Fathom London

What Fathom London does

Fathom London is a bespoke software consultancy that designs and builds custom software products, with a stated specialisation in user experience and interface design for the financial services and fintech sectors. The firm operates as an integrated team of architects, designers, and engineers that immerses itself in client engagements from initial concept through delivery, and it publicly emphasises legacy software modernisation and the creation of user-friendly interfaces as core use cases. Its underlying technology stack is not publicly disclosed; the offering is positioned as full-lifecycle custom software development rather than a packaged product, and no proprietary platform, APIs, or SDKs are referenced.

The company is headquartered at 35-37 Ludgate Hill in London with a North American office at 31 West 34th Street in New York, employs between 11 and 50 people, and has been operating for over a decade. Revenue is generated through project-based and retainer professional services engagements sold via direct, consultative enterprise sales. Named clients include Commerzbank, Currency Group, Arqit Quantum Digital, Access Fintech, BMLL Technologies, vFunction, and several cryptocurrency companies. The firm has no disclosed venture capital or private equity backing, no parent company, no M&A history, and no public leadership-team disclosures in the source material.

The company is privately held, independently operated, and does not list patents, certifications, regulatory licences, or AI/ML capabilities. Marketing is largely referral- and case-study-driven via its website, and the firm offers no self-serve product, mobile application, or developer-facing API. Fathom's website content is current as of 2025, and the firm claims that during 2022 its engagements contributed to clients achieving more than $228 million in funding, although this is a client outcome metric rather than a measure of Fathom's own revenue.

Name

Fathom London

Legal name

Fathom

Website

https://fathomlondon.com

Company type

Private

Founded year

2015

Operating status

Operating

Headcount range

11–50 employees

Short description

Fathom London is a bespoke software consultancy with 11-50 employees, headquartered in London with a New York office, that designs and builds custom software and user experiences for financial institutions, fintechs, crypto companies, and adjacent technology clients on a project and retainer basis.

Ownership category

akta.pro rank

Product category

Software Consulting

NAICS

Custom Computer Programming Services (541511), Computer Systems Design and Related Services (54151), Computer Systems Design Services (541512)

SIC

Services-Prepackaged Software (7372)

akta.pro primary industry

Integration, API & Middleware Consulting (BPAHAEAJ)

Keywords

• Bespoke software development
• Financial software consulting
• User experience design
• Enterprise software services
• Legacy software modernization

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D

Revenue model

1. Software Consulting and Development Services: Fathom provides bespoke software solutions on a project and retainer basis, helping companies solve complex business problems through custom software development. The company works collaboratively with clients from concept through creation, indicating a services-based revenue model.

Go-to-market motion1 record

Distribution channels1 record

Core offering

Fathom London is a bespoke software consultancy that designs, engineers, and delivers custom software solutions for clients in the finance and technology industries. They work collaboratively with clients from concept through creation, combining architecture, design, and engineering to produce elegant, user-friendly interfaces and to modernize legacy systems. Their work spans platforms for fintech, cryptocurrency, and large financial institutions, including quantum-safe distribution tools and mortgage-industry platforms.

Product overview

Fathom London offers bespoke software solutions as a custom software development consultancy. Their services span the entire product development journey from concept through creation, encompassing software architecture, design, and engineering. They specialize in solving complex business problems for companies in the finance and technology industries, helping clients achieve funding goals and create modern tools that replace legacy systems. The offering is a unified service model rather than a packaged software product with distinct modules.

Differentiator

Problem solved

Functional benefit

Products and services

• Bespoke Software Solutions

Quantifiable outcome

• $228 million+ in client funding achieved in 2022 alone

Named customers7 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators2 records

Recent moves4 records

Expansion highlights3 records

Direct peers

• Netguru: Globally distributed bespoke software and product design consultancy with significant fintech and enterprise practice; comparable in service model, technology focus, and target verticals.
• Red Badger: London-based bespoke software consultancy delivering custom digital products to enterprise clients in finance and adjacent sectors - a direct UK peer operating in Fathom's home market.
• thoughtbot: US-headquartered product design and bespoke software consultancy with a similar small-team, design-led model serving fintech and enterprise clients - directly comparable in offering and engagement style.
• ustwo: Digital product studio with strong fintech and financial-services client base; competes head-to-head with Fathom in delivering beautifully designed bespoke software for finance brands.
• Koto Studio: Boutique brand and digital product studio known for high-craft bespoke software for fintech and challenger banks - directly comparable target clients and design-first ethos.
• Ginetta: Italian-headquartered digital product consultancy blending design and engineering for financial and enterprise clients - very comparable to Fathom in offering, scale, and craft-led positioning.

Broad incumbents

• AKQA: Global digital design and innovation agency serving financial-services enterprise clients; overlapping capability set but operates at much larger scale across broader industries.
• Endava: Public digital engineering services firm with a major financial services practice - competes for the same bank and fintech modernisation budgets as Fathom but at far greater scale and geographic reach.
• Deloitte Digital: Big Four digital transformation arm that delivers bespoke software alongside its wider consulting portfolio; competes with Fathom for enterprise financial-services modernisation mandates.

Emerging players

• Heed: Smaller London-based digital product and software studio focused on design-led bespoke builds for fintech and impact-driven startups; overlaps with Fathom's niche of beautifully designed finance-grade software.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat2 records

Key risks6 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Fathom London