Sr. Back End Developer

• Design, build, and maintain backend services that support marketplace shopping experiences and related platform capabilities
• Contribute to system architecture and technical design discussions for scalable, production-grade solutions
• Develop services that support product discovery, catalog management, hierarchy management, ranking, and fulfillment functionality
• Work across the full delivery lifecycle, from solution design through implementation and deployment
• Collaborate with team members to solve complex technical challenges in a fast-moving environment
• Help ensure services are reliable, efficient, and built to support high-scale usage
• Participate in ongoing improvements to performance, maintainability, and operational stability

• 10 to 15 years of professional Java development experience
• Strong experience with Spring Boot and microservices architecture
• Deep understanding of system design and distributed systems
• Hands-on experience with Kafka and event-driven architecture
• Strong working knowledge of PostgreSQL or other relational databases
• Ability to independently design and deliver complex backend solutions
• Clear communication skills and a collaborative, solution-oriented mindset
• Experience working in production environments with scalable systems

Preferred Skills

• Experience in marketplace, e-commerce, or retail environments
• Familiarity with Spring Cache
• Experience with Google Cloud Platform and BigQuery
• Background in performance tuning and optimization
• Experience owning large-scale production systems end to end
• Comfort working in environments with ambiguity and evolving requirements

Horizontal is committed to fostering a diverse, equitable, and inclusive workplace where everyone feels valued, respected, and empowered to contribute. We welcome candidates from all backgrounds and encourage applicants who are excited to bring their unique perspectives and experience to the team.