Jacek Szlendak

Entrepreneur | Founder | Investor

📍 Poland🔄 Updated September 2026💼 19 investments📅 13 years investing🗓 Last invested Jun 2026
VC🌍 PolandInvested this quarter
19
Total investments
5
Early stage
3
Mid stage
7
Late stage
13y
Years active

Portfolio

16 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Investor
Jun 2026
Tenstorrent is a next-generation computing company that builds computers for AI. Headquartered in the U.S. with offices in Austin, Texas, and Silicon Valley, and global offices in Toronto, Belgrade, Seoul, Tokyo, and Bangalore, Tenstorrent brings together experts in the field of computer architecture, ASIC design, RISC-V technology, advanced systems, and neural network compilers. Tenstorrent is backed by Eclipse Ventures and Real Ventures, Archerman Capital, Samsung Catalyst Fund, and Hyundai Motor Group among others. Join us: www.tenstorrent.com/careers.
Investor
Dec 2025
Vatn Systems is a company pioneering next-generation attritable autonomous underwater vehicles (AUVs) for defense, research, and commercial maritime missions. Combining cutting-edge autonomy, modular design, and scalable swarming capabilities, Vatn delivers affordable systems built for today’s dynamic maritime environments.
Investor
Oct 2025
Redpanda is the first runtime and control plane for agent-data interaction — a unified platform that combines streaming, SQL analytics, and intelligent connectivity with the governance layer enterprise AI agents need in production. Built on infrastructure already trusted by Fortune 500 companies and fast-growing startups, Redpanda enforces governance entirely outside the agents data path, controlling what agents see, limiting what they do, and capturing a tamper-proof record of everything they touch, so organizations never have to choose between innovation and control.
Investor
Jun 2025
Privateer integrates data sources from sea to space to sculpt information into answers, enabling problem-solvers across a variety of industries to understand the present, anticipate the future, and make informed decisions in the face of complex challenges.
Investor
Feb 2025
For nearly a century, the energetics sector- factories, munitions, and propellants have been stagnant, plagued by a lack of innovation and sophistication. Despite a total addressable market of nearly $6 trillion, this industry has largely been dominated by outdated technologies and entrenched legacy players who have failed to adapt, eroding their credibility and trust currency across the global stage. The U.S. energetics enterprise is now outmatched, outclassed, and outranged by our adversaries. Our ability to project power and influence outcomes for the U.S. and our Allies is crippled. The U.S.’s position has weakened as our adversaries advance. The West is vulnerable. Our edge is gone. Enter: UNION.
Investor
Dec 2024
WasteTracker was created by real estate experts for real estate experts to provide relevant ESG data on waste production in commercial buildings. By providing waste registration sets, data and insights we support companies in measuring, managing and finally minimizing waste. WasteTracker is a WiredScore accredited solution, it provides points in GRESB and was designed according to the Directive EU 2022/2464 for ESG reporting and the European Sustainability Reporting Standards Guidelines Described by ESRS E5. We are also partners of Zero Waste Europe, which helps us provide better guideince to our clients on their Zero Waste journey.
Investor
Nov 2024
Skydio’s mission is to make the world more productive, creative, and safe with autonomous flight. AI and computer vision are foundational to our products, allowing drones to fly autonomously and automatically capture and process data. Skydio drones help public safety agencies, federal government, and private companies serve their communities more safely and effectively by providing real-time access to information captured with high-powered cameras mounted on intelligent flying robots. Our drones support thousands of organizations, including every branch of the U.S. military, 26 allied nation, 1,000+ public safety agencies across every U.S. state, and 900+ utility providers. Founded in 2014, Skydio designs, assembles, and supports its products in the U.S., with headquarters in San Mateo, CA, and manufacturing facilities in Hayward, CA. Skydio is the largest drone manufacturer in the U.S. and has shipped 55,000+ flying robots. The company is backed by top investors and strategic partners, including Andreessen Horowitz, Linse Capital, Next47, IVP, Playground, and NVIDIA.
