Christopher Zemina

Building modern infrastructure for diagnostic imaging.

📍 Vienna, Vienna, Austria🔄 Updated September 2026💼 24 investments📅 10 years investing🗓 Last invested Sep 2023𝕏 @upgrade_to_unlock
VC🌍 Austria20+ investments
24
Total investments
15
Early stage
4
Mid stage
3
Late stage
10y
Years active

Portfolio

24 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Investor
Sep 2023
ContextSDK is designed to enhance mobile app engagement and revenue by leveraging real-world user context with machine learning. ContextSDK collects more than 200 signals from the modern smartphone to assess a user’s real-world context instantly - whether theyre commuting, walking or relaxing - and use this for intent detection. This allows for the delivery of precisely timed, context-aware notifications and content that enhance user satisfaction and drive conversions. Its on-device processing ensures privacy by avoiding cloud transfers, which preserves user trust. ContextSDK’s vision is to establish real-world context data as the new gold standard in mobile app engagement, providing product owners and CMOs with a powerful tool to continuously optimize user experiences.
Investor
Jul 2023
Glaciers mission is to end waste. Sound ambitious? We agree. But the UN estimates that we only have until 2030 to change our consumption patterns before we do irreversible damage to the environment, so we’re of the opinion that now is the time for big bets. We’re starting in the world of recycling, which has a huge opportunity for impact. Americans send 1.4 million tons of waste to recycling facilities every week (that’s about 4 Empire State Buildings, or 1.5 Golden Gate Bridges). We’re also really bad at it: 25% of what we put in our recycling bins isn’t even recyclable. These recycling facilities make a living by sorting our jumbled-up waste and they need to do it cheaply and accurately. Otherwise they go out of business and our recycling goes straight to the landfill. Even so, recycling facilities today use processes that are highly manual, expensive, and error prone. We plan to revolutionize the way these facilities use technology, to make them more streamlined, accurate, and profitable - which means more recyclables avoid the landfill, and more of our natural resources are protected. Our growing team draws from the brightest and most passionate professionals across robotics, manufacturing, software, AI, and market strategy. We’re united by our deep-rooted passion to make a big environmental impact, and we’re looking for other mission-driven, creative thinkers to help us right the ship on this truly global issue.
Investor
Jan 2023
Roundtable is Europes leading infrastructure for private investments, handling all legal and administrative operations so founders, angels, and fund managers can focus on what matters.
Investor
Jun 2022
Nuvocargo offers a suite of software and services that help leading global brands simplify their North America supply chains with particular expertise on USA/Mexico cross-border freight. We help brands of all sizes gain deeper control & visibility over their cross-border supply chain while reducing their freight costs and increasing profitability. We are fortunate to work with some of the largest brands in North America and are backed by $75m from leading global investors such as Tiger Global, QED, NFX, Hi VC, Homebrew, Y Combinator, the founders of Nubank, Ramp, Deel, among others. Nuvocargo has been recognized multiple times in Y Combinator’s Top Companies List and as the #2 Most Innovative Company in Latin America by Fast Company.
Investor
Jan 2022
Ashby helps scaling companies achieve their ambitious growth targets. With Ashby, teams of all sizes can run a fast and efficient hiring process. Trusted by companies such as Opendoor, Reddit, Notion, Deel, and Modern Treasury.
Investor
Nov 2021
Float is on a mission to simplify business finance in Canada. Trusted by 7,000+ companies, we help finance teams save time, improve compliance, and scale with confidence with corporate cards, bill pay, reimbursements, FX, and more. Float Financial Solutions Inc. is a financial technology company and not a bank. The Float Visa* Prepaid Card is issued by Peoples Trust Company pursuant to a licence from Visa International. Funds associated with the Float Visa Prepaid Card, including funds held in business accounts, are held at one or more Canadian financial institutions that are members of the Canada Deposit Insurance Corporation (“CDIC”) and are eligible for CDIC deposit insurance, subject to applicable coverage limits. For more information, visit cdic.ca. The Float Mastercard® USD Card is issued by Thread Bank, Member FDIC, pursuant to a licence from Mastercard International. Banking services are provided by Thread Bank, Member FDIC. FDIC insurance is available for funds on deposit with Thread Bank, subject to applicable limits and conditions.
