarket's Growth Engineering team owns the systems that determine how people discover the platform, what they do once they arrive, and whether they return — including analytics infrastructure, martech integrations, experimentation frameworks, and full-stack growth features. This Sr. Staff Engineer role is the technical foundation of that team: owning architecture decisions, building and maintaining the Go-based data pipelines growth depends on, setting standards for experiment design, and shipping full-stack features end-to-end as a hands-on senior individual contributor rather than a coordination role.

• Build and maintain Go-based data pipelines powering growth analytics and reporting
• Audit existing martech integrations and replace or retire underperforming tooling
• Architect and ship experimentation infrastructure for clean, trustworthy A/B testing
• Ship full-stack growth features in Go and TypeScript from backend to frontend
• Bring machine learning into production for personalization and predictive modeling
• Review experiment designs and code from other growth engineers to raise team quality

• 10+ years spanning full-stack development, data/analytics infrastructure, and martech systems
• Production-level expertise in Go and TypeScript
• Track record designing analytics and data pipelines relied on in production
• Hands-on experience shipping ML systems into production, not just experimentation
• Strong systems thinking for architectural tradeoffs (refactor vs. rewrite)
• Experience setting technical direction for a growth or data team under ambiguity

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