Hybrid Senior Software Development Engineer – Core Team

at OfferUp

• Job title: Senior Software Development Engineer – Core Team
• Job type: Full Time
• Experience level: Senior
• Salary: $180,000 - $205,000 per year
• Degree requirement: Bachelor's Degree
• Tech skills: Android, AWS, Cloud, iOS, Java, Kotlin, Microservices, Objective-C, Python, React, React Native, Scala, Swift, Go
• Location requirements: Hybrid, Bellevue, United States

About the role

• Senior Backend Engineer developing systems for detecting fraud and ensuring app stability at OfferUp. Collaborating with cross-functional teams to enhance engineering excellence and mentor junior engineers.

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 Core engineering team
• Collaborate with OfferUp-wide engineering teams to improve processes, surface common pain points, develop solutions, and evangelize best practices
• 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
• Develop highly scalable classifiers and tools leveraging machine learning, data regression, and rules-based models
• Ensure app stability by identifying and resolving crashes, freezes, and network errors across both React Native and native layers
• Develop reusable tools and frameworks to streamline development and improve the developer experience
• Mentor and guide junior engineers, fostering best practices for frontend and native development.

Requirements

• 5+ years of professional software engineering experience, of which at least 3 were devoted to web services
• 2+ years of experience in real-time messaging systems
• Experience performing data analysis and translating the results into business recommendations
• Experience in working with data-driven applications at scale
• 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
• Proficiency in native development languages: Swift/Objective-C (iOS) and Kotlin/Java (Android) (helpful but not required)
• Experience with Agile development methodologies (helpful but not required)
• Experience with load balancing and handling massive data traffic (helpful but not required)
• Experience writing code in Python and Java (helpful but not required)
• Experience with cloud infrastructure AWS (helpful but not required).