Flutter / Dart · Developer Tooling · Backend Engineering
Independent developer in Egypt. 13 engineering pull requests merged upstream across five public repositories: Flutter, Dart-Code, Flutter DevTools, Dart tooling, and Apple-maintained Pkl Neovim. Real fixes, regression tests and external maintainer reviews. One published Flutter Android app.
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Available for paid remote engineering roles and contracts. Open-source contributions do not imply employment with upstream organizations.
01 — Dart-Code DTD WebSocket reliability · Settled pending requests on disconnect and disposal; guarded sends to sockets that are not OPEN, with lifecycle regressions.
02 — Flutter Web accessibility · Corrected initial slider value/range semantics when re-enabling a disabled control. Merged into Flutter's web engine after review.
03 — Dart-Code Test Explorer and auto invocation · Removed helper-defined phantom tests while preserving CodeLens and correct test invocation. Reproduced the issue, tested before and after, reviewed with DanTup, and merged.
04 — Flutter DevTools responsive Network UI · Repaired narrow-screen toolbar and footer overflow, keeping search, filters and actions available. Approved by srawlins and merged.
05 — Dart Tools unified analytics API · Added fallbackRootTool support to environment resolution, tested precedence and contract cases, and incorporated keertip's review.
Featured by engineering impact, reviewer evidence and relevance to developer tooling — not by date or size. Contributions do not imply employment with upstream maintainers.
Verified on 12 November 2026: 13 upstream engineering PRs merged across five public repositories. Links open the actual code, discussion and merge record. Ranked subjectively by technical depth, downstream impact and regression evidence — not merge date.
| Rank | Upstream contribution | Problem solved |
|---|---|---|
| 01 | Dart-Code #6367 · DTD socket reliability | Reject abandoned requests; handle disconnect/disposal and non-OPEN socket states |
| 02 | Flutter #195564 · Web accessibility | Correct slider accessibility values and range upon re-enabling |
| 03 | Dart-Code #6422 · Test Explorer | Eliminate phantom helper tests; preserve CodeLens; correct line/name auto invocation |
| 04 | Flutter DevTools #10057 · Responsive UI | Fix Network toolbar and shared footer overflow at narrow widths |
| 05 | Dart-Code #6349 · DTD disposal lifecycle | Prevent async callbacks and subscriptions outliving VS Code extension disposal |
| 06 | Dart Tools #2806 · Analytics fallback | Handle missing/invalid DASH__TOOL using fallbackRootTool with precedence tests |
| 07 | Dart-Code #6301 · Hidden workspaces | Restore test filters and pubspec handling beneath hidden parent directories |
| 08 | Apple pkl-neovim #75 · LSP configuration | Send settings as nested tables expected by Neovim configuration lookup |
| 09 | Dart-Code #6388 · Dynamic node matching | Match test nodes by kind and full name without absorbing unrelated siblings |
| 10 | Dart-Code #6373 · Deterministic CI | Stub real tool processes and network in command tests; one local group ~24s → ~3s |
| 11 | Dart-Code #6337 · SDK search testing | Verify search precedence across Flutter, Fuchsia and PATH SDK candidates |
| 12 | Dart-Code #6332 · Package command testing | Add package-command and pubspec watcher regression coverage |
| 13 | Dart-Code #6324 · Project creation tests | Cover template selection, SDK config, cancellation, validation and error paths |
Engineering PRs only. An additional merged entry in a curated AI-apps directory is intentionally excluded. Open, approved or pending PRs are also excluded. AI assistance was disclosed to reviewers where applicable; upstream commits and reviews are independently verifiable.
