Junior Finance Assistant

Sinewave Energy Solutions Ltd; Swindon; On-site; GBP 22,000 - 28,000; Full time

Job summary

A leading energy solutions provider in Swindon seeks a Junior Finance Assistant. This entry-level role is perfect for recent graduates or college leavers. You'll receive hands-on training, work alongside experienced professionals, and contribute to meaningful projects. Ideal candidates will have strong attention to detail and a desire to pursue an accounting qualification. The position offers a supportive and inclusive work environment.

Benefits

Opportunity for career progression

Inclusive workplace culture

Hands-on training and mentorship

Qualifications

• Proficient in use of Productivity and Collaboration Software.
• Strong attention to detail and accuracy in tasks.
• Desire to start or progress an accounting qualification.

Responsibilities

• Creating and processing sales invoices.
• Allocating client receipts into accounting systems.
• Participating in finance meetings and ad hoc duties.

Skills

Proficient in Microsoft Office

Excellent communication skills

Strong interpersonal skills

Intermediate MS Excel skills

Basic awareness of Xero Accounting Systems

Education

GCSE/A-Level Maths or equivalent

Degree/finance qualification

Tools

Xero Accounting Systems

Construction industry software

Job description

Overview

Sinewave, Swindon, England, United Kingdom

Join to apply for the Junior Finance Assistant role at Sinewave. Sinewave was founded in 2015 with a clear mission: everything we do will be a power for good. We have grown from a living room start-up to a leading force within the energy transformation sector. We are the only B-Corp Certified ICP in the world. We power the UK’s energy transition with innovative high and low voltage electrical solutions up to 400kV, including EV charging, renewables, and commercial projects. Join us to drive change and make an impact.

Kickstart Your 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 supports the Finance Team with Sales Ledger transactions (sales, receipts and payments allocations) and Purchase Ledger transactions (invoice processing).

Everyone belongs here at Sinewave. We are an equal opportunities employer, dedicated to a diverse and inclusive workplace. If you require any adjustments to support you through the application or interview process, please let us know—we’re here to help. #teamsinewave

What you’ll be doing

On joining, you’ll go through our induction and onboarding process and have opportunities to develop through our in-house training academy. Responsibilities include:

• 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 (Procore)
• Debt collection – communicating with customers on invoices due for payment
• Participating in finance meetings
• Other ad hoc finance and administrative duties as required
• Processing purchase/supplier invoices
• Creating payment batches and issuing remittance advices
• Accessing supplier online portals for invoice/statement documentation
• Checking and reconciling supplier statements to internal systems

Requirements

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

• Proficient in productivity and collaboration software (e.g., Microsoft Office, Teams) across multiple devices
• Excellent communication with the ability to follow verbal and written instructions
• Strong interpersonal skills, initiative, and ability to work collaboratively with prioritisation
• Intermediate Microsoft Excel skills
• High level of accuracy and attention to detail
• Good business awareness
• Basic knowledge of Xero accounting systems (desirable)
• Experience with construction industry software is an advantage
• Compliant with company policies and ethics, including anti-bribery and environmental/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

In return for your contribution, you’ll join a fast-growing, dynamic business that values its small-company culture. We accommodate staff based at the Swindon HQ, field-based roles, or remote work where applicable. We offer an engaging environment with opportunities for growth.

Seniorities: Entry level; Employment type: Full-time; Job function/Industry: Finance roles (Oil and Gas context referenced in listings).