Past Meetup

Streaming microservices at Yolt (by ING)

This Meetup is past

80 people went

ING Customer Experience Center (ICEC)

Acanthus building (entrance C), Bijlmerdreef 24 · Amsterdam

How to find us

Use entrance C (there are large letters above the entrances). There will be someone to guide you to the meetup.

Location image of event venue


We’re excited to announce teaming up with the startup Yolt (under the ING umbrella) for our next Meetup! This event will cover streaming microservices using Kubernetes, Kafka and Cassandra.

Yolt ( is about "unthinking money" by creating an app where consumers can aggregate their finances from multiple banks to get a better insight into their finances. It is one of the first companies utilizing open banking and Payment Services Directive 2 (PSD2).

Yolt has grown fast in number of users, over 300k at the moment, and number of employees, from 0 to 60+, in just a few years.
BigData Republic was involved from the start in building the Yolt data backend with Kubernetes, Cassandra, Kafka (streams), Scala and Java. When a user's bank transactions are ingested into Yolt, it triggers a stream of asynchronous microservices. These services enrich the transactions using data science models. Examples of these models are automatic categorization (e.g. bills, groceries), detecting merchants (e.g. Mc Donalds, Spotify) and predicting upcoming transactions (e.g. direct debits, automatic transfers).

In this talk we'll go over the data architecture of Yolt, explain our architectural decisions, the alternatives and their trade-offs.
We'll also explain the use and configuration of the open source tools and technologies so that they'll satisfy our main design goals: scalability, consistency, fault-tolerance and loose coupling in depth.

— Agenda
17:45 - Doors open
18:00 - Food & Drinks
18:30 - Streaming microservices at Yolt
20:00 - Drinks, gezelligheid & networking
21:00 - Everybody out!

— Bio Roderick Simons
Roderick is the CTO of Yolt and has been with Yolt from the very start. He is head of all technical staff and leads efforts to decrease technical debt and architectural soundness.

— Bio Ruurtjan Pul
Ruurtjan is a data engineering consultant at BigData Republic and has worked at Yolt for the past 1.5 years. He and his team are responsible for the data pipeline that processes all bank transactions.

(The event will be held in English.)