Senior Mechanical Design Engineer in Blaenavon

Company Description

GOS Tool & Engineering Services Ltd is a family-owned and managed engineering business operating from a 9-acre site near the historic Iron Works in Blaenavon, South Wales. The company is a market leader in the manufacture, conversion, and supply of road-rail equipment and bespoke construction machinery. GOS works with leading manufacturers such as Develon, Palfinger, Bosch Rexroth and others to deliver tailored solutions for specialist applications. From its UK base, GOS designs, manufactures, and exports innovative equipment worldwide, including RRVs, Trailers, Modular OTMs and ancillary equipment for the railway. In addition GOS have developed bespoke and novel machinery for UK Flagship projects.

Role Description

The Senior Mechanical Design Engineer will be responsible for the design and development of mechanical systems and components for road-rail and construction equipment in a full-time, on-site role based in the office in Blaenavon, NP4 9RL. Day-to-day responsibilities include creating detailed 3D and 2D designs, preparing engineering drawings and specifications, and performing calculations to ensure performance, safety, and compliance with relevant standards. The role involves collaborating closely with production, procurement, and project teams to refine designs for manufacturability, resolve technical issues, and support prototype build and testing. The engineer will contribute to product improvement initiatives, support bespoke customer projects, and provide technical input during design reviews and customer meetings. The position also requires maintaining accurate design documentation and supporting continuous improvement of engineering processes and tools.

Qualifications

• Candidates should possess strong Design Engineering and Product Design skills for developing robust, innovative mechanical solutions.
• Strong mathematical and analytical capability, with the ability to perform complex engineering calculations using first-principles methodologies.
• . Mechanical Engineering and Machine Design skills for selecting components, and ensuring reliability and safety.
• Candidates should possess proficiency in Computer-Aided Design (CAD) tools for 3D modeling, drafting, and producing manufacturing-ready documentation, preferably Solidworks.
• Candidates should possess experience with mechanical systems for industrial or heavy engineering, construction, or rail-related equipment, including materials selection and manufacturing processes.
• Candidates should possess strong problem-solving abilities, attention to detail, and the capacity to manage multiple projects and deadlines.
• Effective communication and collaboration skills, with the ability to work safely on-site and engage with cross-functional teams and customers, are important.
• Share knowledge, mentor junior engineers and designers, and contribute to a proactive learning environment.
• Participate in design reviews, risk assessments, safety studies, and constructability workshops to drive technical excellence and manage potential risks.
• Prepare, update and compile the latest assembly/build documentation (General assembly, sub-system assembly, schematics and build notes) and prepare a document pack prior to the start of build.
• Review and check technical documents, drawings, and calculations—supporting continuous improvement of design quality and compliance processes.
• Effectively manage own time in accordance with build schedule and priorities.
• Design for manufacturing experience
• Self-driven with ability to learn and lead
• Demonstratable experience in Fabricated sheet metal, bolted assemblies and machining designs.
• Strong understanding of Hydraulic design principles

Qualifications:

• BSc / Beng in Mechanical Engineering or similar
• Experience 5-10 years in mechanical design engineering roles.

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