Top Tech Startups in United Kingdom in 2027

C3.ai is a leading enterprise AI software provider for accelerating digital transformation. The proven C3 AI Suite provides the comprehensive services to build enterprise scale AI applications 40x to 100x faster than alternative approaches. The core of the C3 AI Suite is a revolutionary, extensible, model-driven abstraction layer that dramatically enhances data scientist and application developer productivity. The C3 AI Suite supports any value chain in any industry with pre-built, configurable, high-value AI applications for predictive maintenance, fraud detection, sensor network health, supply network optimization, energy management, anti-money laundering, and customer engagement. c3.ai

Klaviyo (NYSE: KVYO) is the B2C CRM. Powered by its built-in data platform and AI, Klaviyo combines marketing automation, analytics, and customer service into one unified solution, making it easy for businesses to know their customers and grow faster. Klaviyo (CLAY-vee-oh) helps over 183,000 brands like Mattel, Glossier, Daily Harvest, and Liquid Death deliver 1:1 experiences at scale, improve efficiency, and drive revenue.

MongoDB is the leading modern, general purpose database platform, designed to unleash the power of software and data for developers and the applications they build. Headquartered in New York, MongoDB has more than 15,000 customers over 100 countries. The MongoDB database platform has been downloaded over 60 million times and there have been more than one million MongoDB University registrations.

Serving 20 trillion feature flags daily, LaunchDarkly helps development teams innovate faster by transforming how they deliver software to customers. LaunchDarkly isn’t just a leader in feature management — it’s the first scalable feature management platform. Feature management allows development teams to innovate faster by fundamentally transforming how software is delivered to customers. With the ability to gradually release new software features to any segment of users on any platform, DevOps teams can standardize safe releases at scale, accelerate their journey to the cloud and collaborate more effectively with business teams. Today, LaunchDarkly deploys peaks of 20 trillion feature flags each day, and that number continues to grow. Founded in 2014 in Oakland, California by Edith Harbaugh and John Kodumal, LaunchDarkly has been named on the Forbes Cloud 100 list, InfoWorld’s 2021 Technology of the Year list, an

LILT is a language translation services and technology company. We're building the next generation of localization, making it possible for every organization to communicate with their customers in the language of their choice through LILT's high-quality, scalable, and affordable translation services. We recruit the world's best human translators and equip them with our software, allowing them to translate better and faster than ever. By combining human expertise and machine efficiency in a complete enterprise localization solution, we can deliver technology-enabled translation services to our customers. Lilt is backed by some of the world's leading investors including Sequoia Capital, Intel Capital, and Redpoint. Our customers include some of the largest Fortune 500 companies in the world who rely on Lilt every day to provide more personal customer experiences in 300+ languages. Our team is headquartered in the Bay Area with additional hubs in Indianapolis, Washington DC, Berlin, Dublin, and the UK.

NextRoll is a leading marketing technology company that empowers businesses to drive sustainable growth while building trusted connections with their audiences. Built on nearly two decades of AI and data expertise, NextRoll delivers its solutions through AdRoll, its flagship brand and connected advertising platform. The AdRoll platform brings together two powerful offerings: the AdRoll product, which helps brands generate awareness, deepen engagement, and drive measurable revenue through AI-powered multi-channel campaigns; and AdRoll ABM, a full-funnel account-based marketing product that unifies buyer insights, predictive AI, and multi-touch advertising to accelerate pipeline and revenue for B2B teams. Together, these solutions give marketers the clarity, efficiency, and performance they need to grow with confidence. NextRoll is a privately held company headquartered in San Francisco, CA.

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!

Humaans is the fastest way to onboard and manage your staff. It turns complex processes like employee onboarding, offboarding, and compensation management into simple workflows by integrating with other point solutions, such as Gsuite, Slack, Docusign, and Greenhouse. We're building a new kind of employee management system designed to help People Ops, Finance, and IT teams operate collaboratively by using the best in class point solutions they want for their staff while maintaining a central record of employee data. How do we get there? By focusing relentlessly around customers’ needs and their experience, and prioritising design, quality and performance.

Tray.io is a low-code, cloud-first approach to automation. We've built a scalable, resilient, and secure platform that transforms fragmented process into powerful business outcomes. Using the Tray platform, organizations can connect their entire cloud stack using APIs, and thanks to a visual workflow builder, customers can easily create automations that drive their business processes using clicks or code. Our focus is currently on the automation and integration of cloud software, but our bigger goal is to build a platform that is use-case agnostic and supports creating all kinds of software. Our challenge is to build a cutting edge product that is powerful and complete while also being beautiful and easy to use.

Hi! I'm Benji, the Co-Founder and CEO at Ashby. At Ashby, we're improving the productivity of working professionals with intelligent and powerful software. We put a lot of effort into designing products that are approachable to beginners but mastered & extended by power users. In many ways, spreadsheets set the bar here. Our first products provide talent teams with clever automation, powerful analytics tools, and customizable workflows packaged in great UX. We haven't launched publicly, but we have many paying customers who love us and use us every day like Opendoor, Airtable, Duolingo, and Notion. Notion's Head of Talent said Ashby is "probably the tool we are in the most and rely on the most, as a recruiting team." Our culture is motivated by Abhik's (my co-founder and Head of Engineering) and my belief that a small talented team, given the right environment, can build a great product and service fast (and work regular hours!). We hire exceptional people and provide an environment where we can be happy, feel challenged, and do our best work. We are well funded and backed by great investors, including Y Combinator, Elad Gil, and Lachy Groom. We'll share more once we meet!