Head of Supply – Build the Future of App Growth

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

Trainline

About us We are champions of rail, inspired to build a greener, more sustainable future of travel. Trainline enables millions of travellers to find and book the best value tickets across carriers, fares, and journey options through our highly rated mobile app, website, and B2B partner channels.  Great journeys start with Trainline 🚄  Now Europe’s number 1 downloaded rail app, with over 135 million monthly visits and £6.3 billion in annual ticket sales, we collaborate with 270+ rail and coach companies in over 40 countries. We want to create a world where travel is as simple, seamless, eco-friendly and affordable as it should be.  Today, we're a FTSE 250 company driven by our incredible team of over 1,000 Trainliners from 50+ nationalities, based across London, Paris, Barcelona, Milan, Edinburgh and Madrid. With our focus on growth in the UK and Europe, now is the perfect time to join us on this high-speed journey.  Introducing Machine Learning and AI at Trainline 👋 Machine learning and AI are central to how Trainline helps millions of customers make smarter, more sustainable travel choices every day. Our ML models and AI systems power critical parts of the platform - from search and recommendations to pricing intelligence, personalisation, digital marketing, and AI-driven customer support. Our ML teams own the full delivery lifecycle, from ideation through to production. We work closely with stakeholders across the business to expand the reach and impact of ML and AI throughout Trainline. The Role This is a senior leadership role sitting within one of Trainline’s most important product areas: Core Experience. This pillar encompasses the products and systems closest to the customer journey - search, pricing, payments, fare intelligence, and conversational interfaces. You will define and lead the ML strategy, team, and delivery across this domain. That means building and scaling ML and AI capabilities that measurably improve the customer experience and drive business outcomes. The work spans traditional ML systems and emerging agentic/LLM-based capabilities. You will lead multiple ML teams through their respective team leads, reporting to the Director of AI & ML. You’ll be accountable for the people (2 ML Managers and ~10 ICs), delivery, and budget across your pillar - including vendor and infrastructure cost management. You’ll work closely with Product, Engineering, Data, Analytics, and commercial stakeholders, combining strategic thinking, technical leadership, and organisational leadership to ensure Trainline continues to ship high-quality, scalable ML systems in production. As a Head of Machine Learning - Core Experience at Trainline you will... 🚄 * Set direction and own the budget. Define the vision, strategy, and roadmap for ML across the Core Experience pillar. Own the pillar’s budget - including cloud infrastructure, vendor costs, and third-party tooling - balancing short-term delivery with longer-term platform investments. * Lead and grow the organisation. Lead multiple teams through their team leads. Coach managers and senior ICs, set hiring strategy, and build a culture of technical excellence, experimentation, and delivery. Partner closely with Product, Engineering, and commercial stakeholders to identify high-value opportunities and raise adoption of ML across the business. * Deliver and operate. Drive delivery across search relevance, payments models, splits and fare optimisation, supply automation, and conversational AI. Ensure your teams ship end-to-end - from prototyping through deployment, monitoring, and iteration. Raise operational maturity by defining SLIs/SLOs, incident management, and on-call practices for ML systems in production. * Shape AI practices and governance. Co-own the operating model for modern AI at Trainline - LLM-based features, agentic systems, evaluation frameworks, and guardrails. Drive improvements in AI governance, data privacy, security, and audit accountability as capabilities scale. We'd love to hear from you if you have...🔍 * Significant experience building and leading production ML teams, including managing through team leads (manager-of-managers) * Strong track record of shipping ML systems that deliver measurable business or customer impact, across problem types such as ranking, recommendation, forecasting, optimisation, or real-time decisioning * Deep understanding of the full ML lifecycle and strong software/platform instincts - you know what it takes to run reliable ML at scale – including MLOps tooling and practices * Experience raising operational standards: SLIs/SLOs, monitoring, incident management, and production reliability * Budget ownership, including infrastructure cost management and vendor oversight * Comfortable operating at both strategic and technical levels, with strong stakeholder and communication skills * Experience hiring, mentoring, and developing technical talent at multiple levels Nice to have 😍 * Experience with AWS cloud infrastructure * Experience with cross-functional delivery in product-led organisations * Experience deploying conversational and agent-based systems in customer-facing products * Experience in travel, transport, marketplaces, or similarly complex digital platforms Our technology stack 💻 * Python and associated ML / DS libraries (scikit-learn, NumPy, LightGBM, Pandas, LangChain/LangGraph, TensorFlow, etc.) * PySpark * AWS cloud infrastructure: EMR, ECS, Athena, etc * MLOps / DevOps: Terraform, Docker, Airflow, MLFlow * Monitoring and evaluation platforms including New Relic and Braintrust More information: Enjoy fantastic perks like private healthcare & dental insurance, a generous work from abroad policy, 2-for-1 share purchase plans, an EV Scheme to further reduce carbon emissions, extra festive time off, and excellent family-friendly benefits.  We prioritise career growth with clear career paths, transparent pay bands, personal learning budgets, and regular learning days. Jump on board and supercharge your career from day one!  We're operating a hybrid model and ask that Trainliners work from the office a minimum of 60% of their time over a 12-week period. We also have a 28-day Work from Abroad policy. Our values represent the things that matter most to us and what we live and breathe everyday, in everything we do:  * 💭 Think Big - We're building the future of rail  * ✔️ Own It - We focus on every customer, partner and journey  * 🤝  Travel Together - We're one team  * ♻️ Do Good - We make a positive impact  We know that having a diverse team makes us better and helps us succeed. And we mean all forms of diversity - gender, ethnicity, sexuality, disability, nationality and diversity of thought. That's why we're committed to creating inclusive places to work, where everyone belongs and differences are valued and celebrated. Interested in finding out more about what it's like to work at Trainline? Why not check us out on LinkedIn, Instagram and Glassdoor!

