🚀 Join the Future of Commerce with Whatnot!Whatnot is the largest livestream shopping platform in North America and Europe to buy, sell, and discover the things you love. Whether it's trading cards, fashion, electronics, or live plants, our sellers are building real businesses across hundreds of categories. We're building live commerce at a scale that's never been done in the West, and there's no playbook to copy. The people here are shaping how an entirely new industry develops. As a remote co-located team, we're inspired by our values and anchored in hubs across the US, UK, Ireland, Poland, Germany, and Australia. We move fast, stay close to our users, and focus on the work that drives the most impact. We're one of the fastest growing marketplaces and were recently named the #1 Best Startup Employer in America by Forbes. Check out the latest Whatnot updates on our news and engineering blogs and join us as we enable anyone to turn their passion into a business and bring people together through commerce. 💻 RoleThe Fraud Experience team builds intelligent, real-time systems that safeguard Whatnot’s marketplace from malicious activity. We design, develop, and deploy end-to-end, ML-driven systems that proactively identify and mitigate fraud — blending real-time detection with transparent, user-centered enforcement. What You'll Do - Lead the full architecture of fraud detection, prevention, and intervention systems — spanning machine learning, backend, and client-side components. - Build intelligent user graphs to model behavioral patterns, detect collusion networks, and uncover account connectivity at scale. - Design, train, and deploy both traditional ML and LLM-powered models to detect fraudulent activity across users, payments, and marketplace interactions. - Develop scalable data pipelines and real-time inference systems capable of supporting high-volume, low-latency ML workloads. - Create human-in-the-loop systems that continuously refine detection accuracy and adapt to evolving adversarial tactics. - Perform deep behavioral and adversarial data analysis to surface emerging fraud trends and drive continuous system improvement. - Stay ahead of the curve by translating new insights into adaptive, production-ready systems that evolve as fast as our adversaries. We offer flexibility to work from home or from one of our global office hubs, and we value in-person time for planning, problem-solving, and connection. Team members in this role must live within commuting distance of our Los Angeles, New York, San Francisco or Seattle hub. 👋 You People who do well at Whatnot tend to be comfortable figuring things out as they go, biased toward action, and genuinely curious about what they're building. They care more about outcomes than credit and stay close to the product and the people using it. As our next Software Engineer in Fraud team, you should bring 4+ years of software development experience in high-growth environments, along with a strong bias toward action and impact. What You’ll Bring - Bachelor’s degree in Computer Science, Statistics, Applied Mathematics, Economics, or a related technical field. - 4+ years of software engineering experience building systems for consumer-scale traffic and reliability. - 1+ years writing production-grade Python code and working with ML libraries (e.g. PyTorch, LightGBM). - 1+ years of experience in machine learning or fraud prevention domains. - Deep business intuition and a data-driven mindset — you think critically about how abuse prevention systems affect growth and user experience. - Fluency with data tooling, including data warehouses (e.g. Snowflake) and transformation frameworks (e.g. dbt, Dagster). - Strong communication skills and the ability to lead initiatives across product areas, collaborating closely with leadership, data science, and product teams. - Experience working in a remote-first environment and producing well-tested, reproducible work. What Sets You Apart - You’re impact-obsessed — you focus relentlessly on delivering value for users and simplify wherever possible, moving fast without sacrificing quality. - You’re entrepreneurial and relentless — you prioritize effectively, tackle hard problems with curiosity, and go above and beyond to make things happen. - You have a growth mindset and love digging into ambiguous user problems, crafting data-driven solutions, and shipping improvements quickly. - Hands-on machine learning or data science experience in production environments. 🎁 Benefits - Generous Holiday and Time off Policy - Health Insurance options including Medical, Dental, Vision - Work From Home Support - Home office setup allowance - Monthly allowance for cell phone and internet - Care benefits - Monthly allowance for wellness - Annual allowance towards Childcare - Lifetime benefit for family planning, such as adoption or fertility expenses - Retirement; 401k offering for Traditional and Roth accounts in the US (employer match up to 4% of base salary) and Pension plans internationally - Monthly allowance to dogfood the app - All Whatnauts are expected to develop a deep understanding of our product. We're passionate about building the best user experience, and all employees are expected to use Whatnot as both a buyer and a seller as part of their job (our dogfooding budget makes this fun and easy!). - Parental Leave - 16 weeks of paid parental leave + one month gradual return to work *company leave allowances run concurrently with country leave requirements which take precedence. 💛 EOEWhatnot is proud to be an Equal Opportunity Employer. We value diversity, and we do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, parental status, disability status, or any other status protected by local law. We believe that our work is better and our company culture is improved when we encourage, support, and respect the different skills and experiences represented within our workforce.

