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 is seeking a Senior C# Developer to support trading and trade operations applications. You will contribute to backend services in C#, frontend with ReactJS, and deployments in AWS/EKS. Emphasis on using Claude Code or GitHub Copilot to accelerate development.

The role requires strong hands-on C# experience, cloud-native skills, and a collaborative, Agile mindset. Expect to work across backend and frontend layers, with a focus on scalable, reliable deliveries.

Qualifications

• Degree in Computer Science/Information Technology or related field.
• Minimum 8 years of development experience.
• Experience with Claude Code, GitHub Copilot or similar agentic coding tools.
• Proficiency in C#, AWS, EKS and containerized deployments.
• Strong analytical, problem-solving and troubleshooting skills.
• Knowledge of UI/ReactJS development.

Responsibilities

• Develop, enhance, and maintain trading and trade operations applications.
• Design backend components using C#.
• Build and support AWS-based applications.
• Work with Amazon EKS and containerized deployments for scalable systems.
• Develop frontend/UI with ReactJS.
• Troubleshoot issues and resolve technical problems.
• Collaborate with business and technical teams on enhancements.
• Participate in Agile development activities and releases.
• Follow best practices for code quality and maintainability.

Skills

C#

ReactJS

UI development

Agile methods

Education

Bachelor's degree in Computer Science/Information Technology or related fields

Tools

Claude Code

GitHub Copilot

AWS

Amazon EKS

Containerized environments

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.