Senior Software Engineer, Full-Stack (PSA Liquidity Platform)

Collectors is the leading creator of innovative technology that provides value-added services for collectors worldwide. They are seeking a Senior Software Engineer to build the PSA Liquidity Platform, focusing on enhancing buyer and seller experiences while maximizing market efficiency.

Responsibilities:

• Build powerful buyer tooling. Lead development of our next-generation buyer platform: targeting, campaign management, budget controls, and analytics that let every type of buyer — from individual collectors to large-scale dealers — discover and acquire the right cards at scale
• Build and optimize the matching engine. Partner with Engineering and AI/ML to build a sophisticated, real-time targeting and ranking engine that maximizes GMV, conversion, and offer-to-sale velocity across channels
• Architect for scale. Design and operate microservices and distributed, event-driven systems that power instant, accurate offers across millions of collectibles — with the low latency and reliability our customers expect. You'll make pragmatic, high-conviction architecture calls and own the quality of what you ship across the full stack
• Elevate the seller experience. Make it effortless for sellers to understand their options, price their items accurately, and complete a sale with minimal friction
• Take an AI-first approach to building. Use AI tooling across the development lifecycle to move faster and raise quality, and bring a strong point of view on how AI changes the way we design, build, and operate software
• Own outcomes end-to-end. Take projects from 0 to 1 — from an ambiguous problem to a shipped, instrumented, production product — and wear whatever hat the moment requires, whether that's frontend, backend, infrastructure, or data
• Drive cross-functional execution. Translate strategy into clear technical plans, specs, and user stories. Coordinate delivery across dedicated and partner engineering teams, and keep stakeholders aligned and projects moving
• Connect the ecosystem. Ensure seamless liquidity handoffs across the broader PSA enterprise, from Grading to Collection Management to Vaulting, reducing friction and resolving cross-system dependencies that span payments, logistics, and risk
• Communicate with clarity at every level. From executive reviews to engineering standups, synthesize complexity, articulate tradeoffs, and bring people with you — clearly, in writing and in person

Requirements:

• 6+ years engineering experience. You have a track record of designing, shipping, and scaling products 0-to-1 that have measurable business impact. Ideally 2+ years operating as a Senior IC or equivalent technical leadership level at a high-growth company or a scaled consumer platform
• Full-stack range. You have strong proficiency in Java (Spring Boot) and equally comfortable in modern frontend frameworks like React and Svelte, moving fluidly across the stack
• Distributed-systems depth. You've designed and operated microservices and Kafka-based event-driven architectures, run workloads on Kubernetes, and know your way around the AWS ecosystem
• Observability-first mindset. You instrument what you ship using tools such as Datadog, New Relic, or OpenTelemetry. You're comfortable building dashboards, setting up monitoring/alerting, and using distributed tracing to debug production issues
• AI-first engineer. You build with AI tooling across the SDLC - from planning and code generation to review and debugging. You lean on your experience to make high-conviction calls quickly
• Systems thinker and customer focused. You naturally decompose complex, multi-service systems into clean boundaries and intuitive interfaces, without losing sight of the customer experience
• Influential communicator. A strong written and verbal communicator who aligns engineers, product partners, and stakeholders without direct authority, makes crisp calls, and brings people with you
• Bias for ownership. You have an extreme ownership mindset and will wear any hat required to get the job done. You thrive in a fast-moving, self-directed environment — you set the bar, hold it, and take full accountability for outcomes
• Passion for collecting is a plus