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Cofounder, CSO @perplexity_ai. Former high frequency trader, competitive programmer. Think fast, build faster.

267 following197k followers

The Innovator

Cofounder and CSO at Perplexity who moves at light speed, ex-high-frequency trader and competitive programmer who turns ambitious ideas into shipping products. Focused on infrastructure, agentic systems, and devex to make AI reliably useful. Thinks fast, builds faster.

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Johnny moves so fast he asks an AI for permission before he finishes typing his own thought, blink during his standup and you'll miss three launches and a pull request that already auto-merged.

Revived his very first Perplexity project, an AI stock screener, and shipped it to production, improving from ~50% LLM reliability two years ago to ~99% today; plus led major infra improvements powering Deep Research and Computer.

To remove friction between people and complex information by building fast, reliable AI infrastructure and agentic tooling that lets computers take on the hardest tasks so humans can focus on higher-leverage work.

Values speed, pragmatic experimentation, and measurable reliability. Believes in shipping early and iterating, automating context switching, empowering developer experience, and letting data guide decisions over dogma.

Rapid product- and infra-level execution, deep technical chops from HFT and competitive programming, strong focus on reliability and instrumentation, and the ability to rally engineering teams to ship complex features fast.

Can prioritize speed over polish or community storytelling, occasionally terse in public engagement, and may under-index on audience-facing content (low tweet volume relative to impact) which slows personal brand growth.

Grow on X by translating infra wins into accessible narratives: post short explainer threads (before/after metrics, root causes, fixes), share lightweight demos/screenshots or short videos, run occasional AMAs/Spaces about agentic tooling, spotlight team stories and post-mortems, engage frequently with replies, and pin a signature thread called something like “Build with Johnny” that bundles lessons, code snippets, and product milestones.

Fun fact: Johnny's very first project at Perplexity was an AI stock screener when LLMs were ~50% reliable, today it's back in product at ~99% reliability. Also, there's an unofficial office protocol he mentions: ask the AI before asking another person to reduce context switching.

Top tweets of Johnny Ho

Perplexity's latest updates for this week: perplexity.ai/changelog/pers… Quality of life improvement: being able to visualize and stop any individual subagent that's running.

7k

Back in the game: it's never been so easy to ship @perplexity_ai Shoutout to our devex and infra teams for making agentic coding easier by the day.

7k

Announcing our new resident program at Perplexity: perplexity.ai/hub/residencyp…. No matter where you are currently in your career or which industry you've worked in, Perplexity offers a unique experience to learn and ship product. First class scheduled for Feb 2025 and second class scheduled for June 2025.

12k

Excited to announce Projects, which are Perplexity's hubs for agent and human collaboration. Most of my time now lives in Projects, where agents automatically manage their own persistent files and collaborate with native tools. Projects are Perplexity's core for collaboration: as agents become more long-running, they will need more agent-native ways to persist and self-improve: memories, skills, and files. But until today, agents have lacked a central hub for collaboration that allows for a persistent area for knowledge work. That place is Projects, not individual chats or files. Projects come packaged with an set of CLI tools intentionally designed for agents to collaborate across files, projects, and with other agents. Importantly, both individual and project identities are fully functional. Individually-scoped connectors are supported as usual, but so are project-level credentials. A project-level brain agent manages the project and provides objective summaries and memories. Agents do the execution but humans still do the steering with notifications and permissions checks. Internally at Perplexity, the canonical way to work is now to start in Slack (each Project connects with at least one Slack channel), spawn multiple threads of conversation in parallel, accept most first passes, and follow up in Perplexity's apps when refinement is needed. The future of knowledge work is looking bright: work is incredibly efficient with tools like Computer, leaving more time for curiosity and learning. Projects is the next step in the vision that Spaces began for collaboration and persistent storage of context. We're excited to see how you use Projects and we will learn from your feedback to keep pushing the frontier of what is possible when agents and humans work together to build real businesses.

18k

Most engaged tweets of Johnny Ho

Excited to announce Projects, which are Perplexity's hubs for agent and human collaboration. Most of my time now lives in Projects, where agents automatically manage their own persistent files and collaborate with native tools. Projects are Perplexity's core for collaboration: as agents become more long-running, they will need more agent-native ways to persist and self-improve: memories, skills, and files. But until today, agents have lacked a central hub for collaboration that allows for a persistent area for knowledge work. That place is Projects, not individual chats or files. Projects come packaged with an set of CLI tools intentionally designed for agents to collaborate across files, projects, and with other agents. Importantly, both individual and project identities are fully functional. Individually-scoped connectors are supported as usual, but so are project-level credentials. A project-level brain agent manages the project and provides objective summaries and memories. Agents do the execution but humans still do the steering with notifications and permissions checks. Internally at Perplexity, the canonical way to work is now to start in Slack (each Project connects with at least one Slack channel), spawn multiple threads of conversation in parallel, accept most first passes, and follow up in Perplexity's apps when refinement is needed. The future of knowledge work is looking bright: work is incredibly efficient with tools like Computer, leaving more time for curiosity and learning. Projects is the next step in the vision that Spaces began for collaboration and persistent storage of context. We're excited to see how you use Projects and we will learn from your feedback to keep pushing the frontier of what is possible when agents and humans work together to build real businesses.

18k

Announcing our new resident program at Perplexity: perplexity.ai/hub/residencyp…. No matter where you are currently in your career or which industry you've worked in, Perplexity offers a unique experience to learn and ship product. First class scheduled for Feb 2025 and second class scheduled for June 2025.

12k

Back in the game: it's never been so easy to ship @perplexity_ai Shoutout to our devex and infra teams for making agentic coding easier by the day.

7k

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