Senior Backend Engineer: Scalable Systems Leader

Poshmark; California (MO); On-site; USD 140,000 - 180,000; Full time

Job summary

Poshmark is seeking a Senior Software Engineer II to join our Core Platform team and own complex backend features from design through production. You will build reliable, scalable services that power our marketplace.

You will mentor junior engineers, contribute to architectural discussions, improve observability, and collaborate with Product, QA, Infrastructure, and other teams to deliver high‑quality, resilient systems.

Qualifications

• Bachelor’s or Master’s degree in Computer Science, Engineering, or related field.
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Responsibilities

• Design, develop, test, deploy, and operate scalable backend services that support Poshmark’s marketplace.
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Skills

Backend development

Distributed systems

APIs design

Ruby / JRuby / Java

Testing & quality

Education

Bachelor’s or Master’s degree in Computer Science

Tools

MongoDB

Elasticsearch

RabbitMQ

Linux

AWS

Job description

Poshmark is seeking a Senior Software Engineer II to join our Core Platform team and own complex backend features from design through production. You will build reliable, scalable services that power our marketplace.

You will mentor junior engineers, contribute to architectural discussions, improve observability, and collaborate with Product, QA, Infrastructure, and other teams to deliver high‑quality, resilient systems.