Ajax Systems

European security systems maker, smart homes

Mechanical Engineer - CH

Design EngineeringConfirmed live in the last 24 hours

Full-timeNo salary listed

About the Job

Requirements

Experienced in mechanical engineering for consumer electronics and lifecycle product design.
Proficient in SolidWorks, primarily solid modeling, with basic surface modeling and sheet metal modeling knowledge.
Able to create precise assemblies, constraints, tolerance verification, and models for molding production.
Able to break complex projects into sub-units using reference geometry and configurations.
Knowledge of mold design, including opening directions, gating points, parting lines, and risks of short shots and air pockets.
Experience optimizing designs for scalability and cost reduction, including minimizing part count and weld lines and shortening cycle time.
Experience working with factories in Ukraine and China, understanding mold lifecycles, and participating in modifications after T1/T2.
Knowledge of metal processing technologies including bending, stamping, laser cutting, and milling for internal frames and auxiliary parts.
Understanding of Chinese manufacturers’ drawing interpretation, confirmation processes, production structures, and business communication practices.
Familiarity with Chinese documentation formats and tools for exchanging PDFs, STEP files, Excel specifications, and compressed archives.
Able to manually inspect and assemble products and analyze critical nodes; identify and resolve sealing, play, and fit issues.
Skilled in using measuring tools such as calipers, micrometers, and gauges.
Knowledge of ABS, PC, PC+ABS, PA+GF, TPE, and TPU properties, including shrinkage, impact strength, heat resistance, and elasticity.
Understanding of material behavior under production and operating conditions including temperature, humidity, and UV exposure, and ability to balance cost, quality, and manufacturability in material selection.
Able to develop fasteners, clips, guides, seals, TPE/TPU elements, and mounting slots.
Knowledge of designing buttons, indicators, light guides, ports, and ventilation openings; sealing methods and IP54–IP67 protection standards; heat dissipation; and battery compartments.
Understanding of Chinese factory constraints such as wall thickness, micro gaps, welding, and assembly limitations.
Able to design for repairability and ease of assembly in outsourced Chinese facilities.
Able to generate 2D outlines, tolerance tables, bills of materials, and assembly specifications; prepare technical descriptions, QC materials, and assembly instructions; and control design documentation.
English B2+ proficiency for oral and written technical communication with Chinese suppliers.
Experience communicating with Chinese engineers, managers, and production teams through Alibaba, WeChat, email, and video calls.
Able to use SolidWorks PDM, Excel, Google Docs, and project management tools such as Asana, Trello, or Notion.

Responsibilities

Complete lifecycle design of plastic enclosures and mechanical assemblies for consumer electronics.
Develop design-for-manufacturing and design-for-handling solutions considering mass-production processes, including plastic injection molding, assembly, sealing, and serviceability.
Collaborate with hardware and embedded engineers, industrial designers, technologists, quality control, and manufacturing departments.
Design ergonomic, intuitive solutions adapted to different operating environments.
Prepare production-transfer documentation, including 2D drawings, specifications, technical requirements, and 3D mold models.
Support mold development and approve modifications after initial mold trials (T0–T2), including defect analysis.
Participate in prototype and production testing and feedback, incorporating design improvements.
Verify that finished products comply with expected technical parameters, including stiffness, assembly, weight, and IP protection.
Oversee product lifecycle from concept to mass production, including cost analysis and assessment of design decisions’ impact on production costs.
Communicate with Chinese factories on technical specifications, drawing reviews, change control, and prototype and production-sample feedback.
Assess manufacturing risks in China, including equipment limitations, mold quality, shrinkage, production tolerances, and the effects of packaging and logistics on design.
Inspect samples from China, analyze defects such as shrinkage, warping, and poor casting, perform initial product assembly, and report recommendations.
Assess scaling challenges in China, including timeline tracking, mold duplication, and price optimization.
Communicate by email, video calls, and document comments in English, and edit specifications based on feedback from the Chinese side.
Participate in mold development discussions on steel selection, cost estimation, gating points, and parting lines.
Implement changes based on prototype or production feedback.

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:

SolidWorks (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 slots.
Design of interface elements: buttons, indicators, light guides, ports, and ventilation openings.
Knowledge of sealing methods and IP protection standards (IP54–IP67), heat dissipation, and battery compartment design.
Considering Chinese factory constraints: wall thickness, micro gaps, welding, and assembly limitations.
Designing for high repairability and ease of assembly in outsourced Chinese facilities.

📄 Documentation & Production Support:

Generation of complete documentation bundles: 2D outlines, tolerance tables, BOMs, assembly specifications.
Implementation of changes based on prototype or production feedback.
Participation in preparing technical descriptions for QC, assembly instructions, and design documentation control.

🌐 Communication & Tools:

English B2+ level – oral and written technical communication with Chinese suppliers.
Experience in communication with Chinese engineers, managers, and production teams (via Alibaba, WeChat, email, video calls).
Knowledge of Chinese business communication nuances: importance of confirmations, repetitions, and visual examples.
Use of SolidWorks PDM, Excel, Google Docs, Asana/Trello/Notion for project management.

About the Company

Ajax Systems

European security systems maker, smart homes

Ajax Systems designs and manufactures security systems for homes and businesses, focusing on products that integrate smart home capabilities. The company produces security hardware such as sensors and alarms that can work together as a system, usually managed through a centralized platform. Distinguishing factors include its European manufacturing base and specialization in security systems with smart home integration, catering to customers who want connected and remotely manageable protection. The goal is to provide reliable security solutions that combine traditional protection with smart, networked features for easier monitoring and control.

Company size: 1,001-5,000
Company stage: Late Stage VC
Total funding: $11M
Headquarters: Kyiv, Ukraine
Founded: 2011

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