Fatih Küçükkarakurt

I write numerical and systems software — the kind where the answer has to be correct, not merely plausible.

I'm the sole author of KATAI 2D, a geotechnical finite element platform: plane-strain and axisymmetric analysis, staged construction, consolidation and Newmark dynamics, with 119 automated regression tests that reproduce published and closed-form results within stated tolerance bands. It's archived with a DOI.

I also wrote Nerve, an LLM inference and on-device learning library in pure C — single header, zero dependencies, running TinyLlama-1.1B on a 2017 laptop CPU and compiling to a 65 KB WebAssembly module. Before that, a compiler and a 32-bit operating system, both from scratch.

WHAT I DO

- Numerical and scientific computing: FEM, sparse linear algebra, nonlinear solvers, constitutive models, performance-critical C and C++

- Engineering automation: turning spreadsheet calculations into tested, versioned tools; CSV/Excel/JSON pipelines; reporting

- Debugging hard failures — particularly the class where code reports success and the answer is wrong. In KATAI I verify every linear solve against the system it claims to solve, because a sparse direct solver confronted with a rank-deficient tangent will perturb its pivots, report success, and return a vector that satisfies nothing.

- Refactoring legacy numerical code without changing what it computes Languages: C, C++ (modern and ANSI), Python, Rust. Reading proficiency in Go and TypeScript.

HOW I WORK

I ask about your problem before I quote. Fixed scope, milestone-based delivery, source code and a short handover document included. If I don't think a job is worth doing, I'll say so.

Send me the details and I'll tell you honestly whether I'm the right person for it.