At Fourthline, our mission is to fight financial crime. We help protect the integral financial system by verifying millions of identities for banks, neobanks, online brokers, crypto exchanges, and insurers like N26, Trade Republic, flatexDEGIRO, Nationale Nederlanden, Qonto, Shine, Solarisbank, and more.
Having started our journey in January 2018, we're incredibly proud to count around 250 employees between our Amsterdam and Barcelona offices with over 50 nationalities.
About the role

As a Senior Customer Success Manager at Fourthline, you'll own the relationships with our most strategic and enterprise customers. That means driving retention, accelerating product adoption, and spotting — and closing — upsell and cross-sell opportunities. You'll be the authentic voice of the customer inside Fourthline, translating their needs into better experiences and smarter decisions.
Day to day, you'll work closely with our wider Commercial team, Solutions Engineering, Customer Operations, Delivery Managers, Product Managers, Legal, Compliance,



and other key stakeholders — making sure collaboration across these teams is smooth and effective.
Our Customer Success Managers put customers first, stay ahead of opportunities, and navigate complex cross‑functional projects with confidence. And yes — they still make time for a (virtual) cold drink with the team on Friday afternoons. If that sounds like you, you'll fit right in.
Responsibilities

Drive successful adoption, retention, expansion, and advocacy across your customer portfolio.
Act as a trusted advisor, working with internal teams to maximise the value customers get from Fourthline.
Turn your accounts into active advocates — building case studies, references, and referrals.
Serve as the primary point of contact for escalated issues and resolve customer needs proactively.
Continuously assess account health, growth opportunities, and upsell potential — then build and execute account plans to act on them.
Lead Quarterly Business R

📌 Senior Customer Success Manager (Barcelona)
🏢 Fourthline
📍 Barcelona