Fullstack Software Engineer - Contract

ZENITH INFOTECH (S) PTE LTD.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

ZENITH INFOTECH (S) PTE LTD. is seeking a Full Stack Software Engineer to design and build cloud-native web apps from ReactJS to Spring Boot microservices. You will implement REST APIs, data modeling with JPA/SQL, and scalable microservices while containerizing with Docker.

Ideal candidates have solid React and Spring experience, and familiarity with AWS services and BPMN workflows. Bonus for AI agent integration and regulated cloud exposure. Join a team delivering secure, role-based systems.

Qualifications

• Proficiency in ReactJS (with Vite tooling) and Spring Boot.
• Strong understanding of JPA, SQL, and relational data modeling.
• Experience designing and consuming REST APIs.
• Hands-on experience with microservices architecture and containerization (Docker).
• Familiarity with AWS services, particularly S3 and SQS.
• Experience with unit testing frameworks and test-driven practices.
• Working knowledge of Gradle and Git.
• Exposure to BPMN workflow engines (e.g., Camunda, Flowable, or similar).
• Experience implementing RBAC in front-end applications.
• Bonus: experience building or integrating AI agents into production systems.
• Bonus: familiarity with AWS GCC or other regulated/government cloud environments.

Responsibilities

• Design, build, and maintain web applications using ReactJS (Vite) on the front end and Spring Boot on the back end.
• Develop and integrate REST APIs, and design data models using JPA and SQL.
• Build and maintain microservices, with attention to scalability and maintainability.
• Containerize applications using Docker for consistent deployment across environments.
• Contribute to the development of an AI agent, integrating it into existing product workflows.
• Work with AWS services (S3, SQS) to support asynchronous processing and file storage.
• Implement local API mocking to support parallel front-end/back-end development and testing.
• Write and maintain unit tests to ensure code quality and reliability.
• Use Gradle and Git for build management and version control.
• Implement BPMN-based workflows to support business process automation.
• Build RBAC-driven UI components to enforce role-based access control across the application.
• Work within AWS GCC (Government/Regulated Cloud environment) where applicable, adhering to relevant compliance and security standards.

Skills

ReactJS

Spring Boot

JPA/SQL

REST APIs

Microservices

Docker

AWS S3

AWS SQS

Gradle

Git

RBAC

BPMN

AI integration

AWS GCC

Tools

Docker

Gradle

Git

Job description

About the Role

We're looking for a Full Stack Software Engineer to join our team building modern, cloud‑native applications. You'll work across the stack — from ReactJS front ends to Spring Boot microservices — while contributing to AI‑driven features, workflow automation, and secure, role‑based systems.

This role suits someone who thrives working independently, takes ownership of their deliverables, and enjoys collaborating across squads in an iterative delivery environment.

Key Responsibilities

• Design, build, and maintain web applications using ReactJS (Vite) on the front end and Spring Boot on the back end
• Develop and integrate REST APIs, and design data models using JPA and SQL
• Build and maintain microservices, with attention to scalability and maintainability
• Containerize applications using Docker for consistent deployment across environments
• Contribute to the development of an AI agent, integrating it into existing product workflows
• Work with AWS services (S3, SQS) to support asynchronous processing and file storage
• Implement local API mocking to support parallel front‑end/back‑end development and testing
• Write and maintain unit tests to ensure code quality and reliability
• Use Gradle and Git for build management and version control
• Implement BPMN‑based workflows to support business process automation
• Build RBAC‑driven UI components to enforce role‑based access control across the application
• Work within AWS GCC (Government/Regulated Cloud environment) where applicable, adhering to relevant compliance and security standards

Required Skills & Experience

• Proficiency in ReactJS (with Vite tooling) and Spring Boot
• Strong understanding of JPA, SQL, and relational data modeling
• Experience designing and consuming REST APIs
• Hands‑on experience with microservices architecture and containerization (Docker)
• Familiarity with AWS services, particularly S3 and SQS
• Experience with unit testing frameworks and test‑driven practices
• Working knowledge of Gradle and Git
• Exposure to BPMN workflow engines (e.g., Camunda, Flowable, or similar)
• Experience implementing RBAC (Role‑Based Access Control) in front‑end applications
• Bonus: experience building or integrating AI agents into production systems
• Bonus: familiarity with AWS GCC or other regulated/government cloud environments