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Senior Full Stack Engineer with 10+ years of experience building secure, scalable healthcare and AI-driven web applications. I focus on turning complex clinical workflows into dependable products by pairing polished React interfaces with reliable server-side logic. I enjoy product-minded problem solving—shipping full-stack features that hold up in production, scale with confidence, and reduce friction for clinicians and healthcare teams every day.…Senior Full Stack Engineer with 10+ years of experience building secure, scalable healthcare and AI-driven web applications. I focus on turning complex clinical workflows into dependable products by pairing polished React interfaces with reliable server-side logic. I enjoy product-minded problem solving—shipping full-stack features that hold up in production, scale with confidence, and reduce friction for clinicians and healthcare teams every day.

Rolly Sebastian

Full Stack Developer, Back-End Developer, Front-End Developer, +2

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Senior Full Stack Engineer with 10+ years of experience building secure, scalable healthcare and AI-driven web applications. I focus on turning complex clinical workflows into dependable products by pairing polished React interfaces with reliable server-side logic. I enjoy product-minded problem solving—shipping full-stack features that hold up in production, scale with confidence, and reduce friction for clinicians and healthcare teams every day.…Senior Full Stack Engineer with 10+ years of experience building secure, scalable healthcare and AI-driven web applications. I focus on turning complex clinical workflows into dependable products by pairing polished React interfaces with reliable server-side logic. I enjoy product-minded problem solving—shipping full-stack features that hold up in production, scale with confidence, and reduce friction for clinicians and healthcare teams every day.

Available to hire

Senior Full Stack Engineer with 10+ years of experience building secure, scalable healthcare and AI-driven web applications. I focus on turning complex clinical workflows into dependable products by pairing polished React interfaces with reliable server-side logic.

I enjoy product-minded problem solving—shipping full-stack features that hold up in production, scale with confidence, and reduce friction for clinicians and healthcare teams every day.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Advanced

Work Experience

Senior Software Engineer at Ambience Healthcare

July 1, 2024 - Present

Owned React/TypeScript encounter review and documentation flows across 100+ specialties, collaborating with product managers and clinical advisors to ship usable UI. Led a React component library and API contract architecture to reduce duplicate frontend work and stabilize cross-team releases. Drove Next.js SSR and query caching to keep encounter load times stable during peak hospital usage. Architected Node.js (NestJS) and GraphQL services for chart data and real-time workflows, enforcing HIPAA controls across API and UI boundaries. Integrated EHR systems (Epic, Cerner, athenahealth) and built Python (FastAPI) services for EHR data processing behind the React/Node.js stack. Mentored engineers and participated in incident response on AWS and GCP deployments.

Senior Full Stack Developer at Collectly

March 1, 2021 - June 1, 2024

Led React/TypeScript patient billing portals and provider dashboards from US operator requirements through production rollout across growing provider networks. Designed Node.js (Express) backend-for-frontend and service layers separating billing, eligibility, and payment domains as transaction volume grew 3x. Built asynchronous reconciliation pipelines using Node.js workers, Redis, and PostgreSQL to process 5M+ monthly billing events with idempotency for volume spikes. Owned GitHub Actions CI/CD and test standards (Jest, React Testing Library) across the React and Node.js codebase. Connected Cerner, athenahealth, and Change Healthcare via Python (FastAPI/Flask) services and managed scope when facility requirements conflicted.

Full Stack Developer at Doctor Anywhere

September 1, 2018 - February 1, 2021

Shipped React teleconsultation, prescription, and provider dashboard features across six Southeast Asian markets, coordinating with Flutter mobile and QA on shared Node.js API contracts. When video consult demand spiked, traced bottlenecks across React WebRTC interfaces and Node.js session orchestration to improve reliability under load. Built Node.js microservices for appointments, records, and pharmacy distribution with OAuth2/JWT PHI access controls (500K+ monthly API requests). Developed Python (Django) services for reporting, exports, and third-party connectors to keep admin tooling off the main React patient paths. Provided production support on AWS/GCP and partnered on rollout and rollback procedures.

Web Developer at Global BrainForce

July 1, 2016 - August 1, 2018

Delivered React patient portals and Node.js (Express) admin dashboards for US healthcare clients in regulated environments with 100K+ monthly active users. On greenfield SaaS projects, defined PostgreSQL schemas, Node.js REST APIs, and modular React frontend structure before feature teams scaled up. Built Python (Django/Flask) data pipelines and admin modules alongside the primary React/Node.js stack. Introduced Jest and Supertest across React and Node.js codebases to reduce production surprises. Collaborated daily with US and Australian product owners in agile delivery cycles across time zones.