Senior Platform Engineer: Scale APIs & Lead Tech

Mollie; Milan (MI); On-site; USD 101,000 - 146,000; Full time

Job summary

Mollie is looking for a Senior Engineer to lead design and development of financial products. You will work on large-scale systems, API services, and cross-functional initiatives to support growth and new markets. The Milan hub collaborates with Data, ML, Platform, and Product teams to accelerate delivery.

You’ll drive architectural decisions, mentor teams, and ensure high engineering standards while expanding Mollie’s payment and money-management platform across Europe.

Qualifications

• 6+ years of experience in developing large-scale applications.
• Experience with Java or PHP (Go/C#/Python also valued).
• Proven experience in leading architectural decisions and technical initiatives.
• Excellent communication with stakeholders.
• Creative problem-solving with a product-first approach.
• Accountability and proactive improvement mindset.

Responsibilities

• Building Large-Scale Systems: Help us design and engineer systems that can scale to handle high volumes of transactions.
• API and Service Development: Design, build, and maintain APIs, services, and systems across Mollie’s engineering teams.
• Tech Leadership: Lead technical initiatives from architecture design to implementation, ensuring engineering excellence.
• Problem-Solving: Utilize your creative problem-solving skills and analytical abilities to resolve complex issues and contribute to our mission of making financial processes effortless.
• Documentation and Knowledge Sharing: Create comprehensive documentation to facilitate domain knowledge sharing and set up optimised processes.
• Engineering Excellence: Own the code quality and engineering excellence and best practices of our systems.

Skills

Large-scale systems

Java

Go

C#

Python

Architectural leadership

Communication

Problem solving

Job description

Mollie is looking for a Senior Engineer to lead design and development of financial products. You will work on large-scale systems, API services, and cross-functional initiatives to support growth and new markets. The Milan hub collaborates with Data, ML, Platform, and Product teams to accelerate delivery.

You’ll drive architectural decisions, mentor teams, and ensure high engineering standards while expanding Mollie’s payment and money-management platform across Europe.