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.
\nTo 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.
\n\nKey Responsibilities\nAs 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.
\nYou 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.
\nSolution Design & Architecture
\nPre-Sales Engagement
\nProduct Feedback Loop
\n\n\nWe seek\n
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.
\nVibrant 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.
\nFamily-Friendly Workplace: We support flexible schedules and work arrangements to help you balance your professional drive with personal priorities and family duties.
\nHigh-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.
\nInclusive Culture: We believe in “Duz-Kultur”, flat hierarchies, and fast, transparent communication.
\nTargeted 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.
\nExtras That Count: Enjoy premium coffee, fresh fruit, team lunches, and summer & holiday events when working from our Vienna HQ.
\nThe minimum gross salary for this position is € 61.038,74 per year (full-time basis) in accordance with the collective agreement, plus commission.. However, there is a willingness to offer a higher salary depending on experience and qualifications.
\n\n
📩 Ready to Apply?
\nSend your CV and a short motivation letter!
\nWe’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.
\n\n","employmentType":"FULL_TIME","hiringOrganization":{"@id":"https://quantumtechnologies.career.softgarden.de","url":"https://quantumtechnologies.career.softgarden.de","logo":"https://pcw-cdn.softgarden.de/uploads/quantumtechnologies/de/widget/header/design/image_4wv3x3wlibqwl30?timestamp=1685539846336","name":"zerothird GmbH","@type":"Organization","sameAs":"https://quantumtechnologies.career.softgarden.de","industry":"Other"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","postalCode":"-","addressRegion":"Wien","streetAddress":"-","addressCountry":"Österreich","addressLocality":"Wien"}}}},{"@type":"DataFeedItem","dateModified":"2026-04-30T05:14:17.000Z","item":{"@type":"JobPosting","title":"Product Assurance Engineer (all genders)","url":"https://quantumtechnologies.career.softgarden.de/jobs/60784242/Product-Assurance-Engineer-all-genders-/","datePosted":"2026-04-17T16:59:06.837+02:00","identifier":{"name":"Quantum Technology Laboratories GmbH","@type":"PropertyValue","value":60784242},"description":"Join Our Mission to Advance Quantum Communication in Space\nAt Quantum Technology Laboratories GmbH (qtlabs), we are at the forefront of innovation in optical and quantum-based communication technologies. Our team develops cutting-edge quantum key distribution (QKD) systems and optoelectronic solutions for space and terrestrial applications. Based in Vienna, our center of excellence drives technological advancements that secures communication around the world.
\nQuantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees!
\n\nThe Role\nAs product assurance (PA) engineer, you are supporting projects and other activities aimed to realize successful QKD systems by ensuring that the materials, mechanical parts, processes, software, and electrical components used are fit for purpose over the entire life of a mission. You will be part of engineering teams to help fail-proofing our designs and align development activities with relevant requirements. Within the role, you will help guide the team through the challenges of procurement and MAIT phases.
\n\nKey Responsibilities\nThe minimum gross salary for this position is € 3.284,86 per month (based on full-time employment) in accordance with the collective agreement. However, there is a willingness to offer a higher salary depending on experience and qualifications.
\nQuantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees!
\nWe look forward to receiving your application!
\n\n","employmentType":"FULL_TIME","hiringOrganization":{"@id":"https://quantumtechnologies.career.softgarden.de","url":"https://quantumtechnologies.career.softgarden.de","name":"Quantum Technology Laboratories GmbH","@type":"Organization","sameAs":"https://quantumtechnologies.career.softgarden.de","industry":"Consulting und R&D","logo":"https://pcw-cdn.softgarden.de/uploads/quantumtechnologies/de/widget/header/design/image_4wv3x3wlibqwl30?timestamp=1685539846336"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","postalCode":"-","addressRegion":"Wien","streetAddress":"-","addressCountry":"Österreich","addressLocality":"Wien"}}}},{"@type":"DataFeedItem","dateModified":"2026-04-30T05:14:17.000Z","item":{"@type":"JobPosting","title":"Cyber Security Architect – Space & Ground (all genders)","url":"https://quantumtechnologies.career.softgarden.de/jobs/61598757/Cyber-Security-Architect-%E2%80%93-Space-Ground-all-genders-/","datePosted":"2026-04-21T17:09:31.374+02:00","identifier":{"name":"Quantum Technology Laboratories GmbH","@type":"PropertyValue","value":61598757},"description":"Join Our Mission to Advance Quantum Communication in Space\n\n\nThe Role\nAs a Cyber Security Architect – Space & Ground, you play a key role in shaping the security architecture of next-generation satellite missions. You define, evaluate, and ensure compliance with high-assurance cybersecurity requirements across both space and ground systems.