• Develop and maintain web applications using Java 20, Spring Boot 3.3, and Angular 14. • Implement asynchronous communication between microservices using Kafka, creating producers and consumers to ensure efficient message exchange. • Implement automated tests and ensure code quality using analysis tools. • Participate in code reviews, promoting development best practices. • Contribute to technical documentation for developed APIs and systems. • Implement and manage CI/CD pipelines to automate development and delivery. • Work with containers and cloud orchestration to ensure application scalability.

• Provide strategic direction on mid to long term technology development inline with SHC's enterprise goals on Performance, Privacy, Security, Availability, Maintainability and User Experience • Collaborate with business partners, vendors and developers in defining strategic and tactical solutions • Identify opportunities to improve IT service quality through automation and reduction of process defects • Implement inhouse proof of concept, facilitate technical vendor evaluations and documentation • Share knowledge with technical team and senior management of emerging technology and trends, their implications, challenges and opportunities • Partner with MyHealth, SHC Mobile, UX Design and Internal Web teams • Hands on technical role; contributes and helps set standards for all phases of the software development lifecycle, including analysis, design, implementation, automation and QA • Develops functional prototypes from wireframes and mockups, and create proper documentation • Develops websites, performs unit testing, implementation, and production application support • Participates in troubleshooting problems related to user interaction, webpage performance & mobile web optimization • Collaborates with business, functional, technology system and operational owners engineers to refine and improve the user experience • Follows industry trends with regard to front-end technologies and techniques

Role Description Buscamos un/a Fullstack Developer con sólida experiencia en Angular y Spring Boot, orientado/a a arquitecturas de microservicios y desarrollo de aplicaciones escalables, para integrarse a un equipo técnico de alto nivel en proyectos de impacto. - Desarrollar y mantener aplicaciones Fullstack utilizando Angular (frontend) y Spring Boot (backend). - Diseñar, implementar y consumir APIs REST y SOAP. - Participar activamente en el diseño y evolución de arquitecturas de microservicios. - Aplicar patrones de desarrollo y buenas prácticas orientadas a sistemas distribuidos. - Integrar soluciones con bases de datos SQL y NoSQL. - Trabajar con mensajería/eventos utilizando Kafka. - Colaborar con equipos multidisciplinarios bajo metodologías ágiles. Qualifications - Experiencia comprobable en Java. - Uso profesional de Spring Boot. - Experiencia en desarrollo frontend con Angular. - Trabajo previo en arquitecturas de microservicios. - Aplicación de patrones de diseño en entornos de microservicios. - Desarrollo y consumo de servicios REST y/o SOAP. - Manejo de bases de datos SQL y NoSQL (MongoDB y/o Redis). - Experiencia con Kafka. Requirements - Conocimientos en HTML, CSS3, TypeScript, JavaScript, Node.js, jQuery. - Experiencia con WebFlux. - Contenedores con Docker. - Experiencia en plataformas OpenShift (o Kubernetes). Benefits - Participar en proyectos tecnológicos desafiantes. - Entorno colaborativo y técnico. - Modalidad: 100% remota (Desde Chile). - Contrato a plazo fijo con posibilidad de extensión (sujeto a proyecto y desempeño). - Seguro complementario de salud (al pasar a indefinido). - Aguinaldos en fiestas patrias y navidad. - Bono anual.