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 we 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 us what you need. We'll work with you to scope, design, and deliver solutions that solve real problems — reliably and creatively.
Contact Us30+ years in software · Microsoft · IBM · MEDCOM · Founded 2010 · Vashon Island