Implementation Manager I - UK & Nordics

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

Build with us

Since 2004, we've had one clear goal: to make payments and money management effortless for every business in Europe.

Today, more than 250,000 companies use Mollie to get paid, manage money and grow – with products designed to be simple, scalable, and dependable.

With 950+ Mollies across 14+ locations, we care deeply about autonomy and craft. So we work in small teams, with real ownership, and we trust you to make the right decisions.

We're building for the long term, so we provide the tools you need, processes you can rely on, and a balanced work environment to help you do work you're proud of.

Sound like your kind of place? Let's build together.

Your impact

You'll own the post-sales integration phase for Mollie's largest and most complex deals, taking full responsibility from contract signature through go-live and the handover that follows. That means acting as the central point of contact for the merchant and every internal Mollie team involved, setting out the activities, owners, and timelines needed to get each implementation live.

You'll coordinate closely with sales, sales engineering, onboarding, compliance, product, and other teams to resolve issues as they come up, using your technical understanding to assess merchant problems, work through documentation, and route issues to the right place. You'll keep merchants, digital agencies, and internal stakeholders informed with regular updates, and you'll monitor progress against the agreed go-live date so you can act early when timelines are at risk.

This is a newly formed function that's now expanding into new markets. That means you'll have genuine influence over how the role and its processes take shape, working closely with a flat, collaborative team where good practice is shared regardless of hierarchy.

What you'll ship

• 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

What you'll bring

• At least 3 years of relevant 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.
• Solid understanding of APIs, integrations and technical documentation, with the ability to investigate implementation issues and work with technical teams.
• Strong project and stakeholder management skills, including managing timelines, blockers, dependencies and multiple internal and external stakeholders.
• Structured, proactive and pragmatic approach, with strong ownership and the confidence to challenge when needed.
• Excellent communication skills in English

Grow your way

At Mollie, growth is personal. We believe everyone should have the chance to develop their skills, explore new challenges and shape their career on their own terms.

You'll get regular feedback and performance reviews to support your development, with fair and transparent salary reviews along the way. Many Mollies move into new roles or take on new projects to stretch themselves, and we actively hire from within to help you take the next step.

No matter if you're aiming for promotion, exploring a different career path or building new skills, you'll be supported with the tools, trust and opportunities to grow your way.

AI at Mollie

We believe in Always Be Shipping, and AI brings that philosophy to life across every team, every role, every day.

AI is core to how we build. It helps us move faster, simplify work and make smarter decisions, creating real impact for the businesses we serve. We're looking for people who are excited to use AI to shape the future of finance with us.