Senior Java Full-Stack Engineer - Telecom Microservices

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 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, leveraging Java, Spring, and React for robust, scalable solutions.

Qualifications

• 6 to 8 years of professional software development experience, with a proven track record as a Full Stack Developer.
• Core Java mastery with Java 11/17+, Spring Boot, Spring MVC, Spring Security, Hibernate/JPA, and microservices design patterns.
• Frontend expertise with ReactJS, TypeScript, Redux, HTML5, CSS3, and modern JS build tools.
• Telecom domain knowledge with experience on high-concurrency systems or OSS/BSS.
• Proven experience designing enterprise RESTful APIs and working with message brokers like Kafka or RabbitMQ.
• Strong background in Agile practices, CI/CD tools, Git, and automated testing frameworks.

Responsibilities

• Backend Development (70%): Design, build, and maintain high-performance backend services and RESTful APIs using Java 17+, Spring Boot, and Spring Cloud.
• Frontend Development (30%): Build responsive UIs and dashboards using ReactJS, Redux/Context API, and TypeScript to display real-time metrics.
• System Architecture & Telecom Integration: Architect microservices for high availability and integration with OSS/BSS, billing, CRM.
• Database & Data Pipeline Management: Optimise PostgreSQL/Oracle/MySQL; NoSQL; implement Kafka/RabbitMQ for event-driven systems.
• DevOps & Cloud: Deploy via Docker & Kubernetes on AWS/GCP; maintain CI/CD pipelines (Jenkins, GitLab CI).
• Quality & Collaboration: Conduct code reviews, write unit/integration tests (JUnit, Mockito, Jest), mentor juniors in Agile/Scrum.

Skills

Java

Spring Boot

Spring MVC

Spring Security

Hibernate/JPA

Microservices

ReactJS

TypeScript

Redux

HTML/CSS/JS

Webpack/Vite

PostgreSQL/Oracle/MySQL

NoSQL MongoDB

Kafka/RabbitMQ

REST APIs

Docker/Kubernetes

AWS/GCP

CI/CD

JUnit/Mockito/Jest

Agile

Git/GitLab

Education

Bachelor's degree in Computer Science/IT

Tools

Git

Docker

Kubernetes

Jenkins

GitLab CI

Job description

OPTIMUM SOLUTIONS (SINGAPORE) PTE LTD is seeking an experienced Senior Full Stack Java Developer with a 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, leveraging Java, Spring, and React for robust, scalable solutions.