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
Job Title: Senior Software Engineer I, Backend
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.

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