The Opportunity

PhysicsX is looking for a Senior Financial Accountant to join our growing finance team. This is a technically demanding role for a qualified accountant who is confident working across complex, multi-entity, multi-jurisdiction accounting — and who wants to take genuine ownership of the processes they run.

You'll be a key part of a team of four, reporting directly to the Finance Manager, and acting as the point of contact for group tax and statutory reporting across our UK, US, and Singapore entities. You'll work closely with external tax consultants, auditors, and advisers, and be expected to take clear ownership of the workstreams you lead.

This is a role for someone who thrives on responsibility, brings fresh thinking to improve processes and controls, and has the technical depth to navigate regulatory complexity across multiple jurisdictions.

What You'll Do

Revenue recognition

• Leading global revenue recognition in line with FRS 102, ensuring accuracy and consistency with Group accounting policies across all entities.

Tax compliance and advisory

• Supporting group tax compliance across the UK, US, and Singapore — acting as the main point of contact between the business and our external tax advisers, and helping to ensure corporation tax returns and year-end filings, including federal, state, and local obligations, are completed accurately and on time.
• Managing VAT and GST compliance obligations across jurisdictions.
• Supporting R&D tax credit claims in collaboration with specialist advisers.

Accounts receivable

• Owning the AR function end-to-end — including customer invoicing, cash allocation, and credit control — ensuring timely and accurate processing.

Technical Accounting & Standards

• Maintaining compliance with complex accounting standards across the group, including lease accounting (IFRS 16) and share-based payments (IFRS 2).
• Assessing and implementing new or amended standards as they come into effect, ensuring Group accounting policies remain current and consistent.
• Acting as the internal point of reference for technical accounting queries across the business.

Statutory and regulatory reporting

• Leading timely and accurate statutory and regulatory reporting across the group, ensuring compliance with IFRS, UK GAAP, and relevant local standards.
• Providing audit support.

Controls and process improvement

• Building and evolving a robust but agile financial controls framework — strong enough for scale and audit-readiness, without slowing the business down.
• Partnering with the wider organisation to embed smarter financial processes, helping teams understand and adopt improved ways of working.
• Identifying and implementing process improvements to strengthen controls, efficiency, and reporting quality.

What Makes a Great Candidate

• A qualified accountant (ACA or ACCA) with at least four to five years of relevant post-qualification experience.
• Strong technical accounting knowledge — you're confident with IFRS, UK GAAP, and comfortable navigating multi-jurisdiction regulatory requirements.
• Demonstrable experience across tax compliance, revenue recognition, and statutory reporting — you'll be expected to bring technical confidence to these areas from day one.
• Experience in a technology, engineering, SaaS or high-growth start-up environment.
• Accurate and detail-oriented — you take pride in getting things right and spot inconsistencies others might miss.
• Able to own and execute workstreams independently, while working collaboratively as part of a team.
• Excellent organisational and time management skills — you prioritise effectively, manage competing demands, and consistently deliver to deadline.
• A proactive communicator — with both internal stakeholders and external advisers — who flags issues early and knows when to escalate.
• Comfortable in a fast-moving, high-growth environment where the landscape is constantly evolving.

Role Details

• Contract: Permanent, full-time
• Location: London - hybrid, with 3 days per week in the office
• Reports to: Finance Manager