John Wong

Enterprise applications, finance workflows and operations automation for construction and engineering teams — from stakeholder requirements through design, build, deployment and support. On the Operations team since September 2026, working in an Agile team on IT service and procurement automation.

• Designed and built an LLM-driven IT service request (ITSM) platform to replace a legacy ServiceNow-based eForm while keeping its user experience, approval processes and compliance: Azure OpenAI intent routing and slot filling, user confirmation before submission and Microsoft Graph approval chains (preparing for production rollout).
• Built a reusable, in-process workflow engine inspired by n8n, with a VS Code extension where developers draw flows and drop them straight into the system — no third-party workflow service to depend on.
• Designed and built a cross-domain Active Directory password-reset service with a Go master and Java / Spring Boot domain agents, encrypted agent commands, retries and idempotent jobs (preparing for production rollout).
• Architected a React microfrontend shell hosting five business modules with runtime bundle loading, lifecycle contracts and independent releases on Docker, AKS and Azure DevOps — cutting deployment downtime from about 2 minutes to about 1 minute (~50%).
• Re-engineered a data-heavy module view with parallel loading, data chunking and lazy rendering, taking the load-to-full-render path from about 30 seconds to about 100 ms.
• Delivered an invoice-matching workflow for ~200 invoices a day, using LLM-assisted OCR, PO matching and preparer / checker / approver steps to cut manual field entry by about 30%.
• Built forecasting modules and reusable components with Redis caching, Vitest and Playwright end-to-end tests, and revamped logistics and modular-construction progress dashboards.
• Deployed and integrated an open-source CodePush server supporting rollout, rollback and version targeting for the company’s mobile apps.
• Led the evaluation of AI coding assistants (Cursor vs GitHub Copilot) under legal and data-compliance constraints, then wrote usage guidelines and trained colleagues in a department of about 80 people.

React · TypeScript · NestJS · C# / .NET · Go · Java / Spring Boot · Azure OpenAI · Entra ID · AKS · Azure DevOps · Playwright

Independent client delivery since 2024, incorporated in June 2026 and run alongside my full-time role. I own discovery, scoping and pricing, product and UI/UX design, architecture, full-stack build, deployment and ongoing support.

• Lead developer of a clinic operations platform now serving four branches; at the three-branch stage (May 2026) it supported 36 staff, around 2,638 bookings and 3,100 WhatsApp notifications a month.
• Cut medication intake from about 10 minutes to about 1 minute with OCR, human review and unit / weight checks, offloading scans to an SQS-triggered AWS Lambda.
• Reverse-engineered a legacy PowerBuilder / MySQL system and migrated about 5 years of history into a redesigned PostgreSQL schema, with two months of one-way sync between old and new systems.
• Traced a production slowdown through CloudWatch to overlapping client requests and a redundant refresh loop, then shipped single-flight requests, debouncing and background-tab pausing.
• Built a multi-company factory platform covering purchase orders, revisions, production, delivery, invoicing and forecasting with OCR document extraction and review, now in use on a pilot basis.
• Building a mobile receipt and expense app with async OCR on S3 / Lambda, bill splitting, multi-currency records and exports.

Next.js · React · Express · NestJS · PostgreSQL · TypeORM · AWS ECS / Lambda · Terraform · Cloudflare · React Native

Led and worked with a small engineering team on LookCard, a white-label fintech and Web3 card platform, owning architecture, technical trade-offs and delivery of payment, identity and cloud integrations; also contributed to a multi-cloud billing automation platform.

• Designed and deployed AWS wallet and transaction workflows with Step Functions, API Gateway, Lambda and RDS.
• Integrated Sumsub eKYC with one-to-one applicant mapping, token-verified callbacks, status sync and a support-assisted recovery path.
• Implemented DID-based OIDC login, RBAC, a separated admin portal, server-side secrets and audit logging.
• Built a reusable Pulumi and Docker framework to standardise new API setup.
• Contributed to cloud account, billing and operations automation with AWS CDK, Fargate, SQS / SNS and Puppeteer.

TypeScript · Node.js · React · AWS Lambda · Step Functions · RDS · Pulumi · AWS CDK · Terraform · OIDC

Modernised services, kiosks and payment flows for a large charitable organisation.

• Designed microservices on Docker and Kubernetes and built a Go API gateway with role-based access control.
• Integrated Mastercard Payment Gateway Services (MPGS) 3-D Secure for kiosk / POS payments, including challenge handling and server-side verification.
• Revamped and maintained a visitor-guidance kiosk and app with Electron and React Native.

Go · Docker · Kubernetes · MPGS · 3-D Secure · Electron · React Native

Programmer (full-time, Oct 2020 – Jun 2021) and Senior Programmer (part-time, Oct 2022 – Mar 2023), after a Unity game-development internship in 2019.

• Built Puppeteer automation that places e-commerce orders for a logistics company.
• Built an activity registration and lottery web application for a government department.
• Ran a security assessment and fixed the findings, and sped up data fetching and formatting for reports.

Node.js · Express · Puppeteer · Nginx