Order Tracking Rd Trainee Backend Engineer

About CWILL

CWILL (pronounced "quill") is a post-purchase and retention suite trusted by 30,000+ Shopify and DTC brands. Our products cover order tracking, returns and exchanges, shipping protection, loyalty and referrals, product reviews, pop-up and email marketing, AI chat and SEO ( helps Shopify merchants keep shoppers informed after checkout, with branded tracking pages, real-time shipment updates and delivery notifications. As an R&D Trainee, you'll work on backend development for our Shopify apps and grow into an engineer who can independently own feature modules. Our core PHP/Swoole projects are under active development, and Go is our long-term direction.

Tech stack: Go, PHP/Swoole, MySQL 8.x, Redis, RabbitMQ, AWS.

Location: Cary, NC (hybrid). We are unable to hire in other states; relocation is required.

What You'll Do

• Build features, integrate APIs and fix issues in our Go and PHP/Swoole projects.
• With guidance from senior engineers, read code, investigate logs, write tests, take part in code reviews and deliver tasks on schedule.
• Work with product, QA and engineering to clarify requirements, share progress and raise issues, and write technical notes where needed.

Requirements

• Programming fundamentals: solid grasp of at least one backend language; able to build a small feature and explain how it works. Go or PHP preferred, but you don't need to know both. Coursework, personal projects and internships all count.
• Backend fundamentals: understand the basics of HTTP, APIs, JSON, databases, caching and message queues; able to write basic SQL, use Git and track down problems from logs.
• Learning and collaboration: you read documentation, test things hands-on and ask specific questions; you share progress and blockers proactively, and take code review feedback on board.
• Language: able to clarify requirements, discuss technical topics and write progress updates in Mandarin Chinese with our China-based engineering team; able to read English technical documentation and error messages (tools are fine).
• AI tools: willing to use company-provided Codex and Claude Code in your work; able to understand, review and test the code you submit, and follow our data security rules. No prior experience with specific AI tools required.

Nice to Have

• Project experience with Go, PHP/Swoole, Shopify apps or third-party API integrations.
• Experience with MySQL 8.x, Redis or RabbitMQ, or exposure to AWS, Linux or Docker. Production operations and performance tuning experience is not required.

Benefits

• Starting pay: $80K–$110K depending on experience, open to negotiation
• 401(k)
• PTO
• Paid holidays
• Insurance
• Mentorship and a clear growth path from trainee to engineer