OpenLoop

Position Title: Senior Full Stack .NET Developer (Azure, Angular/React)
Location: Manhattan, NY
Position Status: Contract

Position Description

We are seeking a highly skilled Senior Full Stack .NET Developer to design, build, and support modern, scalable web applications in a cloud-first environment. This role is ideal for a hands-on technologist who thrives in Azure-based ecosystems, enjoys collaborating with cross-functional teams, and can balance application development with light project leadership responsibilities.

The ideal candidate brings strong expertise in C#, .NET Core, Web APIs, modern JavaScript frameworks (Angular or React), Azure cloud services, and DevOps best practices. You will play a key role in delivering secure, high-quality enterprise applications while contributing to technical decisions and continuous improvement initiatives.

Key Responsibilities

Application Development

Design, develop, and maintain scalable web applications using C#, .NET Core, ASP.NET MVC, and Web API.

Build responsive, user-friendly front-end interfaces using Angular or React, along with HTML5, CSS3, JavaScript, and TypeScript.

Participate in architecture discussions and contribute to technical solution design.

Cloud Integration & DevOps

Deploy, configure, and support applications on Microsoft Azure, including Azure App Services, Azure SQL, and related services.

Implement and maintain CI/CD pipelines to support automated builds, testing, and deployments using Azure DevOps or similar tools.

Support cloud optimization, monitoring, and performance improvements.

Project Delivery & Collaboration

Lead or contribute to small-to-medium application initiatives, ensuring milestones, timelines, and scope are effectively managed.

Use tools such as Azure DevOps Boards, JIRA, or MS Project for task tracking, sprint planning, and reporting.

Collaborate closely with developers, business stakeholders, and technical partners to deliver aligned, high-impact solutions.

Database & API Development

Design, develop, and optimize relational databases using SQL Server and Azure SQL.

Develop and consume RESTful APIs, including integration with third-party systems and services.

Quality, Security & Best Practices

Conduct code reviews and enforce coding standards, design patterns, and best practices.

Implement appropriate security controls and follow cloud and application security best practices.

Support ongoing application maintenance, enhancements, and performance tuning.

Required Skills / Education

Strong hands-on experience with C#, .NET Core, ASP.NET MVC, and Web API.

Experience building front-end applications using Angular or React.

Proven experience deploying and supporting applications in Microsoft Azure.

Solid understanding of CI/CD pipelines and DevOps practices.

Strong experience with SQL Server, relational database design, and performance optimization.

Experience using Azure DevOps, JIRA, or MS Project for project tracking.

Excellent collaboration, communication, and documentation skills.

Ability to work effectively in cross-functional, agile teams.

Preferred / Nice-to-Have Experience

Hands-on experience with Azure DevOps Boards and release management.

Knowledge of cloud security best practices.

Experience integrating third-party APIs and services.

Background in enterprise-scale application development.

Ability to balance hands-on development with project coordination or technical leadership.

About Seneca Resources

At Seneca Resources, we are more than just a staffing and consulting firm—we are a trusted career partner. With offices across the U.S. and clients ranging from Fortune 500 companies to government organizations, we provide opportunities that help professionals grow their careers while making an impact.

When you work with Seneca, you’re choosing a company that invests in your success, celebrates your achievements, and connects you to meaningful work with leading organizations nationwide. Our consultants and contractors enjoy competitive pay, comprehensive health, dental, and vision coverage, 401(k) retirement plans, and the support of a dedicated team that advocates for you every step of the way.

Seneca Resources is proud to be an Equal Opportunity Employer, committed to fostering a diverse and inclusive workplace where all qualified individuals are encouraged to apply.