Antonio Steven Nguyenjee
I am an experienced JAVA/JEE developer with over 10 years specializing in backend API development and integration.
About
I am an experienced JAVA/JEE developer with over 10 years specializing in backend API development and integration. I take pride in writing clear and maintainable code, and I have a proven track record delivering high-profile projects across both public and private sectors. I enjoy leading teams to deliver quality projects efficiently and innovating solutions that reduce downtime and streamline integrations.
Throughout my career, I have worked closely with various organizations ranging from healthcare and police force to banking and telecommunications in Australia, developing scalable APIs and messaging platforms while mentoring developers. My goal is to continue evolving my skills in API-led architectures and cloud technologies while contributing to impactful projects that advance businesses and services.
- 13 years' experience
- Joined August 2025
Industry experience
- Government
- Healthcare
- Financial Services
- Telecommunications
- Transportation & Logistics
Work experience· 8 roles
Designed and implemented an asynchronous messaging platform to integrate HealthLink, ServiceNow, and DataLake. Transformed inbound FHIR messages to HL7 and vice versa. Developed and launched 24 Mule APIs in an API-Led architecture to execute retail business microservices reusable across banking platform applications. Led migration of legacy backend apps to Mule REST APIs integrating Salesforce, ERP, and relational databases. Facilitated team knowledge sharing on MuleSoft API development.
Designed and implemented an asynchronous module to process and transform HL7 messages to JSON/XML and outbound them to Mirth platform. Delivered Power Billing Revenue Collection integration solutions for New South Wales Local Health Districts in Mule, capable of processing up to 200,000 FIFO messages per day. Led and mentored a team of 5 developers ensuring timely delivery and quality. Innovated an automated error-handling mechanism to decrease downtime and authored technical documentation setting company-wide integration standards.
Delivered state-wide firearm events data integration solutions. Applied integration design patterns such as Guarantee Delivery and Correlation-ID. Revised and updated API services for optimal functionality and collaborated on proprietary integration of third-party APIs to enhance product features.
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