Harlow – Medium

Harlow

Big poopies, little data; tracking diaper changes with IoT Button

When Miles was a newborn our pediatrician regularly asked us how many times he’s been gong potty per-day. It turns out when you’re sleep…

Nov 2, 2017

Big poopies, little data; tracking diaper changes with IoT Button

Nov 2, 2017

Processing Kinesis Streams w/ AWS Lambda and Golang

Using Kinesis Streams as a trigger for AWS Lambda has made it easier than ever to process real-time event data. The days of managing…

Jun 24, 2017

Processing Kinesis Streams w/ AWS Lambda and Golang

Jun 24, 2017

Tracing gRPC calls in Golang with Google Stackdriver

Google Cloud Platform recently released Stackdriver Trace which helps highlight and debug performance bottlenecks within our software. The…

Feb 26, 2017

Tracing gRPC calls in Golang with Google Stackdriver

Feb 26, 2017

Ruby based ETL pipeline with Iron.io and Redshift

As the data requirements of our Business Intelligence team grow we’ve been leveraging Iron.io’s IronWorker as our go-to platform for…

Jan 6, 2017

Ruby based ETL pipeline with Iron.io and Redshift

Jan 6, 2017

Interservice communication with Redis and Sidekiq remote workers

As our infrastructure continues to grow (and we continue to extract core services) we’re consistently having to sync data between…

Jan 6, 2017

Interservice communication with Redis and Sidekiq remote workers

Jan 6, 2017

How to stub external services in tests

Requests to external services during test runs can cause several issues:

Jan 5, 2017

Jan 5, 2017

NSQ service discovery with DNS records

Nsqd is typically launched with a list of IP addresses pointing to each of the nsqlookupd nodes.

Jan 24, 2016

Jan 24, 2016

gRPC metadata for Client / Server context

When we need to pass metadata between services the gRPC metadata package can be used pass key-value pairs in the context.

Aug 27, 2015

Aug 27, 2015

Email failover with MultiSMTP

Email is a critical part of our business and we rely on it heavily to deliver notifications to both our customers and Hotel partners.

May 16, 2014

May 16, 2014

Scale Rails with Varnish HTTP caching layer

An HTTP caching layer can be used to dramatically speed up requests to our web applications. We’ll walk through setting up a Ruby on Rails…

Nov 16, 2013

Scale Rails with Varnish HTTP caching layer

Nov 16, 2013

Harlow

Harlow

Nothing ventured, nothing Gained. CTO at @Clearbit. I value learning over being right. Read more at www.hward.com.

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