Mechanical Draftsperson

SII Group; Belfast City District; On-site; GBP 30,000 - 45,000; Full time

Job summary

SII UK, a key aerospace/defence engineering partner, seeks an experienced Mechanical Draftsperson to support cross-functional projects. You will produce and review high-quality 2D drawings from 3D CAD models, ensuring BS 8888 compliance and clear documentation control.

You will collaborate with Mechanical Design Engineers to guarantee accurate, well-toleranced drawings and contribute to best‑practice guidelines and tolerance strategies across engineering teams.

Qualifications

• BS 8888 knowledge and practical application required.
• Proficiency in GD&T and tolerancing practices.
• Ability to review complex mechanical drawings from 3D models.
• Strong attention to detail and drawing quality.

Responsibilities

• Produce 2D drawings from 3D CAD models.
• Review drawings for accuracy and compliance.
• Ensure BS 8888 compliance.
• Check dimensioning, tolerancing and datums.
• Maintain document control and traceability.
• Provide guidance on GD&T.
• Support tolerance strategies.
• Continually improve drawing standards.

Skills

2D drafting

3D CAD models

BS 8888 knowledge

GD&T

Geometric tolerancing

Drafting standards

Documentation control

Attention to detail

Job description

We are looking for experienced Mechanical Draftsperson to support a Hardware Engineering function in the delivery of cross-functional engineering projects.

The role will focus on producing and reviewing high-quality mechanical engineering drawings, ensuring documentation meets BS 8888, internal quality requirements and applicable customer specifications.

You will work closely with Mechanical Design Engineers to ensure drawings are accurate, clearly presented, correctly toleranced and appropriately controlled.

KEY RESPONSIBILITIES

• Produce and support the creation of high-quality 2D mechanical engineering drawings from 3D CAD models.
• Review drawings produced by Mechanical Design Engineers for accuracy, clarity and compliance.
• Ensure mechanical drawings comply with BS 8888.
• Review drawing layouts, views, dimensioning, tolerancing and general drafting conventions.
• Review and challenge GD&T, datum structures and tolerancing approaches.
• Ensure appropriate use of feature control frames, geometric tolerances and MMC/LMC, where applicable.
• Ensure drawing revisions, title blocks, document control and traceability information are correct.
• Check drawings against internal QA requirements and applicable customer specifications.
• Provide technical guidance to engineering teams on the application of GD&T and BS 8888.
• Support engineers in developing appropriate tolerance strategies.
• Maintain strong CAD knowledge to investigate drawing or CAD-related issues.
• Develop and continuously improve mechanical drawing and documentation best-practice guidelines.

ESSENTIAL SKILLS & EXPERIENCE

• Strong mechanical engineering drafting/draughting experience.
• Excellent understanding and practical application of BS 8888.
• Strong understanding of GD&T and engineering tolerancing.
• Experience with datum structures, feature control frames, geometric tolerances and material conditions such as MMC/LMC.
• Experience producing detailed 2D engineering drawings from 3D CAD models.
• Strong CAD proficiency.
• Understanding of drawing revision control, document control and traceability.
• Ability to review and interpret complex mechanical engineering drawings.
• Experience working closely with Mechanical Design Engineers and other engineering stakeholders.
• Strong attention to detail and commitment to drawing quality and consistency.

With five strategic offices in Belfast, Chester, Farnborough, London and Oxford, we work in partnership with our customers UK-wide to deliver high-impact engineering solutions.

SII UK is a trusted Aerospace and Defence engineering partner, supporting the delivery of complex, mission-critical programmes while helping to shape the future of innovation across next-generation systems and technologies.

Our teams contribute daily to creating a fulfilling, stimulating and career development focused work environment.

True to our human-centred values, we are committed to making SII UK a Great Place To Work

Joining SII UK means being part of our collective goals, guided by our mission “Let’s Tech Together,” and helping to build a digital future that is sustainable, at the heart of an environment that values learning & collaboration.