Senior Backend API Developer (AWS, .NET, Kubernetes)

Company: Experis
Location: Seattle
Posted on: June 4, 2025

Job Description:

Job Title: Senior Application Developer
Location: Seattle WA - Onsite 3 days a week
Duration: 12 Months
Pay Rate: $80.00/hr W2 Job Description: We are seeking a Senior Application Developer to design, develop, and maintain high-performing applications. The ideal candidate will have extensive experience in C#, ASP.NET, Web API, and .NET Core, along with hands-on expertise in cloud-based development, preferably Azure. This role requires strong problem-solving skills, the ability to work in a fast-paced environment, and a passion for building scalable, high-quality applications. Key Responsibilities:

• Design, develop, and implement robust application solutions using C#, ASP.NET, Web API, and .NET Core.
• Develop, deploy, and maintain applications on major cloud platforms (Azure preferred, AWS, or GCP).
• Work with relational and NoSQL databases to ensure efficient data storage and retrieval.
• Take ownership of application features, ensuring timely and high-quality delivery.
• Collaborate with cross-functional teams to define application requirements and system architecture.
• Implement best practices for performance, security, and scalability in application development. Required Qualifications:
  • 10+ years of experience in application development using C#, ASP.NET, and Web API.
  • AWS or Azure experience with DynamoDB, Lambda, API Gateway, SNS, SQS, EC2 and other AWS Services, Kubernetes . 7+ years
  • 2+ years of hands-on experience with .NET Core.
  • 2+ years of experience developing cloud-based applications (Azure preferred, AWS, or GCP).
  • 5+ years of experience working with relational and NoSQL databases.
  • Strong analytical, problem-solving, and organizational skills.
  • Excellent communication and interpersonal skills.
  • Bachelor's degree in Computer Science or a related field, or equivalent experience. Preferred Qualifications:
    • 3+ years of experience working with Azure, including Cosmos DB, App Services, Azure Functions, Azure Service Bus, and Event Hub.
    • Experience designing and implementing large-scale distributed systems and service-oriented architectures.
    • Strong expertise in migrating monolithic applications to cloud-based microservices.
    • 2+ years of experience in CI/CD automation, infrastructure management, and monitoring.
    • Experience supporting applications in a 24x7 production environment.
    • Exposure to Go is a plus.
    • Passion for quality, attention to detail, and a proactive approach to innovation. Key Skills:
      • Strong collaboration and teamwork abilities.
      • Ability to prioritize tasks effectively in a fast-paced environment.
      • Excellent written and verbal communication skills.
      • Ability to quickly learn and adapt to new technologies.
      • Strong problem-solving and troubleshooting skills. If you're a results-driven developer passionate about building high-quality applications and driving innovation, we'd love to hear from you!

Keywords: Experis, Federal Way , Senior Backend API Developer (AWS, .NET, Kubernetes), IT / Software / Systems , Seattle, Washington