Junior Buying Manager (w/m/d)

Catawiki

At Catawiki, every day brings the extraordinary! Whether it’s Daniel Ricciardo’s Formula 1 Car, a Woolly Mammoth’s Skeleton, Lady Gaga's Jumpsuit or Usain Bolt’s running shoe, we encounter exceptional objects every day. We’re a one-of-a-kind marketplace for buying and selling special objects. Each week, more than 100,000 unique items are auctioned, all carefully curated by our passionate in-house experts. Having sold over 25 million unique objects, our mission is to become the world’s most popular destination for special objects. As a growing, diverse and sustainable scale-up, we proudly live by three core values. If these values resonate with you, we’d love to explore how you can join us. * Taking ownership and driving impact  * Being open to change and feedback * Being passionate about our mission and our customers.  YOUR MISSION Catawiki is on a journey to scale its Commercial organisation to support our mission: connecting passionate enthusiasts with exceptional objects. To further unlock this growth, we are expanding the function that empowers our Sellers, Sales and Expert teams with the strategy, tools, and insights they need to thrive. As a Junior Project Manager in Supply Operations, you will help drive the execution of cross-functional initiatives that improve how we attract, engage, and retain high-potential sellers. You will work closely with Sales, Category Management, Product, and other operational stakeholders to coordinate priorities, support rollouts, and turn strategic plans into scalable workflows and day-to-day execution. This role will support a broad range of initiatives across commercial enablement and seller excellence, from product GTMs to operational improvements in our CRM system, and curation tooling. It is a hands-on, collaborative, and analytical role, ideal for someone early in their project management career who enjoys bringing structure to complexity, keeping stakeholders aligned, and making sure execution happens smoothly. WHAT YOU'LL DO We’re the team behind scaling Catawiki’s commercial engine. Sitting at the intersection of our commercial organisation (Sales & Experts) and our Product & Tech organisation, we design and deliver programs that unlock commercial growth, operational efficiency, and customer delight across the supply funnel. Our remit spans: Sales operations & enablement: driving sales excellence by equipping our sales teams and commercial stakeholders with the insights, processes, and tools they need to succeed. Expert operations: enabling our domain experts to scout, assess, and optimise supply through support, tooling, and data, from object intake to auction placement. Seller excellence: defining what “good” looks like for our sellers and shaping behaviour through programs that blend education, accountability, and incentives. We partner with Product, Marketing, Trust & Safety, and Data Science to deliver initiatives such as seller education, loyalty programs, affiliate supply, and product co-design. Our team is made up of project and program managers, led by a Manager reporting into the VP of Commercial Operations. We operate cross-functionally, building bridges between Commercial and Tech to design scalable, high-impact solutions. STRATEGY & INSIGHT-DRIVEN EXECUTION * Use data-driven insights to identify opportunities to improve seller success, expert workflows, and overall commercial impact. * Engage and align key stakeholders across Sales, Category Management, and Product to ensure buy-in and shared accountability for program success. Cross-Functional Program Leadership * Lead pilots that test new processes or tools with selected experts/sellers, and scale successful models across teams and categories. * Align cross-functional stakeholders around shared objectives and clearly defined KPIs. Process Design & Rollout * Translate strategic objectives into concrete workflows, playbooks, and training materials. * Design, validate, and implement new operational processes that improve efficiency and impact, ensuring strong stakeholder buy-in. * Support a culture of continuous improvement by iterating on tooling, workflows, and enablement assets based on feedback and results.   WHAT YOU'LL BRING MUST-HAVE QUALIFICATIONS * 3+ years of work experience in project management, project coordination, operations, consulting, business operations, commercial operations, or a related field. * Proven ability to coordinate cross-functional initiatives and keep multiple stakeholders aligned. * Strong organisational skills, with great attention to detail and a structured way of working. * Comfortable working with data, dashboards, and performance metrics to support project delivery and decision-making. * Clear communicator who can structure information, follow up effectively, and keep work moving in ambiguous environments. * Proactive and hands-on: you take ownership, spot gaps, and drive progress without waiting to be asked. * Able to manage multiple priorities in a fast-paced, changing environment. NICE TO HAVE * Marketplace or e-commerce experience. * Exposure to CRM/workflow tooling. * Experience in a scale-up or high-growth environment. * Familiarity with process improvement, change management, or rollout support. WHY YOU'LL LOVE WORKING WITH US * Create a visible impact by working at scale in a global organisation serving millions of customers across 80+ categories. In our flat structure, every role has a broad scope and directly impacts both our customers and the business. * Learn and grow through our Learning & Development initiatives, including clear development plans and mentorship programmes to support your career progression. * A culture of connection defines us. We’re a passionate, diverse team of 800+ Catawikians representing 60+ nationalities. We foster an inclusive and queer-friendly environment where everyone is encouraged to bring their full self to work. * Celebrate life’s moments with us. You’ll receive a €100 Catavoucher when you join, a €50 Catavoucher on your birthday, and an extra day off each year to “Pursue Your Passion”. We also offer additional leave for key work anniversaries and important life events. Benefits may vary by location. OUR OFFICES AND WAY OF WORKING Our vibrant offices in Amsterdam and Lisbon are designed to inspire collaboration. Most Catawikians operate in a hybrid setup, combining office-based and remote work, with a minimum of two days per week in the office, unless a role is explicitly stated as fully remote or fully office-based. INTERESTED? Apply with an English CV and Cover Letter. By applying, you agree to Catawiki’s Applicant Privacy Policy. If you’re excited about this role but don’t meet every requirement, we still encourage you to apply anyway. You may be just the right candidate for this or other roles.

