Full Stack Developer

Spearhead Staffing; Uniondale (NY); Remote; USD 100,000 - 130,000; Full time

Job summary

A staffing agency is seeking an experienced Full Stack Developer for a remote position focused on developing a secure, HIPAA-compliant EMR SaaS platform. The ideal candidate should have over 5 years of experience with ASP.NET Core/C# and REACT, along with a strong background in API integration and Azure services. Responsibilities include leading full-stack development and collaborating throughout the software development lifecycle.

Qualifications

• 5+ years ASP.NET Core/C# building large-scale, distributed systems.
• 4+ years React with advanced state management.
• Experience integrating AI/ML into web applications.

Responsibilities

• Lead design, development, and optimization of ASP.NET Core and REACT applications.
• Drive evolution of multi-tenant architecture.
• Design and operate secure, performant RESTful APIs.

Skills

ASP.NET Core/C#

REACT

Azure App Services

API integration

Python

Education

Bachelor’s degree in Computer Science or related field

Tools

Azure Functions

GitHub

Job description

Job Description

Job Description

We are currently looking for a Full Stack Developer for our client in the NY metro area. This is for a full-time, remote position , working on a new Internal EMR Build for the organization.

This Sr. Application Developer will lead the architecture, development, and optimization of our secure, HIPAA-compliant, multi-tenant EMR SaaS platform on Microsoft Azure. The role will be a Full-Stack position helping to drive the performance of their ASP.NET CORE and REACT Applications, REST APIs for 3rd party integrations, and improving enterprise-grade security. The ideal candidate will have 5+ years working within ASP.NET Core/C#, 4+ years working within REACT, Azure App Services, and experience integrating AI/ML into Web Applications. Experience working within the Payer or Provider space would be a major plus.

Job Responsibilities:

• Full-Stack Leadership: Lead design, development, and optimization of ASP.NET Core and React applications with a focus on performance, scalability, and maintainability.
• Multitenancy: Drive evolution of multi-tenant architecture (tenant isolation, RBAC, efficient resource utilization, caching, and quotas).
• API Architecture: Design and operate secure, performant, and versioned RESTful APIs for vendor integrations; implement OAuth 2.0/OIDC, JWT, API keys, validation, idempotency, and robust error handling.
• Mentorship & Standards: Mentor junior/mid-level engineers; conduct thorough code reviews; champion documentation, testing, and continuous improvement.
• Cross-Functional Delivery: Translate complex requirements into sound technical designs; collaborate with product, solution architects, security, and DevOps through the full SDLC.
• Performance & Reliability: Diagnose and resolve issues across UI, APIs, databases, and Azure infrastructure; drive profiling, query tuning, and front-end performance.
• Agile Execution: Lead sprint planning, daily stand-ups, retrospectives, and backlog refinement; deliver predictable increments with high quality.
• Code Quality: Write clean, testable, well-documented code; enforce CI/CD quality gates and architectural guidelines.

Qualifications:

Backend/Frontend Development:

• 5+ years ASP.NET Core/C# building large-scale, distributed systems.
• Secure REST API design and governance (OAuth 2.0/OIDC, JWT, API keys), contract/version management, and API security best practices.
• Advanced SQL Server: schema design, complex stored procedures, indexing, query optimization, and performance tuning for high-volume workloads.
• 4+ years React (functional components, hooks), advanced state management (Context/Redux), and performance optimization for large apps.
• Mastery of TypeScript/ES6+, async patterns, and modular architecture.
• Strong HTML5/CSS3 and responsive design; cross-browser compatibility and accessibility (a11y).
• Proven ability to integrate complex APIs and manage client-side data flow and UX.

Azure Services:

• Azure App Service (deployment slots, scale, troubleshooting).
• Azure SQL Database (performance tiers, geo-replication, monitoring).
• Microsoft Entra ID (Azure AD) and Azure Key Vault.
• Serverless & Containers: Azure Functions, Logic Apps; AKS or Azure Container Instances.
• Observability: Azure Monitor and Application Insights (logging, tracing, metrics).

AI/Machine Learning:

• Experience integrating AI/ML into web apps via Azure Machine Learning or custom APIs.
• Understanding of data preparation and collaboration with data science under HIPAA guidelines.
• Familiarity with enterprise AI/ML concepts and use cases.
• Proficiency in Python to develop, deploy, or integrate models in Azure (AML SDK, Azure Functions).

Testing & Tooling:

• Unit testing with xUnit/NUnit; integration and end-to-end testing strategies.
• Postman and Swagger/OpenAPI for API documentation and automated testing.
• Expert-level GitHub workflows (branching, pull request reviews, GitHub Actions CI/CD).
• Front-end tooling (Vite/Webpack, npm/yarn) and build optimization

Education:

• Bachelor’s degree in Computer Science or related field.

Please note: This position is not open to 3rd party c2c agencies. No visa sponsorship provided. All applicants must have permanent US work authorization and not require sponsorship now -or- in the future.