Zachary Roth
Founder & Product Engineer @ Raintree
I build technical products for AI agents, developer infrastructure, and data-intensive operations: policy evals, context pipelines, knowledge graphs, and SaaS surfaces where permissions, approvals, and audit trails matter.
Selected systems
A few representative builds. The full portfolio groups the rest by agent safety, developer tooling, data systems, SaaS, low-level systems, and creative software.
- Agent safetyPolicyStrataDeterministic regression tests for cross-layer policy drift in LLM data-agent stacks.Paper, artifact, scanner, PyPI package, minimized witnesses.
- Context infrastructuredocpullBrowser-free web-to-Markdown crawler and MCP server for source-linked agent context.Markdown, JSONL, SQLite FTS5, OKF bundles, SSRF guards.
- Product SaaSBetterOffHousehold finance workspace for connected accounts, cited analysis, billing, and approvals.Scoped data, read-only connectors, audit logs, approval-gated actions.
- Data systemsInvestment Research GraphPrivate local research graph with MCP tools, embeddings, signals, proposals, and owner curation.SQLite graph, sqlite-vec, DuckDB/Parquet, FastAPI sidecar.
- Developer dataBuilderGraphOpen-source ecosystem graph with contributor enrichment, search, APIs, and MCP tools.Cloudflare Workers, D1, GitHub enrichment, signed webhooks.
- Low-level systemsSimpleOSUnix-like x86 kernel with userspace, paging, syscalls, pipes, terminals, and browser boot.Ring 3 userspace, copy-on-write paging, v86 demo, QEMU ISO.
Who am I?
At Raintree Technology, I design and ship full-stack products primarily using TypeScript, Python, Rust, and Postgres.
Previously, I worked across developer relations, ecosystem growth, and product teams at Aptos Labs. Earlier, I managed product work for Solflare during its growth to 500K users and authored investment and technical materials supporting more than $2B in private-market fundraising initiatives.
Recent updates
- PolicyStrata
Published the paper and artifact release for deterministic policy-drift regression tests in LLM data-agent stacks.
- docpull
Shipped the 5.0.x release line for local-first web capture, context packs, and report sharing.
- BuilderGraph
Latest GitHub update launched Talent Maps MVP on top of the open-source ecosystem graph.
- cfg-eval
Latest GitHub update hardened constrained SQL evals against phantom-column false positives.
- HIG Doctor
Latest GitHub release added CLI/TUI validation, CI hardening, accessibility fixes, and website updates.