Senior Software Engineer, Backend

QXO is North America's largest distributor and installer of insulation; second-largest distributor of roofing products; second-largest publicly traded distributor of lumber and building materials; and largest distributor of waterproofing products. QXO is the fastest growing company in the $800 billion building products distribution industry and plans to become the tech-enabled leader by delivering best-in-class customer satisfaction and outsized returns for its shareholders. The company is targeting $50 billion in annual revenue within the next decade through accretive acquisitions and organic growth. Visit QXO.com for more information.


What you'll do:

As a Senior Software Engineer on the QXO eCommerce team, you will lead the design, development, and operation of foundational commerce services. You will own complex systems from ideation through launch and drive long-term architectural evolution. You'll collaborate across engineering, product, and design teams to build secure, reliable, and extensible services and user interfaces that serve millions of users across web and mobile platforms.

This role is ideal for engineers who are highly technical, customer-obsessed, and comfortable working in fast-paced environments with high ambiguity and high ownership.

Key Responsibilities

• Design, build, and operate eCommerce services
• Design and implement scalable, low-latency systems that meet performance and security requirements
• Build intuitive and performant user interfaces
• Contribute to shared design system and front-end architecture
• Collaborate with cross-functional teams to develop end-to-end solutions
• Write clean, efficient, and testable code
• Contribute to shared libraries and platform components.
• Lead design, architecture and code reviews.
• Continuously improve operational excellence and system reliability
• Mentor junior engineers and shape engineering best practices.

What you'll bring:

Qualifications & Skills

• 5+ years of hands-on coding experience
• 3+ years building scalable, distributed systems using object-oriented programming languages (Java, Kotlin, Go, etc.)
• Experience with modern front-end technologies and frameworks such as React, Next.js, or TypeScript
• Strong knowledge of data structures, algorithms, system design, and concurrency
• Experience building and developing large-scale reliable distributed systems.
• Experience designing, launching, and maintaining production systems in a cloud-native environment (e.g., GCP, AWS)
• Experience leading architectural designs and mentoring other engineers
• Bachelor's degree in computer science, engineering, or equivalent
• Strong verbal and written communication skills

Preferred Qualifications:

• Experience building commerce, checkout, identity, or personalization services at scale
• Experience building responsive, accessible, and performant UIs using front-end or mobile frameworks such as React Native
• Familiarity with AI/ML systems, including model inference pipelines, data labeling infrastructure, or real-time decisioning
• Experience with experimentation frameworks, recommendation engines, or search platforms
• Experience working with CI/CD pipelines, observability tools, and performance tuning
• Experience in Marketing or Ad Tech
• MS or Ph.D.

What you'll earn

• Base pay range: $138,000 - $235,000
• Annual performance bonus
• Long term incentive (equity/stock)
• 401(k) with employer match
• Medical, dental, and vision insurance
• PTO, company holidays, and parental leave
• Paid Time Off/Paid Sick Leave: Applicants can expect to accrue 15 days of paid time off during their first year (4.62 hours for every 80 hours worked) and increased accruals after five years of service.
• Paid training and certifications
• Legal assistance and identity protection
• Pet insurance
• Employee assistance program (EAP)

QXO is an Equal Opportunity Employer. We value diversity and do not discriminate on the basis of race, color, religion, gender or sexual orientation, national origin, age, disability, or any other protected status.


To comply with Pay Transparency laws, employers must disclose an annual salary range. Actual offers depend on factors such as location, experience, skills, and market data. This position may also offer variable compensation.

Please contact View email address on click.appcast.io if you have any questions related to this job posting.

Salary Range:

USD $138,000.00 - USD $235,000.00 /Yr.