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AWS PHP NodeJS Agile React Javascript ES6, Node.js, AWS (Lambda, SNS, EC2, ECS). SQL NoSQL databases (MySQL, MongoDB). GIT/Bitbucket

Rails 5.2, Ruby 2.3.7, Python, R, PostgreSQL 9.6, React 0.17, AWS, Docker, RabbitMQ, Sidekiq, Snowflake

Blog post on our tech stack

Lever uses our own open source real-time framework called Derby that syncs all data via Operational Transformation. OT is the way we handle concurrency conflicts for any piece of data that is edited at the same time. In addition to real-time sync, OT allows us to provide a smoother UI since we can render updates on the client instantly without waiting for our backend to respond, while still guaranteeing consistency.

Lever makes extensive use of AWS, Docker, Node, Mongo, ElasticSearch, and Redis within our infrastructure. We use tools like Hubot to streamline deployments and Datadog to see what’s going on under the hood. In addition to automating all the things, we love to version them too! Our systems are all created using Terraform and Chef, working together to ensure consistency at all costs.

Python, JavaScript, Ruby, Unix, Linux, React.js, Ruby-on-Rails, Ajax, Docker, SQL, Apache, Amazon-web-services, DataDog

Ruby on Rails, Java, Elixir, React.js, GraphQL, Node.js, AWS, Redis, Spark & Scala, (Data team)

AWS, DynamoDB, Go, InfluxDB, Kubernetes (EKS), PostgreSQL, Python, ReactJS 16+ (Hooks), Swift, Terraform

Rails API, Ruby, Python, Postgres, PostGIS, React.js, Redux, Typescript, Heroku, AWS, Terraform

Swift, JavaScript, TypeScript, Native iOS, UIKit, Combine, Node.js, Vapor Swift, React, Next.js, Postgres, MongoDB

Golang, React, Redux, MongoDB, ElasticSearch, Redis, Kinesis, NATS, TimescaleDB, Lambda, Node.js, Postgres, Typescript

Frontend: React, Relay, Flow, Jest, Enzyme.

Mobile: React Native, Apollo.

Backend: Ruby on Rails, Postgres, GraphQL, Python, RSpec, Java, Kotlin, MongoDB, Clojure.

CI: GitHub, Buildkite.

Infrastructure: AWS, Ruby, Terraform, Kubernetes.

Ruby on Rails, Sidekiq

PostgreSQL, Redis, Elasticsearch

React + Typescript

RSpec, Chromatic, Jest, Storybook

CircleCI, Jenkins, Ansible, Terraform

AWS ecosystem (EC2, S3, RDS, Redshift, many others)

APIs & Services: python+flask, thrift for API specification.

Backend infrastructure: AWS tools (S3, SQS, SNS, etc.). Graylog for logging. Cloudwatch, Icinga, PagerDuty for monitoring. Jenkins for CI/CD. Airbrake for exception monitoring.

Releasing: Regular releases from master twice weekly + Out-of-cycle releases when needed to facilitate the roll-out of specific features.

Mobile: Kotlin is our primary language for our native Android apps. Swift3 is our primary language for our native iOS apps.

Front-end Web: React, hooks, redux, typescript & modern javascript.

Node.js & Express backend, Golang CLI, Postgres database, Google Cloud

Virtualization/Cloud - AWS: ECS, Fargate

OS - Linux

Data Layer - AWS RDS postgres, OLAP Snowflake, OLTP Fauna, AWS ES

Application - Scala, REST API

Presentation Layer - React JS

Orchestration - Containers, Terraform, AWS Cloudformation, AWS Fargate, Docker

Frameworks - Akka

Web: PHP, JavaScript, TypeScript, React/Redux, MySQL, Docker, and Elixir.

Mobile: Kotlin, Swift, Java, Objective-C, React Native, and Electron.

Systems: Docker, Nginx, PHP, C, Lua, MySQL, MongoDB, Node.js, Statsd, Graphite, Prometheus, Elasticsearch, Logstash, Hadoop, MogileFS, HDFS, and BGP.

Data: Hive, Impala, HBase, Spark, HDFS, Python, Java, Scala, Kafka, Elasticsearch, MySQL, Solr, and Lucene.

