Music Top 10 from 2014
Like last year and the year before, here’s the list of music I’ve listened to most as scrobbed to Last.fm. Top Artists Above & Beyond – 120 listens Tensnake – 67 listens Brika – 57 listens Chromeo...
View ArticleSwift: println isn’t NSLog
After banging my head against this the last few days, I thought I might share a little insight as I delve deeper into Swift. As tempting as it may sound to believe it, println IS NOT NSLog. If you’ve...
View ArticleMonitoring the Node.js Event Loop with InfluxDB
One of our services (our integration engine) at Luma Health has recently been encountering odd timeouts when making outbound connections to another service it depends on. The receiving service has...
View ArticleOptimizing Array Lookups in Node.js
Following up on last week’s post, one of the areas we see (saw!) our integration service running CPU hot was when it was doing the core part of it what it does: diffing the list of data we receive from...
View ArticlePerformance Implications When Comparing Types in Node.js
Like in any language that is weakly typed, you can’t avoid the fact that performing comparisons across types will cost you CPU cycles. Consider the following code which does a .filter on an array of 5M...
View ArticleOur First Five Hires at Luma Health
I was having a conversation with my father about how people at startups often say “I was employe X at such and such company”. It got me thinking who were our first few hires and what were their roles....
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Unbounded Range Queries in Mongo
In Luma Health, often times we have to do queries against collections that have 50, 60, 100M+ records — as you’d expect, well thought through queries and good indexes are the building blocks to...
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We’ve raised $16M for Luma Health’s B Round
I’m not sure I even wrote on my personal blog when we raised our A round — but here we are, about four and a half years after we founded the company, having just announced we closed our $16M B round!...
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How changing ISPs made Luma Health happier
Getting internet is maybe the first thing you do, but also perhaps the most forgettable thing you do. When we moved to our newest office early last year in downtown SF, we asked our building...
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Adventures in Async Calls and bcrypt
We use bcrypt to store passwords in Luma Health. In the NodeJS world there are two common libraries used to do this, bcryptjs, which is a pure JavaScript implementation and bcrypt, which is a wrapper...
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