Principal Backend Development Engineer (Contract Role)

QUESSCORP SOLUTIONS PTE. LTD.; Singapore; On-site; SGD 140,000 - 190,000; Full time

Job summary

QUESSCORP SOLUTIONS PTE. LTD. in Singapore seeks an experienced backend architect/engineer to own the architecture, design, development and testing of core backend services and enterprise applications using Java.

You will drive modular microservice architectures for scalable integration and lead performance optimizations across the stack. The role requires 10+ years in professional software development with strong Java expertise, API design, and experience guiding technical decisions and code

Qualifications

• Bachelor's degree in Engineering, Computer Science, Information Technology or a closely related discipline.
• 10+ years of professional software development experience with backend focus.
• Strong Java development experience and enterprise backend design/maintenance.
• Experience with microservice architecture, service integration and API design.
• Experience with high-concurrency, high-throughput systems and reliability.
• Solid software architecture and maintainable design knowledge.
• Experience leading technical design decisions and code reviews.
• Practical experience with automated testing and CI/CD including Docker/Jenkins.
• Experience diagnosing production issues, releases, and live system stability.
• Ability to communicate trade-offs and collaborate across business functons.
• Mentor engineers and raise engineering standards.

Responsibilities

• Own architecture, design, development, testing and ongoing improvement of core backend services and enterprise apps using Java.
• Design and evolve modular microservice architectures and service interfaces for scalability and integration.
• Engineer high-concurrency, high-availability backend systems and resolve performance bottlenecks.
• Design robust business workflows with data integrity, traceability and recovery.
• Set technical direction via architecture reviews, design discussions, code reviews and standards.
• Lead production investigations, root-cause analysis and preventive improvements for stability.
• Strengthen delivery with automated testing, CI/CD, release controls and tooling.
• Collaborate with product, QA, infra and other engineers to translate requirements into solutions.
• Coach and mentor engineers, develop technical capability and promote sound practices.
• Evaluate and adopt engineering tools, including AI-assisted development tools, with proper checks.

Skills

Java backend development

Microservice architecture

API design

System scalability

Code reviews

Mentoring

CI/CD pipelines

Automated testing

Cross-functional collaboration

Education

Bachelor's degree in Engineering/CS/IT

Tools

Docker

Jenkins

CI/CD tooling

Job description

Key responsibilities

• Own the architecture, design, development, testing and ongoing improvement of core backend services and enterprise applications, primarily using Java.
• Design and evolve modular microservice architectures and service interfaces that support scalability, maintainability and reliable integration.
• Engineer high-concurrency, high-availability backend systems, identifying and resolving performance bottlenecks across application and service layers.
• Design robust business workflows and data-processing components, with careful attention to data integrity, consistency, traceability and recovery.
• Set technical direction through architecture reviews, design discussions, code reviews and clear engineering standards.
• Lead complex production investigations, coordinate root-cause analysis and implement preventive improvements to system stability and operational reliability.
• Strengthen software delivery practices through automated testing, continuous integration and deployment, release controls and development tooling.
• Work closely with product, QA, infrastructure and other engineering stakeholders to translate requirements into maintainable technical solutions.
• Coach and mentor engineers, support technical capability development and promote sound engineering practices across the team.
• Evaluate and responsibly adopt engineering tools, including AI-assisted development tools, where they improve implementation, debugging, test validation and technical documentation.

Essential requirements

• Bachelor's degree in Engineering, Computer Science, Information Technology or a closely related discipline.
• At least 10 years of professional software development experience, including substantial hands-on backend engineering experience.
• Strong, practical Java development experience and a track record of designing, building and maintaining enterprise-scale backend applications.
• Demonstrated experience with microservice architecture, service integration, API design and distributed application principles.
• Experience designing or operating systems with demanding concurrency, throughput, availability, scalability and reliability requirements.
• Strong understanding of software architecture, application performance, data integrity, fault handling and maintainable system design.
• Experience leading technical design decisions, conducting code and design reviews, and taking ownership of complex engineering deliverables.
• Practical experience with automated testing and software delivery practices, including Docker, Jenkins and CI/CD pipelines.
• Experience diagnosing production issues, managing releases and improving the stability and quality of live systems.
• Ability to communicate technical trade-offs clearly and collaborate effectively across engineering and business functions.
• Demonstrated ability to mentor engineers and raise the technical standards of a development team.

Advantageous experience

• Experience integrating AI-assisted development tools into established engineering workflows, with appropriate human review, testing and quality controls.
• Experience designing enterprise workflows involving complex business rules, reconciliation, data migration or high-volume order and inventory processing.
• Experience establishing engineering standards, improving development productivity or leading cross-functional technical initiatives.