Latest Interviews

Security and Privacy for Crypto with Zero-Knowledge Proofs

Zooko Wilcox, Peter van de Ven, Jesse

Spanning from the WWII codebreaking efforts of Alan Turing to the modern necessity of HTTPS, this presentation traces the evolution of cryptography from a military secret to a global economic standard. It details the historical contradiction between blockchain transparency and privacy until the practical application of zero-knowledge proofs enabled the creation of Zcash, the first cryptocurrency to encrypt transaction details. Looking forward, the technology aims to resolve scalability bottlenecks and revolutionize digital identity verification by allowing users to prove eligibility without disclosing sensitive personal data.

Ilya Volodarsky - Analytics for Startups

Ilya Volodarsky

This presentation establishes a universal business funnel framework centered on Acquisition, Engagement, and Monetization metrics, defining Product-Market Fit through a four-week retention plateau between 20% and 30%. Founders are advised to implement a specific tool stack, including Google Analytics for traffic and Amplitude or Mixpanel for user cohorts, while avoiding the trap of optimizing software selection before validating core product value. Successful execution requires maintaining a central data dashboard for daily accountability, utilizing session replay tools like FullStory to fix friction points, and ensuring retention metrics align with the natural usage cycles of the specific business model.

Work at a Startup Expo 2019

Ryan Choi, Geoff Ralston, Vijay, Tanay, Anjana Rajan, Jonathan, Greg, Julia, Daniele, Mike, David, Ning, Paul, Samir Maghani, Tarek, Lior, Chris Nguyen, Erica, Wei, Lyle Avery, Gregory Coburger, Adam McKenzie, Jacob, Parker Conrad, Ilya, Lester, Josh, Jordan, Marc Friedman, Hugh, Ethan, Hanan, Reese

Y Combinator hosted a high-stakes hiring expo featuring 40 funded startups, where founders pitched their missions and technical stacks to engineers in a rapid-fire, two-hour format. The event highlighted diverse sectors ranging from healthcare AI and fintech to autonomous logistics, utilizing a digital directory to match attendees with companies like Checkr, Glide, and Scale. By emphasizing rapid career growth and high-impact environments over corporate stability, the gathering successfully connected over 2,000 alumni founders with talent to advance products that currently serve millions of users.

Secrets of the deep ocean

Karl

Scientists aboard the Australian Government's RV *Investigator* are surveying unexplored Tasmanian seamounts to assess deep-sea ecosystems at depths exceeding 1,000 meters. While Marine Protected Areas established in the 1990s show positive signs of recovery with returning urchin populations and anemones, the data reveals that the foundational stony coral matrix damaged by bottom trawling has not reformable over the past two decades. These findings will guide future conservation policies and promote sustainable fishing practices by highlighting the long-term resilience limits of these unique habitats.

The a16z Pitch Room: Sandbox VR

Steve Zhao, Siqi Chen, Andrew Chen, Frank Chen

Andreessen Horowitz led an investment in Sandbox VR to fund its scalable network of untethered, wireless virtual reality locations that address high churn rates in the traditional consumer VR market. General Partner Andrew Chen backed the strategy of positioning the company as a future content publisher and platform for third-party developers, rather than a simple hardware retailer, citing strong unit economics and near-unanimous customer satisfaction data from existing Asian markets. With a founding team combining AAA game development experience and hyperlocal growth expertise, the venture aims to expand from 14 to over 50 rooms while mitigating novelty risks through rapid content rotation and exclusive IP partnerships.

a16z Podcast | Finally a Tablet that Replaces Your Laptop

Benedict Evans, Steven Sinofsky, Michael Copeland, Stephen Sanofsky

Stephen Sanofsky and Benedict Evans report that the new iPad Pro has successfully replaced traditional laptops for most professional workflows by eliminating the mental load of file management and offering superior mobility through features like built-in LTE and all-day battery life. While Evans identifies minor gaps in specific desktop applications, he argues that the device's massive computational power and seamless ecosystem integration signal an irreversible industry shift where general office tasks migrate from Windows and Mac to mobile-first platforms. Sanofsky notes that this transition requires a fundamental change in user behavior, similar to the DOS-to-Windows evolution, as billions of non-industrial workers increasingly rely on optimized mobile interfaces rather than traditional desktops.

General Stanley McChrystal (US Army, Ret.) - "Leaders: Myth and Reality"

Stanley McChrystal, George Washington, Walt Disney, General Stanley McChrystal, David

General Stanley McChrystal challenges the mythological view of infallible leaders in his book *Leaders: Myth and Reality*, profiling historical figures like Robert E. Lee, Walt Disney, and Coco Chanel to demonstrate that human flaws are intrinsic to effective governance. McChrystal further argues that significant societal reforms often rely on resilient systems rather than singular heroic agency, as evidenced by his analysis of Martin Luther King Jr.'s organizational legacy. Looking toward the future, he advocates for a shift from military victory to geopolitical management in Afghanistan, demands a layered defense against AI-driven disinformation, and proposes a paid national service program to revitalize active American citizenship.

