List of Tech Migrations

list of public tech migrations (create a PR to if you have correction or addition), originally from this blog which sometimes copied to this medium account.

note:

• migration can be partial (not whole stack, since most companies out there not using single programming language/database anyway)
• year = year of the article/presentation, or the year of migration if stated on the article/presentation.
• discuss here: reddit thread / ycombinator discussion

graph

2005

• Reddit (2005) from CommonLISP to Python
• Bloomberg (2005) from C/C++ to Javascript

2010

• Bing (2010) from C++ to DotNET

2011

• Twitter (2011) from Ruby to Scala
• UrbanAirship (2011) from MongoDB to PostgreSQL
• Mixpanel (2011) from Erlang to Python

2012

• LinkedIn (2012) from Ruby to NodeJS
• MoovWeb (2012) from ? to Golang
• NTPPool (2012) from Perl to Golang
• DLGoogle (2012) from C++ to Golang
• Bitly (2012) from Python/C to Golang
• SoundCloud (2012) from Ruby to Golang
• SmartyStreets (2012) from .NET to Golang
• Toggl (2012) from Ruby to Golang
• 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
• Dropbox (2012) from JavaScript to CoffeeScript

2013

• PayPal (2013) from Java to NodeJS
• Koding (2013) from NodeJS to Golang
• Iron.io (2013) from Ruby to Golang
• Zalora (2013) from PHP to Golang
• TimeHop (2013) from Ruby to Golang
• CanonicalJuju (2013) from Python to Golang
• Facebook (2013) from PHP to Hack
• Blippex (2013) from AWS to OVH

2014

• 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 Golang
• CloudFlare (2014) from PostgreSQL to CitusDB

2015

• Auth0 (2015) from Apache Kafka to ZeroMQ
• Pinterest (2015) from Java to Elixir
• PresidentUniversity (2015) from PHP/MySQL to Golang/PostgreSQL
• UserLike (2015) from MySQL/MongoDB to PostgreSQL
• Olery (2015) from MongoDB to PostgreSQL
• CrowdStrike (2015) from Scala to Golang
• DockYard (2015) from Ruby to Elixir
• Parse (2015) from Ruby to Golang
• Marriot (2015) from Unknown to Couchbase

2016

• CrowdStrike (2016) from Scala to Golang
• Tokopedia (2016) from Perl to Golang
• Uber (2016) from PostgreSQL to MySQL
• Uber (2016) from NodeJS to Golang/Java
• Uber (2016) from Python to Golang
• Digg (2016) from NodeJS to Golang
• Google AdWords (2016) from GWT to Angular/Dart
• Slack (2016) from PHP to Hack
• Sky (2016) from Oracle to Couchbase
• Amadeus (2016) from Oracle to Couchbase
• AppsFlyer (2016) from Druid/MongoDB/Redis/Cassandra/Redshift to SingleStore
• Dropbox (2016) from AWS to self-managed/own-datacenter

2017

• BleacherReport (2017) from Ruby to Elixir
• UpGuard (2017) from JRuby to Golang
• Movio (2017) from Scala to Golang
• Discord (2017) from MongoDB to Cassandra
• Uber (2017) from Riak/Solr to Cassandra
• Swat.io (2017) from MySQL to PostgreSQL
• Poki (2017) from PHP to Golang
• Stream (2017) from Python to Golang
• Baidu (2017) from MySQL to CockroachDB
• Boxzilla (2017) from PHP to Golang
• GAEA (2017, 2019) from MongoDB/MySQL to TiDB
• Shippable more (2017) from Golang+MongoDB to NodeJS+PostgreSQL
• GeekyAnts (2017) from ReactNative to Flutter
• Yuanfudao (2017) from MySQL to TiDB
• Dropbox (2017) from CoffeeScript to TypeScript
• Manage (2017) from MySQL/Hadoop/Hive/Kafka to SingleStore
• BlueShift (2017) from MSSQLServer to SingleStore
• Myntra (2017) from RedShift to SingleStore
• TreeScale (2017) from Python to Golang

