Senior Software Engineer, Liquidity Platform (AI-First)

Collectors is seeking a Senior Software Engineer to build the PSA Liquidity Platform, connecting buyers and sellers across PSA Partner Offers and the eBay Consignment channel. You will own end-to-end design and delivery across frontend, backend, and data. You will work with Java (Spring Boot), React or Svelte, and Flutter where applicable, design microservices, implement real-time pricing and targeting engines with Kafka, Kubernetes, and AWS, and apply AI-first approaches to improve velocity and