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

CWILL; New Jersey; On-site; USD 60,000 - 80,000; Full time

Benefits offered by this job

401(k)

PTO

Paid Holidays

Insurance

Job summary

CWILL, a post‑purchase and retention SaaS for Shopify brands, is launching an R&D Management Trainee program in New Jersey. You’ll join a product engineering team, work on production systems from day one with mentorship from senior engineers, and grow into an engineer who can independently own modules and make technical decisions.

Placed on an active product team—Order Tracking, Loyalty & Referrals, Pop-up & Email Marketing, AI Chat, SEO & Speed—you’ll contribute to feature development, system

Qualifications

• Recent US university graduate (BS or MS) or within 1–2 years of graduation.
• Proficiency in at least one backend language: JavaScript/TypeScript, Python, Java, Go, or PHP.
• Web fundamentals: HTTP, RESTful API design, frontend-backend interaction, and relational databases.
• Basic SQL and database understanding (MySQL or PostgreSQL).
• Able to read documentation, debug systematically, and own your work through completion.
• Reliable and communicative — you surface problems early and follow through.

Responsibilities

• Build features across the full stack with a backend focus: APIs, business logic, data processing, and third‑party integrations.
• Participate in technical solution design, coding, integration testing, and deployment.
• Take ownership of the quality of the features you build and deliver them to spec.
• Assist with production bug investigation, root cause analysis, and resolution.
• Follow team engineering standards: code reviews, documentation, and testing; communicate progress and risks.

Skills

Backend languages

Web fundamentals

Debugging

Communication

Problem solving

Education

BS or MS

Tools

React

Node.js

Next.js

NestJS

PostgreSQL

Redis

Docker

CI/CD

AWS

Job description

About CWILL

CWILL (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 CWILL

CWILL (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 Role

CWILL'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 Tracking
• Loyalty & Referrals
• Pop-up & Email Marketing
• AI Chat
• SEO & Speed

What You’ll Do

Product Feature Development

• Build features across the full stack with a backend focus: APIs, business logic, data processing, and third-party integrations
• Participate in technical solution design, coding, integration testing, and deployment
• Take ownership of the quality of the features you build and deliver them to spec

System Maintenance & Bug Fixes

• Assist with production bug investigation, root cause analysis, and resolution
• Use logging, monitoring, and database tools to trace issues methodically
• Contribute to ongoing improvements in system stability, performance, and code maintainability

Engineering Collaboration & Growth

• Follow team engineering standards: code reviews, documentation, and testing
• Proactively communicate progress, risks, and blockers
• Participate in post-launch retrospectives; continuously improve your code quality and engineering judgment
• As you grow, take on increasing ownership of modules and technical decisions

Requirements

• Recent graduate from a US university (BS or MS), or within 1-2 years of graduation
• Proficiency in at least one backend language: JavaScript/TypeScript, Python, Java, Go, or PHP
• Web fundamentals: HTTP, RESTful API design, frontend-backend interaction, and relational databases
• Basic SQL and database understanding (MySQL or PostgreSQL)
• Able to read documentation, debug systematically, and own your work through completion
• Reliable and communicative — you surface problems early and follow through on commitments

Nice to Have

• Experience with any of: React, Node.js, Next.js, NestJS, Python, PostgreSQL, Redis
• AI/LLM project experience: prompt engineering, RAG, knowledge bases, chatbots, or content generation
• Shopify app development, independent store tech, SEO tools, or SaaS product experience
• Internship at a tech or SaaS company; open source contributions or personal project portfolio
• Familiarity with Docker, CI/CD, or cloud services (AWS, Aliyun, etc.)
• Active GitHub profile with consistent commit history
• Competitive programming background (ACM, LanQiao Cup, etc.)
• Experience with AI-assisted development tools (Cursor, GitHub Copilot, Claude Code, etc.)
• Mandarin Chinese communication ability

Benefits

Starting Pay: 60 - 80k depends on experiences, open to negotiation

• 401(k)
• PTO
• Paid Holidays
• Insurance