Signal integrity first
Layout follows schematic intent. Power, return paths and decoupling are budgeted before a trace is poured.
Open to new projects & collaborations
Embedded engineer from silicon to screen
I design the board, write the firmware, and build the application operators use every day — across medical devices, industrial automation and connected IoT products.
- 14+
- Years experience
- STM32
- Primary MCU family
- 3
- Industries shipped to
- End-to-end
- PCB → firmware → app
01 About
One engineer, the whole stack
A board that routes poorly becomes a firmware bug, and a firmware bug becomes an operator complaint. I work across all of it.
Fourteen years across medical devices, geotechnical monitoring, industrial automation and connected products.
The work runs the whole way down — schematic capture and PCB layout, firmware bring-up on STM32, and the desktop and web applications operators use every day.
Silicon & Board
Schematic capture, stack-up and layer planning.
Firmware
Startup, drivers, RTOS tasks and control loops.
Product
Enclosure, calibration, assembly and test fixtures.
Application
Operator UI, reporting and the systems around it.
Production-ready by default
A design is not done when it works on the bench. Test points, calibration and assembly steps are part of the deliverable.
Full-stack context
Firmware nobody can monitor is a liability, so the operator interface and reporting ship alongside the device.
02 Toolkit
What I work with
A working set, not a badge list — these are the tools actually used on recent boards, firmware and applications. Type to filter.
46 skills
Firmware & MCU
Bare-metal to RTOS- STM32F4xx
- Zephyr RTOS
- RTOS
- LL + HAL
- C / C++
- Register-level
- Device Tree
- Driver bring-up
Hardware & PCB
Schematic to fabrication- Altium Designer
- KiCad
- Schematic Design
- PCB Layout
- Signal Integrity
- Power Distribution
- ESD
- Soldering
- Calibration
IoT & Systems
Connected products- IoT Integration
- Home Automation
- Modbus
- Device Networking
- CCTV Systems
- Vertical Farming
- SBC / Linux
- Telemetry
Software & Data
Applications on top- C#
- .NET MAUI
- React
- Tailwind CSS
- Android
- Grafana
- REST APIs
- MIS / ERP
Computer Vision
Inspection & imaging- ROI Marking
- Image Alignment
- Thresholding
- Endoscopy Imaging
- Frame Processing
- Experimentation
Operations
Ship and support- Production Management
- Quality Management
- SOP Authoring
- Field Installation
- Team Leadership
- Training
- Procurement
03 Experience
Where I have worked
Fourteen years across the bench, the production floor and the design desk — summarised by the kind of work each role actually covered.
Head of Research & Development
Led hardware and firmware R&D for medical devices and endoscopy imaging systems — taking board designs from schematic to production, alongside quality management, technical documentation and field support.
- STM32F4xx
- Altium Designer
- Signal Integrity
- Power Distribution
- Quality Management
Embedded Engineer
Built embedded systems for geotechnical monitoring and OEM modules — programming, calibration and field trials on STM32 targets, with paired Android applications and manufacturing documentation ready for production.
- Embedded C
- STM32
- IoT
- Android
- Product Testing
- Manufacturing Docs
Electronic Production Supervisor
Ran PCB assembly through end-of-line functional testing — calibration, ESD control, material planning and production scheduling, then commissioning products on site and training the operators who run them.
- SOP
- Assembly
- Calibration
- ESD Control
- Procurement
- Field Installation
Software Engineer
Design and ship desktop, web and mobile applications on top of the hardware — real-time data acquisition, process monitoring and reporting that bridge operator workflows to backend services.
- C#
- .NET MAUI
- React
- Tailwind CSS
- PHP
- MySQL
- Grafana
04 Selected work
Boards, firmware and the apps around them
A cross-section of recent work — from multi-layer control boards with tight signal integrity budgets, to production applications and vision experiments.
Endoscopy Camera Control Board
Multi-layer control board for an endoscopy imaging system, built around an ARM STM32F4xx with camera control, illumination and data path management.
- Signal integrity and power distribution tuned across a dense, high-speed layout.
- Camera control, illumination and capture sequencing handled on the same MCU.
- Optimised layout for stable, repeatable performance in a medical-grade enclosure.
8-Channel Lighting Control I/O Board
MOSFET-based I/O board driving 8 lighting channels with an RTC acting as scheduler — fully programmable exposure and duty cycles without a host present.
- 8 independent MOSFET input/output channels with per-channel drive control.
- On-board RTC scheduler for autonomous, time-based operation.
- Designed for production: repeatable, testable and serviceable.
Automated Scope Washer Control
Control system for an automatic endoscope/scope washer — sequencing wash cycles, interlocks and fault handling without operator intervention.
- Deterministic cycle sequencing with safety interlocks.
- Fault detection and recovery paths designed into the state machine.
- Field deployed and commissioned on customer site.
Computer Vision Inspection Experiments
Self-directed experiments to understand computer vision methods for manufacturing inspection — from component-level ROI extraction to alignment and segmentation.
- Interactive ROI marking to pinpoint component pads dynamically.
- Robust image alignment and thresholding for consistent segmentation.
- Aimed at automated visual quality control on the production line.
QC Weighing Desktop Application
Cross-platform desktop application for real-time weighing capture and monitoring, built to simplify operator workflow and reporting in a QC process.
- Real-time data capture from weighing stations with instant monitoring.
- Streamlined operator workflow to reduce manual entry errors.
- Simplified report generation for the quality record.
Home Automation & Security Integration
Integrated home automation with burglar alarm, video door phone and CCTV monitoring for residential, hotel and apartment buildings.
- Unified control across lighting, access, alarm and video door phone.
- CCTV monitoring and recording integrated into the same management layer.
- Deployed and maintained across multiple building types and scales.
05 Contact
Let us build something reliable
Available for embedded firmware, PCB design and industrial software work. If it involves a board, a control loop or the interface operators use — I would like to hear about it.
- Emailjmldn.en@gmail.com
- GitHubnofosoft
- LinkedIn/in/jmldeen
- Based inBandung, West Java, Indonesia