DevOps & Software Developer

Building systems
that scale.

I'm Jack O'Shea, a developer focused on infrastructure automation, clean code, and creating reliable software that solves real problems.

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Available for new opportunities

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Selected Work

Featured Projects

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Quark - DevOps Workflow Automation Engine

A .NET CLI workflow execution engine with attribute-based plugin architecture, built for DevOps teams to automate testing, health checks, and operational tasks.

.NET 9C# 13SerilogSpectre.Console

Oscar - Data Analytics & Visualization Platform

An iOS/macOS app built with SwiftUI and The Composable Architecture for exploring, analyzing, and visualizing complex datasets with interactive filtering, geographic mapping, and AI-assisted insights.

SwiftSwiftUITCAMapKit

Spire - Secure Data Retrieval API Platform

A FastAPI-based backend platform for secure multi-source data retrieval with role-based access control, AI-powered insights, and support for PostgreSQL, S3-compatible storage, and Redis caching.

PythonFastAPIPostgreSQLRedis

K8s Deployment Pipeline

A GitOps-based Kubernetes deployment pipeline with automated testing, canary deployments, and rollback capabilities for microservices architectures.

KubernetesDockerArgoCDGitHub Actions

Cloud Infrastructure Platform

A fully automated multi-cloud infrastructure provisioning platform using Terraform, supporting AWS and Azure deployments with one-click environments.

TerraformAWSAzurePython

ExpenseFlow Mobile App

A cross-platform mobile expense tracking application built natively for iOS (Swift) and Android (Kotlin) with real-time sync and smart categorization.

SwiftKotlin.NET CorePostgreSQL

Expertise

Skills & Technologies

A curated toolkit refined through years of building production systems.

Backend

.NETC#PythonREST APIsSQLPostgreSQL

Mobile

iOSSwiftAndroidKotlinReact Native

DevOps

TerraformDockerKubernetesAWSAzureCI/CD

Tools

GitLinuxGitHub ActionsMonitoringAgileIaC

Years Experience

20+

Projects Delivered

15+

Technologies

From the Blog

Recent Writing

All Posts

Dec 20, 2024 12 min read

From Concept to Production: The Quark Journey

The story of designing and building Quark, a .NET workflow automation engine, from initial concept through production deployment. Lessons learned in architecture, documentation, and iterative development.

.NETArchitecture

Dec 18, 2024 9 min read

Type-Safe Parameter Interpolation in Workflow Engines

How to implement performant, type-safe parameter substitution with ${variable} syntax without reflection overhead, using an explicit interpolation pattern.

.NETC#

Dec 15, 2024 8 min read

Building a Plugin System with .NET Attributes

How I built a zero-configuration plugin system using .NET attributes and reflection for the Quark workflow engine, enabling true extensibility without modifying core code.

.NETC#

Nov 25, 2024 9 min read

Why I Chose Polars Over Pandas for Spire

How switching from Pandas to Polars improved performance by 5-10x in Spire's data processing API, with practical examples and benchmarks from production use.

PythonData Engineering

Let's Connect

Have a project in mind?

I'm always interested in hearing about new opportunities and collaborations. Let's discuss how we can work together.

Get in Touch jack@jackoshea.dev

Building systems that scale.