Senior C# Developer - C#, React.Js, AWS

ASTEK SINGAPORE INNOVATION TECHNOLOGY PTE. LTD.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

ASTEK SINGAPORE INNOVATION TECHNOLOGY PTE. LTD. is seeking a Senior C# Developer to support trading applications.

The role emphasizes C#, cloud-native tech, and frontend work with ReactJS. You will also engage with agentic coding tools like Claude Code or GitHub Copilot to enhance development. Responsibilities include building backend components, delivering features in AWS environments, and collaborating with cross‑functional teams in an Agile setting.

Qualifications

• Bachelor’s degree in Computer Science/IT or related field.
• Minimum 8 years of development experience.
• Experience with Claude Code, GitHub Copilot or other agentic coding tools.
• Proficient in C#, AWS, EKS, and containerization.
• Strong analytical, problem‑solving and troubleshooting skills.
• Knowledge of UI and React JS.

Responsibilities

• Develop, enhance, and maintain applications supporting Trading and Trade Operations.
• Design and develop backend components using C#.
• Build and support applications deployed within AWS environments.
• Work with Amazon EKS and containerised applications to support scalable deployments.
• Develop and maintain frontend/UI components using ReactJS.
• Troubleshoot application issues and support technical problem resolution.
• Collaborate with business and technical teams to deliver enhancements.
• Participate in Agile development activities, including development, testing, and releases.

Skills

C#

ReactJS

AWS

EKS

Containerization

Claude Code

GitHub Copilot

Agile development

UI Development

Education

Bachelor’s degree in Computer Science/IT

Tools

Claude Code

GitHub Copilot

Job description

Role: Senior C# Developer

ASTEK has been providing IT and Engineering solutions for some of the world's largest industrial and services groups for more than 35 years with 10,000 passionate experts in 22 countries throughout Europe, APAC, Middle East and the Americas

Role Overview

We are looking for a C# Developer to support Trading and Trade Operations applications. The role requires strong hands‑on experience in C#, cloud‑native technologies, and frontend development using ReactJS. You should also have hands on experience in Claude Code, GitHub Copilot or other agentic coding tools in your development work.

Key Responsibilities

• Develop, enhance, and maintain applications supporting Trading and Trade Operations.
• Design and develop backend application components using C#.
• Build and support applications deployed within AWS environments.
• Work with Amazon EKS and containerised applications to support scalable and reliable deployments.
• Develop and maintain frontend/UI components using ReactJS.
• Troubleshoot application issues and support technical problem resolution.
• Collaborate with business and technical teams to deliver application enhancements.
• Participate in Agile development activities, including development, testing, and releases.
• Follow development best practices to ensure application quality and maintainability.

Requirements:

• Possess a degree in Computer Science/Information Technology or related fields.
• Minimum 8 years of experience in development work.
• Claude Code, GitHub Copilot or other agentic coding tools
• Proficient with hands‑on experience in C#, AWS, EKS, and Containerized.
• Possess positive learning and collaborative mindset.
• Strong analytical, problem‑solving and troubleshooting skills.
• Knowledge and experience in UI and React JS.