Junior Media Planner in Cardiff

R4 is a media trading, planning and activation business built around how media actually works in the real world.

The Junior Media Planner role exists to support the delivery of accurate, audience-led media plans while developing the skills required to operate as a fully-fledged planner within a performance-led agency.

Working closely with Media Planners, Media Traders and the Activation team, you will support the creation of media plans, manage data inputs, liaise with media owners and ensure planning outputs are accurate, timely and commercially sound.

This is a development role with clear expectations, structured learning and defined progression.

Requirements

This role is suited to candidates early in their media planning career who are detail-oriented and eager to learn.

You will need:

• 1–2 years’ experience in a media agency, in-house media team or relevant placement
• Basic understanding of media planning principles
• Interest in audience-led planning and real-world media behaviour
• Strong organisational skills and attention to detail
• Confidence working with numbers, spreadsheets and schedules
• Ability to work to deadlines and follow defined processes
• Clear communication skills and willingness to ask questions
• Comfortable working within systems and workflows
• You must be reliable, organised and open to feedback.

What You Get

This is a proper entry point into media planning, built around learning the craft the right way.

• A clear development role within a performance-led planning team
• Hands-on exposure to real media plans, live briefs and active campaigns
• The opportunity to work closely with Media Planners, Media Traders and Activation teams
• Structured learning across audience-led planning, data inputs and commercial accuracy
• Experience using industry planning tools and datasets
• Clear expectations, defined processes and support from senior planners
• A visible progression path into Media Planner and beyond, based on capability and consistency
• Exposure to how media trading, planning and activation connect in the real world
• Optional / Progression-Led Upside
• Earned through accuracy, reliability and growth.
• Fast-tracked progression for high performers
• Expanded planning responsibility across larger briefs and accounts
• Exposure to national and international campaigns
• Long-term career development within a trade-led agency
• 25 days annual leave, plus UK bank holidays
• Your birthday off
• Private healthcare, available after successful completion of probation
• Company pension scheme, with employer contribution
• Company laptop and full working setup provided
• Modern office environment at Battersea Power Station
• Training and professional development support, aligned to progression
• Regular team and company events
• Wellbeing support, including mental health awareness initiatives
• Flexible working where appropriate, once core responsibilities are embedded