Security Researcher

This is a fully remote position, open to applicants in Bulgaria.

📋 Description

• Conduct research on browser, WebView, Android, and iOS environments from an attacker's viewpoint.

• Discover new security signals, behavioral indicators, and technical patterns to enhance detection of fraud, abuse, automation, and AI agents.

• Examine attacker methodologies involving bots, browser automation, AI agents, emulators, device spoofing, hooking, instrumentation, remote access tools, and anti-detection strategies.

• Design and execute experiments to compare legitimate, automated, AI-assisted, and manipulated environments.

• Assess signals for reliability, stability, susceptibility to spoofing, privacy considerations, performance impact, and production viability.

• Convert research insights into SDK feature specifications for web and mobile data gathering.

• Develop internal tools, scripts, and lab setups for signal research and validation.

• Collaborate with SDK, engineering, product, and detection teams to transition research from theory to production.

⛳️ Requirements

• A minimum of 3 years of practical experience in security research, mobile security, browser research, fraud detection, reverse engineering, or a related technical field.

• Proficient with web browsers, mobile browsers, WebViews, browser APIs, JavaScript runtime behavior, browser automation, fingerprinting, client-side web security, and low-level browser technologies.

• Knowledgeable about modern open-source browsers and rendering engines such as Chromium, WebKit, Blink, or Gecko.

• Experience with native Android and/or iOS applications, mobile OS behavior, app instrumentation, emulators, device spoofing, mobile automation, mobile security, and low-level platform APIs.

• Solid understanding of attacker tactics involving automation, AI agents, spoofing, and anti-detection methods.

• Capability to identify technical signals and convert them into detection or data collection opportunities.

• Proven experience in designing technical experiments and validating research hypotheses.

• Familiarity with SDK development languages and environments such as TypeScript/JavaScript, Kotlin/Java, or Swift/Objective-C.

• Proficient in scripting, preferably using Python.

• Ability to work autonomously on ambiguous challenges and communicate findings effectively to engineering, product, and research stakeholders.

• Experience with Web SDKs, Mobile SDKs, client-side telemetry, device intelligence, behavioral signals, AI agent detection, or fraud detection products.

• Background in researching bots, credential stuffing, scraping, headless browsers, AI-assisted automation, app cloning, SDK abuse, phishing kits, malware, or anti-detection frameworks.

• Experience with reverse engineering Android or iOS applications.

• Familiarity with detection quality measurement, feature evaluation, false-positive analysis, production monitoring, or machine learning principles.

• Bachelor's degree in Computer Science, Cybersecurity, Data Science, or a related discipline, or equivalent practical experience.

🏝️ Benefits

• Security: thoroughly vetted clients to reduce risks and guarantee reliable and timely payments.

• Career support and assistance in finding new opportunities if a project is not suitable.

• Legal support related to independent contractor or sole proprietorship status, taxes, and associated processes.

• English language courses.

• Opportunities for professional development.

• Team-building activities.

• Flexible working hours.

• Comprehensive financial and legal support for independent contractors.

• Complimentary English classes with native speakers or Ukrainian educators.

• Dedicated HR assistance.

• People-first management style with minimal bureaucracy.

• Supportive company culture.