Senior Software Engineer, Backend

QXO; Seattle (WA); On-site; USD 138,000 - 235,000; Full time

Benefits offered by this job

Annual performance bonus

Long-term incentive (equity/stock)

401(k) with employer match

Medical, dental, and vision insurance

Paid Time Off/Paid Sick Leave

Paid training and certifications

Employee assistance program (EAP)

Job summary

A leading building products distribution company is seeking a Senior Software Engineer to lead the design and development of eCommerce services. This role involves building scalable systems and collaborating with cross-functional teams to enhance customer experiences. Candidates should have over 5 years of coding experience, strong knowledge of data structures, and expertise in modern front-end technologies. The offered salary ranges from $138,000 to $235,000 annually, along with competitive benefits including bonuses and stock options.

Qualifications

• 5+ years of hands-on coding experience.
• 3+ years building scalable, distributed systems.
• Experience with modern front-end technologies and frameworks.

Responsibilities

• Design, build, and operate eCommerce services.
• Collaborate with cross-functional teams.
• Mentor junior engineers.

Skills

Hands-on coding experience

Building scalable, distributed systems

Modern front-end technologies

Strong knowledge of data structures

Production systems in cloud-native environment

Mentoring other engineers

Education

Bachelor’s degree in computer science or engineering

Job description

We’re looking for bold, entrepreneurial talent ready to help build something extraordinary — and reshape the future of building products distribution.

QXO is a publicly traded company founded by Brad Jacobs with the goal of building the market‑leading company in the building products distribution industry. On April 30, 2025, QXO completed its first acquisition: Beacon Building Products, a leading distributor in the sector.

We are building a customer‑focused, tech‑enabled, and innovation‑driven business that will scale rapidly through accretive M&A, organic growth, and greenfield expansion. Our strategy is rooted in delivering exceptional customer experiences, improving operational efficiency, and leveraging data, digital tools, and AI to modernize a historically under‑digitized industry.

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.

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)

Salary Range

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

QXO is an Equal Opportunity Employer. We value diversity and do not discriminate on the basis of race, color, religion, sex, 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 [e-mail] if you have any questions related to this job posting.