Junior Accountant jobs in United Kingdom

One Day Agency is an integrated advertising and marketing agency with offices in Manchester, London, and Warsaw. In just five years, we’ve built a team of 14 dynamic professionals working with brands of all sizes across the Globe, from small e-commerce businesses to F1 teams.

We specialise in delivering high-impact advertising campaigns across OOH, TV, Radio, and digital channels, helping brands grow through strategic media planning and buying.

We’re looking for a Junior Account Manager with at least 1 year of advertising/marketing equivalent role, ideally from an agency, specialist or media owner, to join our fast-paced Growth Team. You’ll take full ownership of inbound client inquiries—converting leads, pitching media plans, and delivering advertising campaigns across multiple channels.

This role is perfect for someone who thrives in a collaborative, high-energy environment, is eager to learn about all forms of media, and can independently manage campaigns from start to finish.

• Manage and convert inbound sales opportunities.
• Plan and buy media across OOH, TV, Radio, and other channels. UK and Worldwide.
• Develop and maintain strong client relationships.
• Oversee campaign execution and ensure seamless project management.
• Collaborate with internal teams to deliver high-quality results.

• Bilingual: French and German speaker.
• Proven experience in account management or media sales (specialist, agency or media owner).
• Excellent organisation and multitasking skills with attention to detail.
• Strong computer skills—you’ll need to navigate multiple platforms with ease.
• Exceptional communication and interpersonal skills.
• Ability to work independently, manage priorities, and meet deadlines.
• Familiarity with project management tools is desirable.
• Proactive, solution-oriented mindset.

• Salary: £35,000 to £45,000 base + uncapped commissions (+£50,000 potential, avg. £15,000 first year)
• Flexible Work: WFH every Friday + 20 additional WFH days per year
• Annual Leave: Up to 30 days
• Professional Growth: Unlimited training and development budget
• Top-tier office setup with high-end equipment
• Additional perks listed on our Careers Page