Investor
May 2024
APS has developed and commercialised a unique system for detecting and neutralising drones: SKYctrl. The system allows for a reliable operation night and day under any weather conditions, including clouds, fog and rain with an effective drone detection distance of up to 6000 m. It is perfectly suited to protect: a. critical infrastructure installations (airports, power plants, ports, etc.) b. government buildings and installations c. military installations d. VIPs e. borders f. private property g. events SKYctrl is based on the following sensors: 1. FIELDctrl 3D MIMO Radars - operating in the unlicensed 10 GHz band, affordable while delivering superior drone detection capabilities. Advanced signal processing algorithms minimize false alarm rates and enable to differentiate drones from birds. 2. EOIR sensors - a set of cameras allows identification of drones and recording incident footage for post-incident actions night and day. On the neutralization side, SKYctrl is equipped with proprietary soft-kill: multi-band jammers. Directive antennas of the jammers are cued on target automatically by FIELDctrl 3D MIMO radars. The system comes with a friendly to use software that provides for drones monitoring, incidents archiving, sms, email and system alerts. SKYctrl is easily scalable allowing cost-efficient implementation for both large and small areas/installations.
Investor
May 2024
Wingtra is the worlds leading VTOL drone producer, headquartered in Switzerland. Since its market entry in early 2017, Wingtra has partnered with more than 80 of the biggest surveying equipment dealers across 50+ countries worldwide. Based in the heart of Zurich, Switzerland, Wingtra houses 100+ employees, out of which more than 40 focus on R&D. The majority of Wingtras engineers are graduates of one of the best science universities in the world, ETH Zurich. The same engineers design and assemble drones in-house and form Wingtras support team, which is based in Europe and the Americas. Our WingtraOne drone carries best-in-class sensors that collect survey-grade aerial data. This technologically-superior VTOL UAV is used by mapping professionals for applications that range from surveying and mining, to wildlife monitoring. WingtraOne PPK offers an all-in-one solution: broad coverage, brilliant resolution and absolute accuracy down to 1 cm (0.4 in).
Investor
Jan 2024
We believe in a future without water scarcity. We don’t have time to wait. To get there, we’ll need to make unconventional partnerships, conventional. We’ll move before regulations, catalysing public-private communities to positively impact water. With actionable AI at the core of everything we do, we will drive the change to make this happen. We are the change. Join the AI water revolution, today
Investor
Dec 2023
Purpose-built for compute, memory, and storage efficiency, Oxla is a self-hosted data warehouse optimized for large-scale, low-latency analytics with robust time-series support. Cloud data warehouses aren’t for everyone. At scale, long-term cloud compute costs outweigh short-term infrastructure savings, and regulated industries require full control over data beyond VPC and BYOC deployments. Oxla outperforms both legacy and cloud warehouses through efficiency, enabling scale for growing datasets with predictable costs, on-prem or in any cloud. Easily deploy, run, and maintain Oxla with Docker and YAML to power diverse workloads in a single, self-hosted data warehouse.
Investor
Dec 2023
Wyobraź sobie, że masz pełną kontrolę nad swoim zużyciem energii. Możesz śledzić koszty w czasie rzeczywistym i podejmować świadome decyzje, które realnie wpływają na Twój budżet. Nie musisz czekać na fakturę za prąd i bazować na niepewnych prognozach, wszystko widzisz na bieżąco w aplikacji. W Pstryk zamieniamy tę wizję w rzeczywistość. Łączymy w sobie pasję do innowacji, głębokie zrozumienie rynku energetycznego oraz nieustające dążenie do poprawy jakości życia naszych klientów. Budujemy ekosystem, gdzie technologia służy ludziom, a nie odwrotnie. W Pstryk wierzymy w transparentność na każdym kroku. Uczciwa relacja z klientem to podstawa. Dlatego stawiamy na pełną przejrzystość: - Jasne i zrozumiałe ceny bez ukrytych opłat - Szczegółowy podgląd kosztów w czasie rzeczywistym - Otwarta komunikacja o naszych praktykach biznesowych Z Pstryk zawsze wiesz, za co płacisz i ile możesz zaoszczędzić. Z Pstryk nie jesteś już biernym odbiorcą energii. Stajesz się aktywnym uczestnikiem rynku, świadomie kształtującym swoje zużycie i koszty. Wybierając Pstryk, wybierasz przyszłość, w której energia jest zrozumiała, dostępna i pod Twoją kontrolą. Razem tworzymy nową erę w polskiej energetyce – z Pstryk przyszłość jest w Twoich rękach.