Investor
Aug 2021
SalaryBook is a mobile app that brings Employee Management to the fingertips of Indian SMEs. We offer an easy to use solution for Employee, Payroll and Expense Management. SalaryBook mobile app is available at : play.google.com/store/apps/details?id=com.salarybook
Investor
Jul 2021
Public is the investing platform built for those who take it seriously—with technology that makes building a multi-asset portfolio, fast, frictionless, and secure. Members can invest in stocks, options, bonds, crypto, and contribute to retirement accounts—in the same place. Alongside the robust suite of investing tools, Public offers Alpha, a proprietary AI layer, that provides fundamental data and custom analysis to support informed investment decisions. Since 2019, Public has raised over $300 million. Investors include Accel, Tiger Global, Will Smiths Dreamers VC, The Chainsmokers Mantis VC, and Shari Redstones Advancit Capital, as well as renowned figures in business and culture, like Maria Sharapova, Tony Hawk, and NYU Stern professor Scott Galloway. Member questions: support@public.com Disclosures: http://public.com/disclosures
Investor
Apr 2021
Na Vest, imaginamos um mundo livre de barreiras financeiras, capacitando clientes de todo o mundo a viver suas melhores vidas. Com origem nos vibrantes mercados dos EUA e do México e agora expandindo para o coração do Brasil, nossa jornada está enraizada em uma crença simples, mas poderosa: todos merecem acesso aos maiores mercados do mundo, começando pelas Bolsas de Valores dos EUA. Junte-se à Vest, a plataforma que ajuda você a investir em você, a construir seus objetivos e sua independência financeira. Aprenda. Economize. Invista.
Investor
Apr 2021
Small businesses are the backbone of our economy, but they shouldnt have to choose between growing their business and managing complex back office operations. Were here to change that. Mainstreet was founded on the belief that small businesses deserve the same level of support and expertise that larger enterprises take for granted. We saw an opportunity to better support small businesses across several critical services they need to succeed. From bookkeeping and tax preparation to entity formation and compliance, we recognized that small business owners were juggling too many complex tasks that pulled them away from growing their business. Our comprehensive platform brings all these essential services together in one simple, seamless solution.
Angel Investor & Syndicate Lead
Feb 2021
Investor
Jan 2021
Clara is the leading payment platform for companies in Latin America. Our end-to-end solution includes our locally-issued corporate cards, Bill Pay, crossborder payments, and our highly-rated software platform used by thousands of the most successful companies across the region. Clara is backed by top global and regional investors such as Coatue, DST Global, General Catalyst, monashees, Kaszek, Canary, A*, BoxGroup, SV Angel, GFC, Picus Capital, Avid Ventures, ICONIQ Growth, Goldman Sachs, and prominent angel investors. Driven by our six core values (Ownership, Pride, ABC, Simplicity, Clarity and Inclusivity) we’ve reached a unicorn valuation in record time, have been recognized as a Great Place to Work and as one of the most promising startups according to Linkedin’s ranking “Top Startups 2021”. We’re looking for the best talent worldwide to join our team and be part of this journey, so you cant afford to miss this chance! We are: * Shaping business finances in Latin America * Driven by our 6 core values * Proud of our inclusive and caring culture * Certified as a Great Place to Work and a Top LinkedIn Startup
Investor
Oct 2020
Creemos que todos tenemos derecho a servicios financieros simples y gratuitos, sin saldos mínimos, sin costo de apertura, etc. Nuestra misión es ayudar a construir una alternativa digital para los millones de mexicanos que no tienen acceso a un servicio financiero. Con Fondeadora® podrás acceder a beneficios como rendimientos de hasta un 9% anual entre muchos otros. Únete a Fondeadora® fondeadora.com
Investor
Jul 2020
Gigs is the leader in embedded connectivity, powering global mobile infrastructure for some of the world’s largest enterprises. By bridging the gap between telecom carriers and modern digital platforms, Gigs enables connectivity for hundreds of millions of people worldwide. Gigs is backed by Ribbit Capital, Gradient Ventures, and Y Combinator, as well as industry leaders including the CEOs of Uber, DoorDash, and OpenAI.
