Senior Software Development Engineer I
About The Position
SHEIN Technology is seeking a Senior Software Engineer in Forward Deployed Engineering to join its U.S. Augmented Intelligence Team. The role owns production AI systems that help U.S. Marketplace sellers onboard and list products at scale. These systems convert varied seller data—including spreadsheets, ERP exports, and storefront catalogs—into publish-ready listings through AI-driven category, attribute, and brand mapping, automated verification, and human review. The position also owns AI automation supporting U.S. business functions such as people operations and accounting. The role combines applied large-language-model engineering with production backend development and integrations. It includes building evaluation benchmarks and harnesses from real seller data, analyzing failures to improve plans, prompts, and mapping logic, and guarding against overfitting so improvements generalize to unseen data. The engineer is also a technical point of contact for SHEIN Open Platform partners, supporting API integration, acceptance testing, and launches. The engineer works with U.S. Marketplace and corporate-function stakeholders, external integration partners, and engineering counterparts in China. Requirements may emerge through seller files and partner questions rather than formal specifications, and the role is expected to take work from discovery through production and adoption. The stated job location is San Diego, California; the role reports to the Engineering Manager, U.S. Augmented Intelligence Team.
Requirements
- Master's degree in Computer Science, Artificial Intelligence, or a related field, or equivalent practical experience.
- At least 3 years of professional software engineering experience, including shipping LLM-powered applications to production.
- Proven experience building and evaluating production agentic systems on LLMs, including multi-step tool use, structured output, multi-agent orchestration, and designing for non-deterministic behavior.
- Ability to build evaluation datasets from real business data, separate training and blind holdout sets, and detect regressions when models, prompts, or data change.
- Proficiency in Java and Python, with hands-on experience building backend services using Spring Boot and MyBatis.
- Working knowledge of TypeScript/JavaScript, React, and Next.js for web front ends and browser extensions.
- Backend, database, and integration skills, including REST APIs and webhooks, relational databases such as MySQL, Redis caching, message queues such as Kafka, containerized deployment, high-volume data processing, and integrations with external partners and internal business systems through APIs.
- Proficiency with an AI-powered coding tool such as Claude Code, Codex CLI, GitHub Copilot, or Cursor, and ability to design structured, repeatable AI-assisted development workflows.
- Ability to turn ambiguous business needs and messy real-world data into reliable solutions and clearly explain model behavior and limitations to non-engineering stakeholders.
Nice To Haves
- Experience with Recursive Self-Improvement for AI agents, including closed improvement loops based on agent runs, failures, and evaluation results, with blind evaluation, overfitting audits, regression gates, and human review before production.
- Experience with e-commerce marketplaces and seller-side tooling, including product catalogs, category taxonomies, attributes and variants (SPU/SKU), and ERP, multichannel listing, or fulfillment integrations such as Shopify, Walmart, Amazon MCF, or SellerCloud.
- Prior experience in a forward-deployed, solutions, technical consulting, or professional-services role, embedding with business teams or external clients to scope ambiguous problems, deliver production AI solutions, and drive adoption end-to-end.
- English and Mandarin bilingual fluency for collaboration with SHEIN headquarters engineering teams in China.
- Experience with LangGraph or LangChain.
Responsibilities
- Own the design, development, and production operation of AI-powered product-listing and seller-onboarding tools, including backend services, browser-extension front ends, and multi-agent workflows that turn heterogeneous seller data into verified mapping plans and published listings, with human control over high-risk decisions.
- Build and maintain agent evaluation systems, including benchmark and blind holdout datasets from real seller data, end-to-end evaluations of the publishing chain, and evidence-based model and configuration selection across accuracy, stability, latency, and cost.
- Develop recursive improvement loops that use models to analyze task runs, error logs, and evaluation failures, then propose and validate changes to prompts, plans, and mapping rules, with anti-overfitting audits before production changes.
- Build and operate reliable production infrastructure for high-volume file and image processing, asynchronous task orchestration, checkpointing, token-usage and publishing audit trails, observability, security remediation, on-call support, and documentation.
- Own and extend the internal AI automation platform for U.S. business functions, including workforce-productivity automation and accounting workflow automation, from requirements and data-source changes through rollout, stakeholder onboarding, and maintenance.
- Serve as a technical point of contact for SHEIN Open Platform partners by providing API support, UAT and acceptance support, and coordination with SHEIN engineering in China.
- Work with U.S. Marketplace stakeholders and pilot sellers to prioritize features, run demos, and drive adoption from internal tool to seller-facing product.
Benefits
- Healthcare coverage including medical, dental, vision, and prescription drugs.
- Health Savings Account with employer funding.
- Healthcare and dependent-care Flexible Spending Accounts.
- Company-paid basic life and AD&D insurance.
- Company-paid short-term and long-term disability insurance.
- Voluntary benefits including voluntary life and AD&D, hospital indemnity, critical illness, and accident coverage.
- Employee Assistance Program.
- Business Travel Accident Insurance.
- 401(k) Savings Plan with discretionary company match and access to a financial advisor.
- Vacation, paid holidays, floating holidays, and sick days.
- Employee discounts.
- Free swag giveaways.
- Annual holiday party and invitations to pop-ups and other company events.
- Complimentary daily office snacks and beverages.
Stand Out From the Crowd
Upload your resume and get instant feedback on how well it matches this job.
What This Job Offers
Job Type
Full-time
Career Level
Senior