Tradedoubler

ROLE OVERVIEW App Growth | DSPs | Paid Media | Future Team Ownership Europe: Appiness's main office is in Amsterdam but you can work from any of our offices in Berlin /Munich/London. Hybrid | Senior Level | Full Ownership We are not looking for a campaign operator. We are looking for someone who knows how to scale app growth — and wants to build something meaningful. Appiness is an AI-powered App Growth Partner turning app users into shoppers. We don’t optimize for cheap installs. We optimize for incremental post-install value. Now we are hiring the person who will help build and scale our Media Buying capability together with our Head of Supply.  This role starts deeply hands-on. Shortly, you will evolve into Media Buying Lead and build the team around you. MAIN RESPONSIBILITIES Build and run high-performance media buying across differentiated traffic ecosystems that: * Scale profitable app growth  * Turn new SSP/DSP partnerships into scalable performance  * Protect incrementality and margin  * Create repeatable buying systems  * Build the foundation of a future elite Media Buying team  You will work at the center of: * Supply strategy  * Campaign execution  * Scaling logic  * Performance optimization  This is a hands-on builder role.   What You’ll Actually Do Expand the Supply Universe Own Media Buying & Campaign Management You will work directly inside platforms and manage campaigns across: * AppLovin/ ironSource / Unity/ Liftoff/ Moloco/ InMobi/ Mintegral/ Chartboost/ AdColony/ Fyber/ Additional DSP ecosystems  You understand: * Campaign setup & optimization  * Bidding strategies  * Scaling logic  * Budget allocation  * Creative testing  * Post-install optimization  * Traffic quality analysis  * Margin protection  You know how to scale campaigns without destroying efficiency. You know when scale is real — and when it is fake. Turn New Supply Into Scalable Performance Our Head of Supply will bring new SSPs, DSPs and differentiated traffic opportunities into the company. Your job is to make them work. You will: * Launch and optimize campaigns across new traffic sources  * Structure testing frameworks  * Validate traffic quality  * Identify scalable opportunities  * Build repeatable optimization logic  * Turn testing into scalable growth  You are the bridge between: * Supply strategy  * Media buying execution  * Client performance  Build the Media Buying Team You will start hands-on. You will build and scale a small elite Media Buying team. You will: * Establish buying processes and standards  * Create structured workflows  * Help hire and onboard future buyers  * Transfer knowledge and best practices  * Build repeatable scaling systems  We are not looking for a corporate manager. We are looking for a strong operator who can evolve into leadership. Own MMP & Post-Install Logic You have strong hands-on experience with: * Adjust (preferred)  * AppsFlyer / Singular or similar  You understand: * Postbacks & event mapping  * SKAN complexity  * Event-based optimization  * Cohort & LTV analysis  * Attribution logic  * Fraud signals  * Incrementality testing  If your optimization ends at CPI — this role is not for you. Understand the Ecosystem You know how campaigns operate across: * Meta  * Google App Campaigns  * TikTok  * Apple Search Ads  You understand the role of: * DSPs  * SSPs  * App networks  * Walled gardens  * OEM supply  * Premium inventory  You think cross-channel. How Success Is Measured * Successful scaling of new traffic sources  * Strong post-install performance  * Stable margin while scaling  * Structured testing & optimization discipline  * Strong operational buying quality  * Successful build-out of Media Buying capability over time  We care about scalable quality. Not vanity scale. YOUR PROFILE Who You Are * 5–7+ years in mobile performance marketing  * Strong hands-on media buying experience  * Deep campaign management expertise  * Experience across DSPs and app networks  * Strong analytical mindset  * Structured under pressure  * Commercially aware  * Hungry to build something  You still like being inside platforms. You still enjoy buying traffic. But you also want more ownership. Not For * Junior UA managers  * Dashboard optimizers  * Pure Meta/Google buyers  * Passive campaign operators  * Anyone without deep app ecosystem experience  WHY US? Why This Role Is Big Media Buying is one of the operational cores of Appiness. Your decisions directly impact: Performance quality | Margin | Scalability | Client retention | Growth stability  This is not a traffic buying role. It is the foundation of a scalable app growth engine. If you’re ready to scale campaigns, build systems and grow into leadership — let’s talk.   As part of Tradedoubler Group, Appiness is a truly global force, with offices across 10+ countries. Our team? Diverse, creative, and endlessly collaborative—bringing together brilliant minds from all over the world to shape the future of digital growth.  appiness.net | tradedoubler.com

