E-Commerce Integration Engineer

Kforce has a client in Phoenix, AZ that is seeking an E-Commerce Integration Engineer to diagnose, troubleshoot, and optimize our live e-commerce ecosystem. This is a hands-on, problem-solving role focused on systems reliability and integration performance. Responsibilities

• Support and diagnose issues on a live e-commerce platform
• Investigate problems across: Checkout flows; Shipping rate calculations; Tax calculations; Address validation
• Trace issues from front-end, middleware, third-party APIs
• Identify whether failures stem from configuration, data, or code
• Troubleshoot REST API integrations
• Diagnose authentication issues (API keys, tokens, OAuth)
• Investigate payload/response errors, malformed requests, timeouts, and rate limits
• Analyze and interpret API logs and error messages
• Work directly with third-party vendor technical support teams
• Support and troubleshoot shipping integrations, including: Rate calculations; Service availability by location; Address validation
• Diagnose tax engine integration issues such as: Incorrect tax rates; Product tax code mismatches; Jurisdiction/address validation errors affecting tax
• Ensure proper integration within checkout workflows
• Diagnose geocoding and jurisdiction boundary issues
• Troubleshoot address normalization mismatches
• Work with GIS-based datasets
• Convert and upload files aligned with jurisdictional boundaries
• Pull and analyze logs from: Application systems; Servers; Middleware platforms
• Correlate timestamps across multiple systems
• Distinguish root cause from downstream symptoms
• Document findings and recommended fixes
• Clearly explain: What is broken; Why it is broken; Whether it is a configuration, data, integration, or code issue
• Partner with: Developers; Marketing/E-commerce teams; Operations; Third-party vendors
• Recommend preventative improvements to reduce future failures
• 5+ years supporting or engineering live e-commerce platforms
• Strong understanding of REST APIs and integration patterns
• Experience troubleshooting API authentication, payload, and timeout issues
• Experience with shipping carrier integrations
• Experience with tax engine integrations (e.g., Avalara or similar)
• Experience analyzing logs across distributed systems
• Ability to trace multi-system workflows and identify root causes
• Strong written and verbal communication skills

• Experience with enterprise e-commerce platforms
• Experience working with GIS or geolocation-based data
• Familiarity with middleware / integration platforms
• Experience working in high-transaction, revenue-sensitive environments