Top Tech Startups in London, United Kingdom in 2026

dunnhumby is the world’s leading customer science company. They analyse data and apply insights from more than 660 million shoppers across the globe to create personalised customer experiences in digital, mobile, and retail environments. dunnhumby's strategic process, proprietary insights, and multichannel media capabilities build loyalty with customers to drive competitive advantage and sustained growth for clients. dunnhumby employs nearly 3,000 experts in offices throughout Europe, Asia, Africa, and the Americas and works with a prestigious group of companies including Tesco, The Kroger Co., Coca-Cola, Macy's, Procter & Gamble, and PepsiCo. The company was founded in 1989 and is headquartered in London. It operates as a subsidiary of Tesco Stores, Ltd.

At Envo, we’re making it easier (and way more rewarding) for people and companies to take real climate action. Our platform helps teams track meaningful sustainable actions, earn rewards, and build a culture that actually cares — all powered by AI for Good. We believe impact should be visible, shared, and celebrated — not buried in a PDF report. That’s why we’ve built Envo to be intuitive, inspiring, and rooted in real-world change. We’re a small, passionate team on a big mission: to make sustainability feel personal, actionable, and joyful. If you're excited about the future of work, tech with purpose, and building a better planet — come join us. Let’s make doing good the new normal.

Clubb is an all-in-one platform helping ambitious food and fitness creators build the next generation of membership businesses - backed by AI and built to scale.

At Astonsys, we are a results-driven software testing and quality assurance company committed to helping businesses deliver flawless digital experiences. Founded with a vision to bridge the gap between development speed and product quality, we specialize in providing reliable, scalable, and cost-effective testing solutions to startups, SMEs, and enterprises worldwide. With over a decade of combined industry experience, our team brings deep expertise across functional testing, automation, API testing, performance testing, and security validation. We understand that in today’s fast-paced digital landscape, quality is not optional—it’s a competitive advantage. That’s why we integrate seamlessly into your development lifecycle, ensuring faster releases without compromising stability or performance. At Astonsys, we don’t just test software—we partner with our clients to understand their business goals, user expectations, and technical challenges. This enables us to design tailored QA strategies that reduce risks, improve product reliability, and enhance customer satisfaction. Our approach is proactive, data-driven, and aligned with modern agile and DevOps practices. We leverage industry-leading tools and frameworks to build robust automation solutions that accelerate testing cycles and optimize costs. Whether it’s a one-time project, ongoing QA support, or a full-scale testing partnership, we are equipped to deliver measurable outcomes. What sets us apart is our commitment to transparency, quality, and long-term relationships. We believe in clear communication, quick turnaround times, and delivering beyond expectations. Our clients trust us not just as a service provider, but as a strategic quality partner. As technology continues to evolve, Astonsys remains dedicated to innovation, continuous improvement, and helping businesses launch with confidence.