Freelancer logo
Log In Sign Up
Post a Project

EXPLORE

Electrical Engineering Electronics Embedded Software Embedded Systems PCB Design and Layout
Profile cover photo
User Avatar

Yaroslav

@yaroslavmark

monthly-level-three.svg
4.9
11

5.7

5.7

100%

PCB Design Expert | PLC • Automation • Embedded

$35 USD / Hour

・

Flag of UKRAINE

Ukraine (4:15 PM)

・

Joined on November 23, 2025

$35 USD / Hour

・

Hello. I am an experienced Automation Engineer & Hardware Designer with 10+ years of expertise in PLC programming, industrial controls, embedded systems, and custom PCB development. I bring together both industrial automation and electronics engineering, allowing me to design complete control solutions — from PLC logic and HMIs to custom PCBs, sensor interfaces, power electronics, and machine-control hardware. 🧩 Core Competencies 🧩 🔧 PLC & Automation Engineering - Siemens: S7-1200 / S7-1500 / S7-300, TIA Portal, STEP7 - Allen-Bradley: ControlLogix, CompactLogix, MicroLogix (Studio 5000 / RSLogix) - Schneider Modicon, Mitsubishi FX/Q, Omron CJ/CP - HMI/SCADA: WinCC, FactoryTalk View, Ignition, Weintek, Delta - Communication: Modbus RTU/TCP, Profinet, EtherNet/IP, Profibus, OPC-UA - Industrial Controls - VFD/Servo setup (Siemens, ABB, Delta, Rockwell) - Sensor integration (analog, digital, RTD, thermocouple) - PID loops, motion control, interlocks & machine safety 📡 PCB & Electronics Design - PCB Design Tools: KiCad, Altium, Eagle / Fusion 360, Cadence Allegro - Hardware Expertise: Mixed-signal hardware (analog + digital), High-voltage / low-voltage mixed PCBs, SMPS power stages • DC-DC converters, Motor drivers, relays, MOSFET/PWM control, Microcontrollers: Raspberry Pi Pico, STM32, ESP32, AVR, PIC, Communication hardware: RS-485, CAN, Ethernet, isolated I/O, Sensor conditioning, ADCs, op-amps, filters, EMC/EMI-friendly layout & safety-critical design 🧰 Tools & Platforms - TIA Portal, STEP7, Studio 5000, RSLogix - WinCC, FactoryTalk View, Ignition SCADA - AutoCAD Electrical, EPLAN - C/C++ for embedded, MicroPython, FreeRTOS

Verifications

On time

100%

On budget

100%

Accept rate

87%

Repeat hire rate

13%

Freelancer Electronics Engineers Ukraine
See all Electronics Engineers in Ukraine

Portfolio

Portfolio

14008065
The board is designed to monitor the voltage and current on both the input and output sides of a high-power rotary switch. It can operate from a very wide range of power sources, including both AC and DC voltages, while deriving its own 5 V supply directly from the applied input voltage. An ESP32 microcontroller measures the electrical parameters and displays them on an OLED screen in real time. Because the power supply is non-isolated, the board must be properly enclosed and electrically isolated from user contact for safe operation.

Ultra-wide range DC regulator

The board is designed to monitor the voltage and current on both the input and output sides of a high-power rotary switch. It can operate from a very wide range of power sources, including both AC and DC voltages, while deriving its own 5 V supply directly from the applied input voltage. An ESP32 microcontroller measures the electrical parameters and displays them on an OLED screen in real time. Because the power supply is non-isolated, the board must be properly enclosed and electrically isolated from user contact for safe operation.

Ultra-wide range DC regulator

The board is designed to monitor the voltage and current on both the input and output sides of a high-power rotary switch. It can operate from a very wide range of power sources, including both AC and DC voltages, while deriving its own 5 V supply directly from the applied input voltage. An ESP32 microcontroller measures the electrical parameters and displays them on an OLED screen in real time. Because the power supply is non-isolated, the board must be properly enclosed and electrically isolated from user contact for safe operation.

Ultra-wide range DC regulator

The board is designed to monitor the voltage and current on both the input and output sides of a high-power rotary switch. It can operate from a very wide range of power sources, including both AC and DC voltages, while deriving its own 5 V supply directly from the applied input voltage. An ESP32 microcontroller measures the electrical parameters and displays them on an OLED screen in real time. Because the power supply is non-isolated, the board must be properly enclosed and electrically isolated from user contact for safe operation.

