Calpion - Senior Full Stack Developer - React.js/Node.js

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 architecturesTechnical 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 GitHubBackend : - 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 basicsSoftware 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)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) (ref: hirist.tech)