Senior .NET Backend Engineer – APIs, Docker, CI/CD

RAPSYS TECHNOLOGIES PTE LTD; Singapore; On-site; SGD 110,000 - 170,000; Full time

Job summary

RAPSYS TECHNOLOGIES PTE LTD in Singapore is seeking a Senior .NET Developer to design, develop, and maintain enterprise-grade backend services using .NET 8 / ASP.NET Core. You will build RESTful APIs, work with PostgreSQL via EF, implement authentication, containerize with Docker, and collaborate with frontend teams while ensuring code quality and CI/CD pipelines.

The ideal candidate has 5+ years of experience, strong debugging and problem-solving skills, and a proven ability to work across

Qualifications

• 5+ years of professional backend experience in C#/.NET (ASP.NET Core preferred).
• Strong REST API design and secure coding practices.
• Experience with relational databases (PostgreSQL/SQL Server) and ORMs.
• Familiarity with Docker and CI/CD pipelines.
• Proficient in Git and collaborative development workflows.
• Solid debugging, troubleshooting, and problem-solving skills.

Responsibilities

• Design, build, and maintain RESTful APIs and backend services.
• Work with PostgreSQL schemas and data access layers via EF.
• Implement authentication/authorization patterns (JWT, LDAP/AD).
• Integrate backend with enterprise systems and front-end teams.
• Containerize services with Docker and support CI/CD pipelines.
• Write tests, perform code reviews, and uphold quality standards.
• Troubleshoot production issues with observability tooling.
• Contribute to architectural decisions for new services.

Skills

Backend development

REST API design

Authentication/Authorization

CI/CD pipelines

Unit testing

Troubleshooting

Git version control

Cross-functional collaboration

Tools

Docker

Git

Entity Framework

PostgreSQL

ASP.NET Core

Job description

RAPSYS TECHNOLOGIES PTE LTD in Singapore is seeking a Senior .NET Developer to design, develop, and maintain enterprise-grade backend services using .NET 8 / ASP.NET Core. You will build RESTful APIs, work with PostgreSQL via EF, implement authentication, containerize with Docker, and collaborate with frontend teams while ensuring code quality and CI/CD pipelines.

The ideal candidate has 5+ years of experience, strong debugging and problem-solving skills, and a proven ability to work across