--- tytul: "Mateusz Haber, author on the JustIdea blog" opis: "Mateusz Haber, CEO / Marketing & E-Commerce Specialist at JustIdea. 4 articles on the blog. Topics: Marketing, Case Studies. See what they write about and bui" adres: https://justidea.agency/en/author/mateusz-haber/ serwis: "JustIdea Agency" jezyk: pl zrodlo: automatyczny odpowiednik strony HTML, generowany przy każdym buildzie --- ![Mateusz Haber](https://justidea.agency/obrazy/mateuszhab-ea59408f.webp) Blog author # Mateusz Haber CEO / Marketing & E-Commerce Specialist Founder and CEO of JustIdea Agency. On the blog and at industry conferences he talks about e-commerce profitability: why ROAS can be a misleading metric and how to measure the real profit from sales rather than revenue alone. 4 articles Management [LinkedIn](https://www.linkedin.com/in/mateusz-haber/) [JustIdea team](https://justidea.agency/en/about-us/) Body of work ## Articles by Mateusz Haber [Marketing 27 November 2025 ROAS Is a Myth: Stop Telling Fairy Tales, Read the Data](https://justidea.agency/en/blog/roas-is-a-myth-focus-on-the-data/)[Marketing 8 July 2025 ROAS Is Dead: How to Measure Real E-commerce Profitability](https://justidea.agency/en/blog/roas-is-dead-real-ecommerce-profit/)[Marketing 18 June 2024 €57,000 a Month Thanks to Marketing Automation \[Case Study\]](https://justidea.agency/en/blog/marketing-automation-250k-monthly-revenue-case-study/)[Case Studies 1 December 2023 How We Scaled an Online Shop to €320k in Monthly Revenue](https://justidea.agency/en/blog/how-to-increase-sales-in-your-online-shop/) There is a company behind this byline ## Mateusz Haber writes about the work they do on client projects The ratings below cover the whole agency, not a single author. Clients gave them on Google, Facebook and Clutch. 4.96 / 5 weighted average of 224 reviews across three platforms [Read the reviews](https://justidea.agency/en/justidea-reviews/) [![Google](https://justidea.agency/assets/logo-google.svg) 4.97 / 5 156 reviews on our Google Business Profile](https://www.google.com/search?q=JustIdea+Agency+Krak%C3%B3w+opinie)[![Facebook](https://justidea.agency/assets/logo-facebook.svg) 5.0 / 5 33 reviews on our Facebook page](https://www.facebook.com/justidea.agency/reviews)[![Clutch](https://justidea.agency/assets/logo-clutch.svg) 4.9 / 5 35 B2B reviews, each verified in a call with the client](https://clutch.co/profile/justidea-agency) Statuses awarded by the platforms: PrestaShop Expert ★★★, Google Premier Partner 2025, Meta Business Partner, Microsoft Advertising Elite Partner 2025. [All certificates and awards](https://justidea.agency/en/our-awards/) What they write about ## Topics [Marketing40](https://justidea.agency/en/category/marketing/)[Case Studies24](https://justidea.agency/en/case-studies/) Contact ## A conversation about your numbers: 30 minutes The call is led by a new business specialist. When we get into the details of an account, the specialist for that channel joins in. We reply within one business day. A quick review of your tracking and campaignsThree priorities for the next quarterA written summary that stays with you Before the meeting we review your website, your visibility and what your campaigns show from the outside. We will not open with “so, what does your company do?”. [4.96 224 reviews](https://justidea.agency/en/justidea-reviews/) What happens after you send it 01 within 1 business day ### We reply to your email The reply comes from the same new business specialist who will run the call. No qualification form and no call from an unknown number. 02 this week ### A 30-minute conversation We go through your numbers and your questions. If it turns out we are not the right fit, we will tell you straight away.