Senior Machine Learning Engineer

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
Senior Machine Learning Engineer
Poshmark is a leading social marketplace for new and secondhand styles for women, men, kids, home, and more. By combining the human connection of physical shopping with the scale, ease, and selection benefits of ecommerce, Poshmark makes buying and selling simple, social, and fun.
The Machine Learning team is a central player in the Poshmark organization. Our mission is to build a world-class machine learning platform to bring value out of data for us and for our customers. Our goal is to democratize data science and machine learning, support exploding business, and use machine learning to drive value across the chain (Search, personalization, fraud detection, catalog digitisation to name a few)
Responsibilities

• Manage the entire ML lifecycle from data collection to deployment and monitoring
• Collaborate across teams such as DS, QA, Infra and other engineering teams to productionize ML models
• Write and optimize code for production environments, ensuring the robustness and reliability of ML services at scale
• Manage and support current solutions while evolving them to incorporate newer technologies
• Strong written, verbal, and presentation skills, with the ability to convey complex concepts in a clear and simple manner
• Stay updated with the latest developments in data science and machine learning

Desired Skills & Experience

• 4+ years of experience applying Machine Learning to concrete problems at large scale
• Bachelors or Masters in Computer Science, Statistics, or related field
• Strong CS fundamentals. Should be able to write algorithms with ease.
• Solid understanding of Data Science and ML fundamentals – Regression, Classification, Tree-based approach, Neural network, and sequence-based models.
• Working experience with at least one ML model: LLMs, GNN, Deep Learning, Logistic Regression, Gradient Boosting trees, etc.
• Should have excellent understanding of ML lifecycle
• Good understanding of system architecture. Have knowledge of big data technologies – streaming architecture, data pipelines, etc.
• Experience with Python, SQL, Java or Scala

• Good to have:

• Big data systems – Spark, EMR, S3, AirFlow

• Production experience with LLMs and prompt engineering
• Experience with Flask, FastAPI, RabbitMQ, Embeddings and Vector DBs

About Us
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 , and for company news, visit

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.

Poshmark is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.

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