Senior Software Engineer - C# / .Net Core [T500-20224]

About Costco Wholesale

Costco Wholesale is a multi-billion-dollar global retailer with warehouse club operations in fourteen countries. They provide a wide selection of quality merchandise, plus the convenience of specialty departments and exclusive member services, all designed to make shopping a pleasurable treasure hunt experience for their members.

About Costco Wholesale India

At Costco Wholesale India, we foster a collaborative space, working to support Costco Wholesale in developing innovative solutions that improve members’ experiences and make employees’ jobs easier. Our employees play a key role in driving and delivering innovation to establish IT as a core competitive advantage for Costco Wholesale.


Position Title: Sr. Software Engineer

Role Summary:

The Costco GDX Order Management Platform team is looking for a talented individual to design, develop, and maintain the critical services that power Costco’s multi-billion dollar eCommerce business.

This role will be a technical leader in a fast-paced, dynamic environment, focusing heavily on back-end microservices development with an opportunity to make a tangible impact on millions of members globally within a rapidly expanding eCommerce landscape.


This role will have direct responsibility for:

  • Delivering innovative capabilities that enhance the member experience across various digital touchpoints.
  • Building microservice components from the ground up.
  • Ensuring the longevity, scalability and quality of our systems through continuous improvement, comprehensive documentation, meticulous profiling, and significant performance enhancements.
  • Mentoring a team of engineers, fostering a culture of continuous learning and improvement.


Job Description:

Roles & Responsibilities:

  • Accountable for Order Management Platform’s overall architecture, strategically applying principles that promote availability, reusability, interoperability, and security within the design framework.
  • Establishes and maintains engineering best practices to deliver higher quality, scalable solutions.
  • Mentors and develops software engineers by providing guidance, coaching, and fostering a culture of continuous learning.
  • Establishes and maintains coding standards, architectural patterns, and development processes.
  • Works cross-functionally to pilot innovative technologies and capabilities that enhance overall member experience and drive business operational efficiencies.
  • Performs development, optimization, and automation activities to support the implementation of the Order Management platform.
  • Uses test-driven development practices to assist with the detection of software defects early in the development process.
  • Accountable for defining specifications and documentation across all phases of the product development cycle, from design to implementation.
  • Works with the product team on defining the product strategy and roadmap.
  • Estimates, plans, and manages all implementation tasks and reports on progress.
  • Regular and reliable workplace attendance at your assigned location.


Experience Required:

Minimum Qualifications:

  • 12+ years of experience
  • 10+ years of experience with C#, TypeScript, REST, JSON, XML, YAML, Microservices, Rest API and OpenAPI.
  • 10+ years of hands-on experience in architecting, designing and developing containerized (Dockers/Kubernetes) services based on the .Net Core framework.
  • 10+ years of experience developing and writing unit tests using NUnit or similar framework.
  • 5+ years of experience leading development with engineers in multiple geographical locations and time zones
  • 5+ years of experience working on building scalable cloud native architecture
  • 5+ years of experience with CI/CD tools: GitHub, Jenkins.
  • 10+ years of experience with API development, with an emphasis on security and performance.
  • 5+ experience with microservice-based debugging and performance testing software.
  • 10+ years of experience developing within an agile methodology.
  • Solid knowledge of database application development in relational and no-SQL platforms.
  • Strong verbal and written communication skills and be able to communicate to both technical and Business audiences.
  • Possesses strong leadership and interpersonal communication skills, effectively conveying product vision and influencing a wide range of stakeholders across the organization.
  • Ability to work under pressure in crisis with a strong sense of urgency.
  • Responsible, conscientious, organized, self-motivated and able to work with limited supervision.
  • Detail-oriented and possess strong problem-solving skills and ability to analyze potential future issues.
  • Able to support off-hours work as required, including weekends, holidays, and 24/7 on call responsibilities on a rotational basis.
  • Bachelor's degree in computer science, Engineering, or a related field.
  • Preferred Qualifications:
  • Experience in a retail eCommerce environment and GraphQL.
  • Experience with data modeling and object-oriented design.
  • Knowledge of SOX, PII, PCI, CCPA, and HIPAA regulations.
  • Experience deploying and configuring Google Cloud Platform resources (GKE, Pub / Sub, Spanner, BigQuery).
  • Experience with Redis or similar technologies.


Must Have Skills:

  • C# OR .NET Core
  • CI/CD OR Jenkins OR GitHub Actions
  • Cloud: AWS OR GCP OR Azure
  • NUnit in Unit Testing is required.
  • Dockers OR Kubernetes
  • SQL Server OR Spanner OR PostgreSQL


Nice to Have Skills:

  • Experience working in a retail ecommerce environment.
  • Terraform OR Ansible
  • TypeScript OR Angular OR React
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