Senior JavaScript SDK Engineer

ThreatFabric B.V.

Amsterdam, North Holland, Netherlands
full_time
Posted May 30, 2026

Job Description

Your mission

About the Job 
Title: Senior JavaScript SDK Engineer 
Position: Full-time | 40 hours per week 
Location: Amsterdam, Netherlands | Work From home (2-3 days per week in the office) 
Salary Range: 75.000,- to 90.000,- annually 

As a senior JavaScript researcher & engineer, you’ll be responsible for maintaining our FRS web SDKs. Next to that you’ll be driving the new (detection) capabilities of our SDK. This includes detecting and investigating fraud patterns & trends. You’ll be working closely with Threat Analysts and Product teams to enhance fraud detection. Part of your job is exploring and experimenting with (new and upcoming) browser APIs, and research how these APIs can be used to create new and novel detections mechanism. This requires a creative and out-of-the-box mindset. Proven experience with browser and JavaScript security research is a plus. 

The position 
You should have the ability...