Senior .NET Developer

USER EXPERIENCE RESEARCHERS PTE. LTD.; Singapore; On-site; SGD 90,000 - 150,000; Full time

Job summary

User Experience Researchers PTE. LTD. in Singapore seeks an experienced backend engineer to design, build, and maintain RESTful APIs and services using .NET 8 / ASP.NET Core.

You will work with PostgreSQL, implement authentication flows, and collaborate with frontend teams to define clean API contracts for React/TypeScript. Dockerization and CI/CD pipelines will be core parts of the role. The ideal candidate has 5+ years in backend development, strong API design expertise, and experience with

Qualifications

• 5+ years of backend experience in C#/.NET with ASP.NET Core.
• Strong REST API design and secure coding practices.
• Experience with relational DBs (PostgreSQL/SQL Server) and ORMs (EF).
• Familiarity with Docker and CI/CD pipelines.
• Version control with Git and collaborative workflows.

Responsibilities

• Design, build, and maintain RESTful APIs and backend services in .NET 8 / ASP.NET Core.
• Work with PostgreSQL schemas, efficient queries, and data access layers.
• Implement and maintain authentication/authorization flows and directory service integrations.
• Integrate backend services with enterprise systems and ITSM platforms.
• Collaborate with frontend engineers to design API contracts for React/TypeScript.
• Containerize services with Docker and support CI/CD pipelines (Jenkins, GitLab CI).
• Write unit/integration tests and participate in code reviews.

Skills

C# / .NET

ASP.NET Core

REST API design

PostgreSQL

Entity Framework

Docker

CI/CD

Git

Authentication/Authorization

Testing & QA

Tools

Npgsql

React/TypeScript (basic)

Job description

Key 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 enterprise authentication and directory services integration
• Integrate backend services with third-party and enterprise systems (e.g., ITSM platforms, directory services, internal enterprise 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 enterprise directory services 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