Series A SaaS companies in London

Software-as-a-service vendors selling subscription cloud software to other businesses. Filtered to Series A-stage companies headquartered in London.

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Built from a search like: “Top Series A SaaS companies in London”

Ranked by current headcount across Series A SaaS companies in London. Refreshed daily.

1
Prolific· Greater London, England, United Kingdom
Prolific is a technology company building the biggest pool of quality human data in the world—and the ultimate platform to access it.Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from real, engaged participants—with a new study launched every 2 minutes.Prolific has been ranked among the fastest-growing businesses in the Financial Times 1000 in 2025 & 2024 and the Deloitte Technology Fast 50 in 2023.
- Series A
- 1.4k employees
- Founded 2014
2
proSapient· London, England, United Kingdom
proSapient is a cutting-edge expert network and primary research platform that enables professionals to share insights with clients through short calls, online surveys and long-term engagements. Our clients include many of the world’s largest and most respected consultancy and private equity firms, and we have been featured in the Financial Times and in Sifted as one of the 100 fastest-growing businesses in Europe and the UK. Since our launch in 2017, we have revolutionized expert networking by offering new capabilities including the industry’s first AI-powered platform, enabling smarter, faster decision-making. Headquartered in the UK, proSapient is ISO 27001 accredited and employs over 300 people across four global locations: London, Lisbon, Raleigh, and Toronto.Should an opportunity arise where we think your experience could be relevant for an expert call, one of our Client Services Associates will contact you and help to determine whether there is a suitable fit, agree a rate to compensate you for your time and then submit your profile to our client. Our client then decides whether to work with a given expert and should they wish to move forward, our Associate will assist in scheduling a call at a suitable time. We are continuously reimagining the expert networking landscape and remain at the forefront of technological innovation, committed to building the future of knowledge discovery. In recognition of our technological leadership, we've been recognized as a Future Fifty company by Tech Nation.
- Series A
- 536 employees
- Founded 2017
3
Connectd· Greater London, England, United Kingdom
Connectd is a people-first platform connecting startups and scaleups with experienced fractional executives, strategic advisors and directors. Using AI-powered insights and smart matching technology, we ensure the right experts are placed with the right companies, so both sides can grow with confidence. In a world shaped by transformative technology, we provide a human-centred ecosystem where companies access the guidance they need to scale, and senior leaders find meaningful, flexible work that puts their experience to powerful use.Since 2019, Connectd has facilitated over 50,000 connections across the UK and US, helping both sides of the ecosystem succeed: startups and scaleups gain trusted leadership at pivotal moments, and senior leaders and executives build dynamic, rewarding fractional careers.
- Series A
- 507 employees
- Founded 2019
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4
XYZ Reality· London, England, United Kingdom
Delivering high-quality construction projects on time and within budget has never been more complex. With demand showing no sign of slowing down, mitigating risks, avoiding unnecessary costs, and streamlining processes is more important than ever.XYZ Reality is here to help you navigate these complexities. Through real-time project controls and engineering grade augmented realityTM, XYZ Reality empowers teams with unmatched precision and visibility, enabling proactive issue resolution and accelerating project delivery. With real-time, objective field data, teams can effortlessly track on-site progress and quality, helping prevent delays and ensuring projects are delivered on time. Leading developers partnering with XYZ Reality experience faster timelines, reduced construction costs, and enhanced quality assurance. With over $12 billion in mission-critical projects successfully managed, XYZ Reality has helped developers reduce risks, cut costs, and reach the market faster with confidence. At the forefront of construction innovation, XYZ Reality enables companies to drive faster revenue generation, improve sustainability, and deliver exceptional project quality. Learn more at www.xyzreality.com.
- Series A
- 370 employees
- Founded 2017
5
Threecolts· London, England, United Kingdom
Threecolts is redefining business by acquiring and bundling software, offering marketplace and retail operations capabilities at a lower price.Tens of thousands of customers—including some of the fastest growing brands, Fortune 500 enterprises, and global agencies—are using Threecolts to grow faster, lower costs, and become more agile.
- Series A
- 345 employees
- Founded 2021

