Implementation Manager - Complex Go-Live & Integration

Mollie; Greater London; On-site; GBP 60,000 - 90,000; Full time

Job summary

Mollie in London is seeking a Senior Implementation/Delivery professional to own the post-sales integration for our largest deals, from contract signature through go-live and handover. You will be the central contact for the merchant and internal teams, defining activities, owners, and timelines to deliver a successful go-live.

You will collaborate with sales, onboarding, product, engineering and merchants to resolve issues, review documentation, and keep stakeholders updated.

Qualifications

• 3+ years of experience in implementation, project management, onboarding, delivery, or a similar customer-facing role.
• Experience in payments, fintech, e-commerce is a plus.
• Proven experience managing complex implementations from contract signature through go-live and handover.
• Strong understanding of APIs, integrations and technical documentation, with the ability to investigate implementation issues and work with technical teams.

Responsibilities

• Own the post-sales integration phase for Mollie's largest and most complex deals, from handover through testing to go live.
• Run kickoffs with internal and external stakeholders, setting go live dates and keeping progress on track.
• Organise and track testing, raising issues and feedback as they surface.
• Coordinate across sales, product and engineering colleagues, as well as with merchants directly, to keep everyone aligned.
• Keep agreed go live dates on track, since delays mean missed revenue.
• Maintain documentation and playbooks that make delivery predictable and scalable.

Skills

Implementation management

Project management

Stakeholder management

API integrations

English communication

Tools

APIs

Job description

Mollie in London is seeking a Senior Implementation/Delivery professional to own the post-sales integration for our largest deals, from contract signature through go-live and handover. You will be the central contact for the merchant and internal teams, defining activities, owners, and timelines to deliver a successful go-live.

You will collaborate with sales, onboarding, product, engineering and merchants to resolve issues, review documentation, and keep stakeholders updated.