Senior Backend .NET Developer

Requirements:

• 6+ years of software development experience, including strong backend development and integration work.
• Strong hands-on experience with C#, .NET/.NET Core, and ASP.NET Core.
• Strong SQL Server skills, including complex queries, stored procedures, database development, query optimization, and performance tuning.
• Hands-on experience designing and developing RESTful APIs and enterprise system integrations.
• Strong experience with ETL, data integration, and data-processing solutions, including hands-on use of Azure Data Factory (ADF) and experience with SSIS.
• Experience with Microsoft Azure and Azure-based application and data services.
• Understanding of JSON, XML, APIs, batch processing, and enterprise integration patterns.
• Experience troubleshooting and supporting production applications, integrations, and data pipelines.
• Experience with Git, Azure DevOps, and CI/CD practices.
• Mandatory healthcare insurance/payer industry experience, with an understanding of payer applications, data, and business processes.
• Strong verbal and written communication skills, including the ability to work directly with onshore business, architecture, and technical stakeholders.
• Hands-on experience with AI-assisted development tools such as Cursor or similar tools, including using AI for coding, refactoring, unit testing, debugging, code review, and technical documentation.
• Ability to quickly adopt AI-enabled SDLC processes and custom AI engineering tools, with an AI-native approach to improving development quality and productivity.

Responsibilities:

• Design, develop, enhance, and support backend applications and services using C#, .NET, and .NET Core.
• Develop and maintain RESTful APIs and integration services connecting healthcare applications, enterprise systems, and data platforms.
• Build and optimize SQL Server queries, stored procedures, database objects, and data-processing components.
• Design, develop, and maintain ETL and data integration pipelines using Azure Data Factory and SSIS.
• Create solutions for extracting, transforming, validating, reconciling, and moving data between source and target systems.
• Build and support integrations between operational applications and the Enterprise Data Hub or data platform.
• Troubleshoot application, API, database, ETL, and data-pipeline issues, and provide production support.
• Tune and optimize performance across .NET services, APIs, SQL queries, and data-integration workflows.
• Participate in solution design, code reviews, unit and integration testing, deployment, and production support.
• Partner with business analysts, architects, data engineers, QA teams, and domain SMEs to turn business and data requirements into technical solutions.
• Ensure solutions comply with established development, integration, security, and data-handling standards.
• Support AI-enabled data and application initiatives, helping prepare enterprise data for AI use cases and integrate AI-driven capabilities into applications and services.

Technologies:

• AI
• API
• ASP.NET
• Azure
• Backend
• C#
• CI/CD
• Cursor
• DevOps
• ETL
• Git
• Support
• JSON
• SQL
• Security
• SSIS
• XML
• Cloud

More

We are recruiting an experienced .NET Developer for a healthcare insurance client to help develop and modernize an enterprise data and integration platform. The role focuses on backend applications, APIs, data integrations, and ETL processes using .NET, SQL Server, Microsoft Azure, Azure Data Factory, and SSIS, in close collaboration with business, architecture, and data teams. The pay range is $45.00–$50.00 per hour. We offer medical, dental, and vision coverage; a 401(k); HSA; short- and long-term disability; life and AD&D insurance; paid sick leave where required by law; supplemental insurance; identity theft protection; pet insurance; wellness programs; an employee assistance program; and career development opportunities. Benefit eligibility and terms vary by employment status, tenure, and location, and plans may be modified in accordance with applicable law. Founded in 2010 and headquartered in the Washington, DC metro area, Cynet Systems Inc. provides technology staffing and workforce solutions to Fortune 500 companies, government agencies, and enterprises across the United States and Canada. We serve IT, engineering, life sciences, clinical, and professional staffing needs, and are a certified Minority Business Enterprise with ISO 9001, ISO 14001, ISO 27001, and SOC 2 Type II certifications.

last updated 43 week of 2026