Senior JavaScript Security Researcher

ThreatFabric

Senior JavaScript Security Researcher at ThreatFabric exploring and implementing browser-based detection methods. Collaborating with global teams to safeguard millions of users from online fraud.

Posted 7/29/2026full-timeAmsterdam • 🇳🇱 NetherlandsSenior💰 €80,000 - €100,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive experience in JavaScript and framework development, with a strong focus on browser API exploration and fraud detection methodologies. Capable of collaborating with cross-functional teams to enhance fraud detection capabilities and maintain web SDKs.

Highest-signal resume keywords

JavaScript DevelopmentBrowser API FamiliarityOpen Source Development WorkflowDebugging SkillsFraud Detection

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

JavaScriptFramework DevelopmentBrowser APIsFraud DetectionDebugging

Soft Skills

Problem-SolvingCommunication

Tools & Technologies

GitDocker

Industry Keywords

Fraud Risk SuiteWeb SDKThreat Analysis

Tech Stack

Tools & technologies

DockerJavaScriptOpen Source

About the role

Key responsibilities & impact

Explore new browser capabilities, uncover detection methods, and turn cutting-edge research into real-world protection used at global scale.
Maintain our FRS (Fraud Risk Suite) web SDKs.
Drive the new (detection) capabilities of our SDK.
Detect and investigate fraud patterns & trends.
Work closely with Threat Analysts and Product teams to enhance fraud detection.
Explore and experiment with (new and upcoming) browser APIs.

Requirements

What you’ll need

8+ years relevant experience in JavaScript and or framework development.
Familiar with Browser APIs including APIs needed for browser, mouse, keystroke, scroll dynamics.
Able to work with Open Source development workflow using git.
Excellent debugging and problem-solving skills.
Knowledge of Docker is a nice to have.
Proficient English writing skills to document work and communicate project status.

Benefits

Comp & perks

25 Holidays per year
8% holiday allowance (included in annual salary)
A Pension Scheme.
A stimulating and supportive work environment that encourages growth and development.
Flexible Remote / Hybrid work from home options to promote work-life balance.
Flexible working hours.
Active ThreatFabric events and FitFabric bootcamps.
Active knowledge sharing huddles.