Timeline

2005

Reddit: from CommonLISP to Python
Bloomberg: from C/CPP to JavaScript

2010

Bing: from CPP to DotNET

2011

Twitter: from Ruby to Scala
UrbanAirship: from MongoDB to PostgreSQL
Mixpanel: from Erlang to Python

2012

LinkedIn: from Ruby to NodeJS
MoovWeb: from Unknown to Go
NTPPool: from Perl to Go
DLGoogle: from CPP to Go
Bitly: from Python/C to Go
SoundCloud: from Ruby to Go
SmartyStreets: from DotNET to Go
Toggl: from Ruby to Go
Shareaholic: from MongoDB to Riak
DigiDoc: from MongoDB to PostgreSQL
Etsy: from MongoDB to MySQL
TekPub: from MongoDB to PostgreSQL
TargeterApp: from NodeJS to Ruby
Dropbox: from JavaScript to CoffeeScript

2013

PayPal: from Java to NodeJS
Koding: from NodeJS to Go
Iron.io: from Ruby to Go
Zalora: from PHP to Go
TimeHop: from Ruby to Go
CanonicalJuju: from Python to Go
Facebook: from PHP to Hack
Blippex: from AWS to OVH

2014

Instill: from AngularDart to Polymer
Workia: from ActionScript to Dart
TrustWave: from ActionScript/Flex to Dart
Facebook: from Erlang to CPP
Grab: from Ruby/NodeJS to Go
CloudFlare: from PostgreSQL to CitusDB

2015

Auth0: from Apache_Kafka to ZeroMQ
Pinterest: from Java to Elixir
PresidentUniversity: from PHP/MySQL to Go/PostgreSQL
UserLike: from MySQL/MongoDB to PostgreSQL
Olery: from MongoDB to PostgreSQL
CrowdStrike: from Scala to Go
DockYard: from Ruby to Elixir
Parse: from Ruby to Go
Marriot: from Unknown to Couchbase

2016

CrowdStrike: from Scala to Go
Tokopedia: from Perl to Go
Uber: from PostgreSQL to MySQL
Uber: from NodeJS to Go/Java
Uber: from Python to Go
Digg: from NodeJS to Go
Google AdWords: from GWT to Angular/Dart
Slack: from PHP to Hack
Sky: from Oracle to Couchbase
Amadeus: from Oracle to Couchbase
AppsFlyer: from Druid/MongoDB/Redis/Cassandra/Redshift to SingleStore
Dropbox: from AWS to Self-Managed

2017

BleacherReport: from Ruby to Elixir
UpGuard: from JRuby to Go
Movio: from Scala to Go
Discord: from MongoDB to Cassandra
Uber: from Riak/Solr to Cassandra
Swat.io: from MySQL to PostgreSQL
Poki: from PHP to Go
Stream: from Python to Go
Baidu: from MySQL to CockroachDB
Boxzilla: from PHP to Go
GAEA: from MongoDB/MySQL to TiDB
Shippable: from Go to NodeJS
Shippable: from MongoDB to PostgreSQL
GeekyAnts: from ReactNative to Flutter
Yuanfudao: from MySQL to TiDB
Dropbox: from CoffeeScript to TypeScript
Manage: from MySQL/Hadoop/Hive/Kafka to SingleStore
BlueShift: from MSSQLServer to SingleStore
Myntra: from Redshift to SingleStore
TreeScale: from Python to Go

2018

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

2019

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

2020

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

2021

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

2022

Factors.ai: from PostgreSQL to SingleStore
Prismatic.io: from AWS_Lambda to Amazon_ECS
Fleet: from AWS to Hetzner
Ntop: from nIndex to Clickhouse
Etsy: from React to Preact
ReviewBunny: from React to RubyOnRails
AntMoney: from PostgreSQL to SingleStore
CaptainMetrics: from MongoDB to SingleStore
SeventhSense: from Amazon_Kinesis/Kafka to RedPanda
Hashura: from NodeJS to Go
Kiwi: from PostgreSQL/Cassandra to ScyllaDB
Rakuten: from Cassandra to ScyllaDB
Wipro: from HBase to Aerospike
nhost: from PostgreSQL to PostgreSQL/Kubernetes
Prerender.io: from AWS to Self-Managed
Umes: from Go/GraphQL to TypeScript/Prisma/tRPC
K-Optional: from Firebase to Supabase
Contexte: from React to HTMX
Rakuten: from RedHat to RockyLinux
NucleusData: from MariaDB to SingleStore
Rolebase: from Firebase to Nhost
Jamf: from Java to Go
TheirStack.com: from PostgreSQL to Clickhouse
Matrix: from Kafka to NATS
CloudFlare: from ElasticSearch to Clickhouse