Investor
Oct 2023
At THORIUM SPACE Technology we focus on next-generation LEO/MEO/GEO HTS satellite platforms and communication payloads in particular the most advanced DBF transponders in X, Ka, and E band frequency ranges. We redefine the future of satellite communications by providing next generation DBF payloads and AESA antennas . As a result of using innovative proprietary technologies and knowledge, our satellites and satellite modules will provide unparalleled performance to our customers, with increased reliability and lifetime, and decreased costs of manufacture and operation.
late stageDefense & Space
Investor
Mar 2023
At qdc, we are committed to pushing the boundaries of science to improve our world. Our product enables Data Science Teams to quickly tackle combinatorial optimization problems without any prior knowledge of scientific computing. We lower the barrier to entry for developers in operations research, logistics and supply chain.
CEO & Board Member
Jan 2023
Health Labs Care to polska firma, która swoje produkty tworzy w oparciu o najwyższe standardy jakie wyznacza współczesna nauka. Do współpracy angażujemy doświadczonych specjalistów z zakresu żywienia, naukowców i technologów z wieloletnim doświadczeniem. Budujemy nasz zespół w oparciu o różnorodne specjalizacje takie jak: dietetyka , psychologia, marketing i komunikacja, design, technologia i e-commerce. Mamy ambicję być najszybciej rozwijającą się polską firmą z sektora beauty&wellness. Wspólnie tworzymy i wprowadzamy na rynek produkty, które pomagają naszym klientom zadbać o zdrowie, urodę i dobre samopoczucie. Łączy nas dociekliwość i potrzeba dzielenia się wiedzą, która pomaga zrozumieć, że dbanie o siebie przestaje być uciążliwe, kiedy wiesz, co robisz.
Show all 16 investments ↓
Experience · 24 entries
All (24)
Investments (19)
Founder (4)
Board (1)
2026
Investor
Jun 2026
Tenstorrent is a next-generation computing company that builds computers for AI. Headquartered in the U.S. with offices in Austin, Texas, and Silicon Valley, and global offices in Toronto, Belgrade, Seoul, Tokyo, and Bangalore, Tenstorrent brings together experts in the field of computer architecture, ASIC design, RISC-V technology, advanced systems, and neural network compilers. Tenstorrent is backed by Eclipse Ventures and Real Ventures, Archerman Capital, Samsung Catalyst Fund, and Hyundai Motor Group among others. Join us: www.tenstorrent.com/careers.
Investor
May 2026
Astranis builds low-cost satellites for high orbits. Our first product, MicroGEO, offers the world’s lowest-cost satellite broadband. Operating in geostationary orbit, each MicroGEO satellite can provide dedicated satellites to small and medium-sized countries, Fortune 1000 companies, and other commercial customers. Astranis has built a $1 billion backlog for 12+ MicroGEO satellites launching over the next two years. Astranis also offers services across orbits and use cases. With contracts in place with Space Force, NASA, and other government partners, Astranis is working across MEO and GEO to support government science, PNT, and communications missions. Astranis has raised $750 million from top global investors and employs a team of over 400 engineers and builders, headquartered at Historic Pier 70 in San Francisco, California.
2025
Investor
Dec 2025
Vatn Systems is a company pioneering next-generation attritable autonomous underwater vehicles (AUVs) for defense, research, and commercial maritime missions. Combining cutting-edge autonomy, modular design, and scalable swarming capabilities, Vatn delivers affordable systems built for today’s dynamic maritime environments.
Investor
Oct 2025
Redpanda is the first runtime and control plane for agent-data interaction — a unified platform that combines streaming, SQL analytics, and intelligent connectivity with the governance layer enterprise AI agents need in production. Built on infrastructure already trusted by Fortune 500 companies and fast-growing startups, Redpanda enforces governance entirely outside the agents data path, controlling what agents see, limiting what they do, and capturing a tamper-proof record of everything they touch, so organizations never have to choose between innovation and control.
Investor
Jun 2025
Privateer integrates data sources from sea to space to sculpt information into answers, enabling problem-solvers across a variety of industries to understand the present, anticipate the future, and make informed decisions in the face of complex challenges.
Show all 24 entries ↓
Investment activity
2013–2026 · 19 investments
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