Find your next window for stargazing. Cloud forecasts, twilight, moonlight, and observing conditions in one hourly view.
Explore Dark Sky Clockbytenik.com · Software by David Pfeffer
Useful software.
Thoughtfully built.
I’m an engineering leader, former startup CTO, and hands-on software builder. ByteNik is where I share the apps I’m creating and the work behind them.
What I’m building
Apps for the world outside the screen.
Garden Eye
In developmentExplore how sunlight reaches your garden. Scan the surrounding sky to estimate sun exposure through the seasons.
About Garden EyeA broader body of work
Selected work from my career.
Research and trading platforms
Engineering leadership and hands-on architecture at THINKalpha, spanning real-time trading and distributed systems.
From idea to working product
Co-founded Ball Street Trading and FunnelFire, building consumer applications and real-time business software.
Making difficult ideas clear
Former adjunct professor at Stevens Institute of Technology, teaching programming, systems, and quantitative finance.
The person behind ByteNik
Hi, I’m David.
I’ve spent more than 20 years building software, leading engineering teams, and turning complex technical problems into working products. My experience spans fintech, distributed systems, consumer apps, and connected devices.
My independent apps sit alongside a broader body of professional work. You can find my background and resume here, along with selected projects on GitHub.