Fourthline Tech Stack

KYC and AML compliance platform for European fintech and financial services

Financial Services Amsterdam, North Holland 201–500 employees Founded 2017 Privately Held

Fourthline builds identity verification and fraud prevention infrastructure for regulated financial services across Europe. The stack is modern and containerized (.NET Core, Kubernetes, PostgreSQL, RabbitMQ on AWS), but notably shows no recent tech adoptions or replacements — suggesting a period of consolidation rather than architectural shift. Hiring is accelerating across engineering, sales, and legal (with three legal roles open), indicating expansion into new markets and product lines while managing compliance complexity.

Tech Stack 16 technologies

Core StackHubSpot .NET C# Docker RabbitMQ PostgreSQL Angular TypeScript Kubernetes Terraform AWS LinkedIn NET Core ASP.NET Web API xUnit MSTest

What Fourthline Is Building

◆Challenges

Operating in a highly regulated environment
Staying up to date with aml regulatory requirements
Complex multi-threaded deals
Expanding in dach market
Protecting online identities and sensitive data
Scaling in a compliant and sustainable way
Ensuring product market fit
Timeline shortening
Rework reduction
Integration standardization

▲Active Projects

Enterprise opportunities in germany, austria, and switzerland
Maintaining and further developing data protection framework
Bav and qes solutions
Additional services/products
Legal and privacy process development
Account plans for strategic logos
Enterprise opportunity closure in dach
Pipeline development outbound events
Developing legal and privacy processes, templates and tools
Proof of concepts

Hiring Activity

Accelerating20 roles · 15 in 30d

Department

Engineering

Sales

Legal

Product

Seniority

Senior

Mid

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About Fourthline

Fourthline delivers KYC, AML, and fraud prevention solutions for financial institutions and fintech platforms across Europe. The company operates as a modular platform addressing the full customer lifecycle—onboarding, due diligence, and ongoing monitoring—with a focus on balancing regulatory adherence against friction-free user experience. Founded in 2017 and based in Amsterdam, the company serves over a dozen named customers including N26, Qonto, Trade Republic, flatexDEGIRO, Scalapay, and Shine. Current strategic focus centers on expanding into the DACH region (Germany, Austria, Switzerland), developing BAV and QES solutions, and closing enterprise deals while managing the operational burden of multi-threaded sales cycles in highly regulated markets.

HeadquartersAmsterdam, North Holland

Company Size201–500 employees

Founded2017

Hiring MarketsGermany, Netherlands, Spain, United States

Frequently Asked Questions

What tech stack does Fourthline use?

Fourthline runs .NET Core and C# for backend services, Angular and TypeScript for frontend, PostgreSQL for data persistence, RabbitMQ for messaging, and Kubernetes and Terraform for infrastructure orchestration on AWS. Testing uses xUnit and MSTest.

What is Fourthline working on?

Priority projects include enterprise expansion in DACH markets, BAV and QES solution development, legal and privacy process standardization, proof-of-concept work, and outbound pipeline development to close strategic enterprise deals.