Yarn & Materials Developer

Essential Experience & Skills

• Minimum of 3 years' experience in material development, yarn development, seamless development, performance fabric development, or related technical product development.
• Strong technical knowledge of seamless materials, fibres, yarns, and knit constructions.
• Good understanding of seamless circular knitting technology, preferably Santoni or equivalent machinery.
• Knowledge of yarn covering methods, yarn draw-in processes, feeder allocation, plating, yarn pathing, and yarn tension principles within seamless circular knitting.
• Ability to assess how fibre composition, yarn selection, stitch architecture, elastane construction, and machine settings influence fit, compression, recovery, opacity, handfeel, durability, and production consistency.
• Strong understanding of seamless knit structures including rib, mesh, jacquard, tuck, float, plating, engineered ventilation, and body-mapped support zones.
• Good understanding of garment technology, seamless construction, fit, grading principles, and body-zone performance requirements.
• Strong knowledge of laboratory testing and commercial testing standards for performance activewear and seamless products.
• Ability to interpret laboratory testing, wear trial results, and supplier performance data to identify opportunities and resolve technical challenges.
• Good understanding of colouration, dyeing, and finishing processes relevant to seamless yarns and garments.
• Experience working directly with yarn suppliers and seamless manufacturing partners throughout the development lifecycle.
• Strong understanding of sustainable practices within yarn, material, and product development.
• Excellent communication and stakeholder management skills, with the ability to collaborate effectively across internal and external teams.
• Strong problem-solving skills and the ability to proactively identify risks and propose practical solutions.
• Excellent attention to detail, organisation, and technical documentation standards.
• Proficiency in Microsoft Office and PLM or similar product lifecycle management systems.
• Ability and willingness to travel when required.

Preferred

BELONGING AT GYMSHARK.

ABOUT US.

THE PERKS.

• Standard benefits include:
• Performance-based Bonus opportunity
• Funded Healthcare benefit
• 25 days holiday, additional day for your birthday & Bank Holidays
• Contributory Employer pension scheme
• Flexible benefits programme – including salary sacrifice EV scheme, dental insurance, cycle to work, tech scheme, holiday trading
• Gymshark Employee Discount & long service awards
• Access to High Street cashback and discounts
• Financial, Physical and Mental Wellbeing Support
• Enhanced Family Leave package
• Life Assurance
• Office location specific benefits include (HQ/IQ):
• Gym Membership to The Lifting Club (LC)
• Onsite lunch provision & coffee bars
• EV charge points available
• Note: The bonus program and benefits have certain eligibility requirements. Gymshark reserves the right to amend these programs in whole or in part at any time without advance notice.