Senior Software Engineer I, Cloud Platform

Confidence can sometimes hold us back from applying for a job. Here's a secret: there's no such thing as a "perfect" candidate. Poshmark is looking for exceptional people who want to make a positive impact through their work and help create an organization where everyone can thrive. So whatever background you bring with you, please apply if this role would make you excited to come to work every day. Job Description: Poshmark is a leading social marketplace for new and secondhand style for women, men, kids, pets, home, and more. By combining the human connection of physical shopping with the scale, ease, and selection benefits of e-commerce, Poshmark makes buying and selling simple, social, and sustainable. We are seeking an experienced Senior Software Engineer I to join our Core Platform team and contribute to the continued scalability and innovation of our backend systems. As a key technical contributor, you will play a critical role in building and optimizing the cloud-native infrastructure and services that power our high-traffic marketplace. The Poshmark community creates a new listing every 2 seconds and generates millions of likes, comments, and shares every single day — this is your opportunity to impact the core of that experience. Responsibilities: Lead the design, development, and deployment of scalable backend services and distributed systems. Help evolve our application and service delivery platform, leveraging cloud-native architectures, NoSQL solutions, queueing technologies, and search infrastructure. Architect and implement new product features using a data-driven, iterative approach with measurable impact. Drive performance tuning and system improvements to ensure reliability, scalability, and maintainability of key components. Collaborate with cross-functional teams — including Product, Design, DevOps, and QA — to deliver high-quality software aligned with business goals. Actively participate in code reviews, technical discussions, and mentoring of junior engineers. Identify and lead refactoring and technical debt reduction efforts to improve developer velocity and system health. 6-Month Accomplishments: Ramp up quickly on Poshmark's codebase, cloud architecture, and development workflows. Take ownership of key components or services and contribute high-quality, well-tested code to production. Serve as a go-to technical resource within your immediate team. Drive cross-team collaboration to deliver features and improvements efficiently and effectively. 12+ Month Accomplishments: Lead the technical execution of complex initiatives with multiple dependencies and stakeholders. Influence architectural decisions and contribute to long-term platform and service strategy. Drive engineering excellence through best practices, tooling, and process improvements. Provide mentorship and technical leadership across the backend engineering team. Requirements: 4+ years of professional backend software engineering experience, including designing and scaling distributed systems. Strong foundation in computer science, including data structures, algorithms, and software design principles. Proficiency with backend programming languages such as Ruby and/or Java. Experience working with technologies like MongoDB, ElasticSearch, RabbitMQ, and Redis. Strong understanding of RESTful API design and implementation. Experience with scalability, performance optimization, and systems-level problem solving. Familiarity with microservices architecture and cloud platforms (e.g., AWS, GCP) is a plus. Bachelor's or Master's degree in Computer Science or a related field. Strong communication skills and a user-centric, quality-first mindset. Poshmark is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. View Poshmark's Job Applicant Privacy Policy here. Welcome to Poshmark Careers! Poshmark is a leading fashion resale marketplace powered by a vibrant, highly engaged community of buyers and sellers and real-time social experiences. Designed to make online selling fun, more social and easier than ever, Poshmark empowers its sellers to turn their closet into a thriving business and share their style with the world. Since its founding in 2011, Poshmark has grown its community to over 130 million users and generated over $10 billion in GMV, helping sellers realize billions in earnings, delighting buyers with deals and one-of-a-kind items, and building a more sustainable future for fashion. For more information, please visit www.poshmark.com, and for company news, visit newsroom.poshmark.com. Why Poshmark? At Poshmark, we're constantly challenging the status quo and are looking for innovative and passionate people to help shape the future of Poshmark. We're disrupting the industry by combining social connections with e-commerce through data-driven solutions and the latest technology to optimize our platform. We're nothing without our amazing team who deliver an unparalleled social shopping experience to the millions of people we connect each day. We built Poshmark around four core values: 1) focus on people to create empowered communities that drive success; 2) together we grow to support each other to strive for our dreams; 3) lead with love to foster genuine connections built upon a foundation of respect; and 4) embrace your weirdness to accept and empower one another on their own unique journey. We're invested in our team and community, working together to build an entirely new way to shop. That way, when we win, we all win together. Come help us build the most connected shopping experience ever. We will set you up with comprehensive global and in-country benefits to support you and your family needs.