Audiomob

AUDIOMOB WAS FOUNDED ON THE CORE PRINCIPLE THAT THERE IS A BETTER WAY TO MONETISE APPS. Audiomob is the industry leader in mobile in-app audio advertising. We push the boundaries of technology to create non-intrusive and highly scalable advertising solutions. At Audiomob, we believe in combining the power of audio, technology, and AI to create seamless and engaging ad experiences for users and effective monetization strategies for game developers and app publishers. We thrive on creativity, collaboration, and a commitment to excellence in everything we do. ROLE OVERVIEW We’re looking for a Marketing Executive to join our UAE team, combining strategic marketing management with hands-on event leadership. The role is divided into two main areas: 1. Event Management: Overseeing all external and internal Audiomob events (conferences, sponsorships, activation). 2. Marketing & PR Leadership: Owning the brand’s marketing strategy across social media, content, public relations, and campaign execution in MENA and global markets. This is a highly visible role that requires both creative vision and operational excellence. You’ll work cross-functionally with Sales, Product, and Leadership to strengthen Audiomob’s presence, manage campaigns and amplify our voice in the industry. KEY RESPONSIBILITIES EVENTS & ACTIVATIONS * Own and manage Audiomob’s global events calendar, ensuring all key industry and internal events are well-planned and executed. * Lead end-to-end event logistics: planning, budgeting, travel arrangements and on-site coordination. * Partner with Sales, Supply and Leadership teams to identify high-impact events for participation or sponsorship. * Measure event ROI and lead post-event debriefs to identify improvements. * Coordinate with industry bodies and partners on event collaborations. MARKETING & PR STRATEGY * Develop and execute comprehensive marketing plans aligned with company objectives and growth targets. * Manage brand positioning and messaging consistency across all channels. * Create and oversee campaign calendars for MENA and global markets. * Collaborate with internal teams and agencies to deliver digital, social and PR campaigns that drive engagement and awareness. * Analyse campaign performance metrics and report on KPIs such as reach, engagement and conversion. * Manage marketing budgets, ensuring efficient resource allocation and cost tracking. SOCIAL MEDIA & CONTENT MANAGEMENT * Oversee Audiomob’s social media presence (LinkedIn, Instagram, TikTok), ensuring consistent tone and design. * Work closely with the head of design to produce compelling, localized content for campaigns, events, and announcements. * Plan and execute organic and paid social campaigns, tracking performance and engagement. * Manage influencer or partner collaborations in gaming, adtech, or media sectors. PUBLIC RELATIONS & COMMUNICATIONS * Build and maintain relationships with press, industry partners and PR agencies. * Draft and distribute press releases, thought leadership pieces and interviews. * Coordinate Audiomob’s presence in awards, media features and speaking opportunities. * Ensure consistent brand representation in all public communications. IDEAL EXPERIENCE * 1-3 years of experience in marketing, communications, or event management, preferably within adtech, gaming, or tech industries. * Proven ability to manage campaigns across multiple channels. * Strong background in B2B marketing and event execution. * Hands-on experience with social media management tools (e.g., LinkedIn Sales Navigator, Dripify, HubSpot, Hootsuite). * Excellent copywriting and communication skills. * Highly organised, proactive, and comfortable managing multiple priorities in a fast-paced environment. We’re building a diverse, inclusive team: Diversity and representation matters to us all. While the forward journey of representation in the game and tech sectors is improving, we recognise that there is still work to be done. We know that the future we want to see should be reflected in our own team and values. As such, we encourage applicants from all backgrounds to apply, and welcome those that believe diversity in all its forms is a key driver of success.