This role requires deep expertise in security engineering, applied cryptography, and satellite communication or navigation systems. You work closely with internal teams, external partners, subcontractors, and international authorities.
Required Qualifications:
\nNice to have:
\nAt Quantum Technology Laboratories GmbH (qtlabs), we are at the forefront of innovation in optical and quantum-based communication technologies. Our team develops cutting-edge quantum key distribution (QKD) systems and optoelectronic solutions for space and terrestrial applications. Based in Vienna, our center of excellence drives technological advancements that secures communication around the world.
\nQuantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees!
\n\nThe Role\nWe are expanding our team and are looking for a motivated engineer to drive the next generation of our Quantum Key Distribution (QKD) payloads for space applications. You will contribute across multiple projects, working at the intersection of quantum technologies, electronics, and thermo-mechanical engineering. If you are excited about bringing cutting-edge quantum communication into orbit, this role is for you.
\n\nKey Responsibilities\nThe minimum gross salary for this position is € 3,499.78 per month (based on full-time employment) in accordance with the collective agreement. However, there is a willingness to offer a higher salary depending on experience and qualifications.
\nQuantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees!
\nWe look forward to receiving your application!
\nWe are expanding our team and are looking for a motivated systems engineer to drive the development of our next-generation Optical Ground Stations (OGS) for space-based Quantum Key Distribution (QKD). In this role, you will work at the interface of free-space optics, precise tracking of satellites (LEO, GEO), quantum detection systems, and system-level engineering.
\nOur ground stations integrate high-performance optical subsystems, telescopes, fine-tracking sensors, adaptive optics system, beacon lasers and our state-of-the-art Quantum Receiver, designed for ultra-low-noise single-photon detection, active polarization compensation, and high-rate key generation. If you are excited about building real-world infrastructure for long-distance quantum communication, this role is for you.
\n\nKey Responsibilities\nThe minimum gross salary for this position is € 3,499.78 per month (based on full-time employment) in accordance with the collective agreement. However, there is a willingness to offer a higher salary depending on experience and qualifications.
\nQuantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees!
\nWe look forward to receiving your application!
\n\n\n","employmentType":"FULL_TIME","hiringOrganization":{"@id":"https://quantumtechnologies.career.softgarden.de","url":"https://quantumtechnologies.career.softgarden.de","name":"Quantum Technology Laboratories GmbH","@type":"Organization","sameAs":"https://quantumtechnologies.career.softgarden.de","industry":"Consulting und R&D","logo":"https://pcw-cdn.softgarden.de/uploads/quantumtechnologies/de/widget/header/design/image_4wv3x3wlibqwl30?timestamp=1685539846336"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","postalCode":"-","addressRegion":"Wien","streetAddress":"-","addressCountry":"Österreich","addressLocality":"Wien"}}}},{"@type":"DataFeedItem","dateModified":"2026-04-30T05:14:17.000Z","item":{"@type":"JobPosting","title":"Kubernetes Infrastructure Engineer – QKD Systems | zerothird (m/w/d)","url":"https://quantumtechnologies.career.softgarden.de/jobs/63259734/Kubernetes-Infrastructure-Engineer-%E2%80%93-QKD-Systems-%7C-zerothird-m-w-d-/","datePosted":"2026-04-03T17:23:12.431+02:00","identifier":{"name":"zerothird GmbH","@type":"PropertyValue","value":63259734},"description":"Position Overview:\n
zerothird GmbH is seeking a highly skilled Kubernetes Infrastructure Engineer to join our innovative team in Vienna, focusing on the development and maintenance of software infrastructure for our cutting-edge Quantum Key Distribution-as-a-Service offerings. Focus of this role is in crafting and operating secure, efficient, and reliable software infrastructures to ease customer QKD adoption. We particularly welcome applications from women to further increase diversity among us.
