Senior Full Stack Java Developer (ReactJS / Telecom)

Location: Singapore

About the Company

Optimum Solutions is an enterprise Digital & IT solutions and services company that engineers digital transformation for enterprises characterized by agility, efficiency and innovation. Founded in 1997, The Company is headquartered in Singapore with 4000+ talented employees across offices and global delivery centers in 9 countries.

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 optimization, 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 TypeScript 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 provision engines).
Database & Data Pipeline Management: Optimize 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.
Education: Bachelor's degree in computer science, Information Technology, or a related engineering field.
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), TypeScript, 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).