1&1 | Germany | 76xxx Karlsruhe | Permanent position | Full time / Home office | Published since: 10.02.2026 on stepstone.de
(Senior) Data Scientist / Data Analyst (m/f/d)
1&1 is one of the leading telecommunications providers in Germany with over 3,100 employees and nearly 16 million customer contracts. With pioneering spirit, unusual ideas and creative teams, we have won a leading market position in mobile and broadband connections. By combining the over 67,000 km long 1&1 fiber optic network and regional networks, we create Germany's most extensive fiber optic network. We also build the most modern 5G network in Europe, based on the new Open-RAN technology. With open interfaces and 5G functions in a powerful cloud infrastructure. We are the stock customers marketing experts - with personalized, data-driven campaigns binding on all contact channels and we develop our customers. Be part of 1&1. .
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Your tasks • Your profile • What we offer
For our section 'Customer Decisioning'' we are looking for an active support. Are you ready to use your expertise? Then you're right with us. We offer you the opportunity to introduce in a dynamic environment your skills for the analysis and design of campaigns as well as product developments and thus advance the sales success in our customer base. As a Senior Data Scientist / Data Analyst (w/m/d) at our location in Karlsruhe, you will work closely with product management, marketing, campaign managers and IT to ensure optimal customer interactions and offers in real time (real time) in our sales channels. Your core tasks include: Analysis and validation of professional requirements of campaigns and product developments as well as their technical and technical design. Construction and maintenance of the technical offer logic for products such as mobile, fixed network etc. Own operational implementation of campaigns in real time (real time) and product developments with the help of our decision support system. Monitoring the professional decisions of campaigns or product offers. Quality assurance of the implementation and support of the operation in the processing of incidents.
Good knowledge of German in word and writing Successfully completed studies of (economic) computer science or comparable IT-related studies. Experience in data analysis and implementation of customer campaigns (ideally in the B2C mass market business, the telecommunications industry or in trade). Good knowledge of SQL and programming languages, such as Python. Ideal, but no need are basic web service knowledge, such as REST/SOAP. willingness to further develop your existing IT skills, including in the form of trainings or the like. Ability to think customer-oriented, anticipate customer needs and analyticalise customer behavior. Embossed communication skills with different stakeholders and at all levels of hierarchy.
Attractive salary Strong community of team players Confidential working time with flexible classification and the possibility of working up to 40% mobile Numerous training options on and offline Discounts on 1&1 products and for various leisure offers In-house restaurant Free drinks and fresh fruit Jobrad grant
Location
 | 1&1 | |
| 76137 Karlsruhe | ||
| Germany |
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