Y Combinator Resources for Developers

YC has built many resources that may be helpful for developers over the years. This page collects them in one place.

Websites run by YC

Hacker News

Articles and discussion for hackers

Arc Language

The Arc Programming Language, which Hacker News is written in

Work at a Startup

Jobs for developers at YC companies

Startup Playbook.

Startup advice from YC distilled into one document

Blog posts and Essays

Ask a Female Engineer

A series of interviews with female engineers

Beating the Averages

A classic article on using powerful programming languages as a secret weapon

Better Bayesian Filtering

A proposal for a better bayesian filtering algorithm

How To Get Into Natural Language Processing

An introduction to NLP

Learning Math for Machine Learning

Mathematical background for learning Machine Learning

Data Packages for Fast, Reproducible Python Analysis

Advice on data packages from Quilt Data

Relevant YC Companies

Many YC companies are building developer tools. This is a list of them.

Manycore.io w2019 ManyCore.io speeds up computer programs by spreading them automatically onto several cores
PreFlight w2019 Code-Free Automated UI Testing.
Alpha Vantage s2018 We provide accessible & affordable APIs for financial market data
OneGraph s2018 A GraphQL API wrapping and connecting all of the internet's APIs
Anima App s2018 We convert design to code
Federacy s2018 Security testing and bug bounty platform.
Numericcal s2018 Easily deploy, optimize and manage Deep Learning modules on IoT and mobile devices.
RevenueCat s2018 RevenueCat is a simple API for managing in-app subscriptions.
Airship w2018
Draftbit w2018 Draftbit is a new way to build cross-platform, native iOS and Android apps in minutes.
EnvKey w2018 Password manager for API keys
CodeStream w2018 The knowledge base behind your codebase.
Haiku w2018 App builder that unifies design and code
Hexel w2018 Create a cryptocurrency for your community.
Jido Maps w2018 A lightweight API for persistent augmented reality.
NewCraft w2018 A marketplace for modern paid apprenticeships.
Repl.it w2018 In 2 seconds, boot up an online programming environment for your favorite language.
Sqreen w2018 Sqreen revolutionizes the way engineering teams protect their apps & customers against attacks.
AssemblyAI s2017 AssemblyAI builds customized speech-to-text models for customers working with voice data. Our customers use these models to transcribe phone calls, media, and other types of voice data with unparalleled accuracy and speed.
Escher Reality s2017 The backend for Augmented Reality.
Gopher s2017 Get things done without leaving your inbox.
Plasticity s2017 APIs that help developers create human-like natural language interfaces.
PullRequest s2017 Code review as a service - combining automation with a network of on-demand reviewers
Templarbit s2017 Protecting applications from malicious activity
Bitrise w2017 Hosted Continuous Integration and Delivery for mobile apps
Armory w2017 Continuous Deployment for the Enterprise
Retool w2017 Faster way of building internal tools for ops teams
FloydHub w2017 Floyd is Heroku for Machine Learning and Deep Learning. Run and deploy your project to the cloud with zero-setup.
XIX.ai w2017 Next generation Image Intelligence platform for Defence, Intelligence and enterprise sectors.
DevColor s2016 We give Black software engineers the support they need to enter and advance in the tech industry.
Expo s2016 Expo brings together the best of web (development speed, fast iteration cycles, easy deploys, and automatic cross-platform support) and the performance and user experience of native apps. Let's talk if you're planning to build a mobile app.
MessageBird s2016 MessageBird is an API for sending Text, Voice & Chat messages. We offer the most advanced messaging API, packed with features and customizable parameters for high-volume and demanding message senders.
NuCypher s2016 The privacy layer of the decentralized web.
OpenAI s2016
Opsolutely s2016 Automated deployments for software teams.
RunKit s2016
Scale s2016 Human-powered data for AI applications.
Wallarm s2016 Application and API security for the modern web
Women Who Code s2016 WWCode is a non profit with a set of programs that helps mid-career engineers get promoted.
