Mechanical Engineer Job Los Angeles area,California USA,Engineering

Ajax Systems is looking for an experienced Mechanical Engineer to join our team.

Ajax Systems is a developer and manufacturer of advanced security systems with smart home capabilities. We are a full-cycle product company from idea and engineering to mass production. Our portfolio includes 70+ devices that protect properties from intrusion, fire, and flooding, while also enabling smart control of electrical appliances.

Today, Ajax Systems protects over 2 million users in 169 countries worldwide and has received Europe's highest security awards. We are proud to be a Ukrainian success story, a company driven by innovation, resilience, and strong engineering culture.

Key Tasks:

Complete lifecycle design of plastic enclosures and mechanical assemblies for consumer electronics.
Development of DFM- and DFH-oriented solutions considering mass production processes (plastic injection molding, assembly, sealing, serviceability).
Collaboration with hardware and embedded engineers, industrial designers, technologists, quality control, and manufacturing departments.
Design of ergonomic, intuitive solutions adaptable to different operating environments.
Preparation of production transfer documentation (2D drawings, specifications, technical requirements, 3D models for molds).
Support of mold development and approval of modifications after initial mold trials (T0-T2), including defect analysis.
Participation in testing and feedback from prototypes and production, incorporating design improvements.
Verification of engineering compliance of the finished product with expected technical parameters (stiffness, assembly, weight, IP protection).
Oversight of the product lifecycle from concept to mass production, including cost analysis and assessment of the impact of design decisions on production costs.
Communication with Chinese factories: technical specifications, drawing reviews, change control, feedback on prototypes and production samples.
Assessment of manufacturing risks in China: equipment limitations, mold quality, shrinkage, production tolerances, and the influence of packaging and logistics on design.
Inspection of samples from China: defect analysis (shrinkage, warping, poor casting), initial product assembly, and reporting with recommendations.
Consideration of potential scaling difficulties in China: timeline tracking, mold duplication, and price optimization.
Continuous communication via email, video calls, document comments (in English), and participation in editing specifications based on feedback from the Chinese side.

Technical Knowledge and

Skills:

3D Modeling & Design:

Solid Works (95% solid modeling, 5% surface modeling), basic sheet metal modeling knowledge.
Creation of precise assemblies, constraints, tolerance verification, and preparation of models for molding production.
Ability to break down complex projects into sub-units, using reference geometry and configurations.

DFM / DFA / Manufacturing:

Knowledge of mold design: opening directions, gating points, parting lines, risks of short shots/air pockets.
Optimization for scalability and cost reduction (minimize part count, reduce weld lines, shorten cycle time).
Experience working with factories in Ukraine and China; understanding of the mold lifecycle; participation in modifications after T1/T2.
Basics of metal processing technologies: bending, stamping, laser cutting, milling for internal frames and auxiliary parts.
Understanding of Chinese manufacturers' practices: interpretation of drawings, overlooked details, confirmation processes.
Understanding of the Chinese production structure: project managers, engineers, suppliers.
Active participation in mold development discussions: steel selection, cost estimation, gating points, parting lines.
Familiarity with typical Chinese documentation formats: PDFs, STEP files, Excel specifications, compressed archives, WeTransfer/Alibaba Cloud.

Testing & Prototyping:

Manual inspection, assembly, and analysis of critical nodes.
Identifying and resolving sealing, play, and fit issues.
Skilled in the use of measuring tools: calipers, micrometers, gauges, etc.

Materials Science & Standards:

Properties of ABS, PC, PC+ABS, PA+GF, TPE, and TPU: shrinkage, impact strength, heat resistance, and elasticity.
Understanding material behavior during production and operation (temperature, humidity, UV).
Balancing cost, quality, and manufacturability when selecting materials.

Functional Elements:

Development of fasteners, clips, guides, seals, TPE/TPU elements, and mounting…