Senior Key Account Manager

Colibrix One; Warszawa; On-site; PLN 150,000 - 230,000; Full time

Benefits offered by this job

Training reimbursement

English/Spanish classes

Job summary

Colibrix One in Warsaw is seeking a Senior Account Manager to own our most complex merchant relationships in a fast-growing fintech environment. You will mentor colleagues, lead onboarding of high-value merchants, and collaborate with Compliance, Finance, and Operations to ensure first-class client service and growth.

You will manage risk, identify upsell opportunities, and shape product improvements by feeding insights from the client base.

Qualifications

• 2+ years in account management or similar client-facing role within regulated payments/fintech
• Proven experience managing key or strategic accounts, including onboarding of complex merchants
• Solid understanding of payments products, merchant risk, and regulatory/compliance requirements (KYC/KYB, AML)
• Experience mentoring or coaching colleagues is a plus
• Higher education in Business Management, Economics, or related field is advantageous
• Excellent written communication skills; ability to explain complex topics clearly
• Fluency in English and Russian; additional languages are a plus

Responsibilities

• Own a portfolio of high-value, complex merchants and act as their trusted advisor across finance, compliance, and operations
• Lead onboarding of complex or higher-risk merchants with due diligence collaboration with Compliance
• Handle escalations and sensitive client situations to protect long-term relationships
• Identify growth opportunities within your portfolio (upsell, cross-sell, volume expansion) and contribute to revenue targets
• Monitor portfolio performance and client health; flag risks and propose action plans
• Mentor and coach Account Managers; support them with difficult cases and ramp-up new hires
• Contribute to training materials, playbooks, and onboarding guides for the team
• Voice the client internally; feed insights to Product, Compliance, and Operations to drive improvements
• Challenge processes and lead efficiency initiatives to improve client experience
• Maintain accurate client databases and account records for your portfolio

Skills

Client relationships

Negotiation

Mentoring

Strategic thinking

Data analysis

Autonomy

Communication

English

Russian

Education

Bachelor's in Business/Economics/Finance

Job description

Join COLIBRIX ONE - Innovating the Future of Payments

At 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. 927920) 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: Global card processing Digital wallet infrastructure Cross-border merchant accounts Alternative payment methods (APMs) Corporate accounts for legal entities

We'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 Role

As 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 operations
• Lead onboarding of complex or higher-risk merchants, including in-depth document review and close collaboration with Compliance on enhanced due diligence
• Handle escalations and sensitive client situations, driving them to resolution and protecting long-term relationships
• Identify growth opportunities within your portfolio (upsell, cross-sell, volume expansion) and contribute to client retention and revenue targets
• Monitor portfolio performance and client health, proactively flagging risks and proposing action plans
• Mentor and coach Account Managers: support them with difficult cases, share knowledge, and help new team members ramp up
• Contribute to training materials, internal playbooks, and onboarding guides for the team
• Act as the voice of the client internally, feeding insights to Product, Compliance, and Operations to shape improvements and new solutions
• Challenge existing processes and lead initiatives that improve efficiency and client experience
• Ensure the client database and account records for your portfolio are accurate and up to date

Your Profile

• Strong client-first mindset with a track record of building long-term B2B relationships
• Confident communicator, able to negotiate, influence, and hold difficult conversations with senior client stakeholders
• Natural mentor who enjoys helping others grow and sharing expertise
• Strategic and analytical thinker, comfortable working with data to assess portfolio performance
• High level of autonomy: able to manage a complex workload and make sound decisions independently
• Proactive and solution-oriented, with the confidence to challenge established norms

What 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 onboarding
• Solid understanding of payments products, merchant risk, and compliance requirements (KYC/KYB, AML)
• Experience mentoring or informally coaching colleagues is a strong advantage
• Higher education in Business Management, Economics, or a related field is an advantage
• Excellent written communication skills and the ability to explain complex topics clearly
• Fluency in English and Russian (additional languages are an asset)

What We Offer

• Opportunity to shape the future of fintech solutions within a growing company
• A collaborative and supportive team environment
• English / Spanish classes
• Opportunity 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.