APPLICATION DEVELOPER III

C2Q Health Solutions; New York (NY); On-site; USD 150,000 - 175,000; Full time

Job summary

C2Q Health Solutions is seeking an experienced Application Developer III to help build and scale a multi-tenant healthcare SaaS platform hosted on Microsoft Azure. The role covers the full stack, from API design and data models to frontend interfaces and AI-enabled capabilities, with a focus on data isolation and secure payor/vendor integrations.

You will mentor teammates, collaborate with product and data teams, and contribute to performance, testing, and architecture across on-site operations

Qualifications

• 7+ years building production systems with C# and ASP.NET Core.
• Strong REST API design and security: OAuth 2.0 / OpenID Connect, JWTs, API keys, validation, error handling, and versioning.

Responsibilities

• Build features end to end for a multi-tenant healthcare SaaS platform.
• Drive evolution of multi-tenant architecture with strict data isolation and access controls.
• Build secure, versioned REST APIs and implement integrations (X12 EDI, e-signature, SFTP, Graph).
• Extend workflow automation, real-time features (SignalR), and AI features on Azure OpenAI.

Skills

C#

ASP.NET Core

REST API design

SQL Server

Entity Framework Core

CQRS/MediatR

TypeScript/React

Azure

Security (OAuth2/OpenID)

Testing (xUnit/Moq)

Education

Bachelor’s degree in Computer Science or related field

Tools

GitHub Actions

Azure Service Bus

Azure Functions

Job description

Job Purpose

The Application Developer III supports the building of the organization's multi-tenant healthcare SaaS platform on Microsoft Azure. The platform serves multiple enterprise clients and supports daily operations, including member enrollment and eligibility checks, scheduling, care-coordination workflows, document management, configurable forms and assessments, letters, reporting, and team communication. The role helps ensure each tenant's data remains strictly isolated and supports secure data exchange with payers and other vendors through APIs and integrations.

Job Purpose

The Application Developer III supports the building of the organization's multi-tenant healthcare SaaS platform on Microsoft Azure. The platform serves multiple enterprise clients and supports daily operations, including member enrollment and eligibility checks, scheduling, care-coordination workflows, document management, configurable forms and assessments, letters, reporting, and team communication. The role helps ensure each tenant's data remains strictly isolated and supports secure data exchange with payers and other vendors through APIs and integrations. The position contributes across the whole stack, including APIs, databases, front-end, cloud infrastructure, and AI features, while setting technical standards for the development team. This senior full-stack development role supports the advancement of a rapidly growing healthcare platform that is in active development.

Job Responsibilities

Build features end to end. The back end is an ASP.NET Core API that uses CQRS with MediatR, FluentValidation, and EF Core. The front end is TypeScript, built with React Native for Web (Expo), Redux Toolkit, and RTK Query.

Drive the implementation and evolution of our multi-tenant architecture, with strict data isolation between tenants, strong access controls, and efficient use of resources.

Build secure, versioned REST APIs with:Microsoft Entra ID / JWT authentication

role- and capability-based access control

field-level permissions

checks that a user may access each specific record

audit logging that meets HIPAA requirements

Build and maintain integrations: X12 EDI 270/271 eligibility, e-signature, contact-center phone systems, SFTP file exchange, and Microsoft Graph. These run on Azure Service Bus, Azure Functions, and background services.

Extend the platform's workflow automation engine, which runs on events and schedules and is built on Durable Task. Work on real-time features (SignalR) for notifications, chat, and live updates.

Build AI features with Azure OpenAI, keeping PHI exposure to a minimum and a person in the loop:an assistant that can call tools

document search that answers with citations (Azure AI Search)

AI sorting of incoming documents

live speech transcription (Azure Speech) that suggests form answers for a user to accept

Design SQL Server schemas with our data team, write and tune complex queries, and fix EF Core performance problems on large tables.

Ship through GitHub Actions to Azure: container images on App Service (via Azure Container Registry), Azure Functions and Azure Static Web Apps, monitored with Application Insights.

Review code, mentor junior and mid-level developers, and raise the bar on testing (xUnit, Moq, Jest, React Testing Library), documentation and architecture.

Work closely with product owners, the data team, and other engineers in an Agile team: sprint planning, stand-ups, backlog refinement, and retrospectives.

Solve hard production problems anywhere in the stack, from slow screens and query plans to authorization failures and Azure configuration.

Schedule: 8:30AM – 5:30PM

Weekly Hours: 40

Location: On-Site, 136-65 37th Avenue, Flushing, NY 11354

Qualifications

Education:

Bachelor’s degree in Computer Science or related field.

Required Skills & Experience

Backend

7+ years building production systems with C# and ASP.NET Core, including large-scale, distributed systems.

Strong REST API design and security: OAuth 2.0 / OpenID Connect, JWTs, API keys, validation, error handling, and versioning. You know how to prevent unauthorized record access (IDOR) and leaking internal details in error messages.

