Electronics engineer reviewing PCB design and prototype validation in Shenzhen

Engineering-led electronics manufacturing services

EMS manufacturing in China and Thailand

Engineering, sourcing, PCB assembly, testing and box build — connected from NPI to production. Work with our Jiangmen and Rayong factories, supported by engineering and product development in Shenzhen.

Request a Quote Explore EMS services

Engineering & product development

Engineering behind your product

Connect hardware, PCB design and embedded firmware with prototype bring-up and manufacturing preparation. Our development examples include battery management and MPPT charging controls.

Explore the MS-BS200A BMS and power-conversion board shown here, or discuss the engineering work needed to bring your product into production.

MS-BS200A development example — MS-BS200A BMS and power-conversion board · Matsutake product materials

Project fit

Built for production-bound electronics projects.

Support for NPI, production transfer, complex assembly and repeat orders.

Design files ready for review, with expected quantities
Project goals and purchasing requirements to discuss
Open questions you want answered before commitment
Engineering and purchasing requirements for production

Explore the complete EMS path

Concept illustration of a PCB, project folder and drawings at an engineering review bench

Illustrative concept

EMS capabilities

Find the manufacturing services your project needs.

Explore NPI, component sourcing, PCB assembly, testing, box build and repeat production.

Concept illustration of a PCBA functional test fixture in a laboratory

Connected EMS services

NPI review, sourcing, assembly, test and integration as one path
Review the requirements and available evidence for each service
Connect assembly, inspection and integration around your product

Concept illustration of a high-density printed circuit board assembly

Your EMS manufacturing path

From your design to production and delivery

Six connected stages, supported by quality controls throughout the build.

Engineering Review

Define product requirements and review design files, BOM, manufacturability and test needs.

Materials & Sourcing

Agree purchasing responsibilities, material availability and approval of alternative parts.

NPI & Pilot Build

Prepare processes, fixtures and tests. Verify the pilot build and close findings before release.

PCB Assembly

Build SMT and through-hole assemblies to approved instructions, with in-process inspection.

Testing & Integration

Verify electrical and functional requirements; integrate enclosures and cables when needed.

Delivery & Repeat Production

Complete outgoing checks, packing and traceability; manage repeat orders and engineering changes.

Engineering, sourcing and production preparation can run in parallel. The starting point and integration work depend on your product and project stage.

China + Thailand

Manufacturing in China and Thailand

Manufacturing in Jiangmen and Rayong, with engineering and sourcing coordinated through Shenzhen.

SMT production line and equipment in Jiangmen, China — Jiangmen, China
SMT production

SMT production environment in Rayong, Thailand — Rayong, Thailand
SMT production

Shenzhen coordinates engineering, sourcing and commercial work. The manufacturing route is reviewed for each project.

Explore our manufacturing network

Inside Keep Best

See the people and production behind your project

Watch the Keep Best company introduction, including a look inside our SMT production environment.

Explore our manufacturing locations and engineering support alongside the video.

Explore our factories

SMT production floor shown in the Keep Best company video

Video hosted on YouTube. Watch on YouTube

Quality, test and traceability

Quality control from incoming materials to shipment

Available documentation depends on the agreed project scope and may include design files, manufacturing process records, inspection and test records, and change records.

Your project inputsReleased design, BOM and quantity context for the build

Our engineering workProcess controls and inspection steps applied to that scope

Your deliverablesAgreed records returned with the build for your review

Project considerationsInspection and test requirements are agreed for your build

Industries

Manufacturing plans shaped by product risk.

Industrial automation, automotive and power/energy paths connect application constraints to EMS decisions.

Share operating requirements alongside your design files
Risk topics mapped to sourcing, assembly and test decisions
Explore the manufacturing requirements of each application
Suitability for your product is confirmed in review

Explore supported industry contexts

Concept illustration of an industrial robot in a guarded assembly cell

Illustrative concept

Technical resources

Prepare a supplier decision your teams can compare.

A featured RFQ toolkit leads into testing and supplier-evaluation guides.

Concept illustration of an RFQ folder, blank documents and a circuit board

Featured

RFQ checklist to help you prepare a complete enquiry
Testing-method guide for defining evidence scope
Supplier-evaluation framework for structured comparison

Use the technical decision resources

Common questions

Questions buyers usually ask first.

Quick answers, with links to more detail.

What kind of project fits Keep Best?

Production-bound PCBA programs: prototypes or NPI builds with a credible path to repeat production, and released products that need controlled sourcing, assembly and test. Hobby orders and bare-PCB-only work are outside the scope of this site.

Where does a quote request go?

Every request enters the engineering readiness review described on the Request a Quote page: completeness is checked first, missing inputs are listed, and the recommended next step is stated before any pricing discussion.

How is the China or Thailand site chosen?

Jiangmen and Rayong are both reviewed as production routes against product, sourcing, process, test, commercial and compliance inputs. The allocation decision is documented with its reasons; no site is assigned by default.