Growth Marketer, Collie (B2B SaaS) | Part-time

About Collectmaxx Collectmaxx is a B2B SaaS platform helping companies across Europe automate and optimize their invoice collection and accounts receivable processes. Last year we collected over €65 million for our clients. We are now taking Collie, our new self-service SaaS product, to market and need a hands-on B2B SaaS marketer to build traction for it. We are a small, ambitious team: short lines, real ownership, no layers. We start with Benelux and DACH. Our new SaaS solution: Collectmaxx Collie Collectmaxx Collie is a Software-as-a-Service platform built for companies that invoice consumers directly: utilities, insurers, subscription businesses, and service providers. It automates the full invoice reminder and early collection workflow, combining multiple outreach channels with intelligent AI-driven communication flows, before overdue invoices become a collection problem. Key capabilities: • Multi-channel outreach: email, SMS, AI Voice calls, and video reminders, fully automated • AI-generated communication flows: smart sequences that adapt tone, timing, and channel based on consumer behavior • Installment plans: built-in, configurable payment arrangements to recover more without escalating to collections • EU-wide payment links: Paylink support covering local payment methods across EU markets • White-label ready: businesses deploy under their own brand, preserving customer relationships • Self-service portal & dashboard: consumers manage their own invoices; clients get full visibility on performance Collie is priced as a subscription with no large upfront commitments, purpose-built for SMEs and mid-market companies ready to move to a SaaS model. What you’ll be doing Build traction for Collie: decide the channel mix, build the funnel, grow signups, activation and paying customers in the Benelux market Create the content that drives it: landing pages, comparison pages, customer stories, email sequences and founder-led LinkedIn copy, in Dutch and English. You write it and you publish it Build conversion assets: the cost-of-chasing calculator, the instant personalized demo and the pricing page, with design and dev support Run paid acquisition on a small budget (Google Ads, LinkedIn) with a tight feedback loop, measured on cost per qualified conversation Partnership marketing: co-market with the ecosystems our customers already use, starting with Mollie and accountancy firms, and extending to bookkeeping and ERP integrations as we add them Keep the Webflow site current and converting yourself: pages, metadata, structured data, internal linking. No dev handover Direct our external SEO/GEO agency and implement their recommendations in Webflow What we’re looking for Several years of hands-on B2B SaaS or fintech marketing, with real Benelux experience Proven demand generation: you have built an inbound funnel from scratch, not just run campaigns inside someone else's AI first mindset: you use AI daily for research, drafting, analysis and content production, and you know where it gets things wrong Business-fluent Dutch and English, to a standard where your copy goes live without a rewrite. German is a plus Confident working directly in Webflow: you implement changes yourself Working knowledge of SEO and GEO, enough to brief and direct an agency Self-starter, comfortable as the only marketer in the room Start date: as soon as possible Commitment: 1–3 days per week, flexible based on deliverables Location: Rotterdam, hybrid To apply Send your CV plus two or three examples of work where you can show the number: pipeline, signups, conversion rate, cost per qualified lead, whatever you moved. Tell us what you did, what happened, and what you would do differently. If you have anything on how you use AI in your day-to-day work, we would like to see that most of all.