Summary
Overview
Work history
Education
Skills
Timeline
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Jozi (Jozef) Lenart

London,England

Summary

Data-driven and strategic Account Manager with over 5 years of experience in digital media, advertising, and client relationship management. Proven ability to optimize cross-channel campaigns, analyse consumer insights, and drive business growth. Adept at managing large-scale accounts, leading cross-functional teams, and leveraging data-driven recommendations to improve performance. Fluent in English, Slovak and Czech, with a deep understanding of the digital advertising landscape.

Overview

8
8
years of professional experience

Work history

Performance Planning Manger

Starcom
London
04.2024 - Current
  • Led mid/lower-funnel, cross-channel planning, activation, and digital strategy for Samsung’s Paid Social, Paid Search, and Programmatic activity in the UK market, with global activations.
  • Managed digital performance strategy across Domestic Appliance, TVs, Tablets, and Computing categories.
  • Briefed and collaborated with Channel Specialist Teams to activate campaigns and optimize in-flight performance by effectively questioning the audiences used for the activity and results yielded by the campaigns.
  • Developed best-in-class media plans, responses to briefs, and PCAs across multiple projects.
  • Lead 20+ data-driven tests across multiple campaigns and use insights to build future campaign and audience strategies.
  • Delivered overall ROAS of £14.8 across TV and DA categories in Q1 2025 and £6.45 in Q2-Q4 2024.
  • Utilized CM360, DV360, and Looker for performance reporting and digital audience strategy.
  • Managed relations with client stakeholders with excellent analytical and problem-solving skills.

Publishing & Audio Senior Executive

Starcom
London
01.2021 - Current
  • Progressed internally from Investment Executive.
  • Managed display, print, and audio campaign planning, activation, and performance reviews for Samsung UK and Global.
  • Planned and optimized 200+ campaigns, including 6 flagship phone launches.
  • Analyzed campaign performance using key KPIs (e.g., CPQSV, Viewability Rate, ROAS) to drive improvements.
  • Led 80+ tests on creatives, strategies, and media vendors to refine best-practice planning and buying.
  • Supervised and mentored a team of three Account Executives, fostering a collaborative team environment.
  • Built and maintained strong relationships with clients and senior planning leads as the primary P&A contact.

Marketing & Social Media Coordinator (Part-Time)

Allurion
London
06.2018 - 01.2019
  • Monitored site traffic using Google Analytics to develop fortnightly reports.
  • Identified key demographics and patient interests to refine digital campaign strategies.
  • Assisted lead generation by researching and identifying potential clients in thehealthcare sector.

PR & Social Media Intern (Part-Time)

FARBLACK
London
09.2017 - 05.2018
  • Managed social media presence for fashion and lifestyle brands under the FARBLACK portfolio.
  • Maintained relationships with journalists and media professionals to boost PR efforts.

Education

Bachelor of Arts - Public Relations and Advertising

University of Westminster
London
/2016 - /2019

Grammar School of Leonard Stöckel
Bardejov, Slovakia
06.2016

Skills

  • Paid Search, Paid Social, Print, Radio, Programmatic Display, Digital Audio
  • Campaign planning, budgeting, financing, reporting and performance evaluation
  • Data collection, formatting and analysis
  • MS Office
  • Training and Development
  • Looker, CM360, DV360, Amazon DSP
  • Media Relations and Media Strategy
  • Negotiation
  • Trend forecasting
  • CRM audience management

Timeline

Performance Planning Manger

Starcom
04.2024 - Current

Publishing & Audio Senior Executive

Starcom
01.2021 - Current

Marketing & Social Media Coordinator (Part-Time)

Allurion
06.2018 - 01.2019

PR & Social Media Intern (Part-Time)

FARBLACK
09.2017 - 05.2018

Bachelor of Arts - Public Relations and Advertising

University of Westminster
/2016 - /2019

Grammar School of Leonard Stöckel

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Jozi (Jozef) Lenart