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Contract Development and Assembly

LEJ provides 25+ years of expertise in design, development, assembly and quality assurance of complex electro-mechanical, opto-electronical and opto-mechanical sub-assemblies and systems. At LEJ you find the necessary know-how and equipment to successfully manage (time & costs) your projects ranging from Build-to-Print up to challenging design / development as well as assembly / testing.


  • Industrialization
  • Design for Manufacturability
  • Assembly processes

Design and Development+

  • Design & Development services
    • Electronics
    • Mechanics
    • Optics
    • Thermal Design
    • Software
    • System integration
  • Prototyping
  • Process engineering
  • Design to Cost
  • Design to Specification

Assembly and Testing+

  • Product Life Cycle Management
  • Logistics
  • Supply Chain Management
  • Quality Management / Assurance
  • Ramp-up / ramp-down

+ Supported by: Project- and Change-Management, Vendor auditing


The team at LEJ is technically adept to build your products according to your drawings as well as developing products according to your specification. As a system manufacturer ourselves we are capable of supporting you from ramp-up all the way through series production. Besides our competence in assembling complex systems, LEJ provides in-depth understanding in professional lighting and sophisticated electronics, resulting in high-precision, rock solid solutions.

With several thousand systems installed worldwide LEJ has proven to be the sustainable partner for OEM-Partners in various industries. LEJ maintains and continuously improves processes in order to holistically support your entire product life cycle.

DIN EN ISO 9001-2015 certificate

Projects / Products

  • Small / Medium quantities
  • Extended system complexity
  • Increased variety of product versions
  • Requirements for long-term availability

Development and Assembly of sub-assemblies & systems

  • Mechanical & electromechanical
  • Opto-mechanical
  • Opto-electronical
  • Power electronics


  • Medical Technology /Healthcare / Life Sciences
  • Analytical Instrumentation / Analysis Equipment
  • Semiconductor
  • Industry