Senior Mobile Software Engineer - Scalable Commerce

QXO; Seattle (WA); On-site; USD 141,000 - 235,000; Full time

Benefits offered by this job

Annual bonus

Equity/stock

401(k) with employer match

Medical, dental, and vision insurance

PTO & holidays

Parental leave

Paid training and certifications

Legal assistance

Pet insurance

Employee assistance program

Job summary

QXO, a leading distributor and installer of building products, is seeking a Senior Software Engineer to design, build, and maintain the core services powering our commerce platform. You will work closely with product, design, and other engineering teams to deliver secure, reliable, and scalable solutions for millions of users across web and mobile.

This role is ideal for engineers who are passionate about building high-quality software, eager to learn, and excited to make a meaningful impact in

Qualifications

• 2–5 years of professional software engineering experience.
• Proficiency in one or more OO languages (e.g., Java, Kotlin, Go).
• Experience with front-end technologies and frameworks such as React, Next.js, or TypeScript.
• Solid understanding of data structures, algorithms, and software design principles.
• Experience developing and maintaining production systems in a cloud environment (AWS or GCP).
• Bachelor’s degree in Computer Science, Engineering, or equivalent practical experience.
• Strong collaboration and communication skills.
• Experience building commerce, checkout, or personalization systems.
• Familiarity with responsive, accessible, and high-performance UI development.
• Exposure to AI/ML systems or data-driven services.
• Experience with experimentation frameworks, recommendation systems, or search technologies.
• Knowledge of CI/CD, observability, and performance tuning tools.

Responsibilities

• Design, develop, and maintain eCommerce services and user interfaces.
• Implement scalable, low-latency systems that meet performance and security goals.
• Build intuitive and performant front-end experiences.
• Collaborate with cross-functional teams to deliver end-to-end product features.
• Write clean, efficient, and testable code.
• Participate in design and code reviews.
• Support the continuous improvement of system reliability and operational excellence.
• Contribute to shared libraries, platform components, and design systems.

Skills

Java

Kotlin

Go

React

Next.js

TypeScript

AWS

GCP

Data structures & algorithms

Cloud experience

Software design principles

Education

Bachelor's degree in Computer Science or Engineering

Tools

CI/CD tools

Observability tools

Performance tuning tools

Job description

QXO, a leading distributor and installer of building products, is seeking a Senior Software Engineer to design, build, and maintain the core services powering our commerce platform. You will work closely with product, design, and other engineering teams to deliver secure, reliable, and scalable solutions for millions of users across web and mobile.

This role is ideal for engineers who are passionate about building high-quality software, eager to learn, and excited to make a meaningful impact in