Ultra-wide range DC regulator

14008048
Designed for vending machines, this board combines ESP32 with 100Mb Ethernet with PoE, 4G cellular modem, and backup 18650 battery with charging circuit.

ESP32 IoT Gateway with 4G Modem

Designed for vending machines, this board combines ESP32 with 100Mb Ethernet with PoE, 4G cellular modem, and backup 18650 battery with charging circuit.

ESP32 IoT Gateway with 4G Modem

Designed for vending machines, this board combines ESP32 with 100Mb Ethernet with PoE, 4G cellular modem, and backup 18650 battery with charging circuit.

ESP32 IoT Gateway with 4G Modem

14008042
Raspberry Pi Compute Module 4 has 1 x PCIe Gen 2.0, which is useful for adding NVMe SSDs, GPU cards, and more. In this design, a 4-way PCIe Gen 2.0 switch / multiplexer is used to connect various PCIe peripherals of M.2 key M, M.2 key E, and mini-PCIe form factor.

Ras CM4 with 4-way PCIe Gen 2 Switch

Raspberry Pi Compute Module 4 has 1 x PCIe Gen 2.0, which is useful for adding NVMe SSDs, GPU cards, and more. In this design, a 4-way PCIe Gen 2.0 switch / multiplexer is used to connect various PCIe peripherals of M.2 key M, M.2 key E, and mini-PCIe form factor.

Ras CM4 with 4-way PCIe Gen 2 Switch

Raspberry Pi Compute Module 4 has 1 x PCIe Gen 2.0, which is useful for adding NVMe SSDs, GPU cards, and more. In this design, a 4-way PCIe Gen 2.0 switch / multiplexer is used to connect various PCIe peripherals of M.2 key M, M.2 key E, and mini-PCIe form factor.

Ras CM4 with 4-way PCIe Gen 2 Switch

14003680
ESP32 is used as main microcontroller with a poly-phase power meter AFE. The board has PoE and W5500 100Mbps PHY interface to do communication and to feed power. The ESP32 runs an embedded web server, which is developed in Svelte web framework.

ESP32 Poly-Phase Power Meter

ESP32 is used as main microcontroller with a poly-phase power meter AFE. The board has PoE and W5500 100Mbps PHY interface to do communication and to feed power. The ESP32 runs an embedded web server, which is developed in Svelte web framework.

ESP32 Poly-Phase Power Meter

13697912
I mentioned that we used E-Plan software for electrical drawings and panels. If you'd like to point out that, I'd like to share that we also develop e-Plain software.

PLC Panel

13697895
500W power output PCB design - AC-DC, DC-DC converter, Microcontroller(stm32f103), LM2596 adj, ultra-fast rectifier, etc. I designed a robust multi-power distribution board in Altium, covering schematic capture, PCB layout, power-stage validation, and complete fabrication outputs (Gerbers, drill, BOM, assembly drawings). My approach focuses on clean power-domain separation, proper thermal management, controlled routing for high-current sections, and test-friendly layout so the board is reliable and easy to integrate into your system. I will deliver an Altium project that is DRC-clean, electrically verified, and ready for manufacturing.

Multi Power Board Design with Altium

14008065
The board is designed to monitor the voltage and current on both the input and output sides of a high-power rotary switch. It can operate from a very wide range of power sources, including both AC and DC voltages, while deriving its own 5 V supply directly from the applied input voltage. An ESP32 microcontroller measures the electrical parameters and displays them on an OLED screen in real time. Because the power supply is non-isolated, the board must be properly enclosed and electrically isolated from user contact for safe operation.

Ultra-wide range DC regulator

The board is designed to monitor the voltage and current on both the input and output sides of a high-power rotary switch. It can operate from a very wide range of power sources, including both AC and DC voltages, while deriving its own 5 V supply directly from the applied input voltage. An ESP32 microcontroller measures the electrical parameters and displays them on an OLED screen in real time. Because the power supply is non-isolated, the board must be properly enclosed and electrically isolated from user contact for safe operation.

Ultra-wide range DC regulator

The board is designed to monitor the voltage and current on both the input and output sides of a high-power rotary switch. It can operate from a very wide range of power sources, including both AC and DC voltages, while deriving its own 5 V supply directly from the applied input voltage. An ESP32 microcontroller measures the electrical parameters and displays them on an OLED screen in real time. Because the power supply is non-isolated, the board must be properly enclosed and electrically isolated from user contact for safe operation.

