Upwave YC S12 Senior Software Engineer REMOTE US Full-time 150k- 175k bonus equity benefits

Upwave (YC S12) | Senior Software Engineer | REMOTE (US) | Full-time | $150k-$175k + bonus/equity/benefits | https://www.upwave.com/job/8547924002/ Upwave builds brand measurement software for large advertisers, agencies, and media partners. We process high-volume ad exposure + survey/event data and turn it into brand lift, reach validation, optimization recommendations, and AI-assisted analysis for enterprise marketers. We're looking for a senior full-stack/backend-leaning engineer who can be productive quickly in our JVM/Spring Boot stack. Recent production experience with Java, Kotlin, or similar is important for this role; we need someone who can help us ship and operate backend services without a long stack ramp-up. Strong candidates also bring Python, SQL/data modeling, AWS/Kubernetes/observability, and high-volume event or analytics pipeline experience. The work includes building APIs and data pipelines, productionizing analytics/statistical workflows with Product and Data Scie