Threat Research Engineer (Client Side)

DataDome delivers real-time bot and agent trust management, giving businesses complete visibility and control over all traffic—human, bot, or AI. Named a Leader in The Forrester Wave™ for Bot And Agent Trust Management Q2 2026, DataDome is trusted by enterprises like Etsy, PayPal, and Soundcloud. Acting as a traffic control plane, DataDome's multi-layered AI engine leverages thousands of models and 5 trillion signals daily to analyze intent and stop fraud in under 2 milliseconds—letting legitimate users through seamlessly across websites, apps, APIs, and MCPs. Backed by a 24/7 SOC and expert threat researchers, DataDome stops 20k+ attacks every second. With 30+ global PoPs, and 80+ ready-made integrations, DataDome is a recognized Leader on G2 across several categories—delivering protection that outperforms. ⭐ About the team: Made up of six subteams (Dashboard, Engine, Infrastructure, Integrations, Threat Research & Security), the DataDome tech team is spread across Europe and the US. We handle over 2 000 billion events per day giving responses within 3ms (99p). We are present in more than 29 data centers around the world, deployed using Docker. We deploy on AWS, Scaleway and GCP, using Docker, Ansible and Terraform, and monitor with Grafana and Prometheus. We handle an average of 8 billion requests per day and manage more than 300 TB of data per month. When it comes to our stack, we run real-time detection layer in Java, low latency Stream Engine running on Flink in Scala, ElasticSearch for storage, Kafka for communication between layers, HAProxy for load balancing, Symfony & Angular for our dashboards. While previous experience in cyber is not a must, we'll pair you with mentors who will help you bridge the gaps. As #growth is part of our DNA, we’ll give you the resources and support you need to develop mastery. You will integrate the Threats Research team which is responsible for constantly improving the detection capabilities through client-side technologies. Your goal will be to challenge and improve our detection capabilities. 👉 Responsabilities: Internal bot detection red team: Challenge our bot detection mechanisms to ensure we properly detect bots. Create tools to automate this process. Help detect bypasses proactively by analyzing different modules as well as potential misconfigurations on our customer websites Improve client-side bot detection: Add new signals to our client-side scripts to collect browser fingerprints capable of detecting advanced bots Improve security and resilience of our JavaScript code by implementing obfuscation techniques to prevent reverse engineering Collaborate with mobile team to collect new signals in our SDK to improve mobile bot detection Research Collaborate with other member of the threat research teams as well as member of other teams to implement new approaches to improve bot detection Communication: Share your results externally using appropriate communication medium, such as meetups, conference talks, academic papers, blog posts 👤 It would be great if you have: At least 5 years of experience programming in JavaScript Strong computer science background Experience dealing with bots or malware Strong knowledge of web and network infrastructures Strong knowledge of web client side technologies A "hacker" spirit Good communication skills (oral and written) Nice to have Previous experience in a Cyber Security company WebAssembly experience Compilers experience What’s in it for you? Flex Life: While we offer remote options our Parisian office is located next to the Opera Garnier. You will also receive a 500€ stipend to help you set up your ideal workspace. If you are full remote, the SNCF dicount card is paid for you to come to our office to visit us & your team monthly! Generous Health Benefits: We have partnered with Kenko for your healthcare needs. A 100€ annual allowance is provided for a leisure activity of your choice in Sports or Culture. Annual allowance of €200 if you come to the office by bike to cover maintenance costs. Professional Development : #Weaimhigh is part of our DNA, therefore we have invested in an internal Learning and Development platform and offer the opportunity to request additional training and support via your manager. Events & Team building: #We care and we have fun! We organise Annual Company-Offsite, Events, Drinks, Winter Party, Lunch & Learns and much more are part of our Culture PTO: Based on the country you are based from (e.g. 25 days in France). What are the next steps? You x Talent Acquisition Manager : first interview and cultural fit You x Engineering Manager : technical and cultural fit + Take-home technical challenge You x Team: Presentation and review of your "technical proposal" with the team You x Member of the leadership team - Discussion about DataDome vision and "raison d'être"! Now you really met everyone! Welcome to DataDome :) DataDome is an equal opportunity employer, and proud to be committed to diversity and inclusion. We will consider all qualified applicants without regard to race, color, nationality, gender, gender identity or expression, sexual orientation, religion, disability or age.