About the role:

The OfferUp Business team owns the platforms that power every business vertical on our marketplace; Storefronts, Auto Dealers, Services, Rentals, and Jobs. Our customers aren't casually browsing; they're running businesses on top of what we build, so every feature we ship has a direct, measurable impact on their livelihood and on OfferUp's revenue. We operate the full stack end-to-end: including microservices that handle some of the highest RPS and TPS in the company, and integrations with partners like Stripe and Shopify. We move fast, instrument everything, and treat experimentation as a first-class part of the workflow. We've barely scratched the surface of what these verticals can become, and the roadmap is wide open for someone who wants to help shape it.

At many organizations, your role begins and ends with the code. On our team, we’re different. You own a feature from concept to fruition. Your responsibilities will include everything from writing well architected and thoroughly tested code, to rolling out the feature by analyzing metrics. You also get to take ownership beyond your technical area by working with cross-functional team members.

As a Full Stack Software Engineer II on the Business team, you'll be a proven contributor who ships features end-to-end across the stack. From the React components our business customers interact with, to the Java services and data pipelines behind them. You'll take real ownership of the work you deliver, raise the quality of the code around you, and grow into a high-performing, reliable contributor on the team.

Here’s more of what you will get to do:

• Design, build, and deploy new user experiences and backend services across our five business verticals, using React, TypeScript, GraphQL, Node.js, and Java
• Own features end-to-end: plan, design, develop, deploy, measure, and iterate
• Break down complex engineering problems into achievable tasks and deliver them within committed timeframes
• Work collaboratively with cross-functional teams (Product, Design, Data, Business stakeholders) to design and implement new features
• Contribute to A/B tests and use experimentation results to decide what ships
• Actively participate in code reviews and enforce good patterns, testing, and edge-case handling
• Coach and mentor junior team members, new hires, and interns
• Create shared components, utilities, and services that improve team velocity across the stack
• Maintain and improve the runbooks, alerting, and monitoring for the features you ship
• Participate in a reasonable on-call rotation with the rest of the team
• Use AI coding tools (Claude Code, Cursor, Copilot, and similar) to increase your daily development velocity and code quality
• Become a subject matter expert in one or more of the team's sub-domains

You’ll thrive in this role if you have:

• 2+ years of professional software engineering experience
• Demonstrated ability to own the delivery of multiple features end-to-end (plan, design, develop, and deploy) with high efficiency, including breaking down engineering problems into achievable tasks
• Strong coding skills across the full stack:
• React, TypeScript, HTML, CSS, and modern web tooling; good grasp of responsive design, performance, and cross-browser compatibility
• Java and a working understanding of microservices and distributed-systems fundamentals
• Experience building and integrating with REST or GraphQL APIs
• Good knowledge of data structures and object-oriented design
• Hands-on experience using AI coding tools (Claude Code, Cursor, Copilot, or similar) in a real engineering workflow, and a point of view on when they help and when they don't
• Follows good coding patterns, writes appropriate tests, considers trade-offs, and actively seeks out edge cases
• Comfortable giving and receiving feedback in code reviews
• A bias toward shipping, learning from production, and iterating quickly
• An insatiable desire and ability to learn
• BS or MS in Computer Science, or equivalent practical experience

Helpful, but not required:

• Fluency in any other modern OOO programming language
• Experience with Agile development
• Experience with AWS Cloud infrastructure
• Experience around any of the following: web package managers, Bower, bundler system, NodeJS, Python, webpack
• Experience with A/B testing platforms (Statsig, LaunchDarkly, Optimizely) and analytics warehouses (BigQuery, Snowflake)
• Experience consuming or integrating LLM-based APIs (e.g., Bedrock, Vertex AI, OpenAI)
• Familiarity with AWS cloud infrastructure and CI/CD pipelines