Michael Falk

Senior Full Stack Developer at TwinHealth

Built patient-facing workflows and clinician admin pages using React and TypeScript; redesigned API aggregation and caching to address slow UI states. Implemented OAuth 2.0 and OpenID Connect identity flows, aligning backend middleware with frontend token expiry to prevent intermittent logouts. Delivered RBAC with audit logging for healthcare records, stabilized data pipelines in PostgreSQL and Elasticsearch, and introduced Redis caching with idempotency keys for write endpoints. Created end-to-end coverage with Cypress and Jest, built observability with OpenTelemetry, Prometheus, and Grafana, and modernized deployments with Docker/Kubernetes and GitHub Actions. Collaborated with clinicians to map real-world care steps into UI flows and improved webhook ingestion reliability with Kafka/RabbitMQ.

Full Stack Developer at ScienceSoft

Developed appointment and billing features in React and Node.js/Express; refactored backend services with Spring Boot and Hibernate to improve domain boundaries and query performance in PostgreSQL. Implemented JWT authentication with scoped permissions and audit context; created data integrity tooling with Flyway/Liquibase migrations; integrated lab/claims feeds via webhooks and resilient consumers with Kafka/RabbitMQ. Diagnosed production issues with Sentry traces and CloudWatch logs, optimized Elasticsearch indexing, and strengthened CI quality with JUnit/Mockito and pytest. Delivered user-facing reliability improvements and collaborated with clients on rollout plans, including server-side pagination and caching for admin dashboards. Hardened security and standardized API documentation and dev setups with Docker.