Senior HR Advisor – Remote (Part-Time, Fixed-Term) | Up to £50,000 (pro-rated for part-time) Hours: 30 per week, across 4 or 5 days | Contract: 14-month Fixed Term At TwinStream, we bring technical excellence and exceptional service to our clients across government and industry. Founded in 2019 by engineers passionate about solving complex cross-domain challenges, we’ve grown into a dynamic consultancy where people are at the heart of everything we do. Our teams work both remotely and on client sites, but we’re united by a culture that values flexibility, collaboration, and continuous improvement. The Senior HR Advisor opportunity: We’re looking for a Senior HR Advisor to join our growing People team. This is a hands-on, varied role where you’ll be the go-to expert for HR operations, employee lifecycle processes, and compliance. If you enjoy shaping processes, building HR systems from the ground up, and making a tangible impact in a scaling organisation, this is the role for you. Why join us? * Competitive pension plan – 8% employer contribution * Private medical healthcare – including dental & optical for you and your family * Learning & development – autonomy to drive your own career growth * Flexible working – integrate work with life seamlessly * Electric vehicle scheme – salary sacrifice for sustainability * Generous holiday – 28 days bank holidays * Life assurance & cycle-to-work scheme * Team events – summer socials, Christmas parties, and quarterly get-togethers Key Responsibilities of the Senior HR Advisor: * Acting as the first point of contact for employee queries, providing expert guidance. * Drafting contracts, managing changes, and supporting smooth onboarding and offboarding. * Coordinating compliance checks and ensuring adherence to UK employment law and GDPR. * Managing and improving HR systems and people data, providing insights to the business. * Administering employee benefits and supporting cross-functional processes with Finance, IT, and Admin. * Leading process improvements in HR operations, including sourcing and implementing a new HRIS. * Partnering with the CPO on people-focused projects to support business growth. About you: * Strong experience in HR operations or generalist roles, ideally in a start-up or scaling business. * Solid knowledge of UK employment law and HR compliance. * Confidence working with HR systems (e.g. BambooHR, HiBob or similar). * A detail-oriented, process-driven mindset with the ability to streamline workflows. * Excellent communication skills and discretion when handling sensitive information. Important to know: Due to the nature of some of our clients, this role is subject to successful completion of a security screening process. Ready to shape the future of HR at TwinStream? Apply now and help us build a people experience that truly makes a difference