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Full Stack Developer

Full Stack Developer

Spearhead StaffingUniondale, NY, US
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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.

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    Stack Developer • Uniondale, NY, US