Senior Application Engineer

Mollie

Lisbon💼 Full-time🗓 2026-06-15 → 2026-09-26

Core

Designing and engineering large-scale systems to handle high volumes of transactions for financial products.

Role type

Senior IC application engineer (payments infrastructure)

Builds

Scalable payment processing systems and money management platforms

Domain

Fintech / Payments

Deliverable

production ML models | product features | infrastructure

Required skills

Large-scale application development, architectural decision-making, end-to-end solution delivery, process optimization, mentoring junior developers, complex problem-solving, code quality ownership

Preferred skills

PHP, Java, Go, C#, Python

Technologies

PHP, Java, Go, C#, Python

Responsibilities

Designing and engineering systems that scale to handle high transaction volumes; Iterating on product features from idea to final solution; Providing guidance and support to junior team members; Leading technical initiatives from architecture design to implementation; Resolving complex issues to improve financial processes; Creating comprehensive documentation for domain knowledge sharing; Owning code quality and engineering best practices

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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.