Junior Software Development Engineer - Backend

Summary

Join OfferUp's backend development team and own features from conception to launch. You will build highly scalable systems for fraud detection and prevention, collaborating with cross-functional teams. Responsibilities include designing and implementing new features, analyzing attacker techniques, driving engineering excellence, and improving processes. You will develop scalable classifiers and tools using machine learning and other techniques. This role requires significant software engineering experience, data analysis skills, and proficiency in multiple programming languages. The position is available outside the US only.

Requirements

• 3+ years of professional software engineering experience, of which at least 1 was devoted to web services
• Experience performing data analysis and translating the results into business recommendations
• Strong coding skills in Java, Python, Scala, Golang or any other modern programming language coupled with strong knowledge in object-oriented design and microservices architecture
• BS or MS in Computer Science, Computer/Software Engineering, Information Systems/Technology, Information Science, or a related discipline
• Excellent communication skills, both written and spoken (fluency in English required)

Responsibilities

• Work collaboratively with cross-functional teams (risk analysts, data science, and operations) to design and implement new features
• Analyze the latest attacker techniques and apply solutions to detect them holistically and stop them proactively
• Drive engineering and operational excellence across the Trust & Safety engineering team
• Collaborate with OfferUp-wide engineering teams to improve processes, surface common pain points, develop solutions, and evangelize best practices
• Develop highly scalable classifiers and tools leveraging machine learning, data regression, and rules-based models
• Identify when to replace and when to rebuild legacy systems
• Participate in reasonable on-call rotations with the rest of the team
• Support, mentor, and help other engineers on the team

Preferred Qualifications

• Experience with Identity, authentication, and authorization systems
• Experience with anomaly detection, bot detection, machine learning, pattern recognition and/or data mining
• Experience in building microservices
• Experience with cloud infrastructure AWS