Application Engineer II

Amsterdam💼 Full-time🗓 2026-06-08 → 2026-09-26

Core

Design, build, and maintain high-scale backend systems and APIs for financial infrastructure and data products serving 250,000+ businesses in Europe.

Role type

Senior backend engineer (payments/financial infrastructure)

Builds

High-frequency payment processing systems, merchant data products, and scalable financial infrastructure

Domain

Fintech / Payments / Financial Services

Deliverable

production ML models | product features

Required skills

Java, distributed systems, queuing, caching, concurrency, fault tolerance, scalability, end-to-end ownership, product-first approach

Preferred skills

PHP, Go, C#, Python, financial systems background, migration/modernization experience

Technologies

Java, PHP, Go, C#, Python

Responsibilities

Design and build backend systems and APIs at high scale; take ownership of features from architecture to production; contribute to migration and modernization initiatives; transform complex requirements into production-ready solutions; resolve complex issues across distributed systems

Seniority

Senior, hands-on IC

Sourced via ashby · Listed on CareerPlan, which tracks 70,000+ jobs from 20+ sources.

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.