Top Tech Startups in London, United Kingdom in 2026

We're an early stage security startup founded by 2 experienced technical leaders from Tessian (former Head of Eng and former Lead Architect). Our product helps security teams quickly and accurately detect intrusions in their cloud environment using canaries. We're Series A stage and about to ramp up the company from 24 to 32.

Empowering Your Marketing with the Right Talent, Every Time. At Zavops, we’re redefining the way businesses build marketing success. Our platform connects you to a curated network of experts—from full project teams to niche freelancers—across digital marketing, content creation, SEO, branding, and more. Whether you're scaling, optimizing, or seeking fresh talent, our versatile approach bridges the gap between exceptional skills and your unique needs. Join us and discover the future of hiring for marketing excellence.

Nivoda provides jewellery businesses with a simple solution to strengthen profits, increase efficiency and accelerate growth with its B2B diamond marketplace. Designed to save you time and money whilst giving you access to the world’s diamond supply at the best prices with zero inventory risk, Nivoda is trusted by thousands of retailers all over the globe.

Infrawatch is building the world’s first real-time adversary infrastructure intelligence platform - turning the global internet into a live, high-fidelity map of malicious networks, proxies, and command-and-control servers before they’re ever used in attacks. Every day, Infrawatch scans the entire public IPv4 and IPv6 space, generating over 150 million actionable indicators. Our proprietary rule engine and enrichment pipeline transform raw internet telemetry into curated, analyst-ready intelligence that powers fraud prevention, threat detection, and national-scale defence. Existing tools are fragmented: broad but shallow, or narrow but blind. Infrawatch unifies them. We give defenders visibility and attribution across all categories of adversary infrastructure, enabling them to block threats at the infrastructure stage - not after the breach. Our mission is simple but urgent: to be the infrastructure intelligence source of truth that keeps enterprises, governments, and critical systems ahead of adversaries. Built by defenders, for defenders, Infrawatch delivers unmatched coverage, precision, and speed. From cybersecurity giants to government agencies, organisations rely on Infrawatch’s live data feeds, APIs, and platform to identify malicious infrastructure, prevent fraud, and accelerate investigations. We care deeply about clarity: in data, in design, and in purpose. Our analyst-first platform makes billions of events feel effortless to explore, with modern workflows and visualizations that help teams see faster, decide smarter, and act sooner. We’re a small, focused, and remote-first team of engineers and researchers obsessed with quality, performance, and craft. Together, we’re building the backbone of proactive defence, a system that turns chaos into signal and helps the world beat the adversary.

What are we building? Software was supposed to help us. Instead, it swallowed the working day. Everywhere you look people are buried under the burden of software. We are starting with automating email, turning it from a burden into a powerful competitive edge for people who grow businesses and build a reputation in their inbox. Think real estate, consultants, recruiters - people who spend hours on emails, scheduling, and follow ups. Unlike other startups, we're a pure-play applied AI company and not a SaaS company with AI features hastily bolted on. We use the best techniques (fine-tuned open-source models, tool use, and retrieval-augmented generation), and as a result, users send 53% of the email drafts we generate. How has it been going? From $1M to $25M ARR in the last 10 months, making us the fastest growing startup ever in the UK. We are backed by top-tier investors including: Marc Benioff (Founder of Salesforce), Harry Stebbings (Founder of 20VC), Douwe Kiela (Founder/CEO Contextual AI/Creator of RAG), David Singleton (Former CTO of Stripe), Des Traynor (CTO Intercom), Madrona (First Investors in Amazon/Snowflake). What do we value? We're very intentional about adding new people. We believe a small team of exceptional people working hard at a problem they care about will always outperform a larger, more unfocused team. That means you'll need to bring an intensity to this role that might not be expected at other companies but it also means you'll be fast-tracked into roles with greater responsibilities far earlier.

Midas is a platform for composable onchain investment products. It enables strategy managers to turn institutional strategies into compliant tokens that offer investors full transparency, instant redemptions, and native composability across DeFi protocols such as Morpho and Pendle. Midas products are compliant financial instruments that are issued with clearly defined investor rights, onchain transparency, and robust operational controls. Each product’s underlying investment strategy is managed and monitored by appointed strategy managers, such as BlackRock, Hyperithm and M1 Capital, with ongoing oversight of risk parameters and performance. Founded in 2024 by Dennis Dinkelmeyer (formerly Goldman Sachs), Fabrice Grinda (FJ Labs), and Romain Bourgois (formerly Ondo Finance), Midas is backed by leading investors including RRE, Creandum, Framework Ventures, HV Capital, Ledger Cathay and Coinbase Ventures. To date, Midas has powered over $1.7B in asset issuance and paid out $37M in yield.

We are developing an awesome mobile app