Esju is now part of Flex Ltd.


Esju, based in Oulu Finland, provides electronics product development, consultancy, research and training as well as EMC laboratory services with offerings across RF, EMC, electromechanics and embedded systems.


  • System architecture: 2G, 3G, 4G, 5G & WiFi
  • Schematic & Layout Design
  • RF Power Amplifiers (< 200 W)
  • TRx design
  • Mechanics design
  • Digital design (Baseband)
  • FPGA & ASIC Design
  • Embedded SW design
  • Antenna design
  • Filter specification & verification
  • Module level testing
  • RF performance testing
  • Reliability & Environmental testing
  • EMC design & testing


Esju’s capabilities and product development expertise have now been fully integrated with Flex, the global Sketch-to-Scale® solutions provider. With approximately 200,000 professionals across 30 countries, Flex provides innovative design, engineering, manufacturing, real-time supply chain insight and logistics services to companies of all sizes in various industries and end-markets.

Visit our Communications Solutions page for more information about our design, development and manufacturing services in 5G, wireless infrastructure, IP and optical networking and more.

Check out our Careers and Locations pages for more information about Flex. To search for careers within the former Esju team, select the ‘Country’ field on the left and then select Finland.

Connect with Flex for more information or get in touch with the former Esju team: