Junior Finance Assistant

Sinewave; Swindon; On-site; GBP 20,000 - 25,000; Full time

Job summary

A leading energy transformation firm in Swindon is seeking a Finance Assistant to support the Finance Team with sales and purchase ledger duties. The successful candidate will receive training, contribute to real projects, and have opportunities for career progression in accounting. A collaborative and inclusive work culture is emphasized, making it an ideal environment for recent graduates and those looking to pivot into finance.

Benefits

Supportive growth environment

Friendly team atmosphere

Qualifications

• Desire to start or progress an accounting qualification.
• Previous finance support experience is advantageous.
• Knowledgeable about business operations.

Responsibilities

• Create and process sales and purchase invoices.
• Allocate daily client receipts and debt collection.
• Ensure finance procedures are followed.

Skills

Proficient in Microsoft Office

Excellent communication

Intermediate MS Excel skills

Attention to detail

Teamwork abilities

Education

GCSE/A-Level Maths or equivalent

Degree or finance qualification (desirable)

Tools

Xero Accounting Systems

Job description

Sinewave was founded in 2015 with a clear mission from the very start - everything that we do will always be a power for good. Since then, we have grown from a start-up operating out of a living room to a leading force in the energy transformation sector. We are committed to helping power the future more sustainably and are proud to be the only B-Corp Certified ICP in the world.

We contribute to the UK's energy transition by providing innovative high and low voltage electrical solutions up to 400kV. Our services include EV charging, renewables, and commercial projects, focusing on designing, delivering, and maintaining networks with sustainability and efficiency at the core. Join us to drive change and make an impact!

Kickstart Your Career in Finance!

Are you a recent graduate, college leaver, or someone looking to start a career in finance? This is your chance to join a supportive and growing business where you’ll gain hands-on experience across the full finance function.

We’re looking for someone with a head for numbers, a keen eye for detail, and the ambition to learn. You’ll receive full training, work alongside experienced finance professionals, and have the opportunity to progress towards an accounting qualification - all while contributing to real projects from day one.

Whether you’ve just finished university, completed your A-Levels, or are looking to pivot into finance, we’ll give you the skills, experience, and support to thrive.

This role will support the Finance Team with Sales Ledger transactions, including sales, receipts, and payments allocations, as well as supporting Purchase Ledger transactions including Invoice Processing.

Everyone belongs here at Sinewave

We are proud to be an equal opportunities employer, dedicated to creating a diverse and inclusive workplace where everyone feels valued and empowered to contribute. We review all applications impartially, ensuring decisions are based solely on merit, skills, and potential. If you require any adjustments to support you through the application or interview process, please let us know—we’re here to help.

What you'll be doing:

Upon joining, you'll go through our top-notch induction and onboarding process and have opportunities to develop further through our in-house training academy.

Sales ledger duties:

• Creating/Processing Sales invoices for the O&M business, and supporting in raising invoices for projects
• Allocating daily client receipts into the accounting system and project systems within Procore
• Debt collection – communicating with customers on invoices due for payment
• Participating in finance meetings
• Other ad hoc finance and administrative duties as required

Purchase ledger duties:

• Processing Purchase/Supplier invoices
• Creating payment batches and issuing remittance advices
• Accessing supplier online portals for invoice/statement documentation
• Checking and ensuring supplier statements are reconciled to internal systems

Other responsibilities:

• Prepare and distribute financial documentation internally and externally
• Ensure finance procedures are followed, work with colleagues to promote understanding of required processes, and contribute ideas for continuous improvement
• Using accounting systems to maintain accounts and conduct audits to ensure data accuracy
• Conduct financial data entry tasks and maintain organized filing systems
• Process credit/debit card transactions
• Support with invoice processing, expenses, payment batches, company cards, and reconciliation

Requirements

Successful candidates will be:

• Proficient in productivity and collaboration software such as Microsoft Office and Teams across multiple devices
• Excellent communicators with adaptable styles and outstanding listening skills
• Strong interpersonal skills with initiative and teamwork abilities
• Intermediate MS Excel skills
• Highly accurate with excellent attention to detail
• Knowledgeable about business operations
• Desirable: Basic knowledge of Xero Accounting Systems and experience with construction industry software

Experience and Qualifications

• Desire to start or progress an accounting qualification
• GCSE/A-Level Maths or equivalent
• Degree or finance qualification is desirable
• Previous finance support experience is advantageous

Benefits

We offer an exciting work environment with a welcoming, friendly team. As a fast-growing business, we value maintaining our company culture and the feeling of being part of a small business, regardless of our size.

Whether based at our HQ in Swindon, working in the field, or remotely, we have many benefits to offer, including a supportive environment for your growth and development.