Investor
Apr 2020
Calm is a leading mental health company on a mission to support everyone on every step of their mental health journey. Our flagship consumer app—ranked #1 in its category with over 180 million downloads and available in seven languages across nearly 190 countries—helps people sleep better, stress less, and live more mindfully through content and tools from experts and beloved celebrity voices. Since our launch, we’ve expanded our offerings with Calm Sleep, an app providing deeper, personalized sleep support, and Calm Health, an evidence-based digital solution offered through employers, health plans, and providers to expand access, boost benefits engagement, and drive positive health outcomes. Today, Calm supports more than 3,500 organizations and reaches over 26 million covered lives through Calm Health. Recognized as a TIME100 Most Influential Company and one of Fast Company’s Brands That Matter, Calm was co-founded by Alex Tew (Million Dollar Homepage) and Michael Acton Smith (Mind Candy, Moshi Monsters, Firebox).
Show all 24 investments ↓
Experience · 30 entries
All (30)
Investments (24)
Founder (4)
2026
Co-Founder
Jan 2026
Primedea ist das Netzwerk für verlässliche teleradiologische Befundung im DACH-Raum. Radiologiezentren und Kliniken erhalten flexiblen Zugang zu einem geprüften Netzwerk qualifizierter Radiologinnen und Radiologen – ohne hohe Grundgebühren, transparent abgerechnet pro Befund. Primedea baut dabei die technische Infrastruktur der Teleradiologie: mit nahtloser Integration in bestehende RIS/PACS-Systeme ermöglichen wir ortsunabhängige Befundung, die sich reibungslos in den klinischen Alltag einfügt. Das Unternehmen wurde im Jahr 2026 vom Radiologen Dr. Florian Huber gemeinsam mit Samuel Frey und Christopher Zemina gegründet.
2025
Co-Founder
Sep 2025
Allia keeps accounting firms ahead — unifying client communication, delivering continuous dossier insights, and optimizing every workflow.
Co-Founder
Jan 2025
Mirador Tax ist die smarte Steuerlösung für deine Holding – einfach, digital, kostengünstig. Erledige Buchhaltung, Jahresabschluss, Offenlegung und Steuererklärung strukturiert in einem Portal – digital und zum Festpreis. In drei einfachen Schritten zu deinem fertigen Jahresabschluss 1) Daten hochladen 2) Automatisierte Jahresabschlüsse 3) Freigeben & einreichen Was unsere Kunden sagen: “Der Prozess war schneller und einfacher als erwartet. Mein Jahresabschluss war nach einer Woche erledigt und günstiger als beim Steuerberater.” Laura, Unternehmerin Disclaimer: Mirador Tax ist keine Steuerberatung und ersetzt keine steuerliche oder rechtliche Beratung. Die Nutzung des Portals erfolgt eigenverantwortlich durch die Geschäftsführung der jeweiligen Gesellschaft.
2023
Investor
Sep 2023
ContextSDK is designed to enhance mobile app engagement and revenue by leveraging real-world user context with machine learning. ContextSDK collects more than 200 signals from the modern smartphone to assess a user’s real-world context instantly - whether theyre commuting, walking or relaxing - and use this for intent detection. This allows for the delivery of precisely timed, context-aware notifications and content that enhance user satisfaction and drive conversions. Its on-device processing ensures privacy by avoiding cloud transfers, which preserves user trust. ContextSDK’s vision is to establish real-world context data as the new gold standard in mobile app engagement, providing product owners and CMOs with a powerful tool to continuously optimize user experiences.
Investor
Jul 2023
Glaciers mission is to end waste. Sound ambitious? We agree. But the UN estimates that we only have until 2030 to change our consumption patterns before we do irreversible damage to the environment, so we’re of the opinion that now is the time for big bets. We’re starting in the world of recycling, which has a huge opportunity for impact. Americans send 1.4 million tons of waste to recycling facilities every week (that’s about 4 Empire State Buildings, or 1.5 Golden Gate Bridges). We’re also really bad at it: 25% of what we put in our recycling bins isn’t even recyclable. These recycling facilities make a living by sorting our jumbled-up waste and they need to do it cheaply and accurately. Otherwise they go out of business and our recycling goes straight to the landfill. Even so, recycling facilities today use processes that are highly manual, expensive, and error prone. We plan to revolutionize the way these facilities use technology, to make them more streamlined, accurate, and profitable - which means more recyclables avoid the landfill, and more of our natural resources are protected. Our growing team draws from the brightest and most passionate professionals across robotics, manufacturing, software, AI, and market strategy. We’re united by our deep-rooted passion to make a big environmental impact, and we’re looking for other mission-driven, creative thinkers to help us right the ship on this truly global issue.
Show all 30 entries ↓
Investment activity
2016–2023 · 24 investments
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