Series C Developer tools companies in London

IDEs, runtimes, frameworks, and platforms built primarily for engineers. Filtered to Series C-stage companies headquartered in London.

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Ranked by current headcount across Series C Developer tools companies in London. Refreshed daily.

1
Vertice· London, England, United Kingdom
Vertice is the intelligent procurement platform built for the modern enterprise. By uniting agentic workflows, AI-powered insights, and expert buying talent, we enable finance and procurement teams in 100+ countries to operate with greater precision, speed, and impact.Customers use Vertice's platform to review, analyze and negotiate purchases with greater confidence. Vertice processes over $75 billion in spend, with a proven track record of delivering 20%+ savings and accelerating procurement cycles by 2x.Headquartered in London and recognised by the Financial Times as the UK’s fastest growing scale-up, Vertice also operates in New York, Boston, Sydney, Brno, Linz and Johannesburg. Learn more at www.vertice.one.
- Series C
- 526 employees
- Founded 2021
2
Dext· London, England, United Kingdom
Say hello to Dext, the advanced bookkeeping automation platform that eliminates much of the manual work that slows you down.At Dext, we believe that accurate, real-time data is the lifeblood that drives smarter and timely financial decisions and we are committed to empowering businesses, accountants and bookkeepers to thrive through innovative technology that simplifies the accounting process.As the world leader in bookkeeping automation, Dext’s AI is trained on over 1 billion receipts and invoices and extracts financial data with 99.5% accuracy. There’s a reason that over 12,000 bookkeeping and accounting firms and 700,000 businesses like yours trust and rely on us every day for the insights they need to stay healthy and scale.Dext liberates our customers to meet the challenges of today and tomorrow and to focus on what truly matters to them.
- Series C
- 519 employees
- Founded 2010
3
ComplyAdvantage· London, England, United Kingdom
Our mission is to empower every business to eliminate financial crime. By harnessing AI, a unified platform, and an extensive partner ecosystem, we help customers turn compliance into a catalyst for growth, operational resilience, and enduring regulatory trust.More than 3,000 enterprises across 75 countries rely on our end-to-end platform and the world’s most comprehensive financial crime risk intelligence. With full-stack agentic automation, we help organizations automate up to 95% of KYC, AML, and sanctions reviews, cut onboarding times by 50%, reduce false positives by 70%, and handle 7x more work with the same staff.ComplyAdvantage is headquartered in London and has global hubs in New York, Lisbon, Singapore, and Cluj-Napoca. It is backed by Balderton Capital, Index Ventures, Ontario Teachers’ Pension Plan, Goldman Sachs, and Andreessen Horowitz. Learn more about compliance re-engineered for the age of AI at complyadvantage.com.
- Series C
- 506 employees
- Founded 2014
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4
Cognism· London Colney, England, United Kingdom
Cognism provides accurate, compliant-first B2B data and sales intelligence for teams growing across Europe and beyond. Most data looks fine until you try to use it. Contacts change roles. Numbers don’t connect. Prospecting turns into guesswork. Cognism replaces that guesswork with data you can act on. Find the right people, reach them with confidence, and focus on conversations that move deals forward. Our approach is simple: data fluency. Clear, precise, and built to reflect how real go-to-market teams actually work. Trusted by thousands of revenue teams, Cognism helps you turn data into pipeline, without the noise.Please review our current vacancies on here or for more information check out our Careers Page on our website, linked below.
- Series C
- 454 employees
- Founded 2015
5
Swap· London, England, United Kingdom
Swap built the first agentic Storefront that replaces your traditional static website with an immersive agent-led commerce experience, guiding shoppers through product discovery, virtual try-on, and checkout in a single experience.The Storefront captures real-time customer intent, increases conversion, with customers spending 2x more time on site than a traditional website. The agent guides customers through your product catalogue, helps them build outfits for specific occasions, remembers their previous searches, and is always learning about the customer to enhance every subsequent visit the customer makes to the site.Trusted by 700+ brands, Swap helps businesses sell anywhere and scale globally - all from one unified platform.The Future of Commerce Starts Here.🌐 swap-commerce.com
- Series C
- 357 employees
- Founded 2022

