Senior .NET Backend Engineer – APIs & Enterprise Integrations

u3 infotech pte. ltd.; Singapore; On-site; SGD 90,000 - 150,000; Full time

Job summary

u3 infotech pte. ltd. seeks a Senior .NET Developer to build and maintain enterprise ITSM and platform automation APIs. You will own backend services end-to-end from design through deployment, collaborating with frontend and automation engineers to deliver secure, reliable systems.

The role focuses on RESTful APIs with .NET 8, PostgreSQL schemas, LDAP/AD integration, and Docker-based containerization within CI/CD pipelines. A strong emphasis on testing and code quality is required.

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) and ORMs (Entity Framework).
• Familiarity with containerization (Docker) and CI/CD pipelines.
• Experience with version control (Git) and collaborative workflows.

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 and data access layers.
• Implement authentication/authorization flows including JWT, Windows/Negotiate, and LDAP/AD integration.
• Integrate backend services with third-party systems and internal data APIs.
• Collaborate with frontend engineers to design API contracts for React/TypeScript apps.
• Containerize services with Docker and support CI/CD pipelines.
• Write unit and integration tests and participate in code reviews.
• Troubleshoot production issues with structured logging and observability practices.
• Contribute to architecture decisions for new services.

Skills

C# / .NET

ASP.NET Core

REST APIs

PostgreSQL

Entity Framework

Docker

CI/CD

Git

Unit testing

LDAP / Active Directory

Tools

Npgsql

Job description

u3 infotech pte. ltd. seeks a Senior .NET Developer to build and maintain enterprise ITSM and platform automation APIs. You will own backend services end-to-end from design through deployment, collaborating with frontend and automation engineers to deliver secure, reliable systems.

The role focuses on RESTful APIs with .NET 8, PostgreSQL schemas, LDAP/AD integration, and Docker-based containerization within CI/CD pipelines. A strong emphasis on testing and code quality is required.