6
Beam· London, England, United Kingdom
Beam is a social enterprise bringing AI to welfare services, trusted by over 100 government partners. Enabled by tech and AI, our expert caseworkers have supported thousands of underserved people into homes and jobs, while our software has slashed admin for thousands of frontline workers.Funded by the Mayor of London and the world's top tech entrepreneurs, Beam is transforming how the world supports those left behind. Beam’s award-winning work has been covered widely in the media, including by the BBC, The Times, The FT, The Independent, Evening Standard, Sky, Time Out and others. Beam were also named one of London’s Top 10 Startups by WIRED magazine, Top 15 UK Startups by LinkedIn, and feature regularly on The Escape 100.
- Series A
- 338 employees
- Founded 2017
7
Badoo· London Colney, England, United Kingdom
A pioneer in modern dating since 2006, with one of the world's largest and most geographically diverse communities, Badoo is a freemium service, which offers additional premium subscriptions to members.
- Series A
- 299 employees
- Founded 2006
8
Flawless· London, England, United Kingdom
Pioneering Assistive AI tools for the film and TV industries. Built to protect artistic rights, real performances, and human authorship.
- Series A
- 262 employees
- Founded 2018
9
Dastgyr· London, England, United Kingdom
Dastgyr is a B2B e-commerce marketplace connecting buyers to sellers across the world. We are re-engineering the conventional retail business with empowering technologies and innovative supply-chain solutions to help businesses grow faster.Dastgyr's Buyer app allows business owners to purchase a wide assortment of products from various local and international sellers at competitive prices with reliable, doorstep delivery, all with a few clicks from their smartphones. Dastgyr's Seller app enables suppliers of all sizes to upload their inventory, manage their orders, and ultimately, increase their overall throughput.Our business thrives in the FMCG, Construction, Chemicals, and Agricultural Goods verticals.We are on a mission to build the biggest B2B e-commerce solution for emerging markets worldwide.
- Series A
- 238 employees
- Founded 2020
10
Hutch· London, England, United Kingdom
Hutch has been voted one of the Best Places to Work in the gamesindustry.biz awards for the last 3 years in a row! Since inception in 2011, we've entertained over 300 million mobile players across game titles including Rebel Racing, F1® Clash, Top Drives, and Hot Wheels: Race Off. We’re dedicated to growing the racing genre on mobile, and enabling communities of players worldwide to celebrate their passion for cars. People make games, and our people are the heart and soul of Hutch. We’ve created a work environment that we’re proud of and enjoy spending time in. As a team, we work together and play together. We take on creative and technical challenges to make great games and have fun along the way.Teams at Hutch have the freedom and responsibility to make the best decisions for the players, and we are committed to making their working lives as easy and as simple as possible.We’ve created an award-winning culture for our 100+ world-class team members, housed in our main studio in Shoreditch, London, with wider studios situated in Dundee and Canada. In December 2020 Hutch was acquired by Modern Times Group (MTG) to further accelerate opportunities to build highly diverse automotive experiences on mobile.
- Series A
- 210 employees
- Founded 2011

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Find engineers at Series A SaaS companies in London

Searching for “engineers at top Series A SaaS companies in London” surfaces this slice of the market. The list above ranks SaaS companies headquartered in London whose latest disclosed round is Series A, by current headcount, drawn from public LinkedIn and Crunchbase records. With 276 matching companies in Refolk’s index, this is a tight read on where the SaaS talent in London is heating up.

Three filters at once narrows the field hard. The companies that survive all three - Series A, SaaS, in London - are usually the most targeted recruiting pool a hiring manager can ask for. Senior engineers, founding designers, and product leads here are about to become SaaS’s next operators and angel investors.

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Refolk pulled SaaS companies headquartered in London whose latest disclosed funding round is Series A from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 3 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 19:37:12 GMT

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