Senior Fullstack Developer

About Certify:

At CertifyOS, we're building the infrastructure that powers the next generation of provider data products, making healthcare more efficient, accessible, and innovative. Our platform is the ultimate source of truth for provider data, offering unparalleled ease and trust while making data easily accessible and actionable for the entire healthcare ecosystem.

What sets us apart? Our cutting-edge, API-first, UI-agnostic, end-to-end provider network management platform automates licensing, enrollment, credentialing, and network monitoring like never before. With direct integrations into hundreds of primary sources, we have an unbeatable advantage in enhancing visibility into the entire provider network management process. Plus, our team brings over 25+ years of combined experience building provider data systems at Oscar Health, and we're backed by top-tier VC firms who share our bold vision of creating a one-of-a-kind healthcare cloud that eliminates friction surrounding provider data.

But it's not just about the technology; it's about the people behind it. At Certify, we foster a meritocratic environment where every voice is heard, valued, and celebrated. We're founded on the principles of trust, transparency, and accountability, and we're not afraid to challenge the status quo at every turn. We're looking for purpose-driven individuals like you to join us on this exhilarating ride as we redefine healthcare data infrastructure.

About the role:

As a Senior Full-Stack Engineer, you'll contribute hands-on to our provider intelligence platform and products used directly by our customers and their end users. This role requires strong backend experience — candidates should have been deeply involved in backend system design, microservices architecture, and scalable API development. If you're comfortable navigating both frontend and backend, but lean toward solving hard backend problems, we'd love to speak with you.

• Develop and maintain the applications and services that make up our highly available systems
• Provide technical leadership through code reviews and mentorship for junior team members
• Reinforce coding best practices including CI/CD and writing DRY, extensible code 
• Work with sensitive information (PII) and ensure best development practices privacy and security
• Contribute to agile team ceremonies and processes (stand-ups, groomings, planning meetings)
• Help identify high value opportunity areas for the team and guide their implementation

• 4+ years of experience building and maintaining full-stack web applications using modern JavaScript frameworks (React, Redux, , NestJS, TypeScript), with demonstrable ownership of backend systems and APIs including writing and maintaining unit, integration, and end-to-end (E2E) tests.
• strong knowledge of event-driven and cloud-native architectures, including Pub/Sub, Cloud Schedulers, DAGs, and workflow orchestration.
• Embracive culture of alerting and monitoring
• Deep understanding of client-server communication patterns and backend performance tuning
• Advanced experience with version control tools (Git, SVN)
• Built and deployed applications using containers
• Strong written and verbal communication skills
• effectively document complex systems through well-structured technical documentation and architectural diagrams.

• Have experience with a microservices architecture
• Developed in environments with large amounts of data
• Experience in healthcare and working with PII
• Hands-on experience in Java and Python
• Experience working with complex datasets, including cleaning, standardizing, and transforming inconsistent or messy data into reliable, usable formats.

• NextJS and NestJS frameworks
• NodeJS and Typescript
• React and Redux
• Jest and Cypress 
• Auth0
• Git and Github
• Sentry
• Snyk
• Jira
• Slack
• Google cloud platform

At Certify, we're committed to creating an inclusive workplace where everyone feels valued and supported. As an equal opportunity employer, we celebrate diversity and warmly invite applicants from all backgrounds to join our vibrant community.