CAD and Simulation Engineer

7RD; Delhi; On-site; INR 900,000 - 1,500,000; Full time

Job summary

7RD is seeking a CAD and Simulation Engineer to translate product and system requirements into manufacturable mechanical designs and robust digital models. You will own CAD work, FEA/CFD analysis, and simulator integration with hardware and autonomy teams.

The role involves building AI training environments in Unreal Engine or Isaac Sim, performing validation, and collaborating with multidisciplinary teams to ensure design integrity and manufacturability.

Qualifications

• Bachelor's degree or diploma in Mechanical Engineering, Mechatronics, Aerospace Engineering, Automotive Engineering, Robotics, Simulation Engineering, or closely related discipline.
• Experience creating production-quality 3D CAD models, assemblies, drawings, and revision-controlled mechanical design packages.
• Practical understanding of rapid-prototyping methods and production-scale manufacturing (additive manufacturing and injection moulding).
• Experience performing structural FEA and CFD or thermal analysis, including model setup, meshing, convergence checks, interpretation, and reporting.
• Ability to select materials, define fits and tolerances, read engineering drawings, and design reliable interfaces with electronic, electromechanical, and structural components.
• Experience building or integrating interactive 3D environments or simulations in Unreal Engine, Isaac Sim, or similar platforms.

Responsibilities

• Mechanical CAD: Create parametric parts, assemblies, enclosures, mounts, frames, fixtures, and production drawings with controlled revisions.
• Prototype design: Design parts for additive manufacturing, machining, sheet fabrication, and rapid assembly while considering tolerances and orientation.
• Production design: Develop parts for injection moulding and scalable processes with proper drafting and tooling considerations.
• Engineering definition: Apply material selection, tolerances, surface finish, and interface control requirements.
• Structural simulation: Perform FEA for stress, strain, buckling, and fatigue with proper validation.
• CFD and thermal analysis: Model airflow, cooling, and heat transfer to support design decisions.
• AI training environments: Build 3D scenes in Unreal Engine or Isaac Sim with synthetic-data outputs.
• System simulator development: Create software-in-the-loop and hardware-in-the-loop simulators.

Skills

CAD design

FEA

CFD/thermal

System simulation

Python scripting

C++ programming

Education

Bachelor's degree in Mechanical Engineering or related

Tools

Unreal Engine

NVIDIA Isaac Sim

Python

C++

Job description

7RD is building the Counter Drone Swarm Stack, powered by our core product: an EdgeAI Module for drones, a neural chip based "brain" that runs autonomous mission planning, target tracking, and navigation entirely on the edge, with no cloud or GPS dependency.

Job Description

JOB DESCRIPTION

CAD and Simulation Engineer

Product Design, Digital Simulation and AI Environments

Location:

Employment Type:

Full-time

Experience Level:

2-4 Years

Department:

Engineering / Mechanical Design & Simulation

Role Purpose

The engineer will convert product and system requirements into manufacturable mechanical designs and credible digital models. The position requires practical ownership of CAD, design for manufacture, structural and fluid analysis, simulation validation, AI training environments, and simulator integration with hardware, firmware, controls, and autonomy teams.

Key Responsibilities

Mechanical CAD: Create parametric parts, assemblies, mechanisms, enclosures, mounts, frames, fixtures, and production drawings with controlled revisions and clear design intent.

Prototype design: Design parts for additive manufacturing, machining, sheet fabrication, and rapid assembly while accounting for tolerances, supports, orientation, finishing, and iteration speed.

Production design: Develop parts for injection moulding and other scalable processes, including draft, wall thickness, ribs, bosses, undercuts, parting lines, ejector access, tooling constraints, and assembly features.

Engineering definition: Apply material selection, geometric dimensioning and tolerancing, tolerance-stack analysis, fastening, sealing, surface finish, fit, and serviceability requirements.

Structural simulation: Perform finite-element analysis for stress, strain, displacement, contact, buckling, fatigue, vibration, thermal stress, safety factors, and stress-relief design features.

