Bilingual Mandarin R&D Trainee - Full-Stack Engineer (Backend）

About CWILLCWILL (pronounced 'quill') is a post-purchase and retention suite built for Shopify brands. Reduce support tickets, recover lost revenue from returns, and turn one-time buyers into loyal fans — with tools purpose-built for every touchpoint that follows the sale.About The RoleCWILL's engineering teams are building the next generation of SaaS products for Shopify brands — including AI-powered customer service tools and SEO optimization products. As our products grow, so does our need for strong engineering talent who can learn fast and ship real things.Our R&D Management Trainee program is built for engineers who are new to the workforce but ready to dig in. You'll be embedded in a product engineering team, working on production systems from day one with mentorship from senior engineers. Over time, you'll grow into an engineer who can independently own modules and make technical decisions.You'll be placed on one of our active product teams:Order TrackingLoyalty & ReferralsPop-up & Email MarketingAI ChatSEO & SpeedWhat You'll DoCustomer Issue SupportInvestigate and resolve technical issues raised through user and customer-support tickets, quickly identifying the root cause of front-end and back-end failures (data discrepancies, API errors, display issues, and similar)Triage and prioritize incoming issues by severity; respond promptly to urgent cases, drive them through to a fix, and close the loop with the reporting teamDocument recurring issues — producing troubleshooting guides and FAQs — to reduce repeat tickets over timeWork with the customer support and product teams to reproduce reported problems, and provide data corrections or interim workarounds where neededSystem Maintenance & Bug FixesAssist with production bug investigation, root cause analysis, and resolutionUse logging, monitoring, and database tools to trace issues methodicallyContribute to ongoing improvements in system stability, performance, and code maintainabilityEngineering Collaboration & GrowthFollow team engineering standards: code reviews, documentation, and testingProactively communicate progress, risks, and blockersParticipate in post-launch retrospectives; continuously improve your code quality and engineering judgmentAs you grow, take on increasing ownership of modules and technical decisionsRequirementsRecent graduate from a US university (BS or MS), or within 1-2 years of graduationProficiency in at least one backend language: JavaScript/TypeScript, Python, Java, Go, or PHPWeb fundamentals: HTTP, RESTful API design, frontend-backend interaction, and relational databasesBasic SQL and database understanding (MySQL or PostgreSQL)Able to read documentation, debug systematically, and own your work through completionReliable and communicative — you surface problems early and follow through on commitmentsNice to HaveExperience with any of: React, Node.js, Next.js, NestJS, Python, PostgreSQL, RedisAI/LLM project experience: prompt engineering, RAG, knowledge bases, chatbots, or content generationShopify app development, independent store tech, SEO tools, or SaaS product experienceInternship at a tech or SaaS company; open source contributions or personal project portfolioFamiliarity with Docker, CI/CD, or cloud services (AWS, Aliyun, etc.)Active GitHub profile with consistent commit historyCompetitive programming background (ACM, LanQiao Cup, etc.)Experience with AI-assisted development tools (Cursor, GitHub Copilot, Claude Code, etc.)Mandarin Chinese communication abilityBenefitsStarting Pay: 60 - 80k depends on experiences, open to negotiation401(k)PTO Paid HolidaysInsurance