Junior Software Development Engineer - Backend, Trust and Safety (@Remote, Chile and Colombia) Join to apply for the Junior Software Development Engineer - Backend, Trust and Safety (@Remote, Chile and Colombia) role at OfferUp . This role involves building scalable systems to detect and prevent fraud, working with cross-functional teams, and owning features from concept to deployment. Responsibilities include: Designing and implementing new features with risk analysts, data scientists, and operations teams. Analyzing attacker techniques and applying holistic detection solutions. Driving engineering and operational excellence within the Trust & Safety team. Collaborating across OfferUp engineering teams to improve processes and develop best practices. Developing classifiers and tools using machine learning, data regression, and rules-based models. Deciding when to replace or rebuild legacy systems. Participating in on-call rotations. Supporting and mentoring team members. Qualifications: 3+ years of software engineering experience, with at least 1 year in web services. Experience in data analysis and business recommendations. Proficiency in Java, Python, Scala, Golang, or similar languages, with knowledge of object-oriented design and microservices architecture. BSc or MSc in Computer Science, Software Engineering, or related fields. Excellent communication skills in English. Preferred but not required: Experience with identity, authentication, and authorization systems. Experience with anomaly detection, machine learning, pattern recognition, or data mining. Experience building microservices and working with AWS cloud infrastructure. About OfferUp: OfferUp is a leading local marketplace app in the US, enabling buying, selling, and connecting within communities. Founded in 2011, based in Bellevue, WA, and backed by top investors. For more, visit about.offerup.com . OfferUp is an equal opportunity employer and prohibits workplace harassment. Additional Details: Seniority level: Mid-Senior level Employment type: Full-time Job function: Engineering and IT Industries: Technology, Internet #J-18808-Ljbffr