Frontend – Custom MV* JS Framework, React, SASS, Handlebars

Backend – Perl, Go, NodeJS, Python

Data Science – Jupyter, Python, Clickhouse

Internal Operations – Linux, Terraform, Chef, Azure, Jenkins

Privacy Engineering – JavaScript, Python

iOS + macOS – Swift, Bitrise

Android – Kotlin, Jenkins

Windows - C#

Python, Flask, Javascript, React, HTML/CSS, Sass, React Native, Expo, GraphQL, Postgres, Redis, Heroku, AWS

Clojure backend, React front end, MongoDB, Kubernetes, AWS. Full stack here.

Ruby on Rails, Ember.js, iOS app (Swift), Android app (Kotlin/Java)

React, React Native, Node.js, Elasticsearch, Redis, AWS, Kubernetes, Kafka

We put a lot of care into how we ship code. Shipping fast starts with serious investment in tooling, like continuous deployment with multiple pushes per day. Shipping sustainably is about more than just effective work – it requires commitment to creating an environment where people can focus and get creative. Our tech stack includes:

React JS, TypeScript, Scala, Node.js, AWS, Graphite, Redis, DynamoDb, Kubernetes, MySQL, Python, Amazon Redshift, Swift, Kotlin, GraphQL, Swagger, ZooKeeper, Envoy

Our philosophy is keep it simple, don’t reinvent the wheel, and have great test coverage so we can refactor safely with ease as the product evolves.

We’re on service-oriented architecture. Our backend is composed of a collection of Java services that communicate via RPC. Our frontend web stack is a React/Redux application. We use Objective-C and Swift in the iOS app and Kotlin in the Android app. Our data infrastructure is cloud native in AWS and includes S3, EMR, Redshift/RDS, Lambda, and ECS.

Python, Airflow, Docker (Marathon/Mesos), Snowflake (currently migrating from Redshift), Databricks (Spark on EC2), GitHub, Kafka, Segment.io, Fivetran, AWS (S3, Kinesis Firehose)

We believe in choosing technologies pragmatically, balancing tradeoffs between widespread support, power, and accessibility. Our primary language is Python, augmented with C/C++, PyTorch, and other extensions. We use code tools like Bazel, mypy, and automatic formatters to reduce the cognitive overhead of our work, and ops tools like Docker and Salt to automate operational burdens. Our code runs in a variety of environments, including AWS, Google Cloud, professionally-hosted private clouds, and most importantly, on our own servers at customer sites. We collaborate and document our work with Slack, GitHub, Jira, and Confluence.

Web - Node, React, Python, PostgreSQL.

Mobile - React Native, Swift (iOS) / Java (Android).

JavaScript, Python, Node.js, React + React Native, AWS Lambda, Spark, Kinesis, MongoDB, Redshift

Core App (2010+): PHP7.1, Apache, ReactJS, AWS EC2, RDS, SQS, Redis. Services (2015+): NodeJS, Golang, DynamoDB, Redis, Lambda, Docker. Clients: Electron, C#, Swift 4, Kotlin, Java. Analytics and Prediction: AWS Aurora, Athena, Hadoop, SKLearn. APIs: Webhooks, OpenAPI, SDK Generation, developer.bombbomb.com. CI: Github, Jenkins, TeamCity, TravisCI, Serverless. Video Pipeline: Unique realtime clustered encoding, WebRTC, CloudFront. Delivery: PowerMTA, Twilio. Backoffice: Chargify, NetSuite, Salesforce, Zendesk, Hubspot.

React, Node.js, Python, Java

Ruby, Rails, Javascript, React, MySQL, Kubernetes

Python, AWS, Spark, ElasticSearch, Docker, Airflow, Kubernetes

Backend: Node + Express, Typescript, Go Microservices. Frontend: Next.js, React + Hooks, Storybook. Infrastructure: Heroku + AWS, CircleCI, DataDog.

Ruby on Rails

Swift

Postgres

Redis

Memcache

RabbitMQ

AWS

Heroku

Ruby / Javascript / Python / Golang, Sinatra / Rails / React, MySQL / Mongo, Presto for data warehouse, Docker / Kubernetes for deployment, REST / JSON / gRPC for service communication