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cillian ryan

@cillianryan

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Senior Full Stack Developer architecting high-performance, cloud-native applications.

Ireland

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What I'm looking for

I’m looking to lead and architect cloud-native products end-to-end—building scalable microservices, mobile and web experiences, and reliable delivery with strong testing, observability, and best practices.

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

In recent roles, I architected a high-throughput data processing platform (10,000 events per second, sub-millisecond latency) using Python FastAPI, AsyncIO, Node.js, Kubernetes, and Istio, and integrated ML via AWS SageMaker to reduce latency by 60%. I also drive multi-cloud disaster recovery strategies across AWS and Azure (99.999% uptime), build mobile and web experiences with React/Next.js and React Native, and lead engineering quality through unit and end-to-end testing with Jest and Cypress.

Experience

Work history, roles, and key accomplishments

Principal Software Engineer

Fabrc Heath

Jan 2023 - Mar 2026 (3 years 2 months)

Architected a high-throughput data processing platform handling 10,000 events/second with sub-millisecond latency, improving model-based processing performance by 60%. Led multi-cloud disaster recovery across AWS and Azure, achieving 99.999% system uptime, and delivered CMS/admin portals and mobile experiences with React and React Native.

Python fastAPI AsyncIO Kubernetes Istio AWS Sagemaker Microservices Azure React Cypress

Principal Software Engineer

Fabrcheath

Jan 2023 - Mar 2026 (3 years 2 months)

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

fastAPI AsyncIO Kubernetes Istio AWS Sagemaker AWS And Azure Disaster Recovery React Next.js React Native

Senior Full Stack Engineer

Konneka Technologies Ltd

Aug 2021 - Dec 2022 (1 year 4 months)

Architected an omni-channel customer engagement platform integrating CRM, ERP, and marketing automation systems. Built a mobile-first micro-frontend architecture and delivered GraphQL APIs using NestJS and Django REST Framework, improving data access with caching strategies and PostgreSQL sharding.

React GraphQL NestJS Django REST Framework Redis Postgres Sharding Terraform Jenkins

Senior Full Stack Engineer

Konnekabe Technologies Ltd

Aug 2021 - Dec 2022 (1 year 4 months)

Architected an omni-channel customer engagement platform integrating CRM, ERP, and marketing automation systems, and implemented a mobile-first micro-frontend architecture. Developed GraphQL APIs with Node.js (NestJS) and Python (Django REST Framework), improved data access using Redis and PostgreSQL sharding, and automated infrastructure management with Terraform and Jenkins.

React GraphQL NestJS Django REST Framework Redis Postgres Sharding Terraform Jenkins

Full Stack Developer

Reteach

Jun 2019 - Jul 2021 (2 years 1 month)

Developed scalable RESTful APIs and data integration solutions using PHP (Laravel) and Python (Django). Built Vue.js and D3.js dashboards, optimized MySQL/PostgreSQL database performance, improved development workflows with Docker, and implemented comprehensive testing (unit, integration, end-to-end) to reduce production defects.

PHP (Laravel)Python Django REST APIs Vue.Js D3.Js MySQL PostgreSQL Docker Unit Testing End To End Testing

Junior Software Engineer

Tabepath

Sep 2017 - May 2019 (1 year 8 months)

Contributed to a SaaS platform by building backend APIs and frontend integrations. Worked on Angular applications using NgRx and RxJS for state management, supported database schema design and SQL query optimization, and collaborated with Git-based workflows to implement new features and fix bugs.

Angular NgRX RxJS SQL Query Optimization Database Schema Design Git

Junior Software Engineer

Tabe Path

Sep 2017 - May 2019 (1 year 8 months)

Contributed to a SaaS platform spanning backend APIs and frontend integrations, implementing new features and resolving bugs across application modules. Used Angular with NgRx and RxJS for efficient state management, and supported database schema design and SQL query optimization in Git-based workflows.

Angular NgRX RxJS SaaS Development SQL Database Schema Design