Senior Full Stack Java Developer (ReactJS / Telecom)

Optimum Solutions (Singapore) Pte Ltd.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Optimum Solutions (Singapore) Pte Ltd. is seeking an experienced Senior Full Stack Java Developer with a backend emphasis to lead design and development of high-throughput, microservices-based platforms for a major telecom client in Singapore.

You will work on REST APIs with Java 17+, Spring Boot, and Spring Cloud, while building responsive frontend dashboards with ReactJS. Strong telecom domain knowledge and cloudDevOps experience are highly valued.

Qualifications

• 6–8 years of professional software development experience with full-stack capabilities.
• Deep hands-on Java 11/17+, Spring Boot, Spring MVC, Spring Security, Hibernate/JPA; microservices patterns.
• Frontend expertise in ReactJS, TypeScript, Redux, HTML5, CSS3, and modern JS tooling.
• Telecom domain experience or high-concurrency real-time systems preferred.
• Relational DBs (PostgreSQL, Oracle, MySQL) and NoSQL (MongoDB, Redis) proficiency.
• Experience with Kafka or RabbitMQ and enterprise RESTful API design.
• Strong Agile, CI/CD, Git, and automated testing (JUnit, Mockito, Jest).

Responsibilities

• Backend development (70%): design and implement high-performance REST APIs using Java 17+, Spring Boot, and Spring Cloud.
• Frontend development (30%): build responsive UI dashboards with ReactJS and Redux to show real-time metrics.
• Architect microservices for telecom integration and high availability across OSS/BSS, billing, and CRM.
• Optimise databases and implement event-driven data pipelines using Kafka/RabbitMQ.
• DevOps & Cloud: deploy via Docker/Kubernetes on AWS/GCP; maintain CI/CD pipelines.
• Ensure code quality through reviews and tests; mentor junior engineers in Agile/Scrum.

Skills

Core Java

Spring Boot

ReactJS

Microservices

SQL/NoSQL

Docker

Kubernetes

CI/CD

Agile/Scrum

RESTful APIs

Education

Bachelor's degree in Computer Science

Tools

Kafka

RabbitMQ

Jenkins

Git

PostgreSQL

Oracle

MySQL

MongoDB

Redis

AWS

Job description

Role Overview

We are seeking an experienced Senior Full Stack Java Developer with a strong backend emphasis to join our engineering team supporting a major telecommunications client. You will lead the design and development of high-throughput, microservices-based platforms, integration pipelines, and telecom web applications. The ideal candidate brings strong expertise in Java enterprise frameworks, scalable REST API architecture, database optimisation, and modern ReactJS interfaces.

Key Responsibilities

• Backend Development (70%): Design, build, and maintain high-performance, fault-tolerant backend services and RESTful APIs using Java 17+, Spring Boot, and Spring Cloud.


• Frontend Development (30%): Build responsive, intuitive user interfaces and dashboards using ReactJS, Redux/Context API, and Type to display real-time network and service metrics.


• System Architecture & Telecom Integration: Architect microservices for high availability, integrating with core telecom domain systems (e.g., OSS/BSS, billing, CRM, or provisioning engines).


• Database & Data Pipeline Management: Optimise SQL (PostgreSQL/Oracle) and NoSQL databases; implement asynchronous message queues (Kafka, RabbitMQ) for event-driven systems.


• DevOps & Cloud: Deploy microservices via Docker and Kubernetes on cloud platforms (AWS/GCP); maintain CI/CD pipelines (Jenkins, GitLab CI).


• Quality & Collaboration: Conduct code reviews, implement unit/integration tests (JUnit, Mockito, Jest), and mentor junior engineers within an Agile/Scrum environment.

Key Requirements

• Experience: 6 to 8 years of professional software development experience, with a proven track record as a Full Stack Developer.


• Core Java Mastery: Deep hands-on experience with Java 11/17+, Spring Boot, Spring MVC, Spring Security, Hibernate/JPA, and microservices design patterns.


• Frontend Expertise: Proficient with ReactJS (Hooks, Functional Components), Type , Redux, HTML5, CSS3, and modern JS build tools (Webpack/Vite).


• Telecom Domain Knowledge: Strong preference for experience working on telecom applications, high-concurrency systems, BSS/OSS platforms, or real-time event processing.


• Database Skills: Advanced proficiency in relational databases (PostgreSQL, Oracle, or MySQL) and query tuning; exposure to NoSQL solutions (MongoDB, Redis).


• Integration & Messaging: Proven experience with message brokers (Apache Kafka or RabbitMQ) and designing enterprise RESTful APIs.


• Methodology: Strong background in Agile practices, CI/CD tools, Git, and automated testing frameworks.

Preferred Qualifications

• Familiarity with TM Forum Open APIs or telecom-specific standards.


• Hands-on experience with service mesh architectures (Istio) and API Gateways (Kong, Apigee).


• Bachelor's degree in Computer Science, Information Technology, or a related engineering field.