Management Accountant Job at Harmonic Finance™

Job Description

Management Accountant | B2B SaaS Startup | London, Hybrid The Client Harmonic is delighted to be exclusively partnering with a B2B SaaS start-up that has grown their top tier customer base 8x in the last year, with a clear target to double it again by the end of next year. Having closed multiple funding rounds in quick succession, the business is well-capitalised and growing fast, with further investment expected on the horizon. The finance function is intentionally lean: this hire will work directly with the senior finance leader and take on meaningful ownership from day one, with a clear path to accelerating their career in a short period of time. The Role Reporting directly into the VP Finance (who is a strong mentor and committed to investing in this person's development), the Management Accountant will own core accounting and billing operations across a three-entity structure spanning the UK and multiple US states. Day-to-day, this means preparing consolidated management accounts, overseeing outsourced bookkeeping (UK and US), managing complex usage-based billing reconciliation, and owning AP/AR and compliance processes. The business operates in an AI-first way and welcomes new thinking on process and tooling: this is a role for someone who enjoys building and improving, not just maintaining. Longer-term, there is genuine scope to own the entire finance function as the company continues to scale.

Job Responsibility

Prepare and consolidate monthly management accounts across three legal entities (UK and multiple US states)
Perform monthly billing reconciliation across usage-based data, third-party invoices, and internal reporting
Oversee outsourced bookkeeping providers in both the UK and US, with the option to bring processes in-house over time
Own AP/AR processes, including invoicing, monitoring outstanding balances and collections
Manage intercompany transactions across the multi-entity structure
Support quarterly and annual compliance and tax filings across UK and US jurisdictions, including multi-state US filings
Identify process inefficiencies and rebuild workflows, including through AI and tooling where appropriate
Contribute to month-end close, including journal preparation, reconciliations and source data validation

Requirements

Newly qualified accountant (ACA/ACCA/CIMA/AAT) or near-qualified with strong momentum towards completion
0-2 years of post-qualification experience, or equivalent in a comparable role
Background in a B2B SaaS or technology business, or in practice with a strong technology client portfolio
Comfortable operating with autonomy in a small team, with the ability to build processes rather than inherit them
Strong analytical skills with the ability to manage and interpret complex data sets

Nice to have

Exposure to multi-entity or multi-jurisdiction accounting structures, particularly UK and US
Experience with Xero or comparable accounting software
Familiarity with billing systems or usage-based revenue models

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Management Accountant

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