apidays LIVE India 2022: Accelerating India’s digitisation with APIs May 11 & 12, 2022 Modernising mission-critical applications without stopping the bank Sudhindra Balaji, Senior Vice President, Tribe IT Lead at Danske Bank ------------ Check out our conferences at https://www.apidays.global/ Do you want to sponsor or talk at one of our conferences? https://apidays.typeform.com/to/ILJeAaV8 Learn more on APIscene, the global media made by the community for the community: https://www.apiscene.io Explore the API ecosystem with the API Landscape: https://apilandscape.apiscene.io/ Deep dive into the API industry with our reports: https://www.apidays.global/industry-reports/ Subscribe to our global newsletter: https://apidays.typeform.com/to/i1MPEW

1. Modernizing mission-
critical applications
without stopping the bank
SUDHINDRA BALAJI, SVP – DANSKE BANK

2. 2022 SERIES OF EVENTS
New York
JULY
(HYBRID)
Australia
SEPTEMBER
(HYBRID)
Singapore
APRIL
(VIRTUAL)
Helsinki & North
MARCH
(VIRTUAL)
Paris
DECEMBER
(HYBRID)
London
OCTOBER
(HYBRID)
Hong Kong
AUGUST
(VIRTUAL)
JUNE (VIRTUAL)
India
MAY
(VIRTUAL)
APRIL (VIRTUAL)
Dubai & Middle East
JUNE
(VIRTUAL)
Check out our API Conferences
www.apidays.global
Want to talk at one of our conferences?
apidays.typeform.com/to/ILJeAaV8

3. About me
◦ Technologist at heart, with banking for 20yrs in various roles
◦ Passionate about generating business value through technology
◦ Technology modernization, Cloud and APIs are top-of-mind topics in daily work
◦ Building and being a part of high-performing teams is motivating
◦ Sr. Vice President, Danske Bank (Core Banking)
Sudhindra Balaji

4. Triggers for modernization
◦ IT portfolio – built over decades,
evolutionary architecture, merger of
systems from different acquisitions
◦ Increasing change cost on the IT portfolio
resulting in longer delivery times
◦ Increased operational risk – people,
technology
◦ Restricts our ability to quickly react to
Customer expectations in a competitive
market

5. Key focus areas for modernizing (e.g. Core Banking)
Business drivers
Technology drivers
People &
competence
Risk & value based
workloads
Modernization
approaches
Continuous value
creation
Co-existence
Stopping continued
technical debt
Getting to a ‘done’
state incrementally
The ‘WHY’ The ‘WHAT’ & ‘HOW’ The ‘DONE’ state

6. Design & implementation choices
Business applications
on mainframe
Poorly managed
separation of concerns
Mainframe developers
& BAs, undocumented
portfolio knowledge
Choice of cloud –
private/public
Domain Driven Design
Infuse business &
technical competence
• Prepare for hybrid coexistence
• Focus on data integrity
• Focus on functional integrity
• Take an outside-in view
• Not every functionality needs to be carried
forward
• Simplify & standardize interfaces through APIs
• Hire Cloud-native application developers
• Cross-skill mainframe developers with Cloud
technologies
• Learn key product and portfolio management
disciplines
• Agile delivery methods helps incremental
deliveries
State of the portfolio Implementation choices & approaches

7. 3-phase approach to API
enabling & moving to Cloud

8. Phase-1- introducing distributed read

9. Phase-2 – strangle mainframe consumers

10. Phase-3 – no legacy dependencies

11. APIs – the co-existence tech stack

12. Key API standards in play (incl. coexistence)
API standards
(REST, events, gRPC)
Security (authentication
& authorization)
Consistent error
handling
API payloads &
backward compatibility
API developer portal
through Domain Driven
Design
API & Microservices
observability
DevOps – CI/CD
pipelines
Test automation

13. Summary of learnings
◦ Establishing drivers for
modernization is key to expectation
management
◦ APIs are key, remember to clean-up
technical debt at the backend
services
◦ Have a clear API adoption strategy
with consumers
◦ Have a clear decommissioning
strategy for legacy services
◦ Focus on people’s competence and
attitude towards modernization
◦ Deliver business value in increments