Senior Full Stack Developer

CALPION - JOB DESCRIPTION

Senior Full-Stack Developer (React + Node.js)

THE ROLE

We're seeking a Senior Full-Stack Developer (8+ Years) to lead the design and implementation of four independent React SPAs (Single Page Applications) backed by Node.js microservices. You'll work alongside our AWS Solutions Architect to modernize a legacy Salesforce-based system while maintaining HIPAA compliance and zero downtime for active providers.

REQUIRED QUALIFICATIONS

Experience & Track Record

• 5+ years building production React applications
• 5+ years building production Node.js applications (Express or similar)
• 3+ years working with PostgreSQL or similar relational databases
• 2+ years AWS cloud services (EC2, ECS, RDS, S3, IAM, CloudWatch)
• 2+ years leading or mentoring other developers
• Proven ability to ship features end-to-end (design deployment)
• Experience migrating legacy systems to modern architectures

Technical Skills Required

Frontend:

• React (functional components, hooks, context API, suspense)
• TypeScript (strict mode, generics, utility types)
• State management (Redux, Zustand, TanStack Query, or similar)
• CSS/styling (styled-components, Tailwind, CSS modules)
• REST API integration and error handling
• Testing frameworks (Jest, React Testing Library)
• Git workflows and GitHub

Backend:

• Node.js runtime and async/await patterns
• Express.js or Fastify
• PostgreSQL (schema design, query optimization, migrations)
• Redis (caching, sessions, pub/sub)
• RESTful API design and versioning
• Database transactions and data integrity
• Authentication/authorization patterns (JWT, OAuth)

DevOps:

• Docker (containerization, multi-stage builds)
• CI/CD pipelines (GitHub Actions, GitLab CI, or similar)
• AWS services: ECS, RDS, S3, CloudFront, IAM
• Environment management (dev, staging, production)
• Monitoring and logging basics

Software Engineering:

• System design and scalability thinking
• Code review and architectural feedback
• Testing strategies (unit, integration, E2E)
• Performance optimization (frontend and backend)
• Security best practices (input validation, SQL injection prevention, secure headers)

PREFERRED QUALIFICATIONS

• Healthcare/HIPAA experience Previous work on HIPAA-compliant systems
• Salesforce integration Experience with Salesforce REST APIs, OAuth, JWT
• GraphQL Query language experience (not required, but valuable for flexibility)
• Microservices architecture Built or worked with microservices systems
• AWS Advanced – Lambda, SNS/SQS, Cognito, API Gateway
• Data-heavy applications – Built systems handling 100M+ records, complex reporting
• Claims processing – Understanding of healthcare billing, claims workflows, RCM
• ABA therapy domain – Knowledge of autism therapy, therapy management, insurance billing
• Distributed team experience – Worked across US/India time zones, asynchronous collaboration

TECHNICAL STACK

• Frontend: React 18+, TypeScript, Tailwind CSS, TanStack Query, Redux/Zustand
• Backend: Node.js, Express.js, PostgreSQL, Redis
• Cloud: AWS (ECS/Fargate, RDS, S3, CloudFront, CloudWatch, SNS/SQS)
• DevOps: Docker, GitHub Actions, Terraform/CloudFormation (nice-to-have)
• Tools & Monitoring: Datadog/CloudWatch, Sentry, GitHub, Jira
• Databases: PostgreSQL (primary), Redis (caching)