Instabug w2016 In-app feedback and bug reporting for mobile apps. We're helping apps squash bugs in their beta apps and engage users in their production apps. If you're building a mobile app, we'd love to talk.
SendBird w2016 A flexible and scalable chat and messaging API for mobile apps and websites.
Mux w2016 API to video infrastructure and analytics.
Appcanary s2015 Appcanary tracks the dependencies you use in your apps and servers and notifies you whenever you're vulnerable to security vulnerabilities.
Foxpass s2015 Making enterprise security practices available for all companies.
Bitmovin s2015 Video Infrastructure for the Web
Convox s2015 Open-source tools for deploying, managing, and monitoring cloud infrastructure.
Font Awesome s2015 Font Awesome makes it easy to add vector icons and social logos to your website. And Pro gives 1,000+ more icons and SVG framework!
Gravitational s2015 Gravitational helps SaaS companies make more money by giving them a turn key "on-premise" offering for their enterprise customers.
Heroic Labs s2015 Social infrastructure for games and apps. We've built Nakama server. An open-source distributed server for social and realtime games and apps.
SnapEDA s2015 The Internet's first parts library for circuit board design. Build circuit boards faster with millions of free symbols & footprints.
SourceDNA s2015 Bringing transparency to the app stores and helping developers build better apps. Acquired by Apple in 2016.
Zeplin s2015 Zeplin is a connected space for product teams where they can share designs, generate specs, assets and code snippets.
GitLab w2015 Git repository management, code reviews, issue tracking, issue boards, activity feeds, wikis and continuous integration. Community driven with more than 1000 contributors.
Moltin w2015 eCommerce building blocks through simple APIs for websites & apps. APIs include inventory, cart, checkout, payments and more.
Standard Cyborg w2015 The complete developer platform for interacting with 3D data
Pachyderm w2015 Pachyderm is “Git for Data Science.” We offer complete version control for data and give your data science team the same first-class development tools as software developers.
Paperspace w2015 Paperspace is a GPU accelerated cloud platform for individuals, startups, and the enterprise.
ReadMe w2015 ReadMe provides every company the ability to quickly and easily create beautiful documentation, and build loyal and productive developer communities.
Sails Co. w2015 Full-service web, mobile, & cloud studio providing professional support for the Sails framework and the open-source tools we build and maintain.
Yhat w2015 End-to-end data science lifecycle management platform.
Blockstack s2014 Blockstack is a decentralized computing platform. It’s the easiest way to build decentralized apps that can scale.
Flynn s2014 Flynn is an open source Platform as a Service (PaaS)
Algolia w2014 With 50 data centers in 15 regions, Algolia offers a developer-friendly and enterprise-grade search API. Designed to make every search interaction meaningful and rewarding, Algolia serves billions of queries weekly for more than 5,000 customers.
Kimono Labs w2014 Create APIs where they don't exist. With kimono you can quickly extract unstructured data from websites and turn it into clean APIs to use in your applications and services.
Povio w2014 We build software for the best* startups in the world. We do it faster and cheaper than if they would have built it by themselves. Our speciality is that we can start right away. Search Bookface for testimonials from our clients. *YC
Taplytics w2014 Make product decisions driven by your customers: Taplytics is an intelligent customer experience cloud specializing in turning first-time users into lifetime customers through magical moments.
TrueVault w2014 TrueVault is the first data security company entirely focused on protecting consumers' Personal Data for enterprises
Two Tap w2014 Two Tap connects retailers to companies that want to sell their products, in apps or sites, domestic or internationally Two Tap Crossborder is risk-free for retailers and it allows anyone outside of the US to order products from 1000s of US stores
Wit.ai w2014 Natural Language for Developers -- Wit is an API that makes it easy for developers to create apps that you can talk and text to. It turns speech or text into actionable data.