CFD and thermal analysis: Model airflow, pressure drop, cooling, heat transfer, fluid forces, and environmental conditions; refine mesh, boundary conditions, and assumptions to support design decisions.

Simulation validation: Define load cases, simplify geometry responsibly, assess convergence and sensitivity, compare results with calculations or tests, and document model limits.

AI training environments: Build physically credible 3D scenes in Unreal Engine, NVIDIA Isaac Sim, or similar platforms with terrain, lighting, materials, collision, sensors, assets, scenarios, and synthetic-data outputs.

System simulator development: Create software-in-the-loop and hardware-in-the-loop simulators that model vehicle, robotic, sensor, actuator, communication, environmental, and operator behavior.

Cross-functional delivery: Work with mechanical, electronics, firmware, controls, autonomy, testing, manufacturing, and field teams to review interfaces, resolve faults, and maintain shared models and evidence.

Core Technical Areas

Area

Expected Knowledge and Application

Parametric solid and surface modelling, large assemblies, mechanisms, configurations, design tables, drawing release, revision control, and CAD data exchange.

Design for additive manufacturing, machining, sheet fabrication, injection moulding, assembly, tooling, inspection, maintenance, and cost-effective production.

Materials, fits, fasteners, seals, geometric tolerances, datum schemes, tolerance stacks, surface finishes, clearances, and interface control.

Structural FEA

Meshing, contacts, constraints, load cases, linear and nonlinear response, stress and strain, deflection, buckling, fatigue, vibration, and result validation.

CFD and thermal

Fluid domains, turbulence models, heat transfer, rotating or moving regions, pressure loss, cooling performance, mesh independence, and correlation with tests.

Unreal Engine and Isaac Sim scene construction, USD assets, materials, collision, sensor models, synthetic data, domain randomization, and ground-truth generation.

System simulation

Real-time physics, vehicle or robot dynamics, actuator and sensor models, scenario control, telemetry, software-in-the-loop, hardware-in-the-loop, and operator interfaces.

Programming and tools

Python and C++ for simulation logic, automation, data processing, integration, and test tooling, together with real-time platform scripting or visual scripting.

Requirements

Required Qualifications

Bachelor's degree or diploma in Mechanical Engineering, Mechatronics, Aerospace Engineering, Automotive Engineering, Robotics, Simulation Engineering, or a closely related discipline.

Demonstrated experience creating production-quality 3D CAD models, assemblies, drawings, and revision-controlled mechanical design packages.

Practical understanding of both rapid-prototyping methods and production-scale manufacturing, particularly additive manufacturing and injection moulding.

Experience performing structural FEA and CFD or thermal analysis, including model setup, meshing, boundary conditions, convergence checks, interpretation, and reporting.

Ability to select materials, define fits and tolerances, read engineering drawings, and design reliable interfaces with electronic, electromechanical, and structural components.

Experience building or integrating interactive 3D environments, real-time simulations, or engineering visualizations in Unreal Engine, Isaac Sim, or a comparable platform.

Working ability in Python or C++ and disciplined use of source control, issue tracking, technical documentation, and design review.

Preferred Experience

Mechanical design for unmanned vehicles, drones, robotics, defence, aerospace, automotive, industrial, or other reliability-sensitive systems.

Experience with vibration, modal, fatigue, impact, nonlinear contact, thermal-stress, conjugate heat-transfer, or rotating-flow simulations.

Tooling reviews, mould-flow awareness, production supplier coordination, first-article inspection, tolerance studies, and design changes based on manufacturing feedback.

Use of URDF, SDF, USD, robot kinematics, actuator models, sensor models, and interfaces to autopilot or control software.

Synthetic-data generation, domain randomization, photorealistic rendering, camera and LiDAR simulation, annotation pipelines, or simulation-based AI validation.

Real-time simulation experience involving Unreal C++, Blueprints, Unity, physics systems, environment and asset optimization, collision, animation, user interfaces, networking, or scenario editors.

Development of simulators with software-in-the-loop or hardware-in-the-loop integration, real-time telemetry, fault injection, replay, and performance measurement.