Software Engineer - .NET Core

U3 INFOTECH PTE. LTD.; Singapore; On-site; SGD 90,000 - 160,000; Full time

Job summary

U3 INFOTECH PTE. LTD. is seeking a Software Engineer (Full Stack) to own end-to-end development of financial-grade software. You will work on microservices using .NET Core/.NET 8, Java, and cloud-native patterns within an agile team.

The role covers backend and frontend development, including Docker-based deployments, EF data access, and security best practices. Prior experience with WebForms, AWS, and Open Telemetry is highly valued.

Qualifications

• Proven professional experience with .NET Core stack and C#/.NET 8.
• Experience building microservices and event-driven designs.
• EF for database interaction; familiarity with Oracle is a plus.
• Docker containerization and deployment in Windows/IIS environments.
• OAuth-based authentication/authorization and security best practices.
• AWS services (S3, Lambda, API Gateway, RDS) for backend development.
• Frontend tech: HTML, CSS, JavaScript, ASP.NET, WebForms.

Responsibilities

• Design, develop, and maintain microservices architecture using .NET Core, .NET 8 and Java.
• Implement event-driven patterns and integrate with AWS services.
• Utilize EF for efficient database interactions and management.
• Containerize applications using Docker and manage deployments on Windows/IIS.
• Apply Domain-Driven Design principles for clean, modular code architecture.
• Develop RESTful API endpoints for frontend-backend communication.
• Support legacy .NET Framework apps and migrate to modern .NET where applicable.
• Frontend development with ASP.NET WebForms and responsive UI components.
• Collaborate with UX/UI designers to implement intuitive interfaces.
• Write unit tests and leverage AI-assisted review for code quality.

Skills

NET Core

C#

Java

Frontend development

ASP.NET

WebForms

Docker

AWS

DDD

OAuth

Security best practices

Entity Framework

Open Telemetry

Tools

Docker

EF

AWS

Oracle

Quarkus

Storybook

Job description

Role: Software Engineer- Full Stack (.NET)

Duration: 12 Months (renewable)

Job Summary:

As a Software Engineer (Full Stack), you will be responsible for the end-to-end solutioning and development of software and web applications. You will be part of an agile team responsible for products used by the Financial Industry and MAS officers for Financial Supervision function.

Key Responsibilities:

Backend Development:

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

Frontend Development:

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

Requirements:

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

Preferred Qualifications:

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