Senior Software Engineer, Backend

QXO is a leading distributor and installer of building products serving an $800 billion market. The company's mission is to modernize the building products industry through advanced technology and a best-in-class customer experience. QXO is North America's largest distributor and installer of insulation, the second-largest distributor of roofing products, the second-largest publicly traded distributor of lumber and building materials, and the largest distributor of waterproofing products. The company is targeting $50 billion in annual revenue within the decade through accretive acquisitions and organic growth. For more information, visit QXO.com.

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 [email protected] if you have any questions related to this job posting.

Salary Range:

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