2018

• AppTree (2018) from Java/Kotlin/ObjC/Swift to Dart
• SendGrid (2018) from Perl/Python to Golang
• Bukalapak (2018) from Ruby/MySQL to Golang/MongoDB/ElasticSearch/CloudSQL
• Centrifugo (2018) from Python to Golang
• TheGuardian (2018) from MongoDB to PostgreSQL
• CloudFlare (2018) from CitusDB to Clickhouse
• Github (2018) from jQuery to vanilla javascript
• Meituan (2018) from MySQL to TiDB
• iQiyi (2018) from MySQL to TiDB
• Yiguo (2018) from Hadoop/MSSQLServer to TiDB
• Mobike (2018) from MySQL to TiDB
• CashApp (2018) from MySQL to Vitess
• Bing (2018) from DotNET to DotNetCore
• PixelJets (2018) from ElsticSearch+LogStash+Kibana/BigQuery to Clickhouse
• Insite360 (2018) from RedShift to SingleStore
• Areeba (2018) from Hadoop/MariaDB to SingleStore
• Wag (2018) from MySQL to SingleStore
• Fanatics (2018) from ElasticSearch to SingleStore
• Pandora (2018) from Hadoop to SingleStore
• Twitch (2018) from Ruby to Golang
• Kairos (2018) from PHP to Golang

2019

• AppsFlyer (2019) from Clojure to Golang
• Deliveroo (2019) from Ruby to Rust
• Amazon (2019) from Oracle to AuroraPostgres/DynamoDB
• 2FintechGiants (2019) from Oracle to CockroachDB
• Codism (2019) from Python to Golang
• Comcast (2019) from Cassandra to ScyllaDB
• Zhihu (2019) from MySQL to TiDB
• JDCloud (2019) from MySQL to TiDB
• NetEaseGames (2019) from MySQL to TiDB
• Xiaomi (2019) from MySQL to TiDB
• BookMyShow (2019) from MSSQLServer to TiDB
• Trivago (2019) from Kubernetes to Nomad
• Narvar (2019) from DynamoDB/PostgreSQL-RDS to YugabyteDB
• PlumeDesignsInc (2019) from MongoDB to YugabyteDB
• SkyElectric (2019) from MySQL/MongoDB/NodeJS to PostgreSQL/ElasticSearch/ScyllaDB/Elixir
• Paytm (2019) from ElasticSearch to Loki
• ContentSquare (2019) from ElsticSearch+LogStash+Kibana to Clickhouse
• Sentry (2019) from PostgreSQL+Redis to Clickhouse
• HashNode (2019) from Nginx to Caddy
• CitizensBank (2019) from Kubernetes to DockerSwarm
• Medaxion (2019) from MySQL to SingleStore
• GoGuardian (2019) from Druid to SingleStore
• AFortune50Company (2019) from Hadoop to SingleStore
• diwo (2019) from Redis/Cassandra to SingleStore
• KurtoSys (2019) from CouchBase to SingleStore
• monday.com (2019) from ElasticSearch to SingleStore
• GumGum (2019) from Cassandra to ScyllaDB
• Insider (2019) from Ruby to Golang
• Codism (2019) from Python to Golang
• Twitch (2019) from EmberJS to ReactJS

