Junior Finance Assistant

Swindon, England, United Kingdom

8/10/2025

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 gone from a living room start-up to a leading force within the energy transformation sector. Not bad, eh!

We are on a mission to help power the future more sustainably. But don't just take our word for it, we are the only B-Corp Certified ICP in the world.

We’re part of powering the UK’s energy transition with innovative high and low voltage electrical solutions up to 400kV. From EV charging to renewables and commercial projects, we design, deliver, and maintain networks with sustainability and efficiency at heart. 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 will support the Finance Team with Sales Ledger transactions, including sales, receipts and payments allocations, and to support in dealing with Purchase Ledger transactions including Invoice Processing.

Everyone belongs here at Sinewave

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 know what it takes to change the world and that’s why 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. #teamsinewave

An idea of what you'll be doing:

When you join you will 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 support in raising invoices for projects

· Allocating daily client receipts into 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:

· 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 accuracy of data

· Conduct financial data entry tasks and maintain organised filing systems

· Process credit / debit card transactions

· Support with invoice processing, expenses, payment batches, company cards and reconciliation.

Requirements

You’ll be a successful Junior Finance Assistant at Sinewave if you’re …

· Proficient in the use of Productivity and Collaboration Software such as Microsoft Office, Microsoft Teams, etc. across multiple platforms such as smart phones, tablets, laptops etc.

· Excellent communication, including ability to adapt styles and outstanding listening skills with ability to follow verbal and written instructions.

· Strong interpersonal skills with demonstrated ability to use own initiative as well as work collaboratively as part of a team, with ability to juggle priorities.

· Intermediate MS Excel skills

· High level of accuracy with excellent attention to detail

· Good knowledge of business awareness

· Basic awareness of Xero Accounting Systems desirable

· Experience of a construction industry software an advantage

· Comply with all company policies, procedures, and business ethics codes, including the anti-bribery policy, while adhering to the Environmental and Quality Management

Experience and Qualifications

· Desire to start or progress an accounting qualification.

· GCSE/A-Level Maths (or equivalent).

· Degree/finance qualification desirable.

· Previous finance support experience desirable.

Benefits

So, let’s talk about what’s in it for you.

In return for everything you can bring, we can offer you an exciting place to work with a welcoming and friendly workforce. We are a fast-growing, dynamic business and even as our team grows in number, maintaining our company culture is important to us. We want to keep the feeling of being part of a small business alive, no matter how big we get.

Whether you’re based in the HQ in Swindon, field-based, or working from home we have a lot to offer:

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