Ultra-wide range DC regulator

The board is designed to monitor the voltage and current on both the input and output sides of a high-power rotary switch. It can operate from a very wide range of power sources, including both AC and DC voltages, while deriving its own 5 V supply directly from the applied input voltage. An ESP32 microcontroller measures the electrical parameters and displays them on an OLED screen in real time. Because the power supply is non-isolated, the board must be properly enclosed and electrically isolated from user contact for safe operation.

Ultra-wide range DC regulator

14008048
Designed for vending machines, this board combines ESP32 with 100Mb Ethernet with PoE, 4G cellular modem, and backup 18650 battery with charging circuit.

ESP32 IoT Gateway with 4G Modem

Designed for vending machines, this board combines ESP32 with 100Mb Ethernet with PoE, 4G cellular modem, and backup 18650 battery with charging circuit.

ESP32 IoT Gateway with 4G Modem

Designed for vending machines, this board combines ESP32 with 100Mb Ethernet with PoE, 4G cellular modem, and backup 18650 battery with charging circuit.

ESP32 IoT Gateway with 4G Modem

14008042
Raspberry Pi Compute Module 4 has 1 x PCIe Gen 2.0, which is useful for adding NVMe SSDs, GPU cards, and more. In this design, a 4-way PCIe Gen 2.0 switch / multiplexer is used to connect various PCIe peripherals of M.2 key M, M.2 key E, and mini-PCIe form factor.

Ras CM4 with 4-way PCIe Gen 2 Switch

Raspberry Pi Compute Module 4 has 1 x PCIe Gen 2.0, which is useful for adding NVMe SSDs, GPU cards, and more. In this design, a 4-way PCIe Gen 2.0 switch / multiplexer is used to connect various PCIe peripherals of M.2 key M, M.2 key E, and mini-PCIe form factor.

Ras CM4 with 4-way PCIe Gen 2 Switch

Raspberry Pi Compute Module 4 has 1 x PCIe Gen 2.0, which is useful for adding NVMe SSDs, GPU cards, and more. In this design, a 4-way PCIe Gen 2.0 switch / multiplexer is used to connect various PCIe peripherals of M.2 key M, M.2 key E, and mini-PCIe form factor.

Ras CM4 with 4-way PCIe Gen 2 Switch

14003680
ESP32 is used as main microcontroller with a poly-phase power meter AFE. The board has PoE and W5500 100Mbps PHY interface to do communication and to feed power. The ESP32 runs an embedded web server, which is developed in Svelte web framework.

ESP32 Poly-Phase Power Meter

ESP32 is used as main microcontroller with a poly-phase power meter AFE. The board has PoE and W5500 100Mbps PHY interface to do communication and to feed power. The ESP32 runs an embedded web server, which is developed in Svelte web framework.

ESP32 Poly-Phase Power Meter

13697912
I mentioned that we used E-Plan software for electrical drawings and panels. If you'd like to point out that, I'd like to share that we also develop e-Plain software.

PLC Panel

13697895
500W power output PCB design - AC-DC, DC-DC converter, Microcontroller(stm32f103), LM2596 adj, ultra-fast rectifier, etc. I designed a robust multi-power distribution board in Altium, covering schematic capture, PCB layout, power-stage validation, and complete fabrication outputs (Gerbers, drill, BOM, assembly drawings). My approach focuses on clean power-domain separation, proper thermal management, controlled routing for high-current sections, and test-friendly layout so the board is reliable and easy to integrate into your system. I will deliver an Altium project that is DRC-clean, electrically verified, and ready for manufacturing.

Multi Power Board Design with Altium

4.9 · 11 Reviews
11 Reviews
User Avatar
Flag of FRANCE

Antoine

5.0

€1,000 EUR

4 days ago

Stepper Motor Optimization for Radiator Valve

Great work ! Smooth exchange and proactive Project delivered in time

Electronics
Microcontroller
Embedded Software
Mechatronics
Electronic Design

+1 more

Share

User Avatar
Flag of ITALY

Davide

4.8

$425 USD

4 months ago

Milestone #1 - schematic design

Yaroslav is a reliable professional. He delivered the PCB design exactly as requested, meeting both the deadline and the agreed budget. The final deliverables were technically sound and according to the instructions provided. If you have clear requirements and need someone to execute the layout and routing efficiently, he is a solid choice. Thanks for the work!