| Root cause / user impact | Fix and verification | Public evidence |
|---|---|---|
| Dart-Code Test Explorer: helper-defined tests appeared as phantom root-level nodes, inflating 6/6 real tests into 6/9 displayed. | Limit static discovery to top-level main(), preserve helper CodeLens and line-mode execution; executable regressions and before/after evidence; merged 12 Nov 2026. | #6422 |
| Flutter DevTools Network: narrow screens could crowd search/filter controls and footer actions. | Responsive layout and overflow menu preserving callbacks, with widget regressions; approved by srawlins and merged 12 Nov 2026. | #10057 |
| Dart Tools analytics: shared components could not cleanly propagate their root tool when DASH__TOOL was absent or invalid. | Add fallbackRootTool to environment resolution with precedence/contract tests; approved by keertip and merged 12 Nov 2026. | #2806 |
| Dart-Code DTD WebSockets: pending RPCs hung on disconnect and sends could target closed/connecting sockets. | Settle outstanding requests, guard socket state, handle shutdown races; approved and merged 9 Nov 2026. | #6367 |
| Flutter Web slider accessibility: newly enabled slider roles could expose incorrect initial values to screen readers. | Initialize semantics values at role attachment; focused regression and upstream review; merged 4 Nov 2026. | #195564 |
| Flutter Web scroll semantics (approved; not merged): stale offsets could activate the wrong list row after a list shrank. | Corrected scroll semantics with reviewer-validated before / after demos. | #195578 · open |
| Dart pool timeouts (approved; not merged): pending resource requests could stop timing out on repeated attempts. | Restore repeatable timeout behavior and cover it in tests; awaiting maintainer merge. | #2763 · open |
My workflow: reproduce a real failure → add focused regression coverage → fix the smallest safe path → run executable tests and static checks → address maintainer review. This is also how I approach Flutter apps and backend APIs.
Explore NEMESIS / Engineering → · Full case studies
A published Flutter Android application for Quran reading, adhkar, tasbih, prayer times, and daily spiritual tools. Built and maintained with practical experience in production debugging, Firebase, mobile release engineering, and monetization.
Production evidence: Open Tasbehati on Google Play · Android production release · Source is private.
| Engineering strengths | Real-world scope |
|---|---|
| Mobile delivery | Android app release and ongoing maintenance |
| Debugging & reliability | Crash fixes, regression analysis, and UI behavior |
| Integrations | Firebase, REST APIs, and mobile ads |
| Testing | Focused regressions, release checks, and device validation |
Snapshot as of 12 November 2026. This is a short list of still-open work — separate from the thirteen verified upstream merges.
| Status | Pull request |
|---|---|
| Human-approved · open | Flutter #195578 — scrolling semantics |
| Human-approved · open | dart-lang/tools #2763 — pool timeouts |
| Under review · open | flutter/core-packages #49 — multicast_dns IPv4 interfaces |
| Under review · open | flutter/devtools #10063 — extension build-size optimization |
Browse the full open PR list · An approval or green CI is not a merge.
| Project | Evidence and scope |
|---|---|
| FamilyMove / family fitness (private client pilot) | Bilingual Flutter Android + Laravel 13 / Filament 5; family accounts, verified exercise flows, notifications, participant activity history, consent-aware AI and PDF/XLSX reports; staged client review, not a public release |
| VoiceOps Controller | Python / FastAPI infrastructure control, human confirmation for actions and regression testing |
| voxguard / PauseSignal | Flutter voice-scam risk prototype with family alerts; experimental, not a validated detector · Demo |
| Zero-Day AI Auditor | Experimental Solidity checks with local Anvil simulations; no claim of discovered zero-days |
Especially interested in: Flutter internals, accessibility, editor integrations, automated tests, Python APIs, CI reliability, and authorized security research.
Available for: paid remote Flutter / Dart development, Android engineering, developer tooling, testing, Python APIs, Laravel backends, and focused contract projects. Based in Egypt.
| Contact | Direct link |
|---|---|
| abdelrhmanmahrous386@gmail.com | |
| Phone | +20 10 6747 5499 |
| Chat on WhatsApp | |
| Telegram | Chat by phone number |
| Professional profile |
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Less noise. More code. More reproducible evidence.
NEMESIS / Engineering · Resume (PDF) · Detailed case studies · Email me · WhatsApp