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About zerothird

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.

To accelerate our market growth, we're seeking a Technical Pre-Sales Engineer who understands both the world of IT security and the practical challenges of modern networking. You'll act as a key interface between customers, partners, and our internal product development team - shaping the next generation of quantum-secure infrastructure.

Key Responsibilities

As a Technical Pre-Sales Engineer, you will work closely with our sales and engineering teams to understand customer needs, design high-level secure network architectures, and ensure our quantum products are integrated effectively.

You will collaborate directly with customers, partners, and integrators to align on technical concepts and translate these into concrete solution designs. Your insights from the field will also help steer our product roadmap to meet real-world demands.

Solution Design & Architecture

• Translate customer requirements into scalable and secure eQKD-based network designs
• Define integration strategies for QKD with classical IT security and telecom infrastructure
• Lead technical workshops and discussions with CISOs, network architects, and system integrators

Pre-Sales Engagement

• Collaborate with account managers to provide technical expertise throughout the sales process
• Create technical proposals, white papers, and architectural documentation
• Deliver presentations and live demos that communicate technical value clearly and credibly

Product Feedback Loop

• Capture detailed customer feedback, pain points, and functional requirements
• Work with the product and R&D teams to evolve our offering based on field input
• Identify patterns across use cases and recommend roadmap adjustments

We seek

• 5+ years of experience in a technical pre-sales, systems engineering, or solution architect role
• Strong understanding of IT security, cryptographic concepts, and enterprise networking (firewalls, VPNs, SD-WAN, PKI, etc.)
• Familiarity with secure communication architectures and network design principles
• Strong communication skills in German and English, capable of engaging both business and technical audiences
• Ability to work across teams, align diverse stakeholders, and simplify complexity
• Experience working with critical infrastructure, telecoms, or public sector clients is a plus
• Bonus: familiarity with quantum technologies or interest in learning fast

Our offer

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 € 4.359,91 per month (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!

We're reviewing applications on a rolling basis. If you're ready to help bring quantum-secure networks to life - and want to shape real-world architectures that matter - we'd love to meet you.