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OutBlade/README.md
Sebastian Kallfelz. Animated cutaway of a High-NA EUV lithography scanner: a CO2 laser turns tin droplets into plasma, and its 13.5 nm light runs through mirrors from reticle to wafer.

LinkedIn Email SemiYield live demo

Microelectronics student at the Karlsruhe Institute of Technology, building open-source tools
that put process physics, lithography and yield analytics into engineers' hands.

01 · Datasheet

Profile as an IC datasheet: KIT ETIT B.Sc. student, research assistant at IMT (Korvink group) working on superconducting Lenz-lens resonators for NMR; process modeling, lithography, SKY130 analog design and ML yield work

02 · Process flow

From RTL to readout: every step of the flow has a tool I built for it.

Process flow: design, layout, litho, process, yield, test, with one repository per step
Step Repository What it does
01 DESIGN librelane-ppa Timing closure and PPA exploration for LibreLane/OpenROAD: slack-driven Fmax search, config sweeps, critical-path attribution back to RTL modules.
02 LAYOUT gds-inspector GDS/GDSII layout viewer for browser, VS Code and Cursor: 2D/3D views, KLayout layers, hierarchy and density analysis for ASIC and EBL.
03 LITHO lithoforge DIY lithography toolkit for MSLA printers: mask design, OPC, process calculators, spacer lithography.
04 PROCESS litho-agent Process calculators plus a Claude-powered agent for lithography, oxidation, ion implantation and yield analysis.
05 YIELD semiyield Process simulation, ML yield prediction, SPC and Bayesian DOE in one Python toolkit. Live demo ↗
06 TEST cms-hgcal-readout ECON-D/T frame decoder and noise characterisation for CMS HGCAL prototype readout (lpGBT chain, VHDL firmware stubs).

Also on the line

Repository What it does
engineering-mcp-extensions MCP integrations for Ansys Lumerical, Mechanical and Fluent inside VS Code Copilot.
awesome-semiconductor-industry-topics Curated resources with a bias toward sub-10 nm logic, lithography, process technology and advanced packaging.
argus-digest Static news digest for semiconductor, AI and software topics, with a searchable archive.
elastocaloric-heat-pump Low-cost elastocaloric heat pump research with polymer films: thermal/mechanical behaviour and a small cooling demonstrator.

03 · Layer stack

What I work on, top metal to substrate.

Layer Focus Details
M2 Applied ML Yield prediction · statistical process control · Bayesian DOE
M1 Analog IC design SkyWater SKY130 open PDK · ngspice · LibreLane / OpenROAD
POLY Lithography Resolution & DoF · OPC · GDSII · e-beam lithography
DIFF Process modeling Deal–Grove oxidation · ion implantation · plasma etch
SUB Device physics Superconducting Lenz-lens resonators for NMR signal enhancement (IMT, KIT)

04 · Toolchain

Simulation ngspice COMSOL Ansys
Layout & PnR KLayout LibreLane / OpenROAD SKY130 GDSII
Hardware VHDL Vivado / Vitis lpGBT
Analysis NumPy SciPy XGBoost Streamlit
Software Python, C++, TypeScript, React, Node.js, Docker, Git, Linux, LaTeX, MATLAB

05 · Activity

Contribution chart

Top languages

06 · Wafer map

Wafer map of all public repositories binned by domain: 10 semiconductor and physics, 10 developer tools, 8 games, 4 math, 3 web, 5 forks
Bins 2–6: developer tools, games, math, web and forks

Bin 2 · Developer tools

Project What it does
claude-code-hooks Safety hooks for Claude Code. Stops rm -rf, force-push to main, and API key commits before they happen.
electron-win-template Electron starter template for Windows apps with NSIS installers, GitHub Releases, and automatic updates.
hackxplore-template HackXplore 2026 Starter Template: FastAPI + Streamlit + OpenCV + Anthropic
kit-campus-mcp MCP server for the KIT Campus portal: exam results, registrations, study progress, timetables, and module catalogues.
memecoin-freqtrade-bot Virtual paper-trading bot for memecoins on Freqtrade with real fees.
mineblade Free one-click Minecraft server hosting on your own machine.
obsidian-vault-dashboard Interactive Obsidian plugin: live vault stats, force-directed knowledge graph, tag cloud, and recently modified notes.
pgspy Transparent PostgreSQL proxy with a live query dashboard, query timing, and N+1 detection for application development.
study-tutor Claude AI exam tutor as an Electron desktop app: per-module chats, PDF lecture upload with prompt caching, LaTeX rendering, exam question generator.
youtube-playlist-downloader YouTube playlist downloader: MP3 with cover art, 1080p video and ZIP64 archives. C++17 backend, browser UI, Docker self-hosting.

Bin 3 · Games

Project What it does
aggressor-chess-web Browser chess game with a JavaScript AI engine, minimax search, alpha-beta pruning, and adjustable difficulty.
balatro-web Play the Balatro GBA fan demake instantly in your browser, on PC and mobile.
call-center-tycoon Satirical tycoon simulation game for Windows, built with Electron.
neon-harbor Open world neon city action game. Procedural city, car chases, five star wanted system. Godot 4.6, zero binary assets.
neon-pulse A precision-dash roguelike in a neon-drenched void. Electron desktop app with procedural audio and achievements.
sudoku-online-download Download page for the Sudoku Online Android app, with an APK, version metadata, and privacy information.
SudukoOnline Multiplayer Sudoku, TicTacToe, and board game platform for Android: Firebase real-time sync, league system, AI opponents.
tichu-stats Interactive Tichu statistics reference: bomb probabilities, Grand Tichu decisions, passing strategies, and source-linked tables.

Bin 4 · Math & learning

Project What it does
dtZahlensysteme Number system converter and learning portal (DE/EN): decimal, binary, octal, hex with step-by-step explanations.
erdos-notes Reproducible notes on Erdos problems 617, 835, 1221, and 550: partial results, statement corrections, and Lean proof audits.
mandelbrot-visualizer Interactive Mandelbrot set explorer for Windows: smooth zoom to 1000x+, zoom video recording, color schemes.
mathgpt-clone Full-stack AI math solver: text/LaTeX/image input and step-by-step solutions.

Bin 5 · Web & community

Project What it does
sudoku-online-privacy German and English privacy-policy pages for the Sudoku Online Android app.
HACK-OPS-KA/Website hack//ops community website for Karlsruhe: events, project archive, and a Firebase-backed event voting system.
hackops-ka/hackops-site hack//ops landing-page source for the Karlsruhe builder community.

Bin 6 · Forks & event archives

Project What it does
balatro-gba Fork of the Balatro Game Boy Advance fan demake.
erdosproblems Contribution fork of the community Erdos problems database.
SLOPATHON Contribution fork of the HACK//OPS SLOPATHON OP001 project archive in Karlsruhe.
winget-pkgs Contribution fork of the Windows Package Manager community repository.
HACK-OPS-KA/SLOPATHON Project archive for HACK//OPS SLOPATHON OP001 in Karlsruhe.

Open to collaboration on open-source EDA, process modeling and semiconductor tooling.
Artwork is generated by profile/art/build.py.

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