Senior Java Backend Developer

3 days ago

East Singapore STACKTECH PTE. LTD. Full time $80,000 - $120,000 per year

About the Role

We are looking for Senior Java Backend Developers to join a critical initiative aimed at modernizing and upgrading our legacy system. This role is part of a strategic revamp aligned with the vision set by our R&D team, focused on transitioning our current architecture toward a more maintainable, scalable, and sustainable framework.

You will be instrumental in analyzing the current platform, identifying immediate areas for improvement, and implementing incremental upgrades that align with modern software best practices. This role involves deep collaboration across teams and offers the opportunity to directly shape the future state of a core business system.

Key Responsibilities

  • Analyze and understand the existing legacy system, including its architecture and business logic.
  • Collaborate with the R&D team to align technical modernization efforts with business goals.
  • Perform detailed code reviews, identify technical debt, and propose clean, scalable solutions.
  • Lead or support the design and implementation of new system components and architectural improvements.
  • Work on resolving high-priority issues and introducing incremental upgrades to support long-term maintainability.
  • Help transition the platform toward modern frameworks, tools, and deployment practices.
  • Contribute to the documentation of architectural decisions, development standards, and integration approaches.

Required Skills & Experience

Advanced proficiency in Java and related technologies:

Extensive experience building backend systems with Java, including performance tuning, multithreading, and memory management.

Expertise in the Spring Boot ecosystem:

Strong hands-on knowledge of Spring Boot and associated modules such as Spring Data, Spring Security, and Spring Cloud.

Database design with SQL and NoSQL:

Proven experience designing, optimizing, and maintaining both relational (e.g., PostgreSQL, MySQL) and non-relational (e.g., MongoDB, Cassandra, Redis) databases, including schema modeling and query optimization.

Exposure to Big Data technologies:

Familiarity with large-scale data solutions such as Hadoop, Apache Spark, and Kafka, including their integration into enterprise systems.

Understanding of middleware technologies and integration patterns:

Knowledge of message-oriented middleware and enterprise integration patterns, including tools like Apache Kafka, RabbitMQ, and ActiveMQ. Experience with API gateways (e.g., Kong, Zuul) is a plus.

Strong problem-solving and collaboration skills:

Demonstrated ability to troubleshoot complex issues, work independently, and collaborate effectively within a multi-disciplinary team.

High standards in code quality and technical reviews:

Skilled in reviewing code for clarity, maintainability, and performance. Proactive in refactoring legacy code and ensuring adherence to modern development standards.

Preferred Qualifications

  • Minimum Bachelor's Degree in Computer Science or equivalent.
  • 6 years of software development experience, ideally with a mix of greenfield and legacy systems.
  • Experience in system modernization, migration, or technical transformation projects.
  • Ability to translate business requirements into technical architecture and design.
  • Experience contributing to project management tasks or overseeing development efforts.
  • Candidates fluent in Mandarin are highly preferred as role requires candidate to communicate with Mandarin speaking clients and partners.

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