6
PhysicsX· London, England, United Kingdom
PhysicsX is a physical AI company on a mission to accelerate innovation and overhaul what engineering and manufacturing look like today. We are building a new software stack to deliver deep AI enablement across the entire engineering lifecycle. PhysicsX partners with leading organizations in aerospace & defense, automotive, semiconductors, materials, and energy, supporting them on some of their most critical and complex challenges. PhysicsX is headquartered in the United Kingdom, with offices in London and New York.We are currently recruiting for multiple positions, however, please only apply for the role that best aligns with your skillset and career goals.
- Series C
- 292 employees
- Founded 2019
7
Leah· London, England, United Kingdom
Leah, formerly ContractPodAi, empowers enterprises to build, orchestrate, and govern intelligent AI agents across legal, procurement, finance, and beyond. Our solution combines advanced AI with deep domain expertise across our core products: Leah Agentic OS and Leah Agentic Contract Lifecycle Management (CLM). Founded on the principle of elevating human judgment rather than replacing it, Leah automates complex workflows, connects data silos, and drives measurable ROI at scale. Our foundation is built on 4 pillars: Lead, Empower, Accelerate, and Harmonize.Lead - Always one step ahead, we bring our customers along with us. We are not followers.Empower - Leah is built from the ground up to empower your employees to do their very best, and never to be bogged down by the system. Accelerate - With your people and our adaptive platform, Leah doesn't just streamline, it accelerates your enterprise's most desirable outcomes.Harmonize - Leah is constantly evolving to bring your people and processes into perfect harmony, ensuring your enterprise moves forward as a unified, unstoppable force.Trusted by global enterprises, Leah gives organizations a competitive advantage through AI-driven automation and operational excellence. Partnerships with leading AI providers including OpenAI, Anthropic, Google, Microsoft, Meta, Cohere, and Mistral strengthen Leah’s technological foundation. With offices spanning London, New York, Dubai, Sydney, Glasgow, Mumbai and Singapore, Leah continues expanding its impact globally.
- Series C
- 252 employees
- Founded 2015
8
inforcer· London, England, United Kingdom
Managing Microsoft 365 tenants no longer needs to be time-consuming and complex. inforcer is a multi-tenant management platform that bridges the gap between MSPs and Microsoft, helping you to become better Microsoft Solutions Partners. Standardize and roll out policies across multiple tenants in seconds, track policy drift, and automatically backup and restore policies on demand. Build upon your teams expertise by becoming a part of our dedicated MSP community and learn from Microsoft experts and your peers. Leverage automation and community support to deliver a truly proactive, valuable service offering on top of Microsoft 365.
- Series C
- 199 employees
- Founded 2022
9
Automata· London, England, United Kingdom
Automata is transforming lab automation for the AI era. We deliver the only fully integrated, AI-ready, easy-to-use platform that is modular, configurable, and open by design. While legacy systems fragment workflows and slow discovery, Automata modernizes lab operations—enabling scientists to program experiments, not robots.Automata is changing how science is done—forever.
- Series C
- 166 employees
- Founded 2015
10
BeZero Carbon· Greater London, England, United Kingdom
Investing in carbon projects is essential to tackling climate change. Independent, risk-based, project level carbon ratings are essential to that investment.BeZero Carbon is a global carbon ratings agency. Our independent ratings, risk tools and datasets equip world-leading organisations with the knowledge and confidence to make better climate decisions. We aim to scale climate impact through carbon markets.
- Series C
- 160 employees
- Founded 2020

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Find engineers at Series C Developer tools companies in London

Searching for “engineers at top Series C Developer tools companies in London” surfaces this slice of the market. The list above ranks Developer tools companies headquartered in London whose latest disclosed round is Series C, by current headcount, drawn from public LinkedIn and Crunchbase records. With 21 matching companies in Refolk’s index, this is a tight read on where the Developer tools talent in London is heating up.

Three filters at once narrows the field hard. The companies that survive all three - Series C, Developer tools, 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 Developer tools’s next operators and angel investors.

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Refolk pulled Developer tools companies headquartered in London whose latest disclosed funding round is Series C 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 11:53:05 GMT

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