\n\nCore Responsibilities:\nzerothird GmbH leads the field in quantum cryptography, based in Vienna and specializing in polarization-entanglement-based Quantum Key Distribution (eQKD). Our proprietary technologies, including the world’s most efficient entangled photon source, enable unmatched secure communication capabilities over both short and long distances. As the only provider of a fully connected eQKD network accommodating up to 20 users, we are committed to redefining the standards of quantum communication security and reliability.
\n\nOur Offer:\n\n
The minimum gross salary for this position is €3.378,48 per month (full-time basis) in accordance with the collective agreement, plus commission.. However, there is a willingness to offer a higher salary depending on experience and qualifications.
\n📩 Ready to Apply?
\nSend your CV and a short motivation letter!
\n\n","employmentType":"FULL_TIME","hiringOrganization":{"@id":"https://quantumtechnologies.career.softgarden.de","url":"https://quantumtechnologies.career.softgarden.de","logo":"https://pcw-cdn.softgarden.de/uploads/quantumtechnologies/de/widget/header/design/image_4wv3x3wlibqwl30?timestamp=1685539846336","name":"zerothird GmbH","@type":"Organization","sameAs":"https://quantumtechnologies.career.softgarden.de","industry":"Other"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","postalCode":"-","addressRegion":"Wien","streetAddress":"-","addressCountry":"Österreich","addressLocality":"Wien"}}}},{"@type":"DataFeedItem","dateModified":"2026-04-30T05:14:17.000Z","item":{"@type":"JobPosting","title":"Software Engineer - QKD Systems | zerothird (m/w/d)","url":"https://quantumtechnologies.career.softgarden.de/jobs/63420859/Software-Engineer---QKD-Systems-%7C-zerothird-m-w-d-/","datePosted":"2026-04-11T15:38:06.647+02:00","identifier":{"name":"zerothird GmbH","@type":"PropertyValue","value":63420859},"description":"About zerothird\nZerothird GmbH lead the field in quantum cryptography, based in Vienna and specializing in polarization-entanglement-based Quantum Key Distribution (eQKD). To accelerate our market growth, we’re seeking a highly skilled Software Engineer to join our innovative team in Vienna, focusing on the development and maintenance of software for our cutting-edge Quantum Key Distribution (QKD) systems. This role is instrumental in crafting secure, efficient, and reliable software solutions that enhance the performance and security of our QKD product. We particularly welcome applications from women to further increase diversity among us.
\n\nKey Responsibilities\nThe minimum gross salary for this position is €3.378,48 per month (full-time basis) in accordance with the collective agreement, plus commission.. 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!
\n\n","employmentType":"FULL_TIME","hiringOrganization":{"@id":"https://quantumtechnologies.career.softgarden.de","url":"https://quantumtechnologies.career.softgarden.de","logo":"https://pcw-cdn.softgarden.de/uploads/quantumtechnologies/de/widget/header/design/image_4wv3x3wlibqwl30?timestamp=1685539846336","name":"zerothird GmbH","@type":"Organization","sameAs":"https://quantumtechnologies.career.softgarden.de","industry":"Other"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","postalCode":"-","addressRegion":"Wien","streetAddress":"-","addressCountry":"Österreich","addressLocality":"Wien"}}}},{"@type":"DataFeedItem","dateModified":"2026-04-30T05:14:17.000Z","item":{"@type":"JobPosting","title":"Head of IT & Security Operations (all genders) ","url":"https://quantumtechnologies.career.softgarden.de/jobs/63436284/Head-of-IT-Security-Operations-all-genders-/","datePosted":"2026-04-12T15:27:05.240+02:00","identifier":{"name":"Quantum Technology Laboratories GmbH","@type":"PropertyValue","value":63436284},"description":"Join Our Mission to Advance Quantum Communication in Space \nAt Quantum Technology Laboratories GmbH (qtlabs), we are at the forefront of innovation in optical and quantum-based communication technologies. Our team develops cutting-edge quantum key distribution (QKD) systems and optoelectronic solutions for space and terrestrial applications. Based in Vienna, our center of excellence drives technological advancements that secures communication around the world.
\nQuantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees!
\nBuild and defend the IT backbone of a growing deep-tech scale-up.
\nWe are looking for a technically strong, pragmatic and resilient Head of Technology Operations & Security. You will design, implement, operate and continuously improve the IT and security backbone of a fast-growing, security-critical organization.
\nYou will lead a small internal IT team and ensure that operational IT, security requirements and business priorities are aligned. The role sits at the intersection of operational IT execution and strategic governance requirements, translating security, compliance and management objectives into practical, scalable and secure IT operations while providing operational leadership and maintaining a hands-on understanding of the systems you are responsible for.
\nThis role combines operational IT leadership with strong technical credibility. You are expected to lead and structure the IT function while remaining close enough to operations to make pragmatic, technically well-informed decisions.
\nYou report directly to management and work closely with our external CISO and other technical leaders. You are accountable for:
Core Responsibilities
You are technically credible, structured and ownership-driven able to lead, prioritize and enforce standards in a fast-growing environment.
Nice-to-Have:
The minimum gross salary for this position is € 4.208,81 per month (based on full-time employment) in accordance with the collective agreement. However, there is a willingness to offer a higher salary depending on experience and qualifications.
\nQuantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees!
\nWe are engineers, scientists and builders. We respect substance over titles.
\nIf you want to build and defend something meaningful and do it properly, we would like to speak with you.
\nApply now and help shape the future of secure global communication.
\nAt Quantum Technology Laboratories GmbH (qtlabs), we are at the forefront of innovation in optical and quantum-based communication technologies. Our team develops cutting-edge quantum key distribution (QKD) systems and optoelectronic solutions for space and terrestrial applications. Based in Vienna, our center of excellence drives technological advancements that secures communication around the world.
Quantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees!
\n\nYour Responsibilities\nThe stated minimum gross salary for this position is € 35.476 per year (full-time, as defined by the collective agreement). The actual salary offered can be significantly higher and is determined based on your experience and qualifications, aligned with industry standards.
\n\n","employmentType":"FULL_TIME","hiringOrganization":{"@id":"https://quantumtechnologies.career.softgarden.de","url":"https://quantumtechnologies.career.softgarden.de","name":"Quantum Technology Laboratories GmbH","@type":"Organization","sameAs":"https://quantumtechnologies.career.softgarden.de","industry":"Consulting","logo":"https://pcw-cdn.softgarden.de/uploads/quantumtechnologies/de/widget/header/design/image_4wv3x3wlibqwl30?timestamp=1685539846336"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","postalCode":"-","addressRegion":"Wien","streetAddress":"-","addressCountry":"Österreich","addressLocality":"Wien"}}}},{"@type":"DataFeedItem","dateModified":"2026-04-30T05:14:17.000Z","item":{"@type":"JobPosting","title":"Senior FPGA Engineer – Space Systems (m/f/d)","url":"https://quantumtechnologies.career.softgarden.de/jobs/63900959/Senior-FPGA-Engineer-%E2%80%93-Space-Systems-m-f-d-/","datePosted":"2026-03-31T14:45:47.509+02:00","identifier":{"name":"Quantum Technology Laboratories GmbH","@type":"PropertyValue","value":63900959},"description":"Join Our Mission to Advance Quantum Communication in Space\nAt Quantum Technology Laboratories GmbH (qtlabs), we are at the forefront of innovation in optical and quantum-based communication technologies. Our team develops cutting-edge quantum key distribution (QKD) systems and optoelectronic solutions for space and terrestrial applications. Based in Vienna, our center of excellence drives technological advancements that secures communication around the world.
If you are passionate about space systems, and FPGA development, and quantum technology, we invite you to become a vital part of our team.
\n\nResponsibilities: \nThe gross annual salary for this position is approximately €90,000.00, with the final offer depending on your qualifications and experience. The legally required minimum salary (collective agreement) is €3,599.52 brutto per month.
Quantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees!
If you’re passionate about electronics, space, and quantum technology, we’d love to hear from you.
Apply now and help shape the future of secure global communication.
