I take electronic products from schematic to production — PCB and signal integrity, embedded firmware, and the optical link layer most hardware engineers never touch. Ten years across electronics and telecom, including a 4.25 Gbps SFP+ transceiver, a nationwide DWDM deployment, an SNMP platform running 2,000+ nodes, and an optical-fibre MRI receive coil.
Based in Toronto. Open to embedded/hardware roles in the GTA or remote, and taking on freelance projects.
| Optical systems | CWDM/DWDM · coherent optics · AWG · SFP/SFP+/XFP · link design and performance testing |
| Embedded platforms | ESP32 · ARM · PIC · embedded Linux · FreeRTOS · ESP-IDF · Particle · Quectel |
| PCB design & integrity | Signal and power integrity · impedance-controlled routing · HDI · EMC/EMI · thermal · UL/FCC |
| Languages | C · C++ · C# · Python · JavaScript |
| Interfaces | I²C · SPI · UART · CAN bus · USB · Ethernet · Wi-Fi · SNMP · OTA over LTE and CAN |
| Bench | Oscilloscope · logic and spectrum analyzer · OSA · OTDR · optical power meter · VOA · splicer |
| Repository | What it is |
|---|---|
| maiman-studio | Modular Python simulator for optical communication links and photonic systems — multi-band signal model, adaptive split-step fibre propagation, coherent DSP to 256 Gb/s DP-256QAM. |
| blender-exploded-assembly-studio | Blender add-on for exploded-view animation of PCBs, enclosures and mechanical assemblies, with automatic camera framing. |
| shahmohammadi.dev | This site. Astro, Tailwind v4, GSAP, and a Typst résumé generated from the same JSON the pages render. |
| xlocaltime-extension · xtab-extension | Small browser extensions. |
Most of my work is hardware under NDA, so the schematics, layouts and firmware behind the projects below are not here. The write-ups are — block diagrams, outcomes, and the engineering reasoning.
| Project | Year | |
|---|---|---|
| PoE Paging Amplifier and VoIP Gateway | 2026 | i.MX8M Mini carrier board on embedded Linux; power, network and audio down one PoE cable |
| Maiman Studio | 2026 | Modular simulator for optical links and photonic systems |
| Multi-Protocol IoT Gateway | 2024 | CAN, BLE and cellular on one gateway, updated over the bus itself |
| MRI Radio Coil with Optical Transmission | 2015 | SDR digitizing coil signals at 63.875 MHz over fibre, replacing coax |
| SFP 4.25G Transceiver | 2015 | 4.25 Gbps SFP on a four-layer Altium design, ROSA/TOSA characterization |
shahmohammadi.dev · Résumé (PDF) · LinkedIn · Upwork · ehsun.ca@gmail.com