Apptimize s2013 Apptimize lets mobile teams innovate faster to create an amazing user experience. Our tech lets you instantly update your native Android and iOS apps for A/B testing, feature flagging, and changes without having to go through the App/ Play Stores.
CoreOS s2013 Enterprise Linux distribution that dramatically improves security and speed of application deployment.
EasyPost s2013 Shipping API
Estimote s2013 Indoor location API for developers
One Month s2013 One Month's affordable online bootcamps teach people how to code in just one month. Topics include Python, Ruby on Rails, JavaScript, and Front-end Development. For a full list of courses, visit https://onemonth.com/courses.
Bitnami w2013 The App Store for Server Software
Etleap w2013 ETL for Big Data
Fivetran w2013 Data infrastructure as a service
Heap w2013 Heap automatically captures every user interaction in your mobile or web app, letting you generate analytics without writing code or waiting for data.
InfluxData w2013 InfluxData is building the platform for collecting, storing, visualizing, and processing time series data at scale.
Easel s2012 Easel is a visual design tool built for the web. Since the web is viewed in a browser, we believe it should be built in one too.
Plivo s2012 APIs for Voice calls and SMS
Pixate s2012 Mobile application prototyping. Now part of Google.
Rainforest s2012 Dead simple testing. The fastest, easiest way to test your website. Say no to manual QA!
Zapier s2012 Zapier connects hundreds of SaaS apps with customizable workflows via an easy to use editor.
Authy w2012 Authy is a Two-Factor Authentication platform for developers
Flutter w2012 Flutter combined computer vision technology with the built-in webcams in laptops, iPads, smartphones and TVs to let users control these devices with gestures, facial expressions, hints and body-language. Flutter became part of Google in Oct 2013.
Marft w2012 Marft creates embeddable machine learning models for application developers. Users submit data by web/API, and receive optimized models implemented in a language of their choice.
Per Vices w2012 Per Vices Corporation builds software-defined radio (SDR) products. Our Crimson platform provides the flexibility and bandwidth required to support various radio applications used within the infrastructure, defence, and telecommunications industries.
Apollo s2011 We make Apollo, the leading GraphQL implementation. (We are also the team that built Meteor, the JavaScript framework.)
Codecademy s2011 Codecademy teaches the world the skills they need to get the jobs they want.
Segment s2011 Collect, clean, and control your customer data
Citus Data s2011 Real-time. Big data. PostgreSQL
Clutch s2011 An easy to integrate library for native iOS applications designed to help you develop faster and deploy instantly.
Compose s2011 We make it easy to run databases. PostgreSQL, Redis, MongoDB, Elasticsearch, and RethinkDB.
Firebase s2011 App success made simple. An app platform to develop high-quality apps, grow your user base, and earn more money. Acquired by Google.
HackerRank s2011 Programmer IQ
OneSignal s2011 OneSignal provides a simple interface to push notifications. OneSignal lets content creators focus on quality user engagement instead of complex implementation. Our goal is to democratize push communication for everyone.
Parse s2011 Parse is the easiest way to build apps.
Realm s2011 Better data structures = no DB.
Stypi s2011 Realtime collaborative coding
AppHarbor w2011 .NET Cloud Platform as a Service
Mailgun w2011 Email API service.
MemSQL w2011 ANSI SQL-compliant, distributed, in-memory database for real-time analytics
Tumult w2011 Tumult is building the next generation of apps for web design. Our first app is Hype, the HTML5 animation builder for OS X: http://tumult.com/hype/
Upverter w2011 The future of hardware design. A marketplace for hardware engineering labour, component symbols, footprints, 3d models, access to manufacturing and enterprise grade ECAD for designing electronics, all rolled into one.
Docker s2010 App store for server configurations.
PagerDuty s2010 Notify you about server troubles.
Embedly w2010
Optimizely w2010 A/B testing.
Zencoder w2010 Video Encoding API, Open source video player (video.js)
Stripe s2009 Payment processing
Directed Edge s2009 Product recommendations.
Cloudkick w2009
Cloudant s2008 NoSQL Database-aaS. Acquired by IBM in 2014. Now IBM Cloud Data Services
280 North w2008
Heroku w2008
Virtualmin w2007
Clustrix w2006