We are looking to fill a new position for an Accounting Assistant (all genders) on a part-time basis (24 hours per week).
At Quantum Technology Laboratories GmbH (qtlabs), we are driving innovation in optical and quantum-based communication technologies. Our team develops cutting-edge quantum key distribution (QKD) systems and optoelectronic solutions for space and terrestrial applications. Based in Vienna, our center of excellence contributes to shaping secure global communication through technological advancement.
\n\nThe Role\nAs a valued member of our finance team, your responsibilities will include:
qtlabs is committed to equal opportunities. Our application process is accessible. If you require assistance, please contact us.
The minimum gross salary for this position is €2.637,00 per month (full-time basis) as defined by the collective agreement. Depending on your qualifications and experience, we are open to offering a market-based overpayment.
We look forward to receiving your application!
\n\n","employmentType":"PART_TIME","hiringOrganization":{"@id":"https://quantumtechnologies.career.softgarden.de","url":"https://quantumtechnologies.career.softgarden.de","name":"Quantum Technologies Group GmbH","@type":"Organization","sameAs":"https://quantumtechnologies.career.softgarden.de","industry":"Accounting","logo":"https://pcw-cdn.softgarden.de/uploads/quantumtechnologies/de/widget/header/design/image_4wv3x3wlibqwl30?timestamp=1685539846336"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","postalCode":"-","addressRegion":"Wien","streetAddress":"-","addressCountry":"Österreich","addressLocality":"Wien"}}}},{"@type":"DataFeedItem","dateModified":"2026-04-30T05:14:17.000Z","item":{"@type":"JobPosting","title":"Senior Quantum Cryptography Expert (all genders)","url":"https://quantumtechnologies.career.softgarden.de/jobs/64402878/Senior-Quantum-Cryptography-Expert-all-genders-/","datePosted":"2026-04-28T09:47:56.533+02:00","identifier":{"name":"Quantum Technology Laboratories GmbH","@type":"PropertyValue","value":64402878},"description":"Join Our Mission to Advance Trusted Quantum Communication\nAt Quantum Technology Laboratories GmbH (qtlabs), we are developing next-generation quantum communication technologies for space applications. Our work combines quantum optics, cryptography, and advanced engineering to create practical systems for secure communication in the quantum era.
Based in Vienna, our team brings together experts in quantum key distribution (QKD), optical communication, and security-critical technologies. We are now looking for a Senior Quantum Cryptography Expert to strengthen our expertise in the theoretical foundations of QKD security and the formulation of rigorous security proofs for real-world implementations.
Quantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.
\n\nThe Role\nAs a Senior Quantum Cryptography Expert, you will take a leading role in the development, analysis, and adaptation of security proofs for practical QKD systems.
Your work will focus on understanding implementation details, identifying the relevant assumptions and threat models, and translating these into rigorous security statements using modern proof techniques. You will work across a broad range of discrete-variable QKD protocols, including both prepare-and-measure and entanglement-based schemes.
This position is ideal for a scientist who is deeply familiar with the current state of the art in QKD security proofs, can work independently across different proof approaches, and is comfortable conducting original research when new questions arise.
\n\nKey Responsibilities\nRequired Qualifications
Nice to Have
\n\nWhat We Offer\n
The gross annual salary for this position is approximately €90,000.00, with the final offer depending on your qualifications and experience. The legally required minimum salary (collective agreement) is €3,599.52 brutto per month.
Quantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees!
Apply now and help shape the future of secure global communication.
\n\n","employmentType":"FULL_TIME","hiringOrganization":{"@id":"https://quantumtechnologies.career.softgarden.de","url":"https://quantumtechnologies.career.softgarden.de","name":"Quantum Technology Laboratories GmbH","@type":"Organization","sameAs":"https://quantumtechnologies.career.softgarden.de","industry":"Aerospace","logo":"https://pcw-cdn.softgarden.de/uploads/quantumtechnologies/de/widget/header/design/image_4wv3x3wlibqwl30?timestamp=1685539846336"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","postalCode":"-","addressRegion":"Wien","streetAddress":"-","addressCountry":"Österreich","addressLocality":"Wien"}}}}]}