# Microservices: Migration of a Mission Critical System

## TL;DR

This paper presents a real-world case study demonstrating how migrating a mission-critical monolithic system to microservices enhances scalability, based on the FX Core system of Danske Bank.

## Contribution

It provides empirical evidence of scalability improvements through microservices migration in a large-scale, mission-critical financial system.

## Key findings

- Scalability improved after migration to microservices
- Microservices architecture suited for mission-critical systems
- Case study based on a major bank's FX system

## Abstract

The microservices paradigm aims at changing the way in which software is perceived, conceived and designed. One of the foundational characteristics of this new promising paradigm, compared for instance to monolithic architectures, is scalability. In this paper, we present a real world case study in order to demonstrate how scalability is positively affected by re-implementing a monolithic architecture into microservices. The case study is based on the FX Core system, a mission critical system of Danske Bank, the largest bank in Denmark and one of the leading financial institutions in Northern Europe.