(Senior) Software Developer (m/w/d) .NET

As a subsidiary of 1&1 AG, IQ-Optimize Software GmbH stands for innovative software and IT services. The focus is on IT security, business process optimization and media design. IQ-Optimize's core competencies include the development of tailor-made software applications and the provision of customized IT infrastructures. 1&1 AG counts with around 16 million. Customer contracts and 3,200 employees to the major telecommunications providers in Germany. The company offers its customers a comprehensive portfolio of broadband connections and mobile rates - complemented by attractive added value applications such as smart home solutions, IPTV, video on demand and online storage.

Our long-term team, consisting of members of different ages and backgrounds, is looking for reinforcement. Look forward to interesting tasks in a dynamic working environment: Active development of our internal CRM and workflow management systems Participation in the development, improvement and expansion of the backend systems Participation in all phases of the software development cycle, including architectural decisions Identification and implementation of improvements in quality, performance and wartability Implementation of code reviews to ensure software quality

For this position, you will ideally bring the following conditions and knowledge: Complete computer science study or comparable training and relevant professional experience Knowledge of C#, SQL and relevant technologies such as RESTful and SOAP web services Knowledge ASP.NET MVC, Angular, JavaScript, Bootstrap or CSS would be advantageous Safe handling of large amounts of data and experience in performance optimization are desirable An effective way of working with high quality standards on work results Since our documentation and business language is German, we must require good German language skills (at least B2-level), good English skills are helpful At the end of 2025, the Maintal office site is moving into a new, modern office building in Frankfurt (East).

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 Free drinks and fresh fruit Jobrad grant

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