Senior Software Developer - Web Pay from $110,000 to $148,000 per year 2200 S. Lakeside Drive, Waukegan, IL 60085 Help shape the future of Uline.com. As a Senior Software Developer, you will use your full-stack expertise to build and modernize a business-critical web platform serving thousands of customers across North America. As Uline continues to evolve this platform, you'll have the opportunity to influence architecture, solve complex engineering challenges and build reliable, high-performing solutions at enterprise scale. Provide technical leadership, mentor developers and work with teams across Uline to continually improve the customer experience. Careers Packed with Potential. Backed by 45+ years of success, Uline offers opportunities to grow your career with stability you can count on. Position Responsibilities Design, develop and modernize large-scale web applications, influencing architecture and technical direction for Uline.com. Contribute to project planning, architecture discussions and code reviews for complex initiatives from planning through delivery. Partner with teams across Uline to improve application performance and deliver solutions that enhance the customer experience. Mentor and coach developers, providing technical guidance and helping resolve engineering challenges. Explore and apply AI-powered solutions and emerging technologies, including Claude Code, GitHub Copilot, Azure AI and vector search, as part of ongoing modernization. Minimum Requirements Bachelor's degree in Computer Science, Information Technology or related field. 5+ years of software development experience, including experience developing web or eCommerce applications using .NET, Java, JavaScript or TypeScript. Experience with observability and monitoring tools such as Kibana, Elasticsearch or Dynatrace, or data integration tools such as NiFi preferred. Strong problem-solving, technical leadership and collaboration skills. Uline does not participate in the H-1B lottery. Benefits Complete health insurance coverage and 401(k) with 6% employer match that starts day one! Multiple bonus programs. Paid holidays and generous paid time off. Tuition Assistance Program that covers professional continuing education. Employee Perks Café featuring affordable daily meal options from local restaurants. On-site fitness center and beautifully maintained walking paths. Best-in-class, clean, modern facilities. About Uline Uline, a family-owned company, is North America's leading distributor of shipping, industrial, and packaging materials with over 10,000 employees across 15 locations. Uline is a drug-free workplace . All new hires must complete a pre-employment hair follicle drug screening . All positions are on-site. EEO/AA Employer/Vet/Disabled #LI-LM5 #CORP (#IN-PPITL4) #ZR-HQIT Our employees make the difference and we are committed to offering exceptional benefits and perks! Explore Uline.jobs to learn more!