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- Innovating the Future of PaymentsAt COLIBRIX ONE
*, we're building advanced, AI-powered payment technologies that support Payment Service Providers (PSPs), Electronic Money Institutions (EMIs), and neobanks across the EU and the UK.
As a fully licensed Electronic Money Institution (FCA Reference No.
) and holder of a Financial Institution Licence issued by the MFSA, as well as a principal member of both VISA and Mastercard, we provide comprehensive, real-world financial solutions that include:General card processingDigital wallet infrastructureCross-border merchant accountsAlternative payment methods (APMs)Corporate accounts for legal entitiesWe're a fast-growing team with a passion for innovation, security, and scalability.
Our culture values curiosity, collaboration, and impact
- and we're looking for talented professionals who are ready to shape the future of fintech.
At COLIBRIX ONE, your work directly powers the digital economy.
If you're eager to solve meaningful challenges and build with purpose, we'd love to hear from you.About the RoleAs a Senior Account Manager at Colibrix One, you'll take full ownership of our most complex and strategically important merchant relationships.
Beyond managing a larger portfolio, you'll act as a go‑to expert within the Account Management team: mentoring colleagues, sharing best practices, and helping raise the standard of client service across the team.
This is a senior individual contributor role,



ideal for an experienced fintech professional who wants to deepen their impact without moving into formal people management.Key Responsibilities:Own a portfolio of high-value, high-volume, and complex merchants, acting as their trusted advisor and single point of contact across finance, compliance, and operationsLead onboarding of complex or higher-risk merchants, including in-depth document review and close collaboration with Compliance on enhanced due diligenceHandle escalations and sensitive client situations, driving them to resolution and protecting long-term relationshipsIdentify growth opportunities within your portfolio (upsell, cross-sell, volume expansion) and contribute to client retention and revenue targetsMonitor portfolio performance and client health, proactively flagging risks and proposing action plansMentor and coach Account Managers: support them with difficult cases, share knowledge, and help new team members ramp upContribute to training materials, internal playbooks, and onboarding guides for the teamAct as the voice of the client internally, feeding insights to Product, Compliance,



and Operations to shape improvements and new solutionsChallenge existing processes and lead initiatives that improve efficiency and client experienceEnsure the client database and account records for your portfolio are accurate and up to dateYour Profile:Strong client-first mindset with a track record of building long-term B2B relationshipsConfident communicator, able to negotiate, influence, and hold difficult conversations with senior client stakeholdersNatural mentor who enjoys helping others grow and sharing expertiseStrategic and analytical thinker, comfortable working with data to assess portfolio performanceHigh levelof autonomy: able to manage a complex workload and make sound decisions independentlyProactive and solution-oriented, xhfqzwm with the confidence to challenge established normsWhat you need to succeed in this role:2+ years' experience in account management or a similar client-facing role within a regulated entity (payments, banking, or fintech)Proven experience managing key or strategic accounts, including complex merchant onboardingSolid understanding of payments products, merchant risk, and compliance requirements (KYC/KYB, AML)Experience mentoring or informally coaching colleagues is a strong advantageHigher education in Business Management, Economics, or a related field is an advantageExcellent written communication skills and the ability to explain complex topics clearlyFluency in English and Russian (additional languages are an asset)What We Offer:Opportunity to shape the future of fintech solutions within a growing companyA collaborative and supportive team environmentEnglish / Spanish classesOpportunity to receive reimbursement for work-related training/courses
* This position is offered within the COLIBRIX ONE.
Employment will be under the appropriate legal entity based on the role and location.
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📌 Senior Key Account Manager (Barcelona)
🏢 Colibrix One
📍 Barcelona