Top Tech Startups in London, United Kingdom in 2026

BTCAAS Consultants is an IT consulting and technology services company focused on helping businesses build, modernize, and operate reliable technology environments. We deliver practical solutions across cloud infrastructure, Windows and Linux platforms, virtualization, backup and recovery, IT service management, automation, security, and digital transformation. Our approach combines strong technical delivery with a clear focus on business outcomes, operational stability, cost efficiency, and continuous improvement. We work closely with customers to understand their challenges, design scalable solutions, and support day-to-day technology operations. At BTCAAS, we encourage ownership, collaboration, continuous learning, and knowledge sharing. Our teams work across multiple technology towers, enabling engineers to expand their skills while contributing to real-world infrastructure, cloud, support, and transformation initiatives. We are committed to building trusted client relationships and creating opportunities for technology professionals to learn, grow, and make a meaningful impact.

Resonate Pulse is a SAAS platform that enables our enterprise clients to monitor and action customer feedback real-time, where it happens, when it happens. Both in the front-line and the strategy teams we help re-shape the business. We make sure to put the end-customer front and centre, and help create that differentiatior every business needs.

Askria leverages real-time feedback, machine learning and human experts to make smarter decisions faster.

Data Theorem is a leading provider in modern application security. Its core mission is to analyze and secure any modern application anytime, anywhere.

Sigma is SaaS, next-generation business intelligence and data exploration platform that is disrupting the analytics landscape. Sigma offers a spreadsheet-like interface that enables all decision makers to securely analyze up to billions of rows of live data with the unlimited scale and speed of the cloud. Sigma is backed by Sutter Hill Ventures which brought Sumo Logic, Pure Storage and Snowflake to IPO. Simply speaking, Sigma connects to the cloud warehouse of the users, shows the selected tables in the spreadsheet form, lets them do aggregation, filtering, sorting and editing, and then provides the necessary tools to create visualizations and build dashboards.