Senior Mobile Network Performance Engineer (w/m/d)

These are your tasks

Drives evidence-based analysis of mobile network performance across 4G and 5G, translating KPI, benchmark, crowdsourcing, field, and customer-experience signals into clear technical findings, improvement proposals, and fix validation. The role supports the end-to-end Performance → Action → Validation cycle across mobile domains. 

• Analyze mobile network performance across 4G/5G with focus on customer-impacting KPIs such as accessibility, retainability, mobility, latency, throughput, voice quality, and service reliability.
• Identify performance gaps using multiple inputs, including benchmarking results, crowdsourcing, field measurements, network KPIs, probes, and customer-experience data.
• Convert performance findings into clear technical hypotheses, prioritized actions, and expected KPI impact.
• Perform cross-domain performance engineering across RAN, Core/IMS, transport, roaming, and device-related behavior from an end-user perspective.
• Support technical deep dives on major topics such as voice quality, data reliability, latency, handover/mobility, TCP continuity, and national roaming performance.
• Define and follow up performance validation plans for feature activations, software upgrades, parameter changes, and special network events.
• Audit whether proposed fixes from Architecture, Operations, or vendors are likely to solve the observed issue and validate the outcome after implementation.
• Support the creation of performance dashboards, engineering views, and management summaries with clear linkage between KPI behavior and customer impact.
• Contribute to automation of recurring analysis, KPI correlation, and performance reporting workflows.
• Provide technical support for benchmarking and QoS/QoE topics where deep domain analysis is needed.

Your skills

• Completed university degree in Telecommunications Engineering, Electrical Engineering, Computer Science, Engineering Informatics, or a comparable technical field.
• At least 7–10 years of professional experience in mobile network engineering, performance engineering, optimization, or benchmarking, ideally within a mobile network operator, telecom vendor, or closely related industry.
• Strong knowledge of LTE and 5G NR network performance, including accessibility, retainability, mobility, latency, throughput, voice quality, and service continuity.
• Solid understanding of RAN KPIs, feature impact, capacity and mobility behavior, and the relationship between technical KPIs and customer experience / QoE.
• Experience in analyzing performance using multiple data sources such as network KPIs, field measurements, benchmarking, crowdsourcing, probes, and customer-experience indicators.
• Good understanding of end-to-end mobile service behavior across RAN, Core/IMS, transport, roaming, and device-related impacts.
• Experience in cross-functional technical collaboration with engineering, operations, architecture, vendors, and other stakeholders.
• Ability to translate technical findings into clear recommendations, priorities, and management-ready conclusions.
• Strong analytical and problem-solving skills with a structured, evidence-based, and result-oriented working style.
• Confident communication skills and ability to challenge assumptions constructively in cross-domain environments.
• Strong English skills, both written and spoken; German is an advantage.

Our benefits

• Attractive salary
• Strong community of team players
• Trusted working hours with flexible scheduling and the possibility of working mobile up to 40%
• Numerous further training opportunities online and offline
• Discounts on 1&1 products and various leisure activitie
• Free drinks and fresh fruit
• Job-bike subsidy