I build high-performance software from first principles, spanning compilers, embedded graphics, networking infrastructure, and simulations. I enjoy understanding the layers beneath modern abstractions and designing systems that are efficient, reliable, and maintainable.

• Implements a complete compilation pipeline including a Haskell frontend (lexing, parsing, semantic analysis), CFG-based three-address-code IR, C backend/code generation, and OCaml linker.
• Features separate compilation with custom object files, symbol resolution, relocation handling, and ROM image generation for bare-metal execution.
• Designed around a custom ABI, memory model, and calling convention with explicit zero-page allocation and software stack management for constrained 8-bit hardware.

• Implemented entirely with raw POSIX threads (pthreads) and native sockets, utilizing a custom-built manual thread-pool architecture.
• Uses OpenSSL’s C API directly to handle TLS handshakes and encrypted I/O.

• Implements a fully programmable graphics pipeline from scratch, featuring software-defined vertex and fragment shader emulation.
• Handles raw matrix math, coordinate space transformations, clipping, and rasterization entirely on the CPU without native GPU acceleration.

• Each state is a struct of optional enter/tick/draw/exit callbacks, with a shared, swappable context passed to all of them.
• Used across several of my projects, including the shader-works demos, for scene and game-state management.

• Languages: C, C++, Rust, Haskell, Ocaml, JavaScript, Python, ARM Assembly, 6502 Assembly
• Low-Level Dev: Systems Programming, Memory Management, Compiler Design, Embedded Rendering Pipelines
• Networking: POSIX Sockets, Concurrency (pthreads), TLS/SSL Cryptography

Contact: jackwtdev@gmail.com