Douglas Chan
I’m Douglas Chan, a senior full stack engineer with 9+ years of experience building secure, scalable enterprise systems, especially in healthcare.
About
I’m Douglas Chan, a senior full stack engineer with 9+ years of experience building secure, scalable enterprise systems, especially in healthcare. I’m proficient in JavaScript and Python, and I enjoy owning end-to-end delivery—turning complex workflows into reliable products with strong system design, cloud architecture, and database foundations.
Across recent roles, I’ve built and shipped production features for NSW Health’s statewide procurement and supply chain platforms, including contract lifecycle management and traceability workflows, with hardened authentication/authorization and robust data validations. I’ve also developed mobile and web solutions that improve clinical and operational processes, such as an offline-first biopsy collection app for theatre nurses and automation that consolidates invoicing into management reporting—while staying focused on code quality, collaboration, and measurable outcomes.
- 7 years' experience
- Joined November 2026
Industry experience
- Healthcare
- Software & Internet
- Education
- Government
Work experience· 6 roles
Built and maintained a React Native (Expo, TypeScript) biopsy collection application used by theatre nurses to manage the end-to-end clinical specimen collection workflow, including labeling, form generation, chain-of-custody, and audit tracing. Designed offline fallback to support uninterrupted work during intermittent connectivity, with background sync uploads. Implemented automation using Copilot Studio to consolidate monthly invoices and generate management reports. Supported Microsoft 365 business suite rollout, including user/department management, IT security, device and application security management, role-based access controls, and IDP SSO for GitHub.
Delivered end-to-end features for NSW Health’s SmartChain procurement and supply chain platform. Worked on sourcing and contracts (S&C) and contributed to contract lifecycle management (CLM), converting complex contract-stage workflows into functional, secure UI/UX and hardened backend services. Built secure, role-based APIs with JWT/OAuth and SAML SSO session management, plus strict database validation. Implemented full-stack CRUD for procurement requests, contract amendments and version history, contract notes, document upload/download, and CSV import/export. Also supported traceability/inventory tracking work, including integrating AWS microservices and adding handheld barcode/QR scanning aligned with ISO/IEC 15420 and GS1 2D symbology. Contributed to delivery across core repositories, stakeholder collaboration, production bug fixing, and code/testing quality standards.
Developed new features for a React Native product and related microservice components, and supported core client projects by managing dependency updates, regression support, and client release rollouts. Contributed to a production account recovery feature using user secret questions and answers. Served as regression dev lead for pre-deployment phases. Focused on maintaining repo module versions, clean code and testing consistency, and writing documentation for releases and support.
Education· 6
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