Strong SQL Server skills: schema design, complex queries and stored procedures, indexing, execution plans and tuning for high data volumes.

Production experience with Entity Framework Core, including mapping to existing database-first schemas, query performance, and migrations.

Experience with clean, layered architectures: CQRS/MediatR, repository and unit-of-work patterns, dependency injection.

Frontend

5+ years with React: function components and hooks, state management with Redux Toolkit / RTK Query or similar, and performance tuning for large, data-heavy applications.

Expert TypeScript and modern JavaScript (ES6+), including async patterns.

Responsive, accessible UI built on a shared design system and utility CSS such as Tailwind.

Experience connecting complex APIs to the UI: loading, error, and permission states, real-time updates, and server-side paging, sorting, and filtering.

Azure

Hands-on experience with Azure App Service (including container deployments), Azure SQL, Azure Functions, Service Bus, Blob Storage, and Key Vault.

Microsoft Entra ID sign-in and authorization for web apps and APIs.

Monitoring and troubleshooting with Azure Monitor and Application Insights.

Familiarity with Docker and CI/CD pipelines (GitHub Actions preferred).

AI

Experience shipping LLM features in production apps, ideally on Azure OpenAI: prompt design, tool/function calling, retrieval-augmented generation (RAG), and handling model failures gracefully.

Understanding of how to handle sensitive data (PHI) safely in AI features, in line with HIPAA.

Testing & Tooling

Unit testing with xUnit (or NUnit) and Moq, and front-end testing with Jest and React Testing Library. A practical approach to integration and end-to-end testing.

Swagger/OpenAPI and API tools such as Postman.

Expert Git skills in a branch-and-pull-request workflow.

Front-end tooling such as npm/pnpm and modern bundlers (Metro, Webpack, or Vite).

Preferred Qualifications

Proven track record of building and deploying complex multi-tenant SaaS applications at scale.

React Native and Expo, especially React Native for Web; NativeWind and Gluestack UI.

Healthcare experience: HIPAA, PHI handling, Medicaid/Medicare eligibility, X12 EDI (270/271), HL7 or FHIR.

Workflow and messaging systems: Durable Task / Durable Functions, Service Bus, outbox and idempotency patterns.

Real-time applications with SignalR.

Azure AI Search, Azure AI Speech, or document-processing and PDF-generation pipelines.

Python for automation, data processing, or AI/ML work.

Experience leading Agile ceremonies or improving team processes.

Open-source contributions or active involvement in technical communities.

Soft Skills

Excellent problem-solving and debugging skills; you find the root cause, not just the symptom.

Clear written and spoken communication with both technical and non-technical people.

A natural mentor who builds a collaborative, supportive, high-performing team.

Self-motivated and always learning, including new technologies and the healthcare domain.

Able to influence technical decisions and drive best practices across the team.

Physical Requirements

Individuals must be able to sustain specific physical requirements essential to the job. This includes, but is not limited to:

Standing – Duration of up to 6 hours a day

Sitting/Stationary Positions – Sedentary position for a duration of up to 6-8 hours a day for consecutive hours/periods.

Lifting/Push/Pull – Up to 50 pounds of equipment, baggage, supplies, and other items used in the job scope using OSHA guidelines, etc.

Bending/Squatting – Have to be able to safely bend or squat to perform the essential functions under the scope of the job.

Stairs/Steps/Climbing – Must be able to maneuver stairs safely, climb up/down, and walk to access work areas.

Agility/Fine Motor Skills - Must demonstrate agility and fine motor skills to operate and activate equipment, devices, instruments, and tools to complete essential job functions (i.e., typing, use of supplies, equipment, etc.)

Sight/Visual Requirements – Must be able to read documentation, papers, orders, signs, etc., and accurately type/write documentation, etc.

Audio Hearing and Motor Skills (Language) Requirements – Must be able to listen attentively and document information from patients, community members, co-workers, clients, providers, etc., and intake information through audio processing with accuracy. In addition, one must be able to speak comfortably and clearly with language and motor skills for customers to understand an individual.

Cognitive Ability – Must be able to demonstrate good decision-making, reasonableness, cognitive ability, rational processing, and analysis to satisfy essential functions of the job.

Disclaimer

Responsibilities and tasks outlined in this job description are not exhaustive and may change as determined by the needs of the company.

We are an affirmative action and equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, disability, age, sexual orientation, gender identity, national origin, veteran status, height, weight, or genetic information. We are committed to providing access, equal opportunity, and reasonable accommodation for individuals with disabilities in employment, its services, programs, and activities.

Salary Range (Min-Max)

$150,000.00 - $175,000.00

Every application is reviewed by our recruitment team. We do not use AI to make hiring decisions or automatically reject applicants. All employment decisions are based on job-related qualifications and applicable employment laws.