Prelude
Founding Device Fingerprinting Engineer
Paris, France, Remote. Posted 7 months ago
The role
You will own the fingerprinting roadmap, including architecture, research, and production systems. You will build systems to collect and process device and network signals to feed a real-time scoring engine.
What you will do
- Owning the fingerprinting roadmap end to end
- Building and hardening device fingerprinting systems
- Developing network intelligence signals
- Applying ML to fingerprinting problems
- Integrating with the real-time scoring engine
- Researching attacker techniques
- Laying the groundwork for a team
Required qualifications
- 5+ years of experience in a relevant field such as fraud detection, bot mitigation, mobile security, or detection engineering
- Deep knowledge of device fingerprinting including mobile hardware signals, OS-level attestation, browser fingerprinting APIs, and spoofing/emulation detection
- Hands-on experience with network intelligence including TLS fingerprinting, IP enrichment pipelines, proxy/VPN classification, AS number analysis, and carrier-level signals
- Applied ML experience in a security context
- An adversarial mindset
- A preference for simple, robust designs over clever, fragile ones
- Fluent English
Nice to have
- Familiarity with phone/SIM authentication context, GSMA intelligence, or telco APIs
- Experience with JA4 or other network fingerprinting techniques
- Proficiency in Go, Rust, or Python for backend/data work
- Experience with stream processing systems (SQS, Kafka) or OLAP stacks (ClickHouse, Redshift)
- iOS or Android SDK internals knowledge
- Published research, open-source contributions, or technical writing in the fraud/bot detection space
Benefits
- Competitive compensation package with BSPCEs
- Flexible remote policy
- 100% travel to the office subsidised
- Health insurance via Alan
- Urban Sports Club gym membership
- Laptop and a phone for on-call rotations
- Swile meal vouchers
- Free snacks and drinks in the office
- An annual offsite in a great location
About the company
Prelude is redefining how companies authenticate and onboard users. Founded in 2022 by former Zenly team members, the team of 60 is based in Paris.