Full stack Engineer II

Mollie; Milan (IL); On-site; USD 80,580 - 115,115; Full time

Job summary

Mollie is expanding its Engineering Hub in Milan and seeks a Full Stack Engineer II to join the Customer Onboarding domain. You’ll work on end‑to‑end onboarding experiences, streamline data collection and verification, and ensure a well‑regulated, scalable onboarding process across Mollie’s payment platform.

As part of a small, agile team, you’ll design and implement APIs and UI components, collaborate with product and UI engineers, and help maintain a high standard of code quality with CI/CD

Qualifications

• Minimum of 5 years experience developing full‑stack web apps.
• Prefer PHP/MySQL stack with modern JavaScript frameworks (React/Vue/Angular).
• Experience with CI/CD and deployment pipelines.
• Knowledge of message queues and caching systems (RabbitMQ/Redis/Kafka).
• Enjoy solving cross‑team problems and simplifying complex systems.

Responsibilities

• Be part of a small team focusing on well-defined problems.
• Build large-scale systems and features at speed.
• Collaborate with engineers and product to deliver scale.
• Coordinate with UI teams to maintain consistency.
• Design, build and maintain APIs, UIs, services and systems.
• Analyze and solve complex stack-level challenges.

Skills

Full-stack development

Frontend/backend generalist

JavaScript frameworks

Tools

PHP

MySQL

React

Vue

Angular

RabbitMQ

Redis

Kafka

CI/CD

Job description

Full Stack Engineer

In its journey to become the most loved payment service provider in Europe, Mollie is continuously investing and growing its Engineering department. We recently successfully launched an Engineering Hub in Lisbon and we are set to replicate this journey in one of the most vibrant cities in Europe: Milan!

Milan’s hub will contribute to Mollie’s mission with multiple passionate agile engineering teams that will innovate, build and contribute to our portfolio of next-generation payment products. Our focus is on creating highly scalable solutions that can handle a high volume of payments per second throughout the day. Code quality and system scalability are of paramount importance, and we value forward-thinking experts who can contribute to building scalable systems.

As a Full Stack Engineer II you’ll be a vital part of our Customer Onboarding domain, where we are dedicated to crafting seamless end-to-end onboarding experiences for our customers. Our focus includes optimizing front-end customer experiences, streamlining data collection and verification processes, managing effective customer communications throughout the onboarding journey. We are committed to making it as effortless as possible for businesses to integrate Mollie into their operations and thrive. Our mission includes delivering a well-regulated onboarding experience, leveraging intelligent risk decision-making, and maintaining world-class operational capabilities.

What you’ll be doing

• You will be part of a small team focused on solving clearly defined problem spaces.
• Helping us build large scale systems
• Work closely with engineers and product in order to build features at large scale
• Work with UI engineers from other teams to maintain consistency and share knowledge
• Design, build and maintain APIs, user interfaces, services and systems across Mollie’s engineering teams
• Analyse and solve complex problems across the stack

What you will bring

• Good communication and collaboration skills, we value this the most out of all the things listed here
• Minimum of 5 years experience with developing full-stack web applications, preferably using PHP/MySQL stacks, in combination with modern Javascript frameworks like React, Vue or Angular
• Experience with continuous deployment or continuous integration
• Knowledge of modern queueing and caching systems like RabbitMQ, Redis, or Kafka
• A knack for reducing system complexity, solving cross-team problems, and for striking the right balance between quality and moving fast
• You enjoy being a generalist, working on frontend, backend, as needed to solve problems and delight our users

Our engineering workflow

'Ship early, ship often' is our philosophy. We like to break up big challenges into smaller ones, deploying gradual product iterations and improvements numerous times every day.

We uphold code quality through thorough and cooperative peer reviews, CI/CD build pipelines, and gradual feature roll-outs. In other words, we do everything to make sure you feel comfortable pushing your changes to production on a daily basis.

Our architecture

We come from a monolithic background, with our core systems being written in PHP and Java. As our company started to scale up rapidly, we have scaled our infrastructure along with it by employing queueing systems, service oriented and serverless architecture. For current and future services, we use languages like Java as well.

Mollie’s frontend landscape consists of multiple apps, and each application has its own setup, which is optimised for the app’s purpose. Think of our merchant dashboard, API documentation, mobile apps, etc.

In general, our apps are written using TypeScript, in React. We work with flexible and reusable components, have an extensive UI library that we maintain internally, and are always looking for parts of the codebase that we can open-source and share with the community.

Kindly note that relocation support is not offered for candidates outside of Europe for this role.