CAD & SIMULATION ENGINEER

Product Design, Simulation

New Delhi | Full-time | 2-4 Years

ABOUT 7RD

7RD is a DeepTech defence company developing AI-enabled hard-kill technologies to counter the rapidly evolving threat of autonomous drones. Focused on safeguarding military installations, critical infrastructure, and forward borders, 7RD engineers advanced defence systems built for demanding real-world environments.

By combining expertise across mechanical engineering, electronics, embedded systems, autonomy, and simulation, the company develops robust, mission-critical technologies designed around the realities of up-to-date defence operations. With a focus on innovation, reliability, and rapid deployment, 7RD is building the next generation of counter-unmanned systems.

ABOUT THE ROLE

We are looking for a CAD & Simulation Engineer to convert product and system requirements into manufacturable mechanical designs and credible digital models.

The role spans mechanical CAD, design for manufacturing, structural and fluid analysis, simulation validation, AI training environments, and system simulation, with close collaboration across hardware, firmware, controls, autonomy, testing, manufacturing, and field teams.

KEY RESPONSIBILITIES

- Create parametric 3D CAD models, assemblies, mechanisms, enclosures, mounts, frames, fixtures, and production drawings with controlled revisions.
- Design components for additive manufacturing, machining, sheet fabrication, and rapid prototyping, accounting for tolerances, supports, orientation, finishing, and assembly.
- Develop production-ready components for injection moulding and scalable manufacturing, including draft, wall thickness, ribs, bosses, undercuts, parting lines, tooling constraints, and assembly features.
- Apply material selection, GD&T;, tolerance-stack analysis, fastening, sealing, surface finish, fit, and serviceability principles.
- Perform structural FEA covering stress, strain, displacement, contact, buckling, fatigue, vibration, thermal stress, and safety factors.
- Perform CFD and thermal analysis covering airflow, pressure drop, cooling, heat transfer, fluid forces, and environmental conditions.
- Validate simulation models through load-case definition, convergence and sensitivity analysis, engineering calculations, and test correlation.




- Build physically credible 3D AI training environments using Unreal Engine, NVIDIA Isaac Sim, or comparable platforms, including terrain, materials, sensors, assets, scenarios, collision, and synthetic-data generation.
- Develop software-in-the-loop and hardware-in-the-loop simulators for vehicles, robotic systems, sensors, actuators, communications, environmental conditions, and operator behaviour.
- Work with mechanical, electronics, firmware, controls, autonomy, testing, manufacturing, and field teams to resolve interfaces and engineering issues.

TECHNICAL EXPERTISE

CAD & Mechanical Design: Parametric solid and surface modelling, large assemblies, mechanisms, configurations, drawing release, revision control, and CAD data exchange.

Manufacturing Design: Additive manufacturing, machining, sheet fabrication, injection moulding, assembly, tooling, inspection, maintenance, and production design.

Mechanical Engineering: Materials, fits, fasteners, seals, GD&T;, datum schemes, tolerance stacks, surface finishes, clearances, and interface control.

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

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

AI & Simulation Environments: Unreal Engine, NVIDIA Isaac Sim, USD assets, materials, collision, sensor models, synthetic data, domain randomisation, and ground-truth generation.

System Simulation: Real-time physics, vehicle and robot dynamics, actuator and sensor models, scenario control, telemetry, SIL, HIL, and operator interfaces.

Programming: Python and C++ for simulation logic, automation, data processing, integration, and testing, alongside real-time platform scripting or visual scripting.

REQUIRED QUALIFICATIONS





- Bachelor's degree or diploma in Mechanical Engineering, Mechatronics, Aerospace Engineering, Automotive Engineering, Robotics, Simulation Engineering, or a related discipline.
- Demonstrated experience creating production-quality 3D CAD models, assemblies, drawings, and revision-controlled mechanical design packages.
- Practical understanding of rapid prototyping 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.
- Strong understanding of materials, fits, tolerances, engineering drawings, and mechanical interfaces with electronic, electromechanical, and structural components.
- Experience building or integrating interactive 3D environments, real-time simulations, or engineering visualisations using Unreal Engine, Isaac Sim, or a comparable platform.
- Working knowledge of Python or C++, along with source control, issue tracking, technical documentation, and design-review practices.

PREFERRED EXPERIENCE

Experience in one or more of the following areas will be valuable:

- Mechanical design for unmanned vehicles, drones, robotics, defence, aerospace, automotive, industrial, or other reliability-sensitive systems.
- Vibration, modal, fatigue, impact, nonlinear contact, thermal-stress, conjugate heat-transfer, or rotating-flow simulations.
- Tooling reviews, mould-flow awareness, supplier coordination, first-article inspection, tolerance studies, and manufacturing-driven design changes.
- Experience with URDF, SDF, USD, robot kinematics, actuator and sensor models, and interfaces with autopilot or control software.
- Synthetic-data generation, domain randomisation, photorealistic rendering, camera/LiDAR simulation, annotation pipelines, or simulation-based AI validation.
- Real-time simulation using Unreal C++, Blueprints, Unity, physics systems, environment and asset optimisation, networking, or scenario editors.
- Development of SIL/HIL simulators, including real-time telemetry, fault injection, replay, and performance measurement.

Apply here: https://7rd.zohorecruit.in/jobs/Careers/242596000000403032/CAD-and-Simulation-Engineer?source=CareerSite

📌 CAD and Simulation Engineer (Delhi)
🏢 7RD
📍 Delhi