4S4Production

4S4 Production is a full-cycle electronics contract manufacturer based in Bulgaria, delivering scalable and certified EMS solutions to OEMs across Europe and beyond. With 19+ years of experience, our 15,000 m² facility in Botevgrad houses 11 high-performance SMT lines capable of processing over 1,585,000 components per hour. We specialize in both SMT and THT PCB assembly for high-complexity and high-volume products — including servers, PCs, tablets, power supplies, and smart devices. Our integrated services include: • Prototyping and DFM consultation • SMT & THT assembly • Functional testing and BGA rework • Mechanical processing, welding & powder coating • Custom packaging and labeling • Full in-house testing (IPX, ESD, salt mist, vibration, insulation) • Automated ERP + WMS for zero-error production & real-time traceability We are certified to ISO 9001, 14001, 27001, 45001, and 50001. Our lab and production processes fully comply with EU standards for quality, environmental, safety, and information security. Let’s build your next generation of electronics — smarter, faster, and locally in Europe.