Finance Assistant London, United Kingdom

PhysicsX is a deep-tech company with roots in numerical physics and Formula One, dedicated to accelerating hardware innovation at the speed of software.

We are building an AI-driven simulation software stack for engineering and manufacturing across advanced industries. By enabling high-fidelity, multi-physics simulation through AI inference across the entire engineering lifecycle, PhysicsX unlocks new levels of optimization and automation in design, manufacturing, and operations — empowering engineers to push the boundaries of possibility. Our customers include leading innovators in Aerospace & Defense, Materials, Energy, Semiconductors, and Automotive.

The Role

PhysicsX is seeking a full-time Finance Assistant to play a key role in supporting our rapidly growing business. This is an excellent opportunity for a recent graduate or someone in the early stages of their career to build strong foundations in finance and accounting, while gaining hands-on experience across core finance processes.

You’ll be closely involved in the day-to-day running of our finance function, from transactional processing through to supporting month-end close, with full training and guidance provided. You’ll be working as part of a small finance team of three that has been built from the ground up, giving you exposure to how a modern finance function is structured and scaled in a high-growth business. This role is ideal for someone keen to pursue an accountancy qualification (ACCA/ACA) and develop their skills across both transactional and management accounting.

Responsibilities

Day-to-day transactional finance:

• Managing the accounts inbox, coding and processing supplier invoices.
• Preparing and assisting with bi-weekly supplier payment runs.
• Employee expense processing and checking compliance with company policy.
• Supporting customer invoicing, cash allocation, and credit control.
• Assisting with supplier and customer onboarding.

Month-end and reporting support:

• Preparing journals including accruals and prepayments.
• Maintaining the fixed asset register.
• Performing reconciliations (bank, supplier, customer, intercompany).
• Assisting with the preparation of management accounts and month-end packs.
• Helping to investigate variances and provide commentary.
• Supporting process improvements to strengthen controls and efficiency.
• Assisting with the implementation of cost control and departmental reporting.
• Taking on ad hoc finance projects as the business grows.

What makes a great candidate

• Recent graduate or early-stage junior accountant, ideally studying or interested in studying ACCA/ACA.
• Some prior experience in finance, accounting, or bookkeeping (internship, placement, or junior role) desirable.
• Experience with Xero or similar accounting software is beneficial.
• Detail-oriented, reliable, and diligent in maintaining accuracy.
• Strong organizational skills — able to prioritize and manage deadlines.
• Collaborative and approachable, with a “make it happen” attitude.
• Comfortable in a dynamic, fast-paced startup environment where priorities may shift.

What we offer

• Equity options – share in our success and growth.
• Full study support towards accounting qualifications.
• 10% employer pension contribution – invest in your future.
• Free office lunches – great food to fuel your workdays.
• Flexible working – balance your work and life in a way that works for you.
• Hybrid setup – enjoy our new Shoreditch office while keeping remote flexibility.
• Enhanced parental leave – support for life’s biggest milestones.
• Private healthcare – comprehensive coverage
• Personal development – access learning and training to help you grow.
• Work from anywhere – extend your remote setup to enjoy the sun or reconnect with loved ones.

We value diversity and are committed to equal employment opportunity regardless of sex, race, religion, ethnicity, nationality, disability, age, sexual orientation or gender identity. We strongly encourage individuals from groups traditionally underrepresented in tech to apply.

We are an equal opportunities employer and welcome applications from all qualified candidates. We collect diversity and inclusion data solely for the purpose of monitoring the effectiveness of our equal opportunities policies and ensuring compliance with UK employment and equality legislation.