2020

• Discord (2020) from Golang to Rust
• HSBC (2020) from DB2 to MongoDB
• UnnamedUSWirelessCarrier (2020) from Oracle to PostgreSQL
• ListenBrainz (2020) from InfluxDB to TimescaleDB
• Dropbox (2020) from Nginx to Envoy
• Dropbox (2020) from Python to Rust
• Repustate (2020) from Python to Golang
• SimilarWeb (2020) from NodeJS to Golang
• PayPal (2020) from C++ to Golang
• Discord (2020) from Cassandra to ScyllaDB
• Weblove (2020) from React to Svelte
• PalFish (2020) from MongoDB to TiDB
• Shopee (2020) from MySQL to TiDB
• WeBank (2020) from MySQL to TiDB
• ChinaTelecomBestpay (2020) from Oracle to TiDB
• U-Next (2020) from MySQL to TiDB
• ZTOExpress (2020) from OracleExadata to TiDB
• Xiaohongshu (2020) from MySQL to TiDB
• BankOfBeijing (2020) from ? to TiDB
• BankOfChina (2020) from MySQL to TiDB
• ZhuanZhuan (2020) from MySQL to TiDB
• BIGO (2020) from MySQL to TiDB
• VNG/ZaloPay (2020) from MySQL to TiDB
• VIPKid (2020) from MySQL to TiDB
• Kroger (2020) from PostgreSQL to YugabyteDB
• Censys (2020) from PostgreSQL to YugabyteDB
• Justuno (2020) from MSSQLServer/Cassandra to YugabyteDB
• Xignite blog (2020) from MSSQLServer to YugabyteDB
• Voiceland (2020) from PostgreSQL/MSSQLServer to YugabyteDB
• Jutsuno (2020) from Cassandra/Neo4j/MSSQLServer/CockroachDB to YugabyteDB
• Manetu (2020) from Cassandra? to YugabyteDB
• BRIKL (2020) from DynamoDB to YugabyteDB/Hasura
• StadiaMaps (2020) from CockroachDB to ScyllaDB
• Roblox (2020) from Windows to Linux/Nomad
• Rekki (2020) from Elixir to Golang
• Tubber (2020) from PHP to Golang
• EBay (2020) from ApacheDruid to Clickhouse
• Shippo (2020) from PostgreSQL to Aurora
• Nucleus (2020) from MariaDB to SingleStore
• AMajorOilAndGasCompany (2020) from ElasticSearch to SingleStore
• TapJoy (2020) from MySQL to SingleStore
• ARNES (2020) from InfluxDB to VictoriaMetrics
• DevOpsProdigy (2020) from MySQL to Clickhouse
• MyWorld (2020) from Cassandra to CockroachDB
• PlotProjects (2020) from MongoDB to PostgreSQL
• SpaceCloud (2020) from gRPC to GraphQL
• Sudo (2020) from React to Svelte
• LoginRadius (2020) from NodeJS to Golang

2021

• KhanAcademy (2021) from Python to Golang
• ownCloud (2021) from PHP to Golang
• Percona (2021) from Prometheus to VictoriaMetrics
• Aluma (2021) from C# to Golang
• Olery (2021) from MongoDB to PostgreSQL
• NitroKey (2021) from Ubuntu Core to Debian
• Slack (2021) from HAProxy to Envoy
• Github (2021) from Ruby to Golang
• GumGum (2021) from Cassandra to ScyllaDB
• SvelteKit (2021) from RollUp/SnowPack to Vite
• ReplIt (2021) from WebPack to Vite
• GitPod (2021) from React/Gatsby to SvelteKit
• NinjaVan (2021) from MySQL to TiDB
• Meituan (2021) from MySQL to TiDB
• AutoHome (2021) from MSSQLServer to TiDB
• 58.com (2021) from MySQL to TiDB
• Chehaoduo (2021) from MySQL to TiDB
• KunLun (2021) from MySQL to TiDB
• GiG (2021) from RedShift to Clickhouse
• Brex (2021) from Elixir to Kotlin
• Storj (2021) from Python to Golang
• CoinBase (2021) from Native to ReactNative
• Archive.org (2021) from Kubernetes to Nomad/Consul
• Koyeb (2021) from Kubernetes to Nomad/Firecracker/Kuma
• AccelByte (2021) from Kubernetes to Nomad/Consul
• Expedia (2021) from Cassandra to ScyllaDB
• Grab (2021) from Cassandra to ScyllaDB
• ReadyForSky (2021) from Redis to Tarantool
• Conductor (2021) from Kubernetes to Nomad
• Uber (2021) from ElsticSearch+LogStash+Kibana to Clickhouse
• ClickHouse (2021) from ZooKeeper to ClickhouseKeeper/NuRaft
• Wallaroo (2021) from Pony to Rust
• ContentServ (2021) from Cassandra to ScyllaDB
• Etsy (2021) from Javascript to Typescript
• JD.com (2021) from MySQL to TiDB
• HuyaLive (2021) from MySQL to TiDB
• LevelUpTutorials (2021) from React to Svelte
• Voucherify (2021) from MongoDB to PostgreSQL
• Fathom (2021) from MySQL/Redis/DynamoDB to SingleStore
• GrooveX (2021) from Thanos to VictoriaMetrics
• Percona (2021) from Prometheus to VictoriaMetrics
• SimilarWeb (2021) from NodeJS to Golang
• DoorDash (2021) from Python to Kotlin
• WeWatch (2021) from MongoDB to PostgreSQL
• CodeSignal (2021) from MongoDB+Meteor to Redis
• Sequoia (2021) from ElasticSearch to Rockset
• TimeFlow (2021) from Druid to Clickhouse
• ToolJet (2021) from Ruby to NodeJS
• Dream11 (2021) from Elasticache Redis to Aerospike
• AirTel (2021) from Oracle TimesTen to Aerospike
• PostHog (2021) from PostgreSQL to Clickhouse

