Senior Multi-Tenant .NET Backend & Integration Engineer

Job Overview:
Pay Range: $66.06hr - $79.13hr Requirement/Must Have:
Expert-level C#, .NET Core. Deep hands-on experience with Amazon DynamoDB, PostgreSQL (Entity Framework Core or Dapper). Experience writing abstract data access layers to query heterogeneous external data sources. Real-world experience implementing application-level tenant isolation, data partitioning, and tenant context middleware. Solid conceptual understanding of VPCs, AWS Private Link, and firewalls to effectively guide networking peers. Basic familiarity with cloud infrastructure deployment (Terraform, AWS CDK) to streamline pipeline integrations.

Responsibilities:
Design, code, and optimize secure multi-tenant APIs using C# and .NET Core that dynamically query and aggregate data across Amazon DynamoDB, PostgreSQL, and varied external client data sources. Provide clear architectural requirements to Dev Ops and Network Engineering teams regarding application infrastructure needs. Collaborate with network and infrastructure peers to validate secure backend connections to external client data centers. Diagnose, isolate, and debug end-to-end data routing issues between the AWS-hosted API and remote external databases.

Skills:

C#. .NET Core. Amazon DynamoDB. PostgreSQL. Entity Framework Core. Dapper. SaaS Multi-Tenancy. VPCs. AWS Private Link. Terraform. AWS CDK. Qualification And

Education:

5+ years of active, hands-on backend development building distributed systems on AWS. Strong verbal and written communication skills. Excellent communication and presentation skills. Ability to communicate effectively with stakeholders. Benefits:
Our Benefits Include:
Medical, Dental, and Vision Insurance 401(k) Retirement Plan Health Savings Account (HSA) Disability Insurance (Short-Term and Long-Term) Life and AD&D Insurance Paid Sick Leave (where required by applicable state or local law) Supplemental Insurance Plans Identity Theft Protection Pet Insurance Employee Wellness Programs Employee Assistance Program (EAP) Career Growth and Professional Development Opportunities

Disclaimer: Benefits eligibility, accrual rates, and usage limits may vary based on employment status, length of service, and work location. Paid Sick Leave is provided in strict accordance with applicable state and municipal mandates. Cynet Systems Inc. reserves the right to modify, amend, or terminate any benefit plans at any time in accordance with applicable laws. About Cynet Systems Founded in 2010 and headquartered in the Washington, DC metro area, Cynet Systems Inc.

is a leading technology staffing and workforce solutions company serving Fortune 500 companies, government agencies, and enterprise organizations across the United States and Canada. We deliver agile, scalable talent solutions across IT, engineering, life sciences, clinical, and professional staffing, powered by a high-performing recruitment engine operating across North America and Asia. As a nationally and locally certified Minority Business Enterprise (MBE), Cynet Systems is committed to helping organizations build high-performing teams while empowering professionals to grow rewarding careers.

Our organization is certified to ISO 9001, ISO 14001, ISO 27001, and SOC 2 Type II standards, reflecting our commitment to quality, security, operational excellence, and customer success.