1. AppTx: Transforming legacy apps…
Pradeep Sadhu
Northern Trust
October 7–10, 2019
Austin Convention Center
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2. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
This information is not intended to be and should not be treated as legal advice, investment advice or tax
advice and is for informational purposes only. Readers, including professionals, should under no
circumstances rely upon this information as a substitute for their own research or for obtaining specific
legal or tax advice from their own counsel. All information discussed herein is current only as of the date
appearing in this material and is subject to change at any time without notice.
Confidentiality Notice: This communication includes confidential material and is meant only for the
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Important Information
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3. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3
How far is your organization with Cloud journey?
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4. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 4
Cloud Native vs Legacy
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5. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5
• Legacy Transformation patterns
• Workloads
• Security & Data
• Vendor Integration
• Skill shortage
Why?
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6. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 6
• Monolithic architecture
• Feature-rich
• Vendors closed shop
• End of life technologies
• Continuously changing –
Security & Data protection
standards
Intricate legacy apps at-large
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7. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 7
• Operational complexities
• Responsiveness
• Speed to market
• Downtime
• User experience
• Tracking & metrics
• External dependencies
• Tech-stack skill shortage
• Lottery factor (Bus factor)
Intricate legacy apps at-large…
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8. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 8
Responsiveness & Speed to market
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Legacy
• Monthly
• Quarterly
• Semi-annual
• Annual
Cloud-Native
• Zero Downtime
• Blue/Green
• Canary
Cloud-Native
Legacy

9. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 9
• Improve Responsiveness & speed to market
• Provide better user experience
• Data driven decision making
• Collect feedback
• Gather metrics to understand behavior & usage patterns
Reason for Modernization
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10. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 10
• Replatform by build 5 or 6 aggregate
services
• Lift and shift code to Pivotal Platform
• Migrate
• Modern UI/UX
• Monolith to Microservices
• Event Driven Architecture
Forging new Paths
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11. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 11
Partnered with Pivotal Modernization services
Journey…
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OKRs
Event
Storming
BORIS
Slice
Analysis
SnapE
Patterns

12. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
• Identify Domains & Context
boundaries
• Trouble Spots
• Helps identify where to start
Event Storming
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Slice
Slice
Slice
Slice
Slice
Slice
Slice
Slice
Slice
Slice
Slice
Slice
Slice
Phase 1
Phase 2
Phase 3
Phase 4
*Phase – is a releasable feature to clients

13. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 13
Event Storming to build the Beauty…
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14. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 14
Arial view of interactions
• Identify Services & Relationships
• Identify UI needs
• REST API and Messaging Queue
needs
• External Dependencies
• Choreography (not Orchestration)
BORIS
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15. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 15
SnapE
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Dig Deep into Details:
• Identify Services flavors
• UI
• Data sources
• External Dependencies
• Risks: Dependencies
• Identify Stories

16. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 16
What we learned about -
• Strangler pattern
• Anti corruption layer
• Event Shunting
Patterns
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Monolith Monolith
Microservice
Microservice
Anti- corruption
layer

17. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 17
Things to ponder about…
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• Lift & Shift – Analyze your app
• Strangle your monolith
• Change chaos
• Dependent systems - roadmap
• Constraints (People, Process, Technology and Funding)
• Tribal Knowledge
• Don’t be Atlas!
• Concerns & Conflicts– Dig deep for the root cause
• Strong opinions, loosely held : Open minded team, not suicide squad

18. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 18
Scaling Modernization
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19. Stay Connected…
Pradeep Sadhu
We are hiring:
https://northerntrustcareers.com/
#springone@s1p
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