Circuit design & schematic review
Electronic circuit design, component selection, power and signal checks, and schematic review before PCB layout.
Electronics engineering · Fiverr Level 2
PCB design. Electronics manufacturing. Complete devices.
I’m XIANJUN, with 20 years of electronics design experience and 7 years in AI applications. I help founders and engineering teams take circuit design, PCB layout and embedded firmware from an idea to a complete product.
I work with professional manufacturing partners in China to provide a one-stop service: PCB fabrication, PCB assembly (PCBA), 3D-printed enclosures, complete device assembly and international shipping.
Designed, built and assembled in China. Delivered internationally.
Completed Fiverr orders267
118 unique clients
Seller levelL2
Rating4.9 (154)
Updated 2026-09-06
Global clients
Engineering support across borders.
Clients in North America + Europe74%
Served countries: share of world land39.0%
Countries served37
Design & manufacturing
From circuit design to a finished device.
China’s well-developed PCB supply chain connects component sourcing, PCB fabrication, assembly and enclosure production. Working with specialist local partners lets me coordinate these steps efficiently, accelerate prototyping and move complete devices into production. Timing is confirmed against your design, materials and quantity.
PCB design & layout
PCB layout for prototypes and small production runs, connector planning, design-for-manufacturing review and board bring-up support.
Embedded firmware development
Microcontroller firmware, peripheral integration, hardware–software debugging and prototype testing. Share your target platform and required functions to define the scope.
PCB fabrication & turnkey PCBA
PCB manufacturing in China through professional partners, with component sourcing, BOM review and PCB assembly (PCBA). One coordinated path from bare boards to assembled electronics.
3D-printed enclosures
Enclosure 3D printing for electronic prototypes, with coordination of board fit, connector access and assembly requirements so the PCB and housing work together.
Complete device assembly & shipping
Box build assembly combines circuit boards, firmware, enclosures and wiring into complete devices. I coordinate final assembly, agreed functional checks, packing and international shipping through manufacturing and logistics partners.
From design to delivery
One contact from first brief to international delivery.
Define the requirements
Share your product function, target size, schematic or block diagram, BOM, quantity and deadline. For firmware, include the target hardware and interfaces.
Develop and review
Agree on the scope and deliverables, then work through circuit design, PCB layout or firmware development with technical feedback along the way.
Build, assemble and ship
Coordinate PCB fabrication, PCBA, enclosure 3D printing and complete device assembly with Chinese manufacturing partners. Follow agreed checks, packing and international shipping to your destination.
Client feedback
Feedback from Fiverr projects.
Client comments are shown in their original language.
★★★★★ 5.0
Very professional work and clear communication. The PCB design was delivered with careful attention to manufacturing details.Fiverr client
★★★★★ 5.0
Helped us compare suppliers in China and made the process much easier from overseas.Business client
★★★★★ 5.0
Fast response, strong technical knowledge, and patient explanations throughout the project.Electronics founder
FAQ
Before we start your project.
Can you help with circuit design and PCB layout?
Yes. I can review schematics, select components, plan PCB layout, check manufacturability and support prototype debugging.
Can you develop firmware for my hardware?
Share your microcontroller, existing code, required interfaces and product functions. We can define the firmware development, integration and testing work your project needs.
Can you provide complete electronics manufacturing in China?
Yes. I work with professional manufacturing partners in China to coordinate PCB fabrication, component sourcing, PCBA, 3D-printed enclosures, complete device assembly and international shipping. We agree the scope, checks, quantity and delivery requirements before production.
How does China’s PCB supply chain help speed up production?
China has a well-developed network for electronic components, PCB fabrication, assembly and enclosures. Local coordination helps connect these steps, resolve production questions quickly and shorten the path from prototype to complete device. Lead times depend on design complexity, material availability and order quantity.
Contact
Let’s build your electronics product.
Send your requirements, schematic or PCB files, BOM, firmware brief and enclosure needs. Include quantity, target schedule and shipping destination for a design, PCBA or complete device manufacturing quote.