Stat.io is. UK-based data aggregation / location intelligence startup. Aggregating, standardizing and visualizing all public socio-economic data sources onto one platform. Do get in touch if interested. All info on this brief: [pdf] http://stat.io/jobs/SoftwareDeveloper.pdf
I am sure everyone knows about the Monster, Dice, Glass Door, etc. job boards BUT I strongly recommend using the "Startuply" job board visit http://startuply.com/ -- This is an excellent job board that solely focuses on the openings at Tech Startup companies.
@cdt5058, Yes the search functionality isn't that great but at least they have done wonderful job of curating the jobs in tech startups. Also, I personally use the "Browse by..." panel on the left. The "Shhh..." is popular for most of them as these startups don't want to share their initial VC investment.