ISEAL is seeking an experienced charity finance professional to play an important role in ensuring the accuracy and integrity of our financial records and systems.
As part of our small finance team, the Assistant Accountant will help provide a strong financial administration service to the organisation. The postholder will work closely with ISEAL’s membership team, as well as across different areas of ISEAL’s finances. Having recently introduced a new finance system (Sage INTACCT) and generally overhauling our major systems, we see this role as being part of our journey to learn how to further exploit this set-up.
The role has some core responsibilities focused on ISEAL’s sales ledger, timesheets and payroll. The Sales ledger covers both income from our members, and other customers. The postholder will hold responsibility for engaging colleagues across the organisation with the relevant finance processes. All our core-finance roles also cover for each other as needed. This position reports to the Manager, Financial Accounting.
As an ideal candidate, you will bring a good understanding of accounting and finance, ideally having passed some professional exams. You will have experience of finance systems as well as excellent IT and excel skills. You will bring strong technological competencies and an interest to develop financial systems and processes. An ability to manage your own work and comfortably communicating with colleagues and customers alike comes naturally to you.
ISEAL is the global membership organisation for sustainability systems, including many of the world’s most respected schemes. Our members work across diverse sectors and issues – from labour rights and livelihoods to biodiversity conservation and climate resilience. They are international, with global reach, and support businesses and the economy to become more sustainable in every way.
Financial accounting
· Maintain and manage sales ledger
· Ensure that money received is properly captured in ISEAL’s accounting system
· Monitor outstanding balances, and cooperate with Membership Team to ensure proper escalation
· Management and reporting of bad debtors
· Support across the financial operations so that the team can cover all areas, depending on fluctuating need
· Support with monthly and quarterly management accounting processes, such as balance sheet reconciliation, fixed asset accounting and VAT
Timesheets
· Manage timesheet process and support ISEAL staff in understanding its purpose and fulfilling its requirements
· Ensure clear communication of the schedule for timesheet completion, following up where submission is late
· Support Manager, Financial Accounting with reconciliations and accuracy checks
Payroll
· Act as back up for timely processing of payroll payments
· Support with proper accounting and reconciliations for ISEAL’s payroll
Essential experience, knowledge and attributes
· Minimum part qualified accountant or qualified by experience with strong financial management experience
· Strong experience supporting financial day to day operations and financial transaction processes.
· Some experience of management accounting and month/quarter-end processes incl. journal entry, reconciliations and similar
· Exposure to and familiarity with credit control, cash allocation and aged debt management.
· Strong understanding of accounting principles and how these are reflected in accounting software
· Familiar with principles of double entry accounting
· Competent user of excel and accounting software
· Affinity with and interest in developing systems and processes for greater efficiency
· Able to communicate effectively and professionally both internally and externally
· Excellent organisational skills and attention to detail
Desirable
· Progressing towards an accounting qualification and taking initiative for professional development
· Knowledge of Sage Intacct accounting software– would be an advantage
Our values are connection, empowerment, inspiration, wellbeing, effective working, and creativity.
These are traits we value in each other and in the organisation. We instil these values in all our processes and interactions.
We work on global issues and our team reflects this, with individuals from different backgrounds and nationalities. This diversity adds to the quality of work that we deliver and through our commitment to diversity and inclusion we strengthen our team.
Diversity for us includes race and gender identity, age, disability status, sexual orientation, religion and many other areas that form someone´s identity. We are proud to be an equal opportunities employer.
As an organisation, we also support our people in their personal and professional development, with the budget and processes in place for staff to take advantage of development opportunities.
We offer 25 days of annual leave, with an additional day a year added after two years (to a maximum of 30 days). In addition, we add an extra five days as a one off, once you have been with us for five years. Leave will be pro rata for part-time staff.
We have a hybrid-working model with most work done remotely. A minimum of 2-3 days per month in the London office. Staff have the opportunity to apply for flexible working arrangements to suit individual´s needs.
Other relevant information
Term: This is a permanent contract
Salary: £35-40k per annum pro rata, depending on experience
Working hours: 22.5 hours/week, over at least 3 days, based on a timetable to be agreed. All ISEAL’s finance team currently work on Wednesdays.
Location: The role is mostly done remotely, but London is the formal office base and office presence required 3 days per month during probation, 2 days per month thereafter. Applicants will need to provide evidence that they are entitled to work in the UK.
International travel: The post holder may be required to undertake occasional international travel
Annual leave: 25 days pro rata
Ideal Start Date: mid November
How to apply
Please use this link to apply:
Specific enquiries about this role and the application process can be sent to the [email protected].
Deadline for applications is 13 September 2026. Please note that we will only contact shortlisted applicants.
Interview process
Please see below the planned interview process (please note that we will endeavour to keep to this schedule, but some dates may be subject to change)
First interviews (Teams): starting 16 September
Pre-interview timed exercises (between 60 – 90 minutes from home): from 16 September
Panel interviews (in person): 30 September
Decision: 7 October
Accessibility
If candidates require additional time or other considerations for the interview process, we are committed to accommodating any reasonable requests. Please note that ISEAL will cover travel expenses for in person interviews for candidates travelling from outside of Greater London. ISEAL also covers caring expenses for candidates who are carers and need to arrange of cover for the duration of the interview/exercises