OverviewSenior 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, and we value flexibility, collaboration, and continuous improvement.

The Senior HR Advisor will 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 and optical for you and your family

Learning and development autonomy to drive your own career growth

Flexible working to integrate work with life

Electric vehicle scheme salary sacrifice for sustainability

Generous holiday – 28 days + bank holidays

Life assurance and cycle-to-work scheme

Team events: summer socials, Christmas parties, and quarterly get-togethers

Key Responsibilities

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 KnowDue 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.

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