Senior .NET Developer

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

Senior .NET Developer
12 months (renewable)

About the Role

We're looking for a Senior.NET Developer to join the team building and maintaining our enterprise ITSM and platform automation ecosystem — a suite of ASP.NET Core APIs and services that integrate with directory services, service management tools, and internal data stores, backed by React-based front-end applications. You'll own backend services end-to-end, from design through deployment, and work closely with frontend and automation engineers to deliver reliable, secure, and well-tested systems.

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

Requirements;

• 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

Requirements:

• 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