Senior Software Engineer Backend (NYC)

We partner with MSK provider groups and specialty clinics to help them grow, operate more efficiently, and deliver better longitudinal care across patient acquisition, clinical workflows, and ongoing patient engagement. Our platform sits at the intersection of care delivery and clinic operations, helping providers capture more value across the full patient lifecycle.

We’ve recently raised our Series B and are entering our next phase of growth.

• Design, build, and maintain backend services and web applications

• Work on real-time web applications for audio and SMS communications with users (patients)

• Implement and operate fault-tolerant, long-running workflows for asynchronous and background processing

• Collaborate with frontend, product, and infrastructure teams to deliver reliable, compliant systems

Required Qualifications:

• Proven experience building highly available backend applications in a regulated environment (e.g., healthcare, finance, compliance-driven SaaS)

• Proficiency in TypeScript and/or Python for backend service development

• Experience interacting with backend APIs built using Node.js, Express, Mongoose, Twilio or similar frameworks

• Experience with Temporal or similar distributed workflow orchestration systems (e.g., Cadence, AWS Step Functions, Conductor)

• Solid understanding of distributed systems fundamentals, including retries, idempotency, and failure handling

Preferred Qualifications:

• Experience in healthcare technology or SaaS platforms at a medium-sized startup

• Familiarity with HL7, FHIR, or EHR integrations

• Experience with cloud platforms such as AWS, Azure, or GCP

• Hands-on experience with CI/CD pipelines, infrastructure automation, and version control systems (e.g., Git)

• Experience working in a monorepo setup (e.g., Turborepo, Nx)

• Experience with distributed data or batch processing frameworks (e.g., Apache Spark, Databricks, or similar)

• Exposure to DevOps practices, including containerization, observability, and deployment automation

• Distributed remote team with hybrid offices in NYC and Vancouver.

• Hybrid. Regular and consistent on-site presence is required for this position.

• We have video on for our weekly team syncs and pair-coding/tech discussions. Camera is required to be on during meetings.

This is what you can expect of your teammates at Flagler:

• Owner: We own our work like founders. We don't wait to be asked, and we pick up the problem nobody else has.

• Builder: We like making things from scratch. We don't need a playbook to start, and we'd rather ship a rough first version than wait on a perfect spec.

• Fast: We make quick decisions. We favor progress and respect process.

• Transparent: We communicate directly. We value merit and honesty, and we challenge assumptions, including our own.

• Curious: We explore new approaches and ask "why" often.