{"id":4087707,"url":"https://alion.io/job/iq-optimize-software-senior-softwareentwickler-c-net-wmd","title":"Senior Softwareentwickler C# .NET (w/m/d)","company":{"id":3900983,"name":"IQ-optimize Software","domain":"iq-optimize.de","url":"https://alion.io/company/iq-optimize-software","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Frankfurt am Main, Germany"],"countries":["DE"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"ASP.NET Core","optional":false},{"name":"Bootstrap","optional":false},{"name":"C#","optional":false},{"name":"JavaScript","optional":false},{"name":"Rest API","optional":false},{"name":"SOAP","optional":false},{"name":"SQL","optional":false}],"status":"live","first_seen_at":"2026-11-06T16:09:08Z","employer_posted_date":null,"last_verified_at":"2026-11-06T16:09:08Z","board_verified":false,"closed_at":null,"days_open":5,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":5},"description":"Als Tochtergesellschaft der 1&1 AG steht die IQ-Optimize Software GmbH für innovative Software- und IT-Dienstleistungen. Im Fokus stehen die Bereiche IT-Sicherheit, Geschäftsprozess-Optimierung und Mediendesign. Zu den Kernkompetenzen von IQ-Optimize zählt zudem die Entwicklung maßgeschneiderter Software-Anwendungen sowie die Bereitstellung kundenindividueller IT-Infrastrukturen. Die 1&1 AG zählt mit rund 16 Mio. Kundenverträgen und 3.100 Mitarbeitenden zu den großen Telekommunikationsanbietern in Deutschland. Das Unternehmen bietet seinen Kunden ein umfassendes Portfolio von Breitband-Anschlüssen und Mobilfunktarifen an - ergänzt um attraktive Mehrwert-Anwendungen wie Smart Home-Lösungen, IPTV, Video-On-Demand und Online Storage.\n\nIhre Aufgaben\nUnser langjährig eingespieltes Team sucht Verstärkung an den Standorten Frankfurt am Main oder Krefeld. Freuen Sie sich auf interessante Aufgaben in einem dynamischen Arbeitsumfeld.\n\n Aktive Weiterentwicklung unserer internen CRM- und Workflow-Management-Systeme\n Mitwirkung an der Entwicklung, Verbesserung und Erweiterung der Backend-Systeme\n Teilnahme an allen Phasen des Softwareentwicklungszyklus, einschließlich architektonischer Entscheidungen\n Identifizierung und Umsetzung von Verbesserungsmöglichkeiten hinsichtlich Qualität, Leistung und Wartbarkeit\n Durchführung von Code-Reviews zur Sicherstellung der Softwarequalität\n\nDas wünschen wir uns\n Abgeschlossenes Informatik-Studium oder eine vergleichbare Ausbildung\n Mehrjährige Berufserfahrung in der Softwareentwicklung\n Fundierte Kenntnisse in C#, SQL und relevanten Technologien wie RESTful und SOAP- Webservices\n Kenntnisse in ASP.NET MVC, JavaScript, Bootstrap und CSS wären von Vorteil\n Sicherer Umgang mit großen Datenmengen und Erfahrung in der Performance-Optimierung\n Eine effektive Arbeitsweise mit einem hohen 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