Dot Net Developer

RAPSYS TECHNOLOGIES PTE. LTD.; Singapore; On-site; SGD 70,000 - 110,000; Full time

Job summary

RAPSYS TECHNOLOGIES PTE. LTD. in Singapore is seeking a Dot Net Developer to design, build, and maintain RESTful APIs and backend services using .NET 8 / ASP.NET Core. You will work with PostgreSQL, implement authentication flows, and collaborate with frontend teams to define API contracts.

You'll containerize services with Docker, support Jenkins or GitLab CI pipelines, write tests, and participate in code reviews while upholding code quality and observability practices across the stack.

Qualifications

• Minimum 5+ years of backend experience in C#/.NET and ASP.NET Core.
• Design and implement REST APIs with secure coding practices.
• Experience with relational databases (PostgreSQL/SQL Server) and ORM (EF).
• Familiarity with Docker and CI/CD pipelines.
• Proficient version control and collaborative workflows (Git).
• Strong debugging and problem-solving skills; clear communication.

Responsibilities

• Design, build, and maintain RESTful APIs and backend services.
• Integrate with PostgreSQL and manage data access layers.
• Implement authentication/authorization flows, including JWT and LDAP when needed.
• Collaborate with frontend teams to define API contracts.
• Containerize services with Docker and support CI/CD pipelines.
• Write unit and integration tests and participate in code reviews.
• Troubleshoot production issues with logging and observability.
• Contribute to architecture decisions for new services.

Skills

C# / .NET

REST API design

Secure coding

Troubleshooting

Communication

CI/CD pipelines

Tools

Docker

PostgreSQL

Entity Framework

Git

Jenkins

GitLab CI

SonarQube

Job description

Role: Dot Net Developer

JD:

What You'll Do

• Design, build, and maintain RESTful APIs and backend services using .NET 8 / ASP.NET Core
• Work with PostgreSQL (via Npgsql/Entity Framework) to design schemas, write efficient queries, and manage data access layers
• Implement and maintain authentication/authorization flows, including JWT bearer auth, Windows/Negotiate authentication, and LDAP/Active Directory integration
• Integrate backend services with third-party and enterprise systems (e.g., ServiceNow-style ITSM platforms, directory services, internal data APIs)
• Collaborate with frontend engineers to design clean API contracts consumed by React/TypeScript applications
• Containerize services with Docker and support CI/CD pipelines (Jenkins, GitLab CI)
• Write unit and integration tests, participate in code reviews, and uphold code quality standards (e.g., SonarQube)
• Troubleshoot and resolve production issues across the stack, with structured logging (log4net) and observability practices
• Contribute to architecture decisions for new services and the evolution of existing ones

What We're Looking For

• 5+ years of professional experience building backend services in C# / .NET (ASP.NET Core preferred)
• Strong understanding of REST API design, authentication/authorization patterns, and secure coding practices
• Experience working with relational databases (PostgreSQL, SQL Server, or similar) and ORMs (Entity Framework or equivalent)
• Familiarity with containerization (Docker) and CI/CD pipelines
• Experience with version control (Git) and collaborative development workflows
• Strong debugging, troubleshooting, and problem-solving skills
• Clear written and verbal communication, with the ability to work cross-functionally with frontend, QA, and infrastructure teams

Nice to Have (Advantages)

• Full-stack development experience — comfort working across the stack with React/TypeScript front ends, from API design to UI integration
• AI/ML knowledge — familiarity with applying AI/LLM tooling to developer workflows, automation, or product features (e.g., integrating LLM APIs, prompt engineering, or AI-assisted development practices)
• Automation experience with Python and/or Ansible Automation Platform (AAP) — building or maintaining scripts, playbooks, or jobs for infrastructure automation, compliance checks, or operational tooling

What Makes You Stand Out

• Experience integrating enterprise systems with LDAP/Active Directory or similar identity providers
• Exposure to hybrid environments where .NET services, Node/React front ends, and Python-based automation coexist and need to interoperate
• A track record of improving reliability, security, or maintainability of backend systems in a production environment