Backend-focused full-stack developer based in regional Australia.
I work mainly with Java, Spring Boot, PostgreSQL, Keycloak/OAuth2, Docker, React, and TypeScript. My current portfolio focus is Multiapp, a deployed multi-tenant ticketing and appointment SaaS demo.
- Live demo: https://multiapp-frontend.pages.dev/demo
- Walkthrough video: 90-second Multiapp demo
- Backend repository: https://github.com/jastoninfer/multiapp-backend
- Frontend repository: https://github.com/jastoninfer/multiapp-frontend
Multiapp is a SaaS demo for service desk work. It supports tickets, appointments, resources, contacts, tenant members, tenant switching, role-based pages, audit logs, and user profile flows.
All demo accounts use Demo123!.
| Role | Account | What to check |
|---|---|---|
| Tenant admin | tenant.admin@acme.demo |
Dashboard, tickets, appointments, members, tenant settings, audit logs |
| Agent | agent@acme.demo |
Ticket owner changes, comments, contacts, scheduling |
| Resource user | resource@acme.demo |
Appointments and availability |
| Customer | customer@acme.demo |
Customer ticket view |
Backend
- Tenant request context:
common/tenant - Authorization rules:
*/auth - Ticket workflow:
ticket - Appointment and availability rules:
appointment,resource - Idempotency, audit, outbox, rate limiting:
idempotency,audit,outbox,common/ratelimit - Database migrations and seed data:
src/main/resources/db/migration,demo - CI/CD:
.github/workflows/backend-ci-cd.yml
Frontend
- Login, PKCE, token refresh:
src/auth - API client and tenant headers:
src/api/client.ts - Role-aware layout:
src/components/Layout.tsx - Ticket and appointment pages:
src/pages,src/components - Query keys and cache refresh:
src/queryKeys.ts,src/cache - CI/CD:
.github/workflows/frontend-ci-cd.yml
CI/CD means the project is checked and deployed through a repeatable pipeline instead of manual one-off steps.
For this project:
- Backend CI runs tests and builds a Docker image.
- Backend CD deploys the
mainbranch to a VPS through GitHub Actions secrets, restarts Docker Compose, and runs a health check. - Frontend CI installs dependencies and builds the Vite app.
- Frontend CD deploys the static build to Cloudflare Pages and runs a smoke test.
The README files inside the frontend and backend repos include the setup details without exposing private server values.
Backend: Java, Spring Boot, Spring Security, REST APIs, JPA/Hibernate
Database: PostgreSQL, Flyway, SQL, MySQL, Redis, Elasticsearch
Frontend: TypeScript, React, Vite, React Router, TanStack Query
DevOps: GitHub Actions, Docker, Docker Compose, Caddy, Linux VPS, Cloudflare Pages
Other: C/C++, Python, OpenMP, CMake
- Master of Information Technology, Charles Darwin University
- Bachelor of Computer Science, Beihang University
- Graduate-level data science study, Peking University
- Engineering experience through Meituan and Huawei
- LinkedIn: https://www.linkedin.com/in/jie-zhang-jastoninfer/
- Email: astoninfer@gmail.com