Wei C.
✓ Vetted CrafterStaff Software Engineer – Testing & Maintenance
I build test suites and maintain systems — quality that prevents regressions.
About
I build test suites and maintain systems. I have built QA automation for 10+ products and refactored 5+ legacy codebases. I specialise in Jest, Playwright, and test strategy. Cursor helps me generate test cases and understand complex flows. I work with TypeScript, Node.js, PostgreSQL, and Docker.
My focus is on quality and maintainability: comprehensive test coverage, flaky test detection, and refactoring that reduces tech debt. I have built e2e suites for banking and government platforms with strict compliance requirements. I also maintain production systems: fixing bugs, updating dependencies, and improving code quality. Tests and maintenance prevent incidents.
AI Expertise
Notable Projects
Vertex AI ML Platform for Singapore Bank
Designed and deployed a full ML platform on GCP Vertex AI for a MAS-regulated bank. Built automated training pipelines with Kubeflow Pipelines, model versioning with Vertex AI Model Registry, canary deployments via Vertex AI Endpoints, and comprehensive model governance including model cards and bias evaluation reports required by MAS.
✓ Platform serves 25 models in production; passed MAS AI governance audit with no critical findings; model deployment cycle time reduced from 6 weeks to 4 days.
LLM-Powered Supply Chain Intelligence Platform
Built a full-stack supply chain intelligence product for a Singapore logistics company: BigQuery for data warehouse, Vertex AI for demand forecasting models, and a LangChain-based AI assistant with RAG over shipping documents, port schedules, and regulatory data. React frontend with real-time alerts.
✓ Demand forecast accuracy improved 31%; AI assistant handles 70% of customs and compliance queries autonomously; operations team productivity increased 45%.
Fairness-Aware Credit Scoring Pipeline
Designed a credit scoring ML pipeline with embedded fairness evaluation using Vertex AI and the Responsible AI Toolkit. Built automated bias detection across demographic segments, model cards generation, and a monitoring dashboard that tracks fairness metrics (demographic parity, equal opportunity) alongside accuracy metrics in production.
✓ Demographic parity gap reduced from 12% to 2.1% without significant AUC degradation; model governance documentation accepted by MAS in first review; deployed to serve 500K credit applications annually.
Work Experience
Staff ML Platform Engineer
GovTech Singapore
2020 – Present
Own the government AI platform serving 10+ government agencies. Define ML governance standards for Singapore public sector AI deployments, including the first responsible AI evaluation framework adopted by a Singapore government agency.
Senior ML Engineer
Sea Group (Shopee)
2016 – 2020
Built recommendation and fraud detection ML systems for the Shopee marketplace across Southeast Asia. Scaled models from Singapore pilot to 7-country deployment on GCP infrastructure.
Education & Certifications
M.Sc. Computer Science (Machine Learning)
National University of Singapore · 2015
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