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bilalkah/README.md

Bilal Kahraman

C++ Systems Engineer — Database Internals · Database Kernel Developer @ Huawei

I work on PostgreSQL internals and database engine development, and contribute upstream to Babelfish for PostgreSQL — T-SQL compatibility, type systems, and engine-level bug fixes.

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🐘 Open-Source Contributions

Babelfish for PostgreSQL — T-SQL compatibility for PostgreSQL

Merged contributions in both layers of the project:

Highlights:

  • Implemented bidirectional char/nchar ↔ binary/varbinary casting with encoding-aware conversions, including TRY_CAST/CONVERT/TRY_CONVERT support
  • Fixed T-SQL decimal→integer conversion semantics (truncation vs. rounding) — a correctness issue affecting financial computations in migrated workloads
  • Engine-side function behavior fixes in the modified PostgreSQL core

Featured Projects

  • Kergit — Real-Time Communication Platform Open-source voice and messaging platform: custom C++ WebSocket server, Protocol Buffers protocol, PostgreSQL persistence, Redis session state, LiveKit media, self-hosted deployment.
  • Wolfenstein-Style Game Engine Raycasting engine from scratch in C++/SDL — DDA rendering, A* pathfinding, state-machine enemy behavior.
  • Path Planning Library C++ implementations of A*, RRT, RRT* and friends, with simulation and visualization.

Tech

Languages: C++11/17, C, Python, SQL, Bash Focus: PostgreSQL internals · database kernel development · performance engineering · networking Infra: Linux, Docker, WebSockets, Protocol Buffers, Redis Background: robotics & autonomous systems, automotive simulation

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  1. kergit-server kergit-server Public

    Kergit is an open-source communication app focused on real-time text and voice channels. It includes a C++ backend, a web client, WebSocket-based messaging, LiveKit-powered voice rooms, session man…

    C++ 19

  2. kergit-web-client kergit-web-client Public

    Frontend for Kergit, built with Nuxt and Vue. Provides real-time chat, voice channels, presence, authentication flows, and LiveKit-powered media features.

    TypeScript 3

  3. babelfish_extensions babelfish_extensions Public

    Forked from babelfish-for-postgresql/babelfish_extensions

    Babelfish for PostgreSQL provides the capability for PostgreSQL to work with applications written for Microsoft SQL Server. Babelfish understands the SQL Server wire-protocol and T-SQL, the Microso…

    TSQL 2

  4. wolfenstein wolfenstein Public

    The Game of Wolfenstein-3D shall sound in the deep, one last time!

    C++ 6 1

  5. path-planning path-planning Public

    2D Path planning algorithms project is consist of A*, Breadth-First Search, Depth-First Search, RRT (Rapidly exploring random tree) and RRT* algorithms visualized with sdl3.

    C++ 6 1

  6. Private-Branch-Exchange Private-Branch-Exchange Public

    A simple implementation of a server that simulates a PBX telephone system in C

    C