Saifullah AhadHow I built it
Forty-six build stories, from problem to proof
The plan I wrote, what the testing caught, and how each app reached Google Play. Every fact comes from the app's own build record.
What two nonprofit sources say about printing from an Android phone to a USB printer, then which printer languages Natisniti sends, which it does not, and that no printer has been tested yet.
How to organize research papers, from two university library guides: four bins, a reading order, file names and notes, plus what LitWeave keeps and exactly what it sends to Crossref and Unpaywall.
What FHWA and Iowa State say to write on a concrete slump test form, then how Qivra keeps one slump test as a range with a refusal option, and where it stops.
How much do delivery drivers make? What a US government source counts and leaves out, one Berkeley study on which costs count, then what Gounid shows a rider and where it stops.
How to measure room temperature without a thermometer: what WHO and the US Weather Service say, then what Sigrile reads from a phone’s battery heat and where it stops.
The five cron fields and the day rule from a standards text and a university page, then what TickSpec previews and where it stops.
What two university cash offices say about counting a short drawer, then what Dopokaz lists from the records you enter, and where it stops.
How to plan a fabric cutting layout from two university extension guides, then what Piegrieztne arranges from measured outlines and where it stops.
How to make a bootable USB from an Android phone: what you need, that it erases the stick, two named sources, then what Engegar checked and what it did not.
How to keep a pantry inventory from two university extension pages, then what UseSoon tracks: dates, a use-first queue and meal ideas, and where it stops.
How to label breaker panel circuits, from three named safety sources, then what CircuitDocket keeps as a written record of a panel and where it stops.
What two state sources say a repair job record needs, part by part, then what Islah puts on its job card and receipt text and what it leaves out.
A move out inspection checklist for tenant use from a Maryland county agency and a charity in England, then how the app keeps a room by room record, and where it stops.
How to see who is connected to my wifi, from two US government pages, then what Sentry lists when it scans from a phone and where it stops.
How to check if a photo is photoshopped, from two named sources, then what LumaClue shows about one photo: file details and five readings, and where it stops.
What the 20-20-20 rule says and other screen habits from two health sources, then how AynPause reminds you to take the break and where it stops.
What should you check at a hive inspection, and how often? Six checks from Utah State University Extension and a Minnesota bee lab, plus what HiveNote records and where it stops.
Where does your wifi give up? Five steps from a university IT article and an FCC guide for finding weak rooms, plus what LinkContour does and where it stops.
How long will a battery run what you need in a power cut? Five steps from a university extension and a national lab, plus what Energy Loom does and where it stops.
Employer not paying salary? Guidance from worker advice sources, plus a look at PayProof for organizing your own work and pay entries.
How is an estate divided in Islam? The order and fixed shares from two named sources, plus what Oinordetza does and where it stops.
Kids reading practice at home, with sourced ideas for sharing books and a look at Lohkat, where the child reads first and the parent follows.
How to dry rice after harvesting, with sourced sun drying steps, a paddy humidity table and a look at Tnixxif's weather planning and physical readings.
Turn camera photos, PDFs, and pasted text into reflowable text with personalized typography, a focus ribbon, and synchronized speech. Includes a guide to dyslexia reading strategies.
Turn a spare Android phone into an awareness aid that listens for your doorbell chime and relays an encrypted cue to your phone. Includes a guide to deaf alerting options.
Track cold-surface condensation risk, map room dew-point margins, and compare indoor vs. outdoor moisture. Includes a guide to damp causes.
Recover values from a chart image or PDF, check the traced points against the source, and export a table. Includes a guide to axis calibration.
Photograph an overseas job contract, see each clause in a margin, and find where the English and Arabic versions use different numbers.
A Bangla phonetic keyboard put side by side with Ridmik: what each one does, where they differ, and a table you can check against each app’s own listing.
Tap any word or sentence in the Quran reader to hear instant pronunciation guidance in Sheikh Khalil Al-Husary’s voice.
Pair two phones to measure field perimeters with raw GNSS single differences, verify live horizontal uncertainty, and check traverse closure.
Repair fixed delays or gradual frame rate drift across SRT and WebVTT files, test against local video playback, and export clean timestamps.
Malay in Rumi becomes Jawi through a word list and letter rules. See where automatic spelling needs a second look, and how to check it with DBP references.
A dairy family’s milk slips, checked against the dairy’s own cited rate rule: every step of the arithmetic shown, the month matched line by line, and no gap in a rate chart filled by a guess.
A braille translator you can check: every cell explained, a clearly limited part of Unified English Braille, and no photo reading accepted until a person reviews it.
One meter, several households. A shared bill needs an explanation, including the part nobody can confidently assign. Testing two similar fridges made that boundary concrete.
Is the electricity meter running fast? The phone camera times the meter’s light and gives watts with a range. Google Play said no twice first: every source link was dead.
A tape and a formula can estimate cattle weight, but not every animal stands still. Two phones give a range, and the app refuses to answer when the pictures are too weak.
A sample student got the wrong starting point. Testing the old logic on 26 pretend students found the cause, and the new logic found all 26.
People who stutter practice alone for months. It shows, as they speak, whether the techniques are working — and never shows a number it didn't measure.
The first check said "ready" — the sound engine had never run. Making it run found three bugs, then a controlled tone test proved the fix.
The phone being sold tests itself and hands the buyer a signed result — proven on a real phone, with zero crashes.
Friends and family cancel debts that go in a circle — only when everyone in the loop agrees. Proven with a real two-person test.
Tells you exactly where and when to look for the new crescent, from real astronomy — and says when a sighting was impossible.
Orders a village's one harvester by which field is losing grain fastest — and every phone can check the order is fair.
Shows where a link really goes before you open it. Testing caught two real bugs, fixed with tests that failed first.
Open to work
Let's build your AI product system.
Full-time roles — remote anywhere, hybrid in Bangladesh, or on-site abroad: AI Product Builder, AI Product Manager, AI Workflow Orchestrator, Product Delivery Lead.
Based in Dhaka, Bangladesh (UTC+6) · works any time zone · can start now · ready to relocate with visa sponsorship.