Senior Application Engineer

MilanFull-time2026-10-27 → 2026-11-10

Core

Design and engineer large-scale systems and APIs for next-generation payment products and money management platforms serving businesses in Europe.

Role type

Senior IC application engineer (payments)

Builds

Scalable payment processing systems, APIs, and money management features

Domain

Fintech / Payments

Deliverable

production ML models | product features

Required skills

Java, PHP, Go, C#, Python, system architecture, API design, technical leadership, complex problem-solving, code quality ownership

Preferred skills

Experience with large-scale transaction volumes, product-first approach, cross-functional collaboration

Technologies

Java, PHP, Go, C#, Python

Responsibilities

Design and build scalable systems handling high transaction volumes; Develop and maintain APIs and services; Lead technical initiatives from architecture to implementation; Resolve complex technical issues; Create technical documentation and optimize processes; Ensure code quality and engineering best practices

Seniority

Senior, hands-on IC

About Mollie

Financial Services1168Amsterdam, North Holland, NLFounded 2004

Mollie offers a single platform for businesses to get paid and manage their money. One that makes payments, reconciliation, reporting, fraud prevention, and financing simple for all – from startups to enterprises. Founded in 2004, Mollie’s mission is to make payments and money management effortless for every business in Europe. Our 850-strong team works from offices across the continent, including Amsterdam, Ghent, Lisbon, London, Maastricht, Milan, Munich, Berlin, Kiel and Paris. Today, more than 250,000 businesses use Mollie to drive revenue, reduce costs, and manage funds.