2022

• Factors.ai (2022) from PostgreSQL to SingleStore
• Prismatic.io (2022) from AWS Lambda to Amazon ECS
• Fleet (2022) from AWS to Hetzner
• Ntop (2022) from nindex to Clickhouse
• Etsy (2022) from React to Preact
• ReviewBunny (2022) from React to RubyOnRails
• AntMoney (2022) from PostgreSQL to SingleStore
• CaptainMetrics (2022) from MongoDB to SingleStore
• SeventhSense (2022) from AmazonKinesis/Kafka to RedPanda
• Hashura (2022) from NodeJS to Golang
• Kiwi (2022) from PostgreSQL/Cassandra to ScyllaDB
• Rakuten (2022) from Cassandra to ScyllaDB
• Wipro (2022) from HBase to Aerospike
• nhost (2022) from PostgreSQL-RDS to PostgreSQL+Kubernetes
• Prerender.io (2022) from AWS to InHouse
• Umes (2022) from Golang+GraphQL to TypeScript+Prisma+tRPC
• K-Optional (2022) from Firebase to Supabase
• Contexte (2022) from React to htmx
• Rakuten (2022) from RedHat to RockyLinux
• NucleusData (2022) from MariaDB to SingleStore
• Rolebase (2022) from Firebase to Nhost
• Jamf (2022) from Java to Golang
• TheirStack.com (2022) from PostgreSQL to Clickhouse
• Matrix (2022) from Kafka to NATS

2023

• HiFi (2023) from BigQuery to Clickhouse
• RisingWaveLabs (2023) from C++ to Rust
• Vercel (2023) from Golang to Rust
• Discord (2023) from Cassandra to ScyllaDB
• RocLang (2023) from Rust to Zig
• 37Signals (2023) from Kubernetes to mrsk
• CultureAmp (2023) from Elm to React
• ApiGear (2023) from NodeJS to Golang
• Prequel (2023) from RabbitMQ to PostgreSQL
• Trendyol (2023) from Scala to Golang
• AmazonPrimeVideo (2023) from AWS Lambda to AWS EC2+ECS
• Svelte (2023) from TypeScript to Javascript+JSDoc
• ValTown (2023) from Supabase to PostgreSQL+Render
• ChessCraft (2023) from MongoDB to PostgreSQL+Redis
• Fly.io (2023) from Nomad to flyd
• CodeDamn (2023) from Prisma/MongoDB to PostgreSQL
• LinkedIn (2023) from JSON to ProtoBuf
• Bookshop.org (2023) from RubyOnRails to Golang+Encore
• Lizza (2023) from Firebase to Encore
• InfluxData (2023) fom Golang to Rust
• FileWave (2023) from ZeroMQ to NATS
• StackOverflow (2023) from jQuery to Svelte
• NicelandVPN (2023) from Electron to Wails.io
• DoorDash (2023) from Aurora Postgres to CockroachDB
• Levenue (2023) from SvelteKit to Golang+HTMX
• Lyft (2023) from Druid to Kafka+Clickhouse
• Tencent (2023) from Clickhouse to ApacheDoris
• Ongage (2023) from MySQL to Clickhouse

2024

• eFishery (2024) from AWS CloudFront to CloudFlare
• Vercel (2024) from Go to Rust
• Ramp (2024) from PostgreSQL to Clickhouse
• Infiscal (2024) from MongoDB to PostgreSQL
• Reddit (2024) from S3 metadata to Aurora PostgreSQL
• Coralogix (2024) from PostgreSQL to ScyllaDB
• Fablehenge (2024) from React to Svelte
• Corsearch (2024) from MySQL to Clickhouse
• Uber (2024) from DynamoDB to LedgerStore
• 37signals (2024) from Mac to Linux
• Beehiiv (2024) from PostgreSQL to Clickhouse
• Bonree (2024) from ZooKeeper to ClickhouseKeeper
• CommonRoom (2024) from PostgreSQL to Clickhouse
• Shopee (2024) from Druid+Hive+Presto to Clickhouse
• OpenMeter (2024) from PostgreSQL+Kafka+kSqlDB to Clickhouse
• trip.com (2024) from ElasticSearch to Clickhouse
• Didi (2024) from ElasticSearch to Clickhouse