Post-Sales Implementation Lead — Poland & CEE

Mollie; United States; Remote; USD 90,000 - 130,000; Full time

Job summary

Mollie in the United States seeks an experienced Implementation Manager to lead the post-sales integration for our largest deals. You will guide the project from contract signature through testing, go-live, and handover, acting as the central contact for merchants and internal Mollie teams.

You will coordinate with sales, onboarding, product, engineering and compliance to resolve issues, manage timelines, and keep stakeholders informed with regular updates.

Qualifications

• Minimum 3 years in implementation, project management, onboarding, delivery, or customer-facing roles.
• Excellent communication in Polish and English.
• Experience with payments, fintech or e-commerce is a plus.
• Proven track record managing complex implementations from contract to go-live and handover.
• Solid understanding of APIs, integrations and technical documentation.

Responsibilities

• Own the post-sales integration phase for Mollie's largest and most complex deals, from handover to go live.
• Run kickoffs with internal and external stakeholders, set go-live dates and monitor progress.
• Organise and track testing, raise issues and feedback as they surface.
• Coordinate across sales, product and engineering with merchants to keep everyone aligned.
• Keep go-live dates on track and ensure timely delivery for revenue.
• Maintain documentation and playbooks to make delivery predictable and scalable.

Skills

Polish language

English language

Communication

Implementation

Project coordination

Tools

APIs & integrations

Technical documentation

Job description

Mollie in the United States seeks an experienced Implementation Manager to lead the post-sales integration for our largest deals. You will guide the project from contract signature through testing, go-live, and handover, acting as the central contact for merchants and internal Mollie teams.

You will coordinate with sales, onboarding, product, engineering and compliance to resolve issues, manage timelines, and keep stakeholders informed with regular updates.