Electronics
Electrical Engineering
Antenna Design
Embedded Systems

+1 more

Share

User Avatar
Flag of DENMARK

Mike Dahl

5.0

$1,075 USD

4 months ago

3D Model & EasyEDA PCB Updates

Fast response and very experienced engineer.! No need to spend lots of time explaining what you want. 5 stars from Denmark!!

3D Rendering
Solidworks
PCB Layout
Product Design
3D Modelling

+5 more

Share

User Avatar
Flag of FRANCE

Brian

5.0

€500 EUR

5 months ago

Custom ESP32-S3 Controller PCB

Yaroslav delivered a clean and well-organized 4-layer PCB design for a complex ESP32-S3 controller with LTE (BG95-M4), PoE, Ethernet, RS-485, and relay outputs. He proactively flagged component availability issues (BG95-M3 stock, ESP32 N32R8) and proposed solid alternatives. Strong technical skills, good communication, and production-ready JLCPCB files delivered on time. Will hire again.

Electronics
Electrical Engineering
PCB Layout
Circuit Design
DFM (Design for Manufacturing)

+2 more

Share

T
Flag of AUSTRALIA

Toby

4.6

$1,800 AUD

5 months ago

PCB Design for IoT Trap Monitor

Fantastic to work with, helped me though some last min changes, I would recommend to anyone with this kind of project

Firmware
Antenna Design
PCB Design and Layout
Cellular Modules
Power Supply

Share

Experience

PCB & Embedded Systems Engineer

Jan, 2021 - Present

•

5 years, 6 months

TechNova Automation Ltd.

Jan, 2021 - Present

•

5 years, 6 months

- I have designed over 60 custom PCBs for industrial automation, IoT, PLC expansion modules, and embedded controllers. - I have developed firmware for STM32, ESP32, AVR, and ARM-based systems. - I have led complete product cycles from schematic to manufacturing, including BOM optimization and DFM reviews.

Flag of UKRAINE

Kyiv, Ukraine

Jan, 2021 - Present

•

5 years, 6 months

Embedded Hardware Engineer

Feb, 2018 - Dec, 2020

•

2 years, 10 months

EuroLogic Systems

Feb, 2018 - Dec, 2020

•

2 years, 10 months

- I have designed multi-layer PCBs for motor control, power converters, and industrial signal conditioning. - I have Implemented RS-485, CAN, Ethernet, Modbus, and isolated I/O interfaces. - I have collaborated with firmware teams to optimize hardware–software integration.

Flag of UKRAINE

Lviv, Ukraine

Feb, 2018 - Dec, 2020

•

2 years, 10 months

PLC & Automation Engineer

Mar, 2016 - Jan, 2018

•

1 year, 10 months

Delta Industrial Controls

Mar, 2016 - Jan, 2018

•

1 year, 10 months

- I have developed and integrated PLC-based automation systems (Siemens, Omron, Allen-Bradley). - I have designed control panels, sensor interfaces, and industrial communication networks. - I have led commissioning and troubleshooting of field systems across multiple sites.

Flag of UKRAINE

Kharkiv, Ukraine

Mar, 2016 - Jan, 2018

•

1 year, 10 months

Education

Kharkiv national university of radioelectronics

2012 - 2016

•

4 years

Bachelor of Electrical and Electronic Engineering

Flag of UKRAINE

Ukraine

2012 - 2016

•

4 years

Certifications

P

Preferred Freelancer Program SLA

Freelancer logo US (International) / English
Help & Support

Freelancer

Categories Projects Contests Freelancers Enterprise Innovation Challenges AI Development Membership Preferred Freelancer Program Project Management Local Jobs Photo Anywhere Showcase API for Developers Get Verified

About

About us How it Works Security Investor Sitemap Stories News Team Awards Press Releases Careers

Terms

Privacy Policy Terms and Conditions Copyright Policy Code of Conduct Fees and Charges

Partners

Escrow.com Loadshift Warrior Forum

Apps

Apple App Store logoGoogle Play logo

Registered Users

Total Jobs Posted

Freelancer ® is a registered Trademark of Freelancer Technology Pty Limited (ACN 142 189 759)

Copyright © 2026 Freelancer Technology Pty Limited (ACN 142 189 759)