Financial Controller | High Growth Energy Scale-up | London

Harmonic Finance™ | Certified B Corp; England; On-site; GBP 90,000 - 110,000; Full time

Benefits offered by this job

Equity for all employees

Inclusive and equitable workplace

Job summary

A high-growth energy scale-up in London is seeking a Financial Controller to lead financial operations and support fundraising. The successful candidate will work closely with senior leadership, take ownership of core accounting duties, and engage directly with investors. This role requires a strong numerical background, ACA qualification, and experience in asset-based environments. The company offers an inclusive workplace and values diverse applications. Competitive salary up to £100,000 plus equity.

Qualifications

• 2–5 years’ post-qualification experience in industry.
• Experience in a tangible, asset-based environment.

Responsibilities

• Production of monthly management accounts and leading the month-end close.
• Build and maintain financial models and projections.
• Support fundraising activity and prepare financial materials.

Skills

Strong numerical skills

Extremely strong Excel skills

Comfortable in a fast-paced environment

Confident engaging with stakeholders

Education

ACA qualified from a Top 10 accountancy firm

Degree in Physics, Maths, Engineering, Economics or Finance

Job description

Financial Controller | High Growth Energy Scale-up | London

Harmonic Finance™ | Certified B Corp provides a pay range based on your skills and experience. Talk with your recruiter for details.

Financial Controller | High-Growth Infrastructure / Energy Scale-Up | London (Onsite)

The Client

Harmonic is partnering with a high‑growth, venture‑backed infrastructure and energy scale‑up that has scaled from zero to a £60m+ valuation in under five years.

Backed by highly experienced founders and senior operators (including former investment banking and exited‑founder backgrounds), the business works with blue‑chip institutional and corporate clients, delivering large‑scale, tangible projects across the UK.

With a lean team of around 20 people and ambitious growth plans, the company is entering a critical phase focused on fundraising, scaling operations, and positioning for a future sale. Finance sits at the heart of that journey.

The Role

This is a hands‑on Financial Controller role, reporting directly into the Founder/CFO and CEO, working closely with an experienced Finance Director.

This hire is effectively stepping in as the FD’s right hand, taking ownership of core accounting, financial modelling, projections, reporting, and investor relations support. You will be deeply involved in fundraising discussions, board‑level analysis, and supporting strategic decision‑making across the business.

This is a role for someone who is extremely numerate, commercially sharp, and comfortable operating at pace, in a flat, high‑trust environment where everyone is hands‑on.

Key Responsibilities

• Production of accurate monthly management accounts, reporting packs and leading the month‑end close.
• Act as the Financial Director’s core support across all financial planning, analysis, and reporting.
• Build and maintain robust financial models and projections to support growth, financing, and strategic decisions.
• Prepare board‑level reporting and analysis, ensuring numbers are accurate, reconciled, and decision‑ready.
• Support fundraising activity, including preparation for investor meetings and financial materials.
• Work closely with the procurement and delivery teams, ensuring costs, commitments, and forecasts are fully aligned.
• Improve and streamline financial processes, controls, and reporting as complexity increases.
• Act as a trusted partner to senior leadership in a fast‑moving, founder‑led environment.

What We’re Looking For (Essential)

• ACA qualified, trained at a Top 10 accountancy firm.
• Strong numerical academic background (e.g. Physics, Maths, Engineering, Economics, Finance degree).
• 2–5 years’ post‑qualification experience in industry.
• Experience in a tangible, asset‑based environment (e.g. infrastructure, construction, energy, manufacturing, procurement‑led businesses).
• Extremely strong Excel skills.
• Comfortable operating in a lean team, with pace, ambiguity, and ownership.
• Confident engaging with founders, investors, and senior stakeholders.

Salary: Up to £100,000 + equity (everyone receives equity over time)

Location: London, 4–5 days per week in the office

Start Date: Up to 1 month notice.

At Harmonic, we are dedicated to fostering an inclusive and equitable workplace. We actively welcome applications from individuals of all backgrounds and assure you that every candidate will be thoughtfully considered for the roles we represent, without regard to race, religion, gender expression, disability, or sexual orientation.