Senior Big Data / Mobile Security Engineer (Telecom Domain) (Ashburn)

Senior Big Data / Mobile Security Engineer (Telecom Domain) Mobius Wireless Solutions Ltd. | Ashburn, VA | Full-time, On-siteAbout Mobius Wireless SolutionsMobius Wireless Solutions Ltd. is a global leader in mobile telecom revenue assurance and fraud management (RA/FM) solutions. Trusted by mobile network operators worldwide, our platform including flagship products Gatekeeper and DataSentry tackles pressing industry challenges such as OTP and SIM Box Bypass, CLI Manipulation, OTT tunneling, and other network fraud. By leveraging AI and advanced Machine Learning, we deliver robust fraud detection, quality of service, and traffic monitoring as a service, creating measurable value and maximizing ROI for our clients.About the RoleWe're hiring a Senior Big Data / Mobile Security Engineer to join our team on-site in Ashburn, VA. In this role, you'll design and build scalable big data solutions that power our fraud and revenue assurance platforms, while also analyzing mobile application behavior particularly around OTP-based authentication to identify bypass vulnerabilities and strengthen telecom revenue and security. You'll work with large-scale telecom datasets to detect anomalies, improve system performance, and partner with cross-functional teams to integrate advanced analytics and Machine Learning into our service offerings.Key ResponsibilitiesDesign, develop, and maintain scalable big data applications using Apache SparkBuild and optimize data pipelines in Java and Python for large-scale data processingAnalyze mobile application behavior with a focus on OTP workflows, authentication mechanisms, and security controlsIdentify signatures in OTP implementations and recommend improvementsWork with telecom datasets for analytics and fraud detectionPerform ingestion, transformation, and processing of structured and unstructured dataTune Spark jobs for performance, scalability, and reliabilityCollaborate with security, network, and product teams to enhance our RA/FM platformsApply mobile debugging, network traffic analysis, and reverse engineering tools as neededTroubleshoot issues, support product implementations, and uphold data engineering and security best practices across the development lifecycleRequired Qualifications5+ years of experience in big data engineering, mobile security, or a closely related fieldStrong hands-on experience with Apache SparkProficiency in Java and PythonExperience with distributed data processing and ETL pipeline developmentSolid understanding of mobile application behavior and authentication flows, especially OTP systemsPrior experience in the telecommunications domainFamiliarity with telecom technologies such as GSM, LTE/4G, 5G, and messaging systems (SMS/OTP)Experience handling large-scale telecom data for analytics, monitoring, or fraud detectionStrong grasp of Object-Oriented Programming (OOP) principles and the full software development lifecycleBachelor's or Master's degree in Computer Science, Engineering, or a related fieldStrong analytical and problem-solving skills, attention to detail, and the ability to thrive in a collaborative team environmentPreferred QualificationsExperience with big data ecosystems such as Hadoop, Hive, and KafkaFamiliarity with mobile security testing tools, network sniffing, and debugging techniquesExposure to fraud detection systems or cybersecurity frameworksUnderstanding of data modeling and workflow orchestration tools (e.g., Airflow)