Milan Rother
I build the simulation stack for electronics — fields, circuits, systems. State-of-the-art numerics, fast engines, and the interfaces to use them.
Who am I
Simulation engineer. I build numerical software and solve modeling problems for teams working on complex physical systems.
M.Sc. Electrical Engineering. Background in numerical methods, system modeling, electromagnetics, and compact modeling for physical systems.
I built PathSim because modeling software has a long history of vendor lock-in and clunky UX. Pure Python, open source, designed from first principles. JOSS-published, with collaborators from MIT Plasma Science & Fusion Center, CEA, scikit-rf, and JSBSim.
Now I'm bringing it all together into one vertically integrated stack: EM field solvers (RapidFEM, RapidMoM), a symbolic analog circuit engine (SANE), and system-level simulation (PathSim, FastSim). One architecture — SSA-style compute graphs at the heart of the engines, Rust cores, Python APIs, browser interfaces.
The Stack
One vertically integrated simulation stack for electronics — from electromagnetic fields to circuits to systems. Open source where it builds trust, source-available and commercially licensed where it creates value. Free for academia.
Systems
PathSim — pure-Python system simulation framework, MIT open source, JOSS-published. FastSim — drop-in Rust replacement, 50-100x faster, JIT, autodiff, FMI 3.0, C99 code generation. PathView — browser-based visual model editor.
Circuits
SANE — Symbolic Analog Network Engine. Symbolic and numeric circuit analysis: DC, transient, AC, poles/zeros, noise, harmonic balance, exact sensitivities. SPICE and Verilog-A frontends. Validated against ngspice and Xyce.
Fields
RapidMoM — 2.5D Method-of-Moments solver for planar RF passives on layered substrates. RapidFEM — Maxwell FEM solver in Rust with frequency-domain and time-domain backends. RapidPassives — browser-based RFIC passive layout generation.
Foundations
RSLAB — sparse direct solver in pure Rust. RapidMesh — tetrahedral mesh generator for 3D electromagnetic FEM.
Other Projects
Services
I help engineering teams build and scale simulation infrastructure. Available for consulting, development, commercial licensing, and training.
Simulink migration, custom simulation development, digital twin and co-simulation architecture, simulation audit, training and workshops.
Get in Touch
Have a project in mind or want to discuss your simulation challenges?
Contact: info@milanrother.com