Senior Mechanical Engineer - Protonest (Pvt) Ltd

Protonest (Pvt) Ltd
Kottawa, Sri Lanka
Job Category: Mechanical & Electrical Eng.

SENIOR MECHANICAL ENGINEER

Experienced Level | Enclosure Design & Validation

Protonest is looking for an experienced Senior Mechanical Engineer to lead the design and validation of mechanical enclosures for our cutting-edge IoT devices. You will be responsible for balancing waterproofing, thermal performance, and manufacturability to deliver scalable hardware solutions.

What You'll Be Doing:

• Design enclosure architectures for IoT products with IP63–IP68 ratings.
• Create detailed 3D CAD models and 2D drawings with GD&T using SolidWorks.
• Develop components using plastic injection molding, die-casting, and sheet-metal fabrication.
• Perform tolerance stack-ups, drop/impact FEA, and thermal analysis.
• Prototype designs using SLA/FDM 3D printing and CNC machining.
• Lead DFM/DFx discussions and tooling reviews with manufacturing partners.
• Collaborate with electronics teams on RF, antenna, and EMC considerations.
• Execute rigorous validation tests including drop, vibration, salt spray, and water-jet testing.

What We're Looking For:

• Bachelor’s degree in Mechanical Engineering or a related technical field.
• Minimum 3 years of hands-on product design experience.
• Proven experience in delivering IP-rated enclosures for electronics or IoT.
• Deep understanding of sealing strategies such as gaskets, O-rings, and coatings.
• Experience working closely with manufacturing partners and external suppliers.
• Strong documentation skills (revision control, ECOs, and engineering reports).

Closing Date: January 24, 2026

Role Insights: Mechanical Engineering in the IoT Era

For a Senior Mechanical Engineer at Protonest, the challenge lies in miniaturization and protection. IoT devices often operate in harsh environments—from agricultural fields to industrial plants—requiring IP-rated enclosures that don't compromise the internal electronics' signal strength or thermal stability.

This role is pivotal because you aren't just designing a "box"; you are designing a high-performance system component that must be aesthetically pleasing, cost-effective for mass production, and rugged enough to withstand real-world use. Mastering DFM (Design for Manufacturing) is what separates a good design from a scalable product.

Interview Preparation Tips:

• Technical Portfolio: Prepare to showcase CAD screenshots or photos of previous IP-rated enclosures you have designed.
• Manufacturing Knowledge: Be ready to discuss specific tooling issues you've encountered and how you resolved them through DFM adjustments.
• Validation Processes: Discuss your experience with FEA (Finite Element Analysis) and how your simulations correlated with actual physical test results.
• Collaborative Design: Mention how you work with electronics engineers to ensure that mechanical mounts don't interfere with PCB layouts or antenna performance.

Looking for more?

Regularly check our platform for mechanical and hardware engineering vacancies. For guides on mastering SolidWorks for industrial applications, visit our Career Guidance Blog.