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Flagstone Tech Stack

UK cash management platform aggregating 65+ savings accounts

Financial Services London 201–500 employees Founded 2013 Privately Held
flagstoneim.com LinkedIn

Flagstone operates a multi-bank savings aggregation platform with 75,000+ clients and £19bn in assets under administration. The tech stack is heavily Microsoft-centric (Sentinel, Defender XDR, Azure, Entra ID) and security-focused, underpinned by modern frontend tooling (React, TypeScript, Jest). Current hiring is almost entirely sales-driven (11 of 15 open roles), signaling aggressive channel expansion and adviser network growth — consistent with pain points around IFA channel penetration and referral volume scaling.

Tech Stack 30 technologies

Core StackTerraform Workday Xero QuickBooks Figma Salesforce Power BI Python JavaScript React TypeScript InVision Jest Cypress Storybook React Native Microsoft Sentinel Defender XDR Azure Defender for Cloud Azure Azure Entra ID Bicep PowerShell Salesforce Marketing Cloud LexisNexis Purview React Testing Library Trustpilot

What Flagstone Is Building

◆Challenges

  • Expanding ifa channel
  • Barriers to referral
  • Increasing referral volume
  • Reducing onboarding friction
  • Hardening azure environment
  • Deepening presence with advisers
  • Reaching £15bn aua in under three years
  • Building growth engine
  • Evolving proposition
  • Delivering meaningful change across the business

▲Active Projects

  • Quarterly penetration test programme
  • Detection and response capability
  • Microsoft sentinel deployment
  • Ai governance framework development
  • Llm integration deployment
  • Microsoft 365 security posture management
  • Partner engagement strategy
  • New firm development model
  • Channel strategy allocation
  • Systematic outbound sales capability

Hiring Activity

Accelerating15 roles · 15 in 30d

Department

Sales
11
Security
2
Engineering
1
Finance
1

Seniority

Mid
8
Lead
2
Senior
2
Director
1
Junior
1
Manager
1

Notable leadership hires: Relationship Team Lead, Sales Team Lead

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About Flagstone

Flagstone is a UK savings platform allowing clients to consolidate, manage, and diversify cash across 65+ partner banks through a single interface. The product supports Instant Access, Fixed Term, ISA, and other account types, and serves wealth managers, corporate & SME clients, high-net-worth individuals, and charities. At 201–500 employees and headquartered in London, the company is pursuing ambitious growth targets (£15bn AUA within three years) while actively hardening its Azure security posture and deploying AI governance frameworks and LLM integrations.

HeadquartersLondon
Company Size201–500 employees
Founded2013
Hiring MarketsUnited Kingdom

Frequently Asked Questions

What tech stack does Flagstone use?

Azure infrastructure (Entra ID, Sentinel, Defender XDR), Salesforce (including Marketing Cloud), Power BI, React/TypeScript frontend, Python backend, Terraform/Bicep IaC, and Workday for HR. Heavy emphasis on Microsoft security tooling.

What is Flagstone working on?

Security hardening (Sentinel deployment, Microsoft 365 posture management, penetration testing), AI governance and LLM integration, IFA/adviser channel expansion, referral strategy, and growth model refinement to reach £15bn AUA.

How this profile is built

Flagstone's technology stack, projects, and hiring signals are inferred from public hiring and company data — career pages, public listings, and company web presence — then clustered and de-duplicated. Figures are estimates that refresh over time. Read our full methodology →

This is not an official vendor or customer list. It is a technology-adoption signal inferred from public data, intended for B2B research.