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Coding
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DOS1986/README.md

David O. Southwood

Senior Full-Stack Software Engineer
React · TypeScript · C# · .NET · SQL · Azure · APIs · Internal Tools · Legacy Modernization

I’m a full-stack software engineer with 10+ years of experience building, modernizing, and maintaining enterprise web applications, internal tools, dashboards, APIs, SQL-backed workflows, and cloud-integrated systems.

Most of my professional work has been private, internal, portal-based, backend, middle-tier, or under NDA, so this GitHub focuses on public side projects, technical experiments, documentation, and demo work that reflects the kinds of systems I build professionally.

What I Work On

  • Legacy application modernization
  • React and TypeScript frontend systems
  • C#/.NET APIs and backend workflows
  • SQL Server and PostgreSQL data workflows
  • Internal tools, dashboards, and operational UIs
  • Azure Functions, Azure DevOps, CI/CD, and Docker
  • Authentication, authorization, and secure document workflows
  • Production debugging and application support
  • Geospatial and time-zone data workflows using SQL Geography
  • Developer tooling, automation, and AI-assisted development workflows

Core Stack

Languages & Frameworks
C#, .NET, JavaScript, TypeScript, React, Angular, Vue.js, Node.js, SQL

Frontend
React, TypeScript, Angular, Vue.js, AG Grid, FlexLayout, Bootstrap, jQuery, responsive design, reusable UI components

Backend / Data / Cloud
REST APIs, SQL Server, PostgreSQL, stored procedures, SQL Geography, Azure, Azure Functions, Azure DevOps, Azure Blob Storage, Azure Key Vault, CI/CD, Docker

Tools & Practices
Git, TFS, Visual Studio, VS Code, SSRS, debugging, unit testing, automated testing, documentation, production support, Agile development

Featured Work

Many of my professional projects cannot be shared publicly, so these repositories are intended to show related patterns, tooling, and development approach.

Documents Organizer

A desktop utility for organizing files by extension and modified date.

CodeKeeper

A code snippet manager focused on organizing reusable developer notes and examples.

Public Demo Projects In Progress

I’m currently building a small set of polished public demos to better reflect the private enterprise work I have done professionally.

React Admin Dashboard Demo

A recruiter-friendly React and TypeScript dashboard demo showing reusable components, data grids, filters, layout patterns, mock API data, and internal-tool style workflows.

.NET Web API Demo

A backend API demo showing C#/.NET, database integration, Swagger/OpenAPI, Docker, testing, and CI/CD patterns.

Geo Timezone Resolver Demo

A SQL-backed geospatial demo showing how latitude/longitude coordinates can be matched against timezone polygon data using SQL Server geography types and backend API logic.

This project is intended to demonstrate data ingestion, geospatial querying, SQL-backed workflows, API design, and practical backend problem solving.

Current Focus

I’m currently focused on strengthening public examples around:

  • React and TypeScript dashboard architecture
  • .NET API design
  • SQL-backed workflows
  • Data ingestion and validation
  • Geospatial lookup logic with SQL Geography
  • Testing and CI/CD
  • AI-assisted development with human review and guardrails
  • Technical writing around legacy modernization, internal tools, and production support

Links

Outside of Code

I’m also a video game collector and enjoy working on game, homelab, and personal software projects when time allows.

Popular repositories Loading

  1. DOS1986 DOS1986 Public

    1

  2. Homelab Homelab Public

    This is where I document the building and running of my homelab

    1

  3. Documents-Organizer Documents-Organizer Public

    A Python application for organizing and managing files and folders efficiently by extension and date modified.

    Python 1

  4. CodeKeeper CodeKeeper Public

    CodeKeeper is a versatile code snippet manager application built using Python and Tkinter with theming, designed to help developers organize, manage, and retrieve code snippets effortlessly.

    Python