ONE CHAIN. MANY LINKS. ONE TRUST.
Full-cycle electronics manufacturing partner in Europe
years of industrial experience
m² of production facilities
CPH
on 11 SMT lines
PCB assembly (SMT+THT)
Metal processing & powder coating
Box-build & final assembly
standards
ISO 9001, 14001, 45001, 27001, 50001, IPC-A-610, IATF 16949
for
mass
production
About us
As a proud part of the 4S4Group family, 4S4Production is the manufacturing heart behind our success
Located in Botevgrad, Bulgaria, our state-of-the-art facility produces a wide range of high-quality products, including smart LED lighting solutions for indoor and outdoor applications, smart energy meters, cash registers, and EV charging stations, ect.
But our expertise doesn’t stop there. We also serve as a trusted partner for contract electronics manufacturers, delivering precision and reliability across a variety of production areas ↓
Why European OEM's choose 4S4Production
Supply Chain & Risk Reduction
EU-based full-cycle EMS
One manufacturing partner across the entire value chain
Reduced interfaces, logistics complexity & operational risk
Short lead times, EU compliance, stable supply chain
Cost, Automation & Scalability
Competitive cost within the EU
High automation level (SMT, testing, assembly)
China-level automation combined with EU standards
Fast ramp-up from pilot to serial volumes
Quality, Engineering & Industrialization
ISO-certified quality processes & strict control
Strong engineering support: DFM → NPI → SOP
Stable serial production with documented processes
Financial Stability & Track Record
Long-term EMS partner
Independent manufacturing group with own investments
Financially stable, no outsourcing dependencies
Proven long-term projects for international OEMs
Services for clients
Prototyping & pilot production
Our prototyping workshop enables fast, flexible production of electronic and mechanical products — from first functional prototypes to pilot series, with in-house SMT assembly, rework, CNC machining and industrial 3D printing
PCB assembly (SMT+THT)
High-speed PCB assembling - cutting-edge SMT&THT solutions, ensuring precision and reliability for your electronic products. Testing & Final assembly. Prototyping - from idea to mass production
Metal processing & powder coating
We specialize in crafting products of any complexity using sheet metal, aluminum, and profiles with unmatched quality and attention to detail
Acrylic glass products & custom packaging solutions
Bring your vision to life with our custom-made acrylic glass products, crafted to meet the highest standards of design and functionality
Whether you need individual or group packaging, we deliver tailored solutions that protect and showcase your products effectively
Team
At our facility, we pride ourselves on a team of seasoned professionals. We bring unparalleled precision and skill to every project, ensuring the highest quality results
Partnering with us means fast and effective collaboration designed to meet your unique production needs
QC
Constantly maintained ISO certificates: 9001, 14001, 45001, 27001, 50001, IPC-A-610 and IATF 16949 in 2026
Automated 100% production control during the manufacturing process
In-house testing laboratory located in Sofia
Equipment
A vast park of the most modern and high-performance equipment for fulfilling orders of any complexity, from single items to large-scale production
Optimal logistical location in Europe
Our production facility is strategically located in Bulgaria, in the heart of Eastern Europe.
This prime location offers unparalleled convenience and efficiency for logistics, ensuring fast and cost-effective deliveries to partners across Europe and neighboring countries
RFQ & feasibility Check
RFQ / BOM / Gerber / Drawing/ NDA confirmation
Technical & capacity feasibility check
Clarification questions (DFM / DFA)
Costing &
commercial offer
Transparent quotation
Clear assumptions
Detailed cost calculation
Payment & logistics model
DFM / DFA & risk assessment
DFM / DFA report
Testability review
Supply-chain & component risk review
Pilot build & validation
Pilot / pre-series build
Process validation
Functional testing
Test reports
Process feedback & improvement
Industrialization & SOP preparation
Manufacturing instructions
Quality control plan
Test procedures
Logistics & delivery schedule
Serial production (SOP)
Stable serial production
Continuous quality monitoring
Delivery according to schedule
KPI-based reporting
Self-sufficient infrastructure
Reliable Power Supply
connected electrical capacity of 3 MW
Compressed Air and Nitrogen On-Demand
we power our production lines from our own compressor stations and nitrogen generators
Climate-Controlled Workspaces
efficient Heating System by an in-house gas boiler plant. Each production area is equipped with advanced climate control systems
ESD-Protected Zones
safeguarding sensitive electronic components during manufacturing
Where we are located
Head office & Testing laboratory
Sofia, BG -1528
2A Nedelcho Bonchev St.
phone: +359 2 968 6035
info@4s4group.bg
Manufacturing factory
Botevgrad, BG -2140
Industrial zone Microelectronics, st. Eng. Marin Marinov 3
phone: +359 883 688 677
info.production@4s4group.bg