Junior Software Development Engineer - Full Stack (Advertising)

Employment Type: [Not Specified] Location Type: Outside the US (Not available to individuals based within the US or any US territory) Salary: [Not Specified]

Position Overview

As a Junior Software Development Engineer - Full Stack on the Advertising team, you will help build and maintain backend services and APIs that support our advertising platform. While your primary focus will be backend development, you will also work across the full stack when needed—touching front-end components and collaborating with cross-functional teams to deliver features end to end. You’ll write clean, maintainable, and well-tested code, contribute to technical decisions, and support product rollouts with an eye on operational excellence and metrics.

Responsibilities

• Design, develop, and deploy scalable backend services and APIs that power advertising experiences on OfferUp.
• Collaborate with product managers, business analysts, and peer engineers to design, implement and deliver new features.
• Contribute to front-end development (e.g., React Native) as needed—frontend experience is a plus, but not required.
• Maintain and improve existing codebases across backend and frontend systems.
• Participate in code reviews and contribute to technical design discussions.
• Help ensure high quality and operational excellence through testing, monitoring, and debugging.

Requirements

• 2+ years of professional software engineering experience.
• Proficiency in one or more backend languages, such as Java.
• Solid understanding of data structures, object-oriented design, and scalable system design.
• Experience working with cloud platforms such as AWS.
• Willingness to work on front-end codebases when needed.
• Strong written and verbal communication skills (fluency in English required).
• A collaborative mindset and eagerness to learn in a fast-paced environment.
• BS or MS in Computer Science or equivalent practical experience.

Preferred Qualifications (Helpful, but not required)

• Exposure to or interest in React, React Native, or other modern frontend frameworks.
• Experience with mobile app development.
• Familiarity with Apollo GraphQL and RESTful API design.
• Understanding of Agile development practices.
• A Github repo showcasing your code.

About OfferUp

OfferUp is dedicated to creating the simplest and most trusted way for people to buy, sell, and connect in their local communities. One of the top local marketplace apps for local buyers and sellers in the U.S., OfferUp makes it easy for people to discover more of what they need—from great deals and secondhand goods to jobs, services, home rentals, and more—right in their own communities. Our trusted platform empowers millions to connect, thrive, and move life forward.

Available on iOS and Android, OfferUp has consistently ranked among the top shopping apps. Founded in 2011 and based in Bellevue, WA, OfferUp serves local markets nationwide and was used by more than 1 in 6 adults in the U.S. in 2024. OfferUp is backed by leading investors, including Andreessen Horowitz, Warburg Pincus, GGV Capital, T. Rowe Price, and Coatue Management.

OfferUp At a Glance

• Top 10 Shopping app in the App Store and Google Play Store for three years.
• 15%+ of adults in several major markets use OfferUp every month (LA, Miami, Phoenix, Seattle, Las Vegas, Riverside, Orlando).
• OfferUp works directly with nearly 2000 US law enforcement agencies to build trust in local communities.

OfferUp is unleashing the power of local, and we’ve built a dynamic team to do it. To learn more about working at OfferUp, check out https://about.offerup.com/people.

Company Information

OfferUp provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, sex, national origin, age, disability, or genetics. In addition to federal law requirements, OfferUp complies with applicable state and local laws governing nondiscrimination in employment in every location.

Application Instructions

[Not Specified]