We live in our own bubble of microservices and endlessly horizontal scaling infrastructure, but there is still critical infrastructure that runs the world of financial systems depending on Windows boxes, FTP servers, and single-threaded protocols. This talk is about how to glue these two worlds together, what works for us and what doesn't.

2. Victor Tuson Palau
@victorpalau
victorpalau.net
What Borders? Transactional Banking/FX

3. What I loved about moving to Cloud Native
Decouple services from infrastructure
Encapsulation of running process (incl code, framework,
state)
Clean interfaces
Elasticity and horizontal Scaling
FAST PACE OF DEVELOPMENT

4. 4
If you find yourself alone, riding in the green fields with
the sun on your face, do not be troubled.
For you are in Elysium, and you’re already
CLOUD NATIVE!

5. Finance sector key infrastructure
FIX
(Quoting)
SWIFT
(Moving money)

6. Fun facts about FIX
· Originally authored in 1992
· Built for speed, used everywhere!
· Point to Point protocol, one client per connection
· Open Standard
· Open source implementation - http://www.quickfixengine.org/
· Physical wire option available for purchase!

7. Fun facts about SWIFT
· Funded in 1973
· Connects over 11k+ entities in 204 countries - We are
one of them! via:
· Physical Window servers in data centres
· Physical security tokens plus encryption keys
· sFTP for data upload
· MT messages are Magic Number based messages
· New standard based on XML coming in 2021

10. Containeraise all the things (even when you can’t be elastic)
· Packaging and immutability
· Recovery: Quicker restart and migration to new AZ
· Testability
· Loosely vs strong coupling to infrastructure
· [k8s] (anti-)affinity and taints

11. Adapters | Ambassadors
We write services that behave Cloud Native, and “adapt” or
become “ambassadors” for others
SQS consumer that balances between SWIFT boxes
AWS S3 to sFTP sync
[k8s] Sidecar container for QFX that provide Prometheus endpoints

12. Encapsulate
Keep quirks within a service!
Transformer is a REST api input into an MT or other
quirky standards
Mapping is defined as code
Json is pass across payment services and
translated before sending out
https://www.tracefinancial.com/transformer

13. Asynchronicity with Message Brokers
Protect against delays and down-times spreading through
the systems, enable some horizontal scaling
Separate your queues, take into account processing times of actions
(clogging)
Update dispatcher via call-backs, pub/sub, webhooks
Async REST is also a good option (202 - Accepted)

14. We don’t live in a bubble
But you can do things to keep floating peacefully
Encapsulate
Adapt
Decouple

15. Want to know more?
http://labs.ebury.rocks
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¡¡GRACIAS!!