Software Engineer (Full Stack) .NET Core, Java

NTT SINGAPORE PTE. LTD.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

NTT Singapore Pte. Ltd. seeks a skilled full‑stack engineer to design, develop, and maintain microservices using .NET Core/.NET 8 and Java. You will architect event‑driven patterns, utilize EF, and containerize with Docker for scalable deployments.

You will implement OAuth, secure coding practices, and work with AWS services (S3, Lambda, API Gateway, RDS) while building RESTful APIs and SPA frontends. Knowledge of Quarkus and OpenTelemetry is a plus.

Qualifications

• Proven professional experience with .NET Core stack and Java.
• Strong proficiency in .NET Core, .NET 8, C#, Java and related backend technologies.
• Experience building microservices and event-driven designs.
• EF for database management and SQL knowledge.
• Docker and containerization principles.
• DDD and modern backend architecture.
• OAuth for authentication/authorization.
• Security best practices for backend systems.
• AWS services: S3, Lambda, API Gateway, RDS, etc.
• Frontend basics: HTML, CSS, JavaScript, ASP.NET, WebForms.
• Unit tests and design systems (Storybook).
• Generative AI usage for Spec Driven Development (SDD).
• Legacy .NET Framework maintenance and migrations.
• IIS and Windows Server deployment with config transforms.
• Java Quarkus for cloud-native microservices and observability.

Responsibilities

• Design, develop, and maintain microservices architecture on .NET Core/.NET 8 and Java.
• Implement event-driven communication between services.
• Utilize EF for efficient database interactions.
• Containerize apps with Docker for scalability.
• Apply DDD principles for modular code architecture.
• Implement OAuth for secure auth.
• Follow security best practices to protect data and systems.
• Leverage AWS S3/Lambda/API Gateway/RDS for backend needs.
• Develop RESTful APIs for frontend-backend integration.
• Apply SDD concepts using Claude AI tech.
• Support legacy .NET Framework apps with migration paths.
• Manage hosting on IIS/Windows Server with config transforms.
• Develop frontend with ASP.NET/WebForms; write unit tests.

Skills

NET Core

C#

Java

Entity Framework

Docker

DDD

OAuth

AWS

UI/Frontend

Storybook

Unit testing

Generative AI

WebForms

IIS/Windows Server

Quarkus

OpenTelemetry

Oracle DB

React/SPA

Tools

Docker

Oracle DB

IIS

Windows Server

Storybook

OpenTelemetry

Quarkus

Job description

Key Responsibilities

Backend Development:

1. 1. Design, develop, and maintain microservices architecture using .NET Core,.NET 8 and Java.
2. 2. Implement event-driven architecture to enable seamless communication between microservices.
3. 3. Utilize Entity Framework (EF) for efficient database interactions and management.
4. 4. Containerize applications using Docker for scalability and deployment flexibility.
5. 5. Apply Domain-Driven Design (DDD) principles to ensure clean and modular code architecture.
6. 6. Implement OAuth for secure authentication and authorization.
7. 7. Develop and enforce security best practices to safeguard sensitive data and systems.
8. 8. Utilize AWS services such as S3, Lambda, API Gateway, RDS, etc., for backend development.
9. 9. Develop RESTful APIs endpoints to facilitate communication between the frontend and backend.
10. 10. Apply Spec Driven Development (SDD) concepts in development of code via Claude AI technologies.
11. 11. Support and maintain legacy .NET Framework (4.x) applications, including migration pathways to modern .NET where applicable.
12. 12. Manage application hosting and deployment on IIS and Windows Server environments, including environment-specific configuration management using config transformations.

Frontend Development:

1. 1. Develop responsive and user-friendly web applications using ASP.NET, including WebForm applications.
2. 2. Generate and review unit tests using generative AI to ensure code quality and reliability.
3. 3. Create reusable UI components and maintain a consistent design using Storybook.
4. 4. Collaborate closely with UX/UI designers to implement intuitive and visually appealing interfaces.
5. 5. Troubleshoot and debug issues across the stack, ensuring smooth application operation.
6. 6. Optimize application performance and scalability for a seamless user experience.

What we are looking for

Requirements:

1. 1. Proven professional experience working on .NET Core stack.
2. 2. Strong proficiency in .NET Core, .NET 8, C#, Java and related backend technologies.
3. 3. Experience building microservices architecture and implementing event-driven design patterns.
4. 4. Proficiency in Entity Framework (EF) for database management.
5. 5. Familiarity with Docker and containerization principles.
6. 6. Knowledge of Domain-Driven Design (DDD) principles and their application in backend development.
7. 7. Experience implementing OAuth for authentication and authorization.
8. 8. Understanding of security best practices and their application in backend development.
9. 9. Hands-on experience with AWS services such as S3, Lambda, API Gateway, RDS, etc.
10. 10. Proficiency in frontend technologies such as HTML, CSS, and JavaScript, ASP.NET and WebForms.
11. 11. Experience writing unit tests and maintaining a design system with Storybook.
12. 12. Strong problem-solving skills and attention to detail.
13. 13. Excellent communication and collaboration skills.
14. 14. Knowledge and experience in utilizing generative AI to develop and review codes via Spec Driven Development (SDD).
15. 15. Hands-on experience with legacy .NET Framework (4.x) applications, including maintenance and incremental modernisation.
16. 16. Experience with Oracle databases, including query optimisation and integration with .NET applications.
17. 17. Proficiency in deploying and configuring applications on IIS and Windows Server, with working knowledge of Web config transformations for environment-specific deployments.
18. 18. Hands-on experience with Java Quarkus framework, including building and deploying cloud-native microservices, with working knowledge of OpenTelemetry for distributed tracing and observability.

Preferred Qualifications:

1. 19. Preferably more than 5 years of experience as a full stack software engineer.
2. 20. Experience working in both Unix and Windows operating environments are preferred.
3. 21. AWS certification (e.g., AWS Certified Developer, AWS Certified Solutions Architect).
4. 22. Experience with Node.js for server-side development.
5. 23. Familiarity with RDS databases such as MSSQL.
6. 24. Knowledge of CI/CD pipelines and DevOps practices.
7. 25. Understanding of Agile development methodologies.
8. 26. Experience with event-driven development patterns and architectures, as well as frontend development using React or other Single Page Application (SPA) frameworks.