2023

HiFi: from BigQuery to Clickhouse
RisingWaveLabs: from CPP to Rust
Vercel: from Go to Rust
Discord: from Cassandra to ScyllaDB
RocLang: from Rust to Zig
37Signals: from Kubernetes to mrsk
CultureAmp: from Elm to React
ApiGear: from NodeJS to Go
Prequel: from RabbitMQ to PostgreSQL
Trendyol: from Scala to Go
AmazonPrimeVideo: from AWS_Lambda to Amazon_EC2/Amazon_ECS
Svelte: from TypeScript to JavaScript/JSDoc
ValTown: from Supabase to PostgreSQL/Render
ChessCraft: from MongoDB to PostgreSQL/Redis
Fly.io: from Nomad to flyd
CodeDamn: from Prisma/MongoDB to PostgreSQL
LinkedIn: from JSON to ProtoBuf
Bookshop.org: from RubyOnRails to Go/Encore
Lizza: from Firebase to Encore
InfluxData: from Go to Rust
FileWave: from ZeroMQ to NATS
StackOverflow: from jQuery to Svelte
NicelandVPN: from Electron to Wails.io
DoorDash: from Aurora_PostgreSQL to CockroachDB
Levenue: from SvelteKit to Go/HTMX
Lyft: from Druid to Kafka/Clickhouse
Tencent: from Clickhouse to ApacheDoris
Ongage: from MySQL to Clickhouse
Digger: from Python to Go

2024

eFishery: from Amazon_CloudFront to CloudFlare
Vercel: from Go to Rust
Ramp: from PostgreSQL to Clickhouse
Infiscal: from MongoDB to PostgreSQL
Reddit: from S3_metadata to Aurora_PostgreSQL
Coralogix: from PostgreSQL to ScyllaDB
Fablehenge: from React to Svelte
Corsearch: from MySQL to Clickhouse
Uber: from DynamoDB to LedgerStore
37signals: from Mac to Linux
Beehiiv: from PostgreSQL to Clickhouse
Bonree: from ZooKeeper to ClickhouseKeeper
CommonRoom: from PostgreSQL to Clickhouse
Shopee: from Druid/Hive/Presto to Clickhouse
OpenMeter: from PostgreSQL/Kafka/kSqlDB to Clickhouse
trip.com: from ElasticSearch to Clickhouse
Didi: from ElasticSearch to Clickhouse
Figma: from Skew to TypeScript

2025

FlockSafety: from Redshift to Clickhouse
EpicGames: from DynamoDB to ScyllaDB
DigitalTurbine: from DynamoDB to ScyllaDB
DaggerIO: from React to Go/WASM
PayU: from Consul to Raft
Honeybadger: from Sidekiq to Kafka
Tractian: from MongoDB to ScyllaDB
Slice: from MongoDB to PostgreSQL
AVEQ: from Ruby/RubyOnRails to TypeScript/Express
Cloudflare Developer Documentation: from Go/Hugo to TypeScript/Astro
Aquis Stock Exchange: from Self-Managed to Cloud/AWS
Checkly: from Heroku to AWS
Microsoft TypeScript Compiler: from TypeScript to Go

Top 10 From

MySQL: 40
MongoDB: 26
PostgreSQL: 19
Ruby: 17
Cassandra: 16
Python: 15
NodeJS: 11
React: 9
PHP: 9
ElasticSearch: 8

Top 10 To

Go: 57
TiDB: 32
Clickhouse: 25
SingleStore: 23
PostgreSQL: 22
ScyllaDB: 16
YugabyteDB: 10
Rust: 8
TypeScript: 6
Nomad: 6

Top 10 Migration

MySQL to TiDB: 25
MongoDB to PostgreSQL: 16
Python to Go: 13
Cassandra to ScyllaDB: 10
Ruby to Go: 10
NodeJS to Go: 9
PHP to Go: 7
PostgreSQL to Clickhouse: 7
Kubernetes to Nomad: 5
MySQL to SingleStore: 5