Senior .NET Developer: Modernize Apps & Data Integration

American Express Global Business Travel; Manila; On-site; PHP 1,200,000 - 1,800,000; Full time

Job summary

American Express Global Business Travel in Manila, Philippines, is seeking a senior application developer to design and develop software and web applications using .NET and C#. You will contribute to modernizing our proprietary application portfolio and support data integration initiatives.

The role requires 3+ years in C#, .NET, SQL Server, and cloud familiarity, with strong problem-solving and communication skills.

Qualifications

• Bachelor’s degree in Computer Science, Engineering, or related field, OR equivalent professional experience
• 3+ years of professional experience building applications using C# and .NET framework
• 3+ years of professional experience with SQL Server database design, development, and optimization
• Strong understanding of object-oriented programming (OOP) principles and design patterns
• Experience with web application development using ASP.NET or ASP.NET Core
• Familiarity with Azure or other cloud-based technologies
• Understanding of SDLC methodologies and best practices
• Experience with version control systems (e.g., Git)
• Strong problem‑solving and analytical skills
• Excellent written and verbal communication skills
• Ability to work independently and collaboratively with team members

Responsibilities

• Design, develop, and maintain software and web applications using .NET framework and C#
• Write clean, well-documented code adhering to established standards and best practices
• Contribute to maintenance, bug fixes, and enhancements of in-house software products
• Participate in modernizing legacy applications to contemporary Microsoft technologies
• Participate in design reviews and code reviews, providing technical input and constructive feedback
• Collaborate with team members and stakeholders to understand functional requirements and plan solutions
• Translate business requirements into technical designs and implementation strategies
• Estimate work resources accurately and communicate timelines and dependencies
• Read and translate technical specifications into reliable application logic
• Design and develop SQL Server databases, queries, and stored procedures
• Optimize database performance and ensure data integrity
• Collaborate on data modeling and schema design
• Support, maintain and enhance automated data ingestion processes
• Work with structured data formats (CSV, JSON, XML) and external file-based data feeds (FTP/SFTP)
• Implement data validation, transformation, and error-handling logic
• Troubleshoot production data issues and perform root cause analysis
• Document data integration processes and maintain technical documentation
• Analyze and identify functional and business shortcomings in existing software
• Communicate technical issues, solutions, and recommendations to team members and stakeholders
• Collaborate with cross-functional teams to identify solutions aligned with company needs
• Escalate technical challenges to your Development Manager when needed
• Stay current with latest technologies, frameworks, and security best practices
• Monitor security vulnerabilities and industry updates relevant to our technology stack
• Identify opportunities to enhance application security, performance, and maintainability
• Leverage AI-assisted development tools to enhance productivity
• Participate in team knowledge-sharing sessions

Skills

C#

ASP.NET

SQL Server

OOP principles

Git

Azure

SDLC

Communication skills

Education

Bachelor’s degree or equivalent

Tools

Visual Studio

GitHub

Azure DevOps

Job description

American Express Global Business Travel in Manila, Philippines, is seeking a senior application developer to design and develop software and web applications using .NET and C#. You will contribute to modernizing our proprietary application portfolio and support data integration initiatives.

The role requires 3+ years in C#, .NET, SQL Server, and cloud familiarity, with strong problem-solving and communication skills.