Series B Developer tools companies in San Francisco

Railway’s mission is to build the cloud computing stack that unburdens you, so you can focus more on what matters to you.

• Series B
• 11.4k employees
• Founded 2020

Grammarly stands with Ukraine. We invite you to do the same. Here are some ways you can help: gram.ly/WeStandWithUkraine ---Grammarly is the world’s leading AI writing assistance company trusted by over 40 million people and 50,000 organizations every day. From instantly creating a first draft to perfecting every message, Grammarly helps people at 96% of the Fortune 500 get their point across—and get results—without compromising security or privacy. We believe that great writing gets work done. Grammarly’s product offerings—Grammarly Business, Grammarly Premium, Grammarly Free, and Grammarly for Education—work where you do, delivering contextually relevant writing support across over 500,000 apps and websites. Founded in 2009, Grammarly is No. 7 on the Forbes Cloud 100, one of TIME’s 100 Most Influential Companies, one of Fast Company’s Most Innovative Companies in AI, and one of Inc.’s Best Workplaces. Grammarly offers a dynamic hybrid working model. This approach helps foster trust, innovation, and a strong team culture, with the flexibility of working from home, whenever you need focus time.

• Series B
• 9.8k employees
• Founded 2009

As the global home for all developers, GitHub is the complete AI-powered developer platform to build, scale, and deliver secure software. Over 100 million people, including developers from 90 of the Fortune 100 companies, use GitHub to build amazing things together across 330+ million repositories. With all the collaborative features of GitHub, it has never been easier for individuals and teams to write faster, better code.

• Series B
• 6.8k employees
• Founded 2008

Constructor is the only search and discovery platform designed exclusively for commerce where conversions matter. Our platform delivers unmatched KPI optimization and fast ROI for enterprise ecommerce brands, retailers, distributors, marketplaces, and more — while giving customers a personalized, enjoyable shopping experience. Unlike other platforms, Constructor is the only search and product discovery solution that was built from the ground up with clickstream data and advanced AI, not merely bolted onto a legacy keyword engine. Consistently outperforming competitors in A/B tests, Constructor’s solutions use generative AI and collaborative personalization to deliver compelling user experiences across all aspects of product discovery. From search and browse, to AI Shopping Agents and Product Insights Agents, recommendations, collections, offsite discovery, attribute enrichment, and much more, Constructor covers the entire discovery journey.Optimizing specifically for ecommerce metrics like revenue, conversion rate and profit, Constructor generates consistent $10M+ revenue lifts for our customers, which include some of the world’s most recognized brands, like Sephora, Under Armour, Petco, and many more.Constructor is the only search and discovery vendor named a Leader by Forrester, Gartner and IDC. Want to hear from our customers? See what they have to say about us at G2 or Gartner Peer Insights.Learn more at constructor.com.

• Series B
• 1.4k employees
• Founded 2015

Courier is the customer messaging and notifications platform where your team and AI agents collaborate. Orchestrate notifications, power lifecycle journeys, personalize with AI intelligence, and deliver across email, SMS, push, chat, in-app, Slack, and Microsoft Teams.

• Series B
• 1.2k employees
• Founded 2019