Natinael Mequanent Shebabaw

Air-quality monitoring for Addis Ababa — sensor stations, a real-time map, and a public dashboard. The day job for a year; see 3.0.0 for the role.

• added

  FastAPI ingestion over PostgreSQL, a Next.js dashboard with Leaflet and Recharts, deployed by GitHub Actions behind Caddy.

• added

  PurpleAir stations integrated alongside the in-house sensors, so the map covers more of the city than our own hardware reaches.

• added

  A public station map and time-series view, open to anyone — no account needed to read the air over the city.

• FastAPI
• PostgreSQL
• Next.js
• Docker

The Ethiopian Orthodox Tewahedo Book of Hours (ሰዓታት) for Android — Amharic-first, fully offline, built and shipped solo. 241 Kotlin files, 47k lines, and exactly one network call in the whole app.

• added

  Homophone-tolerant Amharic search as Unicode block arithmetic, not a lookup table: each Ge’ez syllable family (ሠ→ሰ, ሐ/ኀ/ኸ→ሀ, ዐ→አ, ፀ→ጸ) folds to one canonical consonant by codepoint offset, preserving the vowel order, so query and index collapse to the same form.

• added

  ባሕረ ሓሳብ implemented from the classical tables rather than shipped as a date list — Fasika via the Alexandrian paschal cycle (Julian computus, shifted to Gregorian), every movable feast a Tewsak offset from ጾመ ነነዌ, with Wenber, Abekte and Metqi exposed and pinned by unit tests against known Easter dates.

• added

  441 unit tests across 71 files — the computus, ግጻዌ link coverage, Ge’ez numerals, the backup format and Ethiopian date arithmetic, which is where a calendar app actually breaks.

• added

  Three GitHub Actions workflows. Release is gated in order — bundled-content validation, unit tests, release-blocking lint — then builds a signed APK and a Play AAB from the same commit.

• added

  The self-update notice is a Gradle flag (-PupdateNotice) wired so the failure mode is safe: forget it and GitHub loses a notice; it cannot ship an update prompt into a Play build, which would breach policy.

• added

  The corpus itself: seven canonical hours plus the Veil, the 150-psalm Psalter, the full Amharic 1980 canon, ግጻዌ across all 366 fixed dates, ስንክሳር, አጽዋማት, and ሥርዓተ ማኅሌት’s 190 feasts — each searchable and cross-linked.

• changed

  28 MB of liturgical text ships in a 10.4 MB APK — R8 with resource shrinking, manifest-driven asset loading, and a 24-script Python pipeline that is the corpus’s only writer. Nothing in assets/ is hand-edited.

• changed

  Kotlin and Jetpack Compose throughout, Material 3, Room for the journal, DataStore for preferences, kotlinx.serialization for the bundled corpus. Reaches Android 6.0 (API 23) through core library desugaring, which backports java.time across 61 files — the lower floor cost no source changes.

• changed

  That check is gated inside the repository object rather than at its call sites, so a Play build compiles it dark by construction instead of by discipline — pointing a Play install at a page of APKs is exactly what the store forbids.

• fixed

  Exactly one network call exists: a once-a-day GitHub releases check on the hand-installed build, opt-out, carrying no content and no identifiers. It fails silently — a person praying offline should not learn about it from an error.

• Kotlin
• Jetpack Compose
• Material 3
• Room
• DataStore
• Python

An open, free REST API for the Ethiopian Orthodox Tewahedo Church calendar. No auth, no keys, no database.

• added

  Date conversion between the Ethiopian and Gregorian calendars, in both directions, with batch operations.

• added

  Fasting periods with reasoning, feast lookups, and ባሕረ ሓሳብ for the movable feasts.

• added

  The ግጻዌ and ስንክሳር lectionary with Bible references, plus iCalendar feeds you can subscribe to.

• changed

  Dual implementation — TypeScript and Python.

• TypeScript
• Python
• REST
• iCalendar

Final-year project — multi-sensor hypertension monitoring, where the degree and the day job meet in one instrument.

• added

  Full five-layer chain: ESP32 sensor firmware, edge preprocessing, a scikit-learn prediction pipeline, and a React and Supabase clinical dashboard.

• added

  Real-time streaming from sensor to dashboard at 250 Hz, end to end.

• ESP32
• Python
• scikit-learn
• React
• Supabase

Backend API for a job board — listings, applications, authentication, and employer workflows.

• added

  REST endpoints over PostgreSQL with role-separated employer and applicant flows.

• Node.js
• TypeScript
• PostgreSQL
• REST

Backend work in public, from the ALX track. Unpolished on purpose — this is where the reps happened.

• added

  A GraphQL CRM backend, a multi-milestone travel application, backend security hardening, and a Redis-cached property-listings API.

• Python
• GraphQL
• Redis
• Docker