Open to opportunities

cillian y ryan User

@cillianyryanuser

Senior full-stack engineer and architect delivering high-throughput, cloud-native web platforms with measurable performance gains.

Ireland

Message

What I'm looking for

I’m looking to lead cloud-native full-stack initiatives—owning architecture, microservices, and performance—while collaborating with teams that value clean engineering, testing, and measurable outcomes on real customer platforms.

I’m a highly experienced Senior Full Stack Developer with over 8 years designing and deploying robust web applications. I excel at leading engineering initiatives, architecting complex technical solutions, and implementing best practices across the software development lifecycle.

In my current Principal Software Engineer-Architect role at Fabric Health, I’ve architected a high-throughput data processing platform handling 10,000+ events per second with sub-millisecond latency. I built cloud-native microservices using Python (FastAPI, AsyncIO) and Node.js, deployed on Kubernetes with Istio, and integrated machine learning via AWS SageMaker—reducing data processing latency by 60%.

I also drive reliability and delivery: multi-cloud disaster recovery across AWS and Azure delivering 99.999% uptime, plus modern front-end and mobile experiences with React, Next.js, TailwindCSS, and React Native. Across my roles, I emphasize quality through testing (Jest, react-test-renderer, Cypress E2E) and engineering rigor, from GraphQL APIs to caching, infrastructure automation, and clean, review-driven collaboration.

Experience

Work history, roles, and key accomplishments

Principal Software Engineer

Fabric Health

Jan 2023 - Mar 2026 (3 years 2 months)

Architected and implemented a high-throughput data processing platform handling 10,000+ events per second with sub-millisecond latency. Built Python (FastAPI/AsyncIO) and Node.js microservices on Kubernetes/Istio, integrated AWS SageMaker to reduce data processing latency by 60%, and led multi-cloud disaster recovery achieving 99.999% system uptime.

Python fastAPI Kubernetes Istio AWS Sagemaker Microservices Azure React React Native Cypress

Senior Full Stack Engineer

Konnektable Technologies Ltd

Aug 2021 - Dec 2022 (1 year 4 months)

Architected and implemented an omn-channel customer engagement platform integrating multiple CRM, ERP, and marketing automation systems. Designed mobile-first React micro-frontend architecture (Webpack Module Federation) and GraphQL APIs (NestJS) with Python (Django REST Framework), improving data access using Redis/CDN caching and PostgreSQL sharding while automating infrastructure with Terraform

React Webpack Module Federation GraphQL NestJS Django REST Framework Redis CDN PostgreSQL Terraform Jenkins

Full Stack Developer

Reiteach

Jun 2019 - Jul 2021 (2 years 1 month)

Developed scalable RESTful APIs and data integration solutions using PHP (Laravel) and Python (Django), and built interactive dashboards and visualization tools with Vue.js and D3.js. Improved development workflows by adopting Docker and reduced production defects by implementing unit, integration, and end-to-end testing.

PHP Laravel Django REST APIs Vue.Js D3.Js Docker MySQL PostgreSQL End To End Testing

Junior Software Engineer

TablePath

Sep 2017 - May 2019 (1 year 8 months)

Contributed to the development of a SaaS platform focused on backend APIs and frontend integrations. Used Angular with NgRx and RxJS for efficient state management, implemented features and bug fixes, and supported database schema design and SQL query optimization with Git-based workflows.