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# Application Developer

- **Company:** Wintrio Llc
- **Location:** Suitland-Silver Hill, MD, United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** ASP.NET, HTML, JavaScript (Programming Language), Component-Based Software Engineering, Application Integration Architecture, Unit Testing, C Sharp (Programming Language), Configuration Management, Adobe Coldfusion, Code Review, Databases, System Configuration, Data Retrieval, Database Queries, JSON, Microsoft SQL Server, Regression Testing, Secure Coding, SQL Databases, Systems Integration, Web Applications, Extensible Markup Language (XML), Delivery Pipeline, Backend, Information Technology, Front End Software Development, Software Version Control
- **Published:** October 26, 2026
- **Apply:** https://www.wintrio.com/careers/senior-application-developer/

## About the Role

* Demonstrated experience developing and maintaining production web applications and database-backed services.
 * Strong Microsoft SQL Server skills.
 * Experience with C#/ASP.NET or Adobe ColdFusion.
 * Proficiency in JavaScript, HTML, and CSS.
 * Experience developing or integrating APIs and handling JSON, XML, and CSV data.
 * Ability to troubleshoot application code, database queries, and web-server configurations.
 * Experience with version control, testing, and controlled software releases.

Preferred Experience

 * Experience supporting applications or IT projects in the economic and statistical analysis domain, particularly systems used to collect, process, validate, analyze, and disseminate economic statistics.

## Description

WINTrio seeks a Senior Application Developer to maintain and modernize business-critical web applications and data services. The environment includes interactive data tables, public APIs, online ordering and payment integrations, administrative interfaces, and historical data applications., * Develop, enhance, troubleshoot, and maintain frontend and backend application components.

 * Resolve production defects, remediate security vulnerabilities, and improve performance.
 * Integrate new datasets and enhance data retrieval, presentation, and exchange.
 * Modernize legacy code and support application migration to updated server environments.
 * Develop administrative interfaces, dashboards, and application metrics.
 * Maintain shopping-cart workflows and payment-service integrations.
 * Develop and optimize SQL queries and database interactions.
 * Perform code reviews, unit and integration testing, regression testing, and deployment verification.
 * Maintain source code, build pipelines, release procedures, and technical documentation.
 * Apply secure development, accessibility, and configuration management practices., This role provides hands-on experience supporting a long-term Federal Government digital modernization program using Salesforce, modern web technologies, accessibility standards, analytics platforms, and cloud-based development practices.