Senior .NET Backend Engineer: APIs & Enterprise Integrations

jobster private ltd.; Singapore; On-site; SGD 100,000 - 140,000; Full time

Job summary

jobster private ltd. is seeking a Senior .NET Developer to build and maintain our enterprise ITSM and platform automation ecosystem. You will own backend services end-to-end, design RESTful APIs with ASP.NET Core, and work with React front-ends to ensure reliable, secure systems.

You will collaborate with frontend, QA, and infrastructure teams, containerize services with Docker, and contribute to CI/CD pipelines using Jenkins or GitLab CI. Strong debugging and architecture skills are essential.

Qualifications

• 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 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.

Responsibilities

• 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

Skills

C# / .NET

REST APIs

PostgreSQL

EF Core

JWT / Auth

Docker

CI/CD

Git

Unit testing

Architecture/design

Tools

Docker

Git

Jenkins

GitLab CI

SonarQube

log4net

Job description

jobster private ltd. is seeking a Senior .NET Developer to build and maintain our enterprise ITSM and platform automation ecosystem. You will own backend services end-to-end, design RESTful APIs with ASP.NET Core, and work with React front-ends to ensure reliable, secure systems.

You will collaborate with frontend, QA, and infrastructure teams, containerize services with Docker, and contribute to CI/CD pipelines using Jenkins or GitLab CI. Strong debugging and architecture skills are essential.