I'm John Cornelison — software architect, Vashon islander, one-person studio.
30+ years building websites, custom software, and emergency technology. Founded in 2010, Vashon Software takes on projects of any size — from a quick site fix to a complex system architecture.
What I build
Websites, crafted software, and disaster technology — delivered with expertise across the full technology stack.
Websites
Modern low-JS, static mobile-first sites with proven 100 PageSpeed scores for Performance, Accessibility, Best Practices & SEO. Creative design, user editable — all at an economical price.
Crafted Software
Microservices-based custom applications using C#, TypeScript, Python, C++ and more. AI with Small Language Models for GIS & IoT, Secure IoT Development, and Data Analytics on modern cloud solutions.
Disaster Technology
ICS, NIMS & NRF-based solutions for Emergency Operations Centers. Resilient systems that operate independently of the cloud — but leverage it when available.
Local & One-Off Projects Welcome
Not every project needs a big agency. I work with Vashon businesses, nonprofits, and neighbors on:
- Website fixes, updates, and refreshes
- One-page sites and landing pages
- Small custom tools and automations
- Tech consulting and second opinions
- Helping you get unstuck on a project
Island rates. Quick turnaround. No overhead.
Let's TalkReady to start your project?
Tell me what you need — I'll help you scope, design, and ship something that actually solves the problem, without the corporate runaround.
Contact Me30+ years in software · Microsoft · IBM · MEDCOM · Founded 2010 · Vashon Island