Jellyfish

Jellyfish is a full service global digital agency, combining strategy, creative, data and media buying and planning expertise with technology under one integrated roof. With almost 2,000 Jellies across 38 offices worldwide, we are the unconventional global marketing partner of the future. We understand both brand and activation. We ensure our clients reach, influence and connect with the right audiences and fans based on data that reveals the insights to deliver exceptional creative solutions across any platform. In short, we create and deliver culturally relevant creativity that cuts through the clutter and sets hearts (and feeds) on fire. As part of the Brandtech Group we’re at the forefront of the deployment of GenAI tools across every aspect of what we do and in PencilPro we have the world’s No 1 generative AI platform, revolutionising the process of creative production, distribution and performance prediction. Team Overview The Talent Acquisition team is the driving force behind Jellyfish’s growth, shaping a world-class workforce that fuels our innovation and success. We are a global team of 12, based across the UK, US, Mexico, South Africa, France, Spain and India. More than just hiring top talent, we build the future of Jellyfish - connecting bold thinkers, game-changers, and visionaries with opportunities to make an impact. Role Overview Reporting to our Talent Acquisition Director, we are looking for a strategic and hands-on Senior Talent Acquisition Manager to lead our recruitment efforts during a 12-month maternity cover. In this pivotal role, you will be responsible for maintaining our hiring momentum across our global markets, ensuring we attract and hire top-tier talent. You will act as a trusted advisor to senior stakeholders, use data-driven insights from our ATS, Ashby, to refine our hiring strategies. This role is ideal for an experienced recruiter who enjoys the blend of high-level strategy, technical sourcing, and mentorship. Responsibilities * Manage the end-to-end recruitment process for a variety of roles across our capabilities, with a specific focus on technical, data, or analytics positions. * Act as a strategic partner to Department Heads and Leadership, providing market mapping, salary benchmarking, and headcount planning. * Utilise recruitment analytics (time-to-hire, source quality, conversion rates) to optimize the hiring funnel and report on progress to the leadership team. * Provide guidance, support, and mentorship to junior members of the TA team, fostering a culture of excellence and continuous improvement. * Enhance our presence in the European media market through targeted networking, events, and digital presence. * Ensure a seamless candidate experience, from initial outreach to successful onboarding. Skills and Competencies * 6+ years in Talent Acquisition, with a proven track record in the Media, Advertising, or Digital Tech industries. * Strong experience hiring for technical domains (i.e. Engineering, Data Science, or Analytics), with the flexibility to stretch and hire for multiple capabilities. * Experience using advanced ATS reporting and analytics, and an interest in using and experimenting with AI tools (e.g., Gemini, Claude). * You have the gravitas to challenge senior leaders when necessary and the empathy to guide them through complex hiring decisions. * You thrive in the fast-moving environment typical of a maternity cover, picking up existing projects quickly while identifying areas for immediate impact.