Raaif Yousuf

Engagements

Work built for someone other than me

These are the pieces I built for someone else to actually use: a local analytics tool for researchers, the software behind a national math competition, and a software version of the scientific calculator students sit exams with.

CLAIR

ReactTauriFastAPIDuckDBPolarsXGBoostPyTorchONNX RuntimeOllama

CLAIR is a local-first desktop app. Upload a spreadsheet, ask a question in plain English, and the answer is computed on the machine, with nothing leaving it. A React and Tauri front end sits over a FastAPI backend that does the work in DuckDB and Polars, with XGBoost, PyTorch and ONNX Runtime behind the analysis and Ollama running the language model locally.

It is in use by a Vanderbilt principal investigator and by a non-technical business owner.

Access is by request rather than open. Get in touch and I will set you up.

  • The CLAIR chat view, prompting a plain-English question about an uploaded dataset with a row of suggested starter questions.
    Asking a question about an uploaded dataset in plain English.
  • The CLAIR charts view, building a scatter plot of grade average by course from an uploaded dataset.
    Building a chart from the same dataset, without leaving the app.

Request Access

Abako

ElectronPythonFlask

Abako runs a national math competition end to end. An Excel question bank goes in; a sixty-question exam and a synced answer key come out. It grades the filled-in sheet by percentile and produces a printable report card and certificate for every student, plus one school summary.

It was built for Abako Technologies to run a real competition rather than as a demo, so the grading and report generation had to hold up for a whole cohort in one pass. It shipped as v1.0.0, packaged as one portable Windows executable.

Preparing one exam used to take me about two hours by hand: picking questions, building the answer key, laying out report cards. Abako does the same work in under a minute.

  • The Abako Generate screen, with chapter question counts summing to sixty and an exam pack just written to disk.
    Building a sixty-question exam pack from an Excel question bank, with the chapter split confirmed before generation.
  • A generated Abako report card for a student, showing final score, percentile rank and a per-topic score breakdown.
    A report card generated at the end of a grading run, built without a manual layout step.
Abako in numbers
MeasurementResultSource
Build an exam pack0.1 sAbako README, measured against the 75-question sample bank
Grade and report 100 students12.5 s, 101 PDFsAbako README, measured against the 75-question sample bank
Test suite51 testsAbako README, pytest -q
Per-exam preparation time, before and afterabout 2 hours down to under a minuteMy own before and after record of preparing one exam by hand, confirmed 20 September 2026

GitHub

Abako_emulator

TypeScriptCanvasTauriVitest

This is a software version of the Abako AB-991EX scientific calculator, the one students sit exams with, built from scratch so it runs on a laptop, a phone or a browser and behaves like the plastic one. A DOM-free TypeScript engine turns a keypress into a one-bit framebuffer on a 192x63 dot display, which a canvas layer blits to a keypad I redrew myself. Twelve modes are in, Calculate through Ratio, reachable from the same menu screen as the real unit.

The same bundle ships as a web app and as a Tauri desktop build. Every screen the engine can produce is pinned by a golden file, so a change that moves a single pixel has to update the picture it produces along with it.

  • The emulator's MENU screen, listing the calculator modes as icons with Calculate selected as mode one.
    The MENU screen, with Calculate selected as mode one.
  • The emulator's Calculate mode LCD, evaluating the square root of 24 plus the square root of 150 and showing the exact surd seven times the square root of six.
    Calculate mode reducing a sum of surds to its exact closed form.
  • The emulator's Calculate mode LCD, showing the definite integral of 1 over x from 2 to 5 in natural display with real limits and a stacked fraction, evaluating to 0.9162907319.
    Calculate mode integrating 1 over x from 2 to 5 in natural display.
  • The emulator's Calculate mode LCD, differentiating 4x squared minus 5x at x equals 0.2 and returning the exact fraction negative 17 over 5.
    Calculate mode differentiating at a point and returning an exact fraction from a decimal input.
  • The emulator's Matrix mode LCD, inverting the two by two matrix 2, 3, 2, 5 and returning MatAns 1.25, negative 0.75, negative 0.5, 0.5.
    Matrix mode inverting a two by two matrix to its decimal inverse.
  • The emulator's Statistics mode LCD, running linear regression over four points and showing y equals a plus b x with a equals 1.5, b equals 0.8 and r equals 0.8.
    Statistics mode fitting a linear regression line to four points.
  • The emulator's Vector mode LCD, crossing the vectors 1, 2, 3 and 4, 5, 6 and returning VctAns negative 3, 6, negative 3.
    Vector mode computing the cross product of two three-dimensional vectors.
  • The emulator's Complex mode LCD, converting 2 at a 45 degree angle from polar form to the rectangular result square root of two plus square root of two i.
    Complex mode converting a polar value to rectangular form.
  • The emulator's Base-N mode LCD, showing 15 times 37 computed in decimal as 555 and converted to hexadecimal as 0000022B.
    Base-N mode converting a decimal product to hexadecimal.
  • The emulator's Table mode LCD, tabulating f(x)=2x+1 and g(x)=2x-1 over x from negative one to one.
    Table mode tabulating two linear functions side by side.
Abako_emulator in numbers
MeasurementResultSource
Golden screen tests244 filesAbako_emulator README
Test suite3,560 tests, 3,558 passingAbako_emulator README