Capacity Testing Engineer, RAN 4G/5G

Why should you choose us? 
Are you interested in working for a Global Leader in E-commerce? Are you excited about working on highly scalable platforms and applications that are accessed by millions of users every day? If so, read on to find out more about the opportunity. Rakuten Symphony is a Rakuten Group company, providing global B2B services for the mobile telco industry and enabling next-generation, cloud-based, international mobile services. Building on the technology Rakuten used 
to launch Japan’s newest mobile network, we are taking our mobile offering global. To support our ambitions to provide an innovative cloud native telco platform for our customers, Rakuten Symphony is looking to recruit and 
develop top talent from around the globe. We are looking for individuals to join our team across all functional areas of our business – from sales to engineering, support functions to product development. Let’s build the future of mobile telecommunications together!  

About Rakuten Rakuten Group, Inc. (TSE: 4755) is a global leader in internet services that empower individuals, communities, businesses and society. Founded in Tokyo in 1997 as an online marketplace, Rakuten has 
expanded to offer services in e-commerce, fintech, digital content and communications to approximately 1.5 billion members around the world. The Rakuten Group has over 27,000 employees, and operations in 30 countries and regions. For more information visit https://global.rakuten.com/corp/. 

What would you do? 
We are seeking a highly skilled and motivated Senior RAN 4G/5G RAN Capacity Testing Engineer to join our dynamic team in Bangalore. In this critical role, you will be instrumental in ensuring the quality, performance, and reliability of our cutting-edge 4G LTE and 5G (NSA and SA) radio access network solutions. You will leverage your expertise in both TDD and FDD technologies, test automation with Python, Kubernetes, and deep log analysis to drive the successful deployment of our cloud-native telco platform. You will design, execute, and 
automate comprehensive test plans, troubleshoot complex issues, and collaborate closely with cross-functional teams to deliver an exceptional mobile experience globally. 

Responsibility: 
• Design and develop test cases and automation scripts for capacity, multi-UE, traffic mix, and call model testing of LTE/NR field scenarios using UE, EPC, and 5GC simulators. 
• Perform rigorous performance, regression, and system integration testing of eNB/gNB software and hardware across lab and field-like environments. 
• Conduct first-level analysis of control-plane and user-plane issues using UL/DL BLER statistics, Layer-2 scheduling behavior, power control, timing advance, and HARQ convergence. 
• Validate 3GPP 32.425 and custom KPIs/PIs, including Availability, Accessibility, Retainability, Integrity, Mobility, and Utilization metrics. 
• Execute capacity and stress testing with impairments applied to fronthaul, midhaul, and backhaul interfaces to assess system robustness and performance limits. 
• Automate capacity and performance test suites, including KPI verification and long-duration monitoring of CPU, memory, and disk utilization. 
• Debug and analyze field data, identify potential issues, and reproduce problems in lab environments for root cause analysis. 
• Utilize Kubernetes (K8s) to deploy, manage, and scale cloud-native test environments and tools, enabling efficient and repeatable test execution. 
• Track test execution progress and defects, perform periodic reviews, and collaborate closely with 
development, SAT, product, and deployment teams to drive issue resolution. 
• Contribute to continuous improvement of testing processes and tools, mentor junior engineers, and actively participate in knowledge sharing and best practices. 
• Design, develop, and maintain automation test frameworks for web services, APIs, and microservices. 
• Execute automated and manual test cases in Linux-based Kubernetes environments. 
• Validate application deployments, configurations, and behavior in Kubernetes clusters. 
• Perform functional, integration, regression, and smoke testing. 
• Automate testing for CI/CD pipelines (e.g., Jenkins, GitLab CI, GitHubActions). 
• Validate containerized applications using Docker and Kubernetes. 
• Collaborate closely with developers, DevOps, and product teams to understand requirements and identify test scenarios. 
• Analyze test results, log defects, track issues, and work with teams for resolution. 
• Perform API testing using tools/frameworks such as REST Assured, Postman, or similar. 
• Support performance, scalability, and reliability testing where required. 
• Ensure test coverage for cloud-native and microservices-based architectures. 
• Contribute to test documentation, test plans, and QA best practices. 
• Automation of functional & capacity testing of EMS, managing 4G LTE and 5G NR RAN nodes deployed on containerized platforms, covering all FCAPS domains (CM, PM, FM, Security, Access Management) 
• Validate south & north bound integration of EMS, ensuring reliable alarm handling, configuration delivery, performance data collection, and software management, ensuring accurate exposure of alarms, KPIs, configurations, and reports through standard interfaces. 
• Utilize Kubernetes for deploying, managing, and scaling complex test environments and associated tools, ensuring seamless test execution. 
• Collaborate closely with development, product management, and field deployment teams to clarify requirements, report defects with clear reproducibility, and verify fixes. 
• Contribute to the continuous improvement of testing processes, methodologies, and tools, advocating for best practices in a cloud-native environment. 

Requirements: 
• Bachelor’s or Master’s degree in Electronics & Communication, Electrical Engineering, Computer Science, Telecommunications, or a related field. 
• Experience of 2–6 years in Capacity and Performance testing for 4G LTE (FDD/TDD) and 5G (NSA/SA FDD/TDD) 
• LTE/NR Knowledge: Strong understanding of LTE/NR architecture, protocol stack (PHY, MAC, RLC, PDCP, RRC, S1AP, X2AP, GTP, SDAP), 3GPP specs, OTA concepts, and key network features (DRX, Paging, Network Slicing, CA, UL CoMP, SON, SPS, RoHC, TTIB, CG, etc.). 
• Testing & Tools: Hands-on experience with UE simulators (TM500, Keysight, JDSU, IXIA) for Capacity/Multi-UE testing, Mobility scenarios, VoLTE/VoNR, LTE/NR features, and Core network testing. 
• Test Design & Execution: Skilled in creating test cases/scripts for capacity, Near field realistic traffic mix, call models, spectral efficiency, scheduler performance, and realistic field scenarios. 
• Debugging & Analysis: Strong debugging skills for both control and data planes 
• Automation & Scripting: Proficiency in Python (test automation, framework design, API testing, data analysis) and familiarity with Java/Perl scripting. 
• Cloud & Tools Management: Experience with Kubernetes for test tool deployment and scalable environments; version control systems like Git; network upgrades, installations, and patches. 
• Traffic & Application Optimization: Familiarity with RTP/RTCP, TCP traffic optimization, and video/application layer performance enhancements. 
• Soft Skills: Flexible, proactive, detail-oriented, able to multi-task, work independently or collaboratively in a global team, with excellent analytical, communication, and problem-solving skills. 
• Professional Attitude: High commitment to delivering robust, high-quality solutions and taking initiative in fast-paced, dynamic environments. 

RAKUTEN SHUGI PRINCIPLES: 
Our worldwide practices describe specific behaviours that make Rakuten unique and united across the world. 
We expect Rakuten employees to model these 5 Shugi Principles of Success. 
• Always improve, always advance. Only be satisfied with complete success - Kaizen. 
• Be passionately professional. Take an uncompromising approach to your work and be determined to 
be the best. 
• Hypothesize - Practice - Validate - Shikumika. Use the Rakuten Cycle to success in unknown territory. 
• Maximize Customer Satisfaction. The greatest satisfaction for workers in a service industry is to see 
their customers smile. 
• Speed!! Speed!! Speed!! Always be conscious of time. Take charge, set clear goals, and engage your 
team.