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Senior Software Engineer, Fullstack

POSH - New York, NY, USA - In-office - posted 2026-09-15

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ABOUT POSH Posh is a platform enabling anyone to build in-real-life (IRL) communities based on shared interests. Founded by event organizers frustrated with the loneliness epidemic and inadequate tools, Posh has grown to 70 team members, 10M+ users, $70M in venture funding, and facilitated over $400M in transactions in 6 years. The platform helps event organizers launch, monetize, and brand their communities while connecting consumers with like-minded people. ABOUT THE ROLE As a Senior Software Engineer, Fullstack, you will help shape the platform that brings people together through live events. Your work will directly impact how event organizers create experiences and how attendees discover and enjoy them. You'll tackle exciting projects that push the platform forward. Recent work includes building a system for users to follow each other, creating curated event playlists, and tools for affiliate event promotion. You'll work in a fast-paced environment solving real-world problems at scale. KEY RESPONSIBILITIES: - Lead the architecture design and implementation of complex features - Demonstrate full stack experience with specialization in either frontend, backend, or infrastructure while contributing to broader projects - Collaborate on architecture and technical decisions that influence the direction of the platform, ensuring scalability, performance, and user-focused improvements - Focus on performance optimization and system reliability as the user base grows - Build with data and analytics in mind to provide actionable insights for business leaders and event organizers - Drive experimentation with MVPs, balancing rapid iteration with long-term sustainable growth and developer experience - Contribute to frontend design systems, database design, or DevOps/infrastructure to ensure scalable, secure, and maintainable systems - Provide mentorship to engineers, fostering a culture of growth and collaboration WORKPLACE: This is an in-person position at the New York City office located in SoHo. REQUIREMENTS: - 5+ years of experience leading complex technical projects with significant business impact - Strong expertise in a specific area (frontend, backend, or infrastructure) while maintaining broad knowledge of the full stack - Proficiency in relevant technologies such as React, React Native, TypeScript, AWS or similar cloud providers, with experience in either mobile app development or backend systems - Experience with scalability, performance optimization, and building tools that support data-driven decision-making - Strong problem-solving skills and passion for creating products that connect people in the real world - Ability to lead initiatives, mentor others, and communicate effectively across technical and non-technical teams - Experience working at consumer, social, or marketplace companies is a plus - Please include links to your GitHub profile or a portfolio of past projects when applying

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