I work on software security, reliability, and open-source maintenance across Rust, Swift and macOS, TypeScript and Node.js, Python, and GitHub Actions.

My strongest work sits at the point where a vague failure becomes a precise, reviewable change: isolate the defect, identify the trust boundary, make the smallest complete fix, and prove it with tests, builds, static analysis, or a reproducible field check. I care about patches that survive contact with real maintainers, not code that merely looks plausible in a diff.

I build in public. The links below distinguish work merged upstream from work that is still under review, so the profile stays useful as a portfolio and as a record that maintainers can audit.

I have 27 authored external pull requests merged across eleven open-source projects.

• Apple Mail MCP: #97 hardened account-scoped mail operations, sender authorization, attachment limits, and file creation; the owner verified 392 unit tests, 47 integration tests, and a reproducible bundle before it shipped in v2.8.10.
• Dependency security: #119 and #123 completed the brace-expansion remediation across the legacy CommonJS and current paths. The work kept the advisory visible, preserved API compatibility, and used a 10,000-character reproduction plus an independent v5 floor to make the sequence-bound performance gap checkable.
• Apple Mail hardening: the August batch covered a repository threat model (#158), atomic batch source pairing (#159), ambiguous message IDs (#160), exclusive attachment creation (#161), bounded IMAP attachment reads (#162), disabled-by-default mail rules (#164), the Codex MCP runtime pin (#166), constrained outbound attachment reads (#168), and shared validation schemas (#169). These merged changes were included in the historical v2.10.31 release milestone; that is not the current latest release.
• Markdown Preview: #152 fixed Quick Look asset containment and #156 added native trackpad pinch zoom, both credited in v0.0.29. #185 repaired large-document selection behavior in read mode and shipped in v0.0.34.
• Downstream credit: the Apple Mail maintainer credited the original dependency finding in maintainer-authored follow-through for Apple Notes #113, Apple Numbers #49, and Apple Photos #60. Those are not PRs authored by me.

• GoalBuddy: aligned runtime receipt contracts (#28), exposed residual Codex state (#29), added deterministic reset cleanup (#30), and fixed local-board rendering for multiple active tasks (#34).
• liteparse: #313 fixed batch-output path handling for nested input directories in both the Rust CLI and Python binding.
• Snapzy: #256 removed Quick Access dismissal lag by separating immediate UI removal from deferred cleanup.
• Impeccable: #271 fixed a stale callback race that could let an older toast animate or remove a newer one.
• Make Interfaces Feel Better: #1 delivered the merged licensing and polish contribution that the earlier profile rewrite omitted.
• IINA: #6189 separates malformed URL input from a valid network URL that fails later while opening. The focused Swift fix merged into develop and closed #6134 without expanding into the separate file:// acceptance path.
• Retransmission: #256 moves blocking UPnP gateway validation off the session thread during shutdown, preserves miniupnpc ownership and diagnostic status, and handles an empty discovery result explicitly. Both core maintainers approved the final revision, and the full CodeQL and cross-platform Sanity matrix passed before merge. The verified squash commit credits me as its author and links jjoanna2-debug again in its co-author trailer.
• TokenTelemetry: #299 makes the default dashboard genuinely loopback-only, keeps explicit remote mode working, corrects the Node 20.9 minimum, updates vulnerable frontend dependencies, and clears the lint baseline. The owner independently reproduced the LAN exposure and verified both launch modes before merging; #300 landed first so lockfile-only dependency updates also reach existing installs. The merged history credits jjoanna2-debug on all three contributed commits.
• LinkedIn MCP: #854 restores fresh-install initialization by keeping FastMCP below v4 while the current tool registrations still use the removed exclude_args argument. The merged change aligns project, lock, and wheel metadata and adds a migration-trigger regression test. GitHub credits jjoanna2-debug on the verified merge commit. The fix shipped in v4.23.3, whose notes feature #854 under Bug Fixes and name @jjoanna2-debug as a new contributor. PyPI 4.23.3 carries the corrected fastmcp<4,>=3.4.4 range.

As of September 2, 2026, six authored external pull requests remain open. None is presented as merged, shipped, or maintainer-approved.

• LinkedIn MCP #863 and #865: #863 packages an opt-in, version-pinned Codex plugin with independent MCP enablement and release synchronization; initialization and tool discovery expose all 19 tools without starting Chrome or moving focus. The separate test-only #865 isolates host terminal and Python startup-hook behavior; its full local suite passes 2,970 tests with 148 declared skips and zero failures. Both PRs are open, mergeable, and fully green, with maintainer review pending.
• Transmission #8984: remains open as the original Transmission integration path after the same focused fix merged in Retransmission #256. GitHub reports #8984 as mergeable but unstable, with no approving maintainer review or current check runs. The merged and verified delivery is the Retransmission port; this entry remains only because the original upstream PR is still open.
• IINA #6190 and #6191: focused fixes for portable playlist paths and plugin default-branch updates. Both are open and mergeable against develop. Maintainers are discussing the path-compatibility boundary for #6190, while #6191 awaits plugin-maintainer review; neither is presented as accepted upstream work.
• Daytona #181: a Sapat provider guide covering endpoint control, credentials, generated-artifact cleanup, registry contracts, and bounded async polling. The PR is open and mergeable with a passing DCO check.

The personal-fork validation PRs #4, #5, and #6 merged into the fork's develop branch. #4 validated the change that later merged upstream as IINA #6189; #5 and #6 remain supporting fork history for the two open upstream reviews, not upstream acceptance or release evidence.

test-project-tbd is a compact Rust 2024 repository for learning, testing, and experimentation. It is not a production security product, scanner warranty, or security audit. The current public main is 4a1b9f0; the repository has no runtime dependencies, uses an exact Rust 1.97.1 toolchain, and protects its Repository smoke test check.

After 19 focused changes merged as PRs #8–#26, the repository doctor provides:

• bounded repository traversal and bounded text reads, with content-aware handling for text, binary files, and misleading extensions;
• provider-specific credential signatures, calibrated generic secret detection, and maintained internal precision, recall, F1, and average-precision floors;
• GitHub Actions permission, trigger, checkout, and immutable-reference policy, plus deterministic text, JSON, and native GitHub annotation output;
• checks that defend the repository's own CI and Dependabot guarantees from silent regression.

The current Basic Checks run passed. The repository is deliberately compact: the value is in the enforced contract that security controls, documentation, and automation describe the same system.

• Codex #34807 and #33994 remain open reports with evidence tied to reproducible desktop and scan-state failures.
• ProtonMail iOS Mail #109 remains an open, unresolved regression report.
• Codex #33951 is retained as historical context, but GitHub closed it as not planned on August 16, 2026; it is not counted as an open report.

• focused security review, threat modeling, and fail-closed repository or filesystem boundaries;
• Rust tooling, Swift and native macOS defects, and TypeScript, Node.js, and Python maintenance;
• concurrency, lifecycle, race-condition, dependency, and CI/CD fixes;
• technical documentation and release evidence checked against the implementation.

I keep changes narrow enough to audit, but complete enough to merge. Security boundaries fail closed. Public claims are tied to evidence. Generated artifacts are rebuilt and compared. Documentation is updated in the same change when the contract moves. A green check is useful only when it validates the revision actually under review.

I am open to sponsorship, focused security reviews, repository hardening, maintainer support, difficult bug fixes, CI modernization, and technical writing for developer tools. A good engagement has a scoped review or patch, reproducible verification, and durable handoff documentation. Sponsorship funds more upstream work with public patches rather than private one-off output.

Professional contact: LinkedIn

Last reviewed: 2026-09-02.