Top Developer Tools Startups in North America

AssemblyAI is a remote-first company building powerful AI models for developers, startups, and enterprises to transcribe and understand their audio data. Our mission is to make production-ready, state-of-the-art AI models accessible to developers and product teams at extremely large scale through simple APIs. Customers, including Spotify, Algolia, Dow Jones, Happy Scribe, BBC, The Wall Street Journal, and NBCUniversal, use our APIs to transcribe and understand millions of videos, podcasts, phone calls, and zoom meetings every day. Our APIs power innovative products like conversational intelligence platforms, meeting summarizers, content moderation, and automatic closed captioning. We're growing at breakneck speed, and recently announced our Series B round. We've raised $63M in total funding, backed by leading investors including Insight Partners, Accel, Y Combinator, Patrick and John Collision (Founders of Stripe), Nat Friedman (Former CEO of GitHub), and Daniel Gross (Entrepreneur & Investor in companies including GitHub, Uber & SpaceX). Our team is made up of problem solvers, innovators, and top AI researchers from companies like DeepMind, Google Brain, Meta AI, Amazon and Apple. They conduct cutting-edge AI research and develop novel algorithms and techniques to continually push the state-of-the-art in speech recognition and NLP. Join our world-class, remote team and help us build an iconic deep learning company!

Stripe is a software platform for starting and running internet businesses. Millions of businesses rely on Stripe’s software tools to accept payments, expand globally, and manage their businesses online. Stripe has been at the forefront of expanding internet commerce, powering new business models, and supporting the latest platforms, from marketplaces to mobile commerce sites. We believe that growing the GDP of the internet is a problem rooted in code and design, not finance. Stripe is built for developers, makers, and creators. We work on solving the hard technical problems necessary to build global economic infrastructure—from designing highly reliable systems to developing advanced machine learning algorithms to prevent fraud.

Flox is dedicated to making developers more productive across every stage of the software development life cycle by unleashing the power of Nix. Nix is an open source package manager with over 100,000 users that enables developers to manage environments and packages as code. We're on a mission to grow the Nix community and share Nix with the enterprise world by making it easier to learn, deploy, and scale. We build SaaS products to help enterprises use Nix to install packages, manage development and production environments, build software, and deploy consistently across Mac, Linux, and embedded devices.

Topsort is the leading AI and Auction-based retail media global company, transforming retailers and marketplaces into top ad networks on par with industry giants. Through seamless integration, Topsort provides a comprehensive Bidless™ retail media tech stack featuring highly flexible API tools, an industry-leading privacy-safe clean room with robust online and in-store attribution, and a transparent ad network for streamlined media buying across multiple ad networks. In just three years since launch, Topsort has raised $38 million in funding from investors like Pear Ventures, Quiet Capital, FJ Labs, and Upload Ventures.

Most backends were designed for a world where humans read every line of code before it shipped. Today, though, software is being written by developers and their agents together. Codebases are growing faster than any team can review them and the assumptions that used to hold everything together are quietly eroding. Convex was built to solve that. Convex is a reactive backend platform where correctness is the default, for humans and agents alike. Transactions are ACID so concurrent writes never corrupt data, everything is TypeScript end to end so a hallucinated field name is a build error not a production incident, and sync and caching are automatic so there's no glue code to subtly rot. The guarantees engineers used to enforce by reading every line, the platform enforces instead. We're a small, in-person team in San Francisco who care deeply about what we're building and who we're building it with. Application demands are changing faster than the infrastructure underneath them, and defining what the right platform looks like for this new world is still the domain of very talented humans. We want you to be one of them.

Contentful, the leading content platform for digital-first business, helps over 30% of the Fortune 500 and thousands of brands around the world create and manage digital experiences for their customers across any channel. It enables greater speed and scale than traditional CMS solutions. Contentful unifies content in a single hub, structures it for use in any digital channel, and integrates seamlessly with hundreds of other tools through open APIs. Companies such as Gucci, Plaid, Goodrx, Intercom, Notion, Staples and many others rely on Contentful’s platform. For more information, visit contentful.com.

AI-powered digital experiences to automate client onboarding & risk assessment

Better data leads to more performant models. Performant models lead to faster deployment. We help deliver value from AI investments faster with better data by providing an end-to-end solution to manage the entire ML lifecycle.

Our product is webhook-as-a-service and our customers are developers. We want to make it as easy as possible for developers to integrate webhooks into their services, and to scale and maintain reliability for our customers as they grow.

ReadMe makes your developer documentation beautiful, interactive, and personalized. With ReadMe, build developer portals that combine support, tutorials, topical guides and API exploration. ReadMe makes it trivial to keep docs up-to-date and has community oriented features that help drive adoption. Try it free for 14-days. No credit card required. ReadMe.com