List of Tech Migrations

I'm quite fascinated with the decision (and obviously the effort) of leaving a language or database to another technology, here's the list that I found:

• Twitter (2011) from Ruby to Scala
• Urban Airship (2011) from MongoDB to PostgreSQL
• Mixpanel (2011) from Erlang to Python
• LinkedIn (2012) from Ruby to NodeJS
• MoovWeb (2012) from ? to Go
• NTP Pool (2012) from Perl to Go
• DLGoogle (2012) from C++ to Go
• Bitly (2012) from Python/C to Go
• SoundCloud (2012) from Ruby to Go
• SmartyStreets (2012) from .NET to Go
• Toggl (2012) from Ruby to Go
• Shareaholic (2012) from MongoDB to Riak
• DigiDoc (2012) from MongoDB to PostgreSQL
• Etsy (2012) from MongoDB to MySQL
• TekPub (2012) from MongoDB to PostgreSQL
• TargeterApp (2012) from NodeJS to Ruby
• PayPal (2013) from Java to NodeJS
• Koding (2013) from NodeJS to Go
• Iron.io (2013) from Ruby to Go
• Zalora (2013) from PHP to Go
• TimeHop (2013) from Ruby to Go
• Canonical Juju (2013) from Python to Go
• Instill (2014) from AngularDart to Polymer
• Workia (2014) from ActionScript to Dart
• TrustWave (2014) from ActionScript/Flex to Dart
• Facebook Chat (2014) from Erlang to C++
• Grab (2014) from Ruby/NodeJS to Go
  
• Auth0 (2015) from Apache Kafka to ZeroMQ
• Pinterest (2015) from Java to Elixir
• President University (2015) from PHP/MySQL to Go/PostgreSQL 
• UserLike (2015) from MySQL and MongoDB to PostgreSQL
• Olery (2015) from MongoDB to PostgreSQL
• CrowdStrike (2015) from Scala to Go
• DockYard (2015) from Ruby to Elixir
• CrowdStrike (2016) from Scala to Go
• Tokopedia (2016) from Perl to Go
• Uber (2016) from PostgreSQL to MySQL
• Uber (2016) from NodeJS to Go and Java
• Uber (2016) from Python to Go
• Digg (2016) from NodeJS to Go
• Google AdWords (2016) from GWT to Angular Dart
• Bleacher Report (2017) from Ruby to Elixir
• UpGuard (2017) from JRuby to Go
• Movio (2017) from Scala to Go
• Discord (2017) from MongoDB to Cassandra
• Uber (2017) Riak/Solr to Cassandra
• Swat.io (2017) from MySQL to PostgreSQL
• Poki (2017) from PHP to Go
• Stream (2017) from Python to Go
• Baidu (2017) from MySQL to CockroachDB
• Boxzilla (2017) from PHP to Go
• Shippable (2017) from MongoDB to PostgreSQL
  
• GeekyAnts (2017) from ReactNative to Google Flutter (confirmed)
• AppTree (2018) from Java/Kotlin/ObjC/Swift to Dart
• SendGrid (2018) from Perl/Python to Go
• Bukalapak (2018) from Ruby/MySQL to Go/MongoDB/ElasticSearch
• Centrifugo (2018) from Python to Go
• The Guardian (2018) from MongoDB to PostgreSQL
  
• AppsFlyer (2019) from Clojure to Go
• Deliveroo (2019) from Ruby to Rust
• Amazon (2019) from OracleDB to Aurora Postgres and DynamoDB
• Two Fintech Giants (2019) from OracleDB to CockroachDB 
• Comcast (2019) from Cassandra to ScyllaDB
  
• Codism (2019) from Python to Go
• Discord (2020) from Go to Rust
• HSBC (2020) from DB2 to MongoDB 
• Unnamed US Wireless Carrier (2020) from Oracle to PostgreSQL
• ListenBrainz  (2020) from InfluxDB to TimescaleDB
• Dropbox (2020) from Nginx to Envoy
• Repustate (2020) from Python to Go
• SimilarWeb (2020) from NodeJS to Go
• PayPal (2020) from C++ to Go
  
• KhanAcademy (2021) from Python to Go
• ownCloud (2021) from PHP to Go
• Percona (2021) from Prometheus to VictoriaMetrics
• Aluma (2021) from C# to Go
  

So many migrating to Go ^^. If it's not about migration, there's a lot more here that apparently choose Go (interviews, from X to Go, and also more here).

NOTE: this list will be no longer updated, you can see the lastest changes on github repo so anyone can contribute/update.

Btw why not MongoDB or CockroachDB.. but I think now they are getting better.

If you found any more news like this, paste the link on the comment, I'll gladly add them on the list.