AI memory company, Cincinnati, Ohio
Pieces was an always-on AI memory company, founded in Cincinnati, Ohio in May 2020 by Tsavo Knott and Mack Myers. It shipped native desktop applications for macOS, Windows and Linux, alongside a suite of plugins for the popular browsers and developer tools. It reached 114,283 registered users across 222 production releases before winding down in 2026.
Mack served as Chief Product Officer and Chief Operating Officer from incorporation through close. He led client engineering for the flagship desktop application, and owned the shared module architecture its plugins were built on.
Pieces raised $26M across eight rounds. It started with a $180,000 pre-seed SAFE that closed in December 2020 and reached a $44M post-money valuation at the Series A in April 2024, led by Drive Capital.
That money paid for two cross-platform products and the plugin suite around them: native desktop applications for macOS, Windows and Linux, and plugins for the popular browsers and developer tools. 222 production releases in under four years, drawn from 3,831 builds.
They reached 114,283 registered people, with monthly active devices peaking at 25,895.
Ninety-three people were employed over the six years, across ten countries, with twenty-five on payroll at the peak. The company ran 2,310 days from incorporation to the last day. Mack was there for all of them.
Four people were the constant across the six years: Tsavo Knott as CEO, Mark Widman as CTO, Nathan Courtney leading DevOps, CI/CD and deployment engineering, and Mack. Between them they spearheaded very nearly every release the company shipped. Most of what follows was done alongside them. Reviewing each other's work, arguing a design through to something better, pushing someone toward a different solution: that was less a separate contribution than the texture of all of them.
Lead front-end engineer on the flagship desktop application, and the thread running through every surface it touched. 3,687 commits over 43 months, directing a team of eight, and the largest single contributor by 5.7 times over the next engineer.
The work was design, build, maintain, demo, sit with the people using it, measure what they did with it, then help market and write about it. Across 2,797 pull request and issue titles it clusters where the product actually lived: the AI copilot and LLM surfaces, app UI and onboarding, search and organization, summarization. Overwhelmingly a Dart and Flutter practice.
Company-wide the record comes to 12,984 commits in 137 repositories, 1,688 pull requests at a 93% merge rate, 2,563 reviews for 41 colleagues, and 1,109 issues opened with 802 closed. 98.2% of it sits in private repositories, so a public profile shows almost none of it. The median pull request merged in 1.7 hours.
The shape says more than the totals. Reviewing exceeded authoring in six of eight active years while output kept climbing, reaching 637 pull requests in 2025 alongside 714 reviews of other people's work. In 82 of those 137 repositories the first commit landed within a week of the repository being created. Fifteen were worked for two years or more, and the top five hold 60% of all commits.
As the plugin surfaces multiplied, Mack owned the common modules and SDKs underneath them. The point was that anyone moving between the desktop app, a browser and an IDE met one coherent product rather than three. 4,077 commits across the copilot module, core connector, workstream activity, saved materials, settings and the platform client SDK, from 2023 into 2025.
Mack owned the support pipeline with CTO Mark Widman across 3,127 tickets, both of them while holding engineering roles. The loop from a frustrated user to a shipped fix usually ran through one of two people. The accounts ranged from a publicly traded company through venture-backed startups to individuals of every description, anyone who worked on a computer. That is a wide span of expectations to hold at once: security review and fleet rollout at one end, one person's workflow at the other.
Held working relationships with Google, Microsoft, OpenAI, Anthropic, Groq, OpenRouter and Sentry, and kept them running day to day. Negotiated the company's largest infrastructure agreement with Google Cloud: a multi-year commitment running to $2.8M in its first year, with a credit allocation large enough to change what the company could afford to build. Handled commercial terms across the rest of the stack as infrastructure and model spend grew.
Supported Tsavo Knott across every round: decks, narrative, and the numbers behind them. Then the legal work with counsel for the Seed, the Series A and the bridges between, through SAFEs and convertible notes. Equity and cap-table administration appears in 4.9% of all recorded sessions, payroll and benefits in 8.2%. That is what carrying it directly rather than overseeing it looks like.
Worked with Knott on company vision and strategy. Worked with designers on brand, identity and the emotional register of the product, with writers on documentation, and with the team on events, conferences and collateral. Content, documentation and SEO show up in 29.2% of sessions, the website and landing pages in 11.0%, specifications and design in 11.8%. Where the company had a gap, this is usually where it got filled.
He also carried the company in public. He opened StartupCincy week in 2022 with a note to a full room, sat on a panel at MidwestCon in 2025, and showed the company at Civo Navigate in Austin. Pieces appeared on a slide in Satya Nadella's Microsoft Build keynote in 2023, one logo in a grid of them.
Compliance and legal work appears in 14.2% of recorded sessions, tax and credits in 5.9%. Obligations at state and federal level, handled directly, plus taking the company through SOC 2 Type II so it could sell to buyers who required it.
Team dinners, conferences, speaking engagements and panels.