At zerothird (zerothird.com), we’re building the future of secure communications. As a fast-scaling quantum technology company, we specialize in entanglement-based Quantum Key Distribution (eQKD) — the most advanced, physically unbreakable encryption method available today. Based on Nobel-Prize winning research, our systems enable critical infrastructure, telecom providers, and enterprise customers to protect their networks against both today’s threats and tomorrow’s quantum attacks.

We're now hiring a Sales Assistant to join our Vienna office. This role is key in ensuring our sales and operational activities run smoothly and professionally — with a strong focus on supporting our growing customer base and helping close deals.

You’ll provide day-to-day support for the sales team and management — ensuring everything from scheduling and travel to sales documents and event logistics is always under control. This is an ideal position for someone who thrives in a fast-paced tech environment, enjoys coordination, and wants to be close to cutting-edge sales activity.

Sales & Admin Coordination

• Schedule meetings with customers, partners, and internal teams
• Prepare documents for sales calls, including pitch decks, offers, and briefings
• Support follow-ups after meetings to ensure momentum toward closing

Sales Process Support

• Help maintain sales documentation in our CRM tool, including contracts, contact lists, and trackers
• Coordinate timelines and deliverables during ongoing sales cycles
• Assist with lead generation activities (e.g. research, contact preparation, follow-ups)

Travel & Event Planning

• Organize travel logistics for the sales team (flights, accommodation, itineraries)
• Support zerothird’s participation in events, conferences, and trade shows
• Prepare event materials and help coordinate customer demos and meetings

Expense & Office Management

• Track and process travel and business expenses
• Ensure team schedules, tools, and calendars are aligned

• 5+ years of experience in an assistant, coordinator, or sales support role
• Fluent in German and English, both written and spoken
• Great organizational skills and attention to detail
• Tech-savvy and comfortable working with modern digital tools
• Communicative, friendly, and proactive
• Motivation to support high-stakes, high-tech sales processes

• High Impact: Join at the intersection of Nobel-Prize winning quantum physics and secure communications — and help shape solutions that will protect global infrastructure for decades.
• Vibrant Quantum Community: Join a young and ambitious team with a strong spirit of collaboration, regular team-building events, and a shared passion for meaningful tech. Enjoy rooftop coffee breaks overlooking Vienna’s Wienerberg.
• Family-Friendly Workplace: We support flexible schedules and work arrangements to help you balance your professional drive with personal priorities and family duties.
• High-Growth Opportunity: Be part of one of the most exciting sectors in deep tech. As demand for quantum-secure communication accelerates, you'll have the opportunity to shape new markets — and grow with us.
• Inclusive Culture: We believe in "Duz-Kultur”, flat hierarchies, and fast, transparent communication.
• Targeted Onboarding & Learning: You’ll receive a tailored onboarding and a dedicated mentor to help you ramp quickly and succeed. Stay sharp with access to training, coaching, and market insights.
• Extras That Count: Enjoy premium coffee, fresh fruit, team lunches, and summer & holiday events when working from our Vienna HQ.

The minimum gross salary for this position is € 39.333,28 per year (based on full-time employment) according to the collective agreement. However, there is a willingness to offer a higher salary depending on experience and qualifications.

Ready to Apply?

Send your CV and a short motivation letter!

This position is based in Vienna only. We’re reviewing applications on a rolling basis — if you're ready to be at the center of quantum-secure innovation and help make deals happen, we’d love to meet you.