Our key contacts

Sebastian Witzmann

Board | Corporate Strategy and Organizational Development

Sebastian Witzmann is an entrepreneur by conviction. For many years, he has founded and developed IT companies and guided them through growth, crises, and profound changes.

As a board member, he shapes the strategic development of rising systems, the expansion of partnerships, and the further development of the organization. He has been dealing with machine learning for years and today applies AI extensively in practice. His studies in law and an MBA complement his entrepreneurial experience and long-standing engagement with agile working methods such as Scrum and Holacracy. As a lecturer in innovation and computer science, he combines practical experience with new ideas and technological knowledge.

Studies in Law & Master of Business Administration

Certifications / Further Training: Scrum Master II, Professional Agile Leadership, Prince2, Professional Scrum with Kanban, Professional Scrum Product Owner III, Professional Scrum with UX, Scaled Professional Scrum, Computer Science, Professional for Usability and User Experience, Trainer for IT Specialists, IHK Examiner for IT System Salespeople, Holacracy

Jeanne Witzmann

Circle Lead People | Personnel and Organizational Development

Jeanne Witzmann combines psychological expertise with modern HR work. As Circle Lead People, she shapes central people topics at rising systems – from recruiting and personnel development to the further development of collaboration. In doing so, she contributes to building strong teams and creating an organization where people can take responsibility and develop further.

As a graduate psychologist and Master of Human Resource Management, she brings solid expertise for working with people and organizations. Further training as a Scrum Master, Professional Scrum Product Owner, and Professional Scrum with UX, as well as her experience with Holacracy, connect people competence with agile working methods and user-centered development. Her experience in digital publishing adds practical experience in the digital environment to her profile.

Graduate Psychologist & Master of Human Resource Management

Certifications / Further Training: Scrum Master, Professional Scrum Product Owner, Professional Scrum with UX, Holacracy

Helene Riemer

Circle Lead Sales & Marketing | Sales & Partner Management

Helene Riemer supports clients and partners at rising systems from the initial needs clarification through consulting and workshops to proposal creation and project implementation. Her focus is on the sales of complex software projects. In doing so, she translates requirements into clear next steps and keeps clients, partners, and project teams on track.

As a Product Owner and Professional Scrum Master, she is familiar with both sales consulting and agile implementation. Her business administration studies with foreign languages, international sales experience, and her language skills in Russian, English, and French support collaboration with clients and partners across borders. 

Study of Business Administration

Certifications / Further Training: Scrum Master

Eberhard Riße

Chairman of the Supervisory Board

Eberhard Riße combines many years of legal experience with a clear view of legal, economic, and contractual contexts. He has been practicing as a lawyer since 1992 and has been working at the law firm RFK since 1995. Since 2009, he has been a specialist lawyer for tenancy and residential property law. His other areas of focus include receivables management, national and international debt collection, supporting creditors in insolvency proceedings, as well as contract law and general terms and conditions.

As the Chairman of the Supervisory Board, he brings this perspective into the independent support and control of the corporate development of rising systems. His experience helps to carefully categorize complex legal questions, economic interests, and potential risks. He speaks German and English.

Dr. Rainer Gith

Member of the Supervisory Board | Entrepreneur, Investor, and Business Lawyer

Dr. Rainer Gith combines legal expertise in business law with many years of entrepreneurial practice. He advises founders, investors, and medium-sized companies on company formation, corporate transactions, and financing issues. At the same time, he has co-founded, developed, and invested in technology companies.

In his supervisory board work, he brings this perspective on strategy, financing, and corporate development. This complements the oversight of rising systems with solid experience at the intersection of law, capital, and entrepreneurship.

Luiz Fernando Mendonça

Board Member | CTO | Technology and ERP

Luiz Mendonça combines solid software development with extensive experience in ERP processes. His focus areas range from PeopleSoft and Oracle to SAP and Odoo, as well as from financial processes and supply chain to integrations, data migration, and custom extensions.

As an AI expert and Lead Architect of RISOC.AI, he designs sophisticated technological solutions. His international career has taken him through Brazil and Italy; he has been active in Germany for many years. He has implemented complex ERP projects, led teams, and trained users. His further education includes Odoo Functional, Scrum, and UX.

Studying Computer Science

Certifications / Further Education: Sarbanes-Oxley (SARBOX), SAP ABAP/4 Expert, Peoplesoft Developer, Odoo Functional, Hyperion Planning, JDEdwards Enterprise One,Scrum Master, Professional Scrum with UX, Holacracy

Irada Iskenderova

Authorized Signatory | Circle Lead Backoffice | Finance & Operations

Irada Iskenderova combines international banking and leadership experience with commercial and IT expertise. Before her transition to IT, she worked in banking and was responsible for customer service, the sales of banking services, and personnel planning. Her studies in applied mathematics add an analytical perspective to this profile. 

At rising systems, she leads the back office circle as a proxy with the areas of Finance and HR. She ensures that central commercial and organizational processes function reliably. As an IT system saleswoman and with her further training as a financial accountant at Endriss, she combines process and system understanding with solid financial knowledge. 

Studies in Applied Mathematics & Business Administration (Banking)

Certifications / Further training: HR Professional, Financial Accountant (Endriss)

Carsten Will

Circle Lead Sales & Marketing | Marketing Director

Carsten Will combines strategic brand management with extensive experience in international marketing communication. In senior agency roles, he was responsible for global campaigns for brands such as Porsche Motorsport, Braun, and Gauloises. He built international teams and led complex projects across various disciplines and channels.

At rising systems, Carsten is responsible for marketing and communication. He makes complex software and technology solutions understandable, sharpens the brand presence, and connects content, campaigns, and partner communication. His business administration studies with a focus on marketing and sales, as well as his experience as a trainer and IHK examiner for marketing communication, combine strategic perspective with solid practical knowledge. 

Study of Business Administration

Certifications / Further Education: Leadership Skills, Mentoring, IHK Examiner, Trainer for Marketing Communication Professionals