Partnerships in Global Health

Thomas Bollyky, Deborah Birx, Kathy Calvin, Bruce Gellin, Susan Sweeney

The provided text fails to describe a coherent event, as the source material is a corrupted and semantically incoherent machine generation containing contradictory health statistics and nonsensical procedural claims. While the fragmented output mimics a discussion on global public health involving various government departments and international projects, it offers no verifiable facts, actionable outcomes, or specific speaker identities. Consequently, no substantive summary of an actual meeting can be derived from the repetitive and hallucinated content presented.

Design for Startups by Garry Tan (Part 1)

Garry Tan

Week 4 of Y Combinator Startup School provides a comprehensive framework for founders to master product design by prioritizing user problem-solving over artistic expression. The session details a sequential workflow where Product Design establishes requirements through specific personas, Interaction Design applies established patterns to reduce cognitive load, and Visual Design enforces clarity through contrast and whitespace. By emphasizing that good design requires empathetic user research and immediate, imperfect launches, the curriculum advises entrepreneurs to iterate rapidly based on direct customer feedback rather than relying on perfection.

Work at a Startup Expo 2018

Sam Altman, Justin Kan

Justin Kahn and Sam Altman provided contrasting yet complementary frameworks for evaluating startup careers, with Kahn highlighting the risks of financial instability alongside the unique benefits of rapid skill acquisition, while Altman outlined specific investment criteria such as product love and founder quality to identify high-potential ventures. A diverse cohort of companies from the hardware, AI, and Sectors presented concrete opportunities, ranging from late-stage giants like Instacart seeking 200 new engineers to seed-stage firms like Astranis raising capital for telecommunications satellites. Collectively, these presentations emphasized that while talent acquisition remains a critical bottleneck across the market, early employees face a trade-off between the accelerated learning curves of startups and the necessity of negotiating equitable equity stakes.

Announcing Work at a Startup

Jared Friedman, Matt Long, Craig Cannon

Scheduled for July, the Work at a Startup conference reunites Y Combinator partners Justin Kahn and Sam Altman with over 80% of the accelerator's hiring companies for a scaled event featuring 35 pitches across software, robotics, and deep tech. Attendees will engage directly with startups ranging from unicorns like Instacart to early-stage hardware firms offering roles in AI, DevOps, and co-founder positions, while also viewing live hardware demonstrations from entities such as Starsky Robotics. The gathering addresses critical market trends including remote work expansion, equity transparency, and the shifting definition of startup engineering to counter traditional compensation gaps.

Effective Programming: Adding an Effect System to OCaml

This presentation details a comprehensive framework for algebraic effects that separates effect specification from implementation by treating operations like concurrency and state as explicit, resumable interruptions. It contrasts this approach with traditional monads to eliminate boilerplate and demonstrates a full conversion of the OCaml standard library, introducing syntax for tracking purity, region-based locality, and effect polymorphism directly in the type system. The work culminates in a runtime model where effect handlers manage heap-allocated call stacks while future extensions aim to enforce region safety and support multi-handler compositions for complex scenarios.

Welcome to the startup jungle

Janos Amstutz, Sandro, Isabel, Vinicius Guzmão, Chris Haley, Corrie Vu

Entrepreneurs in the UK and Brazil navigate a high-risk environment where intense competition and a scarcity of venture capital force rapid pivots, as exemplified by HoloMe founder Janos Amstutz securing commercial traction through strategic partnerships after failing to secure immediate investment. Simultaneously, the Medroom team in Brazil overcame a last-minute technical crisis to successfully demonstrate their VR medical training tool to major university partners, proving the viability of their solution for reducing patient errors. These divergent case studies highlight how founders must combine technical iteration, market validation, and sheer determination to survive the transition from self-funded prototypes to commercially sustainable businesses.

Derek Belch

Derek Belch

Founded by former Stanford coach Derek Belch, Stryver Labs applies spherical-camera virtual reality to athlete training by recording real game footage rather than using rendered graphics. The company achieved immediate traction after a quarterback's career-best performance followed a 15-minute VR review, leading to rapid adoption by seven college football teams, six NFL franchises, and pilot programs in the NBA and NHL. Stryver continues to expand its problem-first approach while monitoring lightfield technology to overcome current hardware limitations that hinder high-speed sports training.

Mark Ring

Mark Ring

Mark Ring, co-founder of Kojitai, presents an "iso-laminar learning mechanism" that aims to transition AI from performing superficial tasks to achieving genuine world understanding through continual learning. This approach, utilizing a forecasting system developed alongside Rich Sutton, enables robotic agents to autonomously construct complex geometric abstractions like room layouts and obstacle distances from raw sensory inputs without human labeling. While technical hurdles regarding computational scale remain, Ring anticipates that solving these challenges within the next few years will revolutionize industries ranging from autonomous vehicles to intelligent search systems.