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WeAreDevelopers 2022 — Berlin @duffleit

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David Leitner @duffleit Coding Architect david@squer.at @duffleit

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@duffleit Somewhen in 2011.

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@duffleit User <μService> Account <μService> Legder <μService> WebBanking New Payment 💸 Perform Payment € 20, 00 👧 Lisa to David from transferMoney triggerPayment createTransactions

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@duffleit User <μService> Account <μService> Legder <μService> WebBanking Your payment was successfully executed. transferMoney triggerPayment createTransactions ✅

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@duffleit User <μService> Account <μService> Legder <μService> WebBanking New Payment 💸 Perform Payment € 20, 00 👧 Lisa to David from transferMoney triggerPayment createTransactions <μService> Legder Legder <μService>

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@duffleit User <μService> Account <μService> Legder <μService> WebBanking Your payment was successfully executed. transferMoney triggerPayment createTransactions ✅ Retries Timeouts Circuit Breakers Synchronise

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First Generation of MicroServices Synchronously Integrated @duffleit

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment <μService> Legder

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment <μService> Legder

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Queue <μService> Legder

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Queue <μService> Legder

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Queue <μService> Legder

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Queue <μService> Legder

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Queue <μService> Legder

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions Queue <μService> Legder Your payment was accepted. ✅

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions Queue <μService> Legder Your payment was accepted. ✅ Legder <μService>

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions Queue <μService> Legder Your payment was accepted. ✅ Legder <μService>

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions Queue <μService> Legder Your payment was accepted. ✅ Legder <μService> Queue

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions Queue <μService> Legder Your payment was accepted. ✅ Legder <μService> Queue Queue

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Second Generation of MicroServices Message-Driven and Asynchronously Integrated @duffleit

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Legder <μService> Queue Queue Queue

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Legder <μService> Queue Queue Queue As a Customer, I want my transaction to be booked by the ledger.

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Legder <μService> Queue Queue Queue As a Customer, I want the account service to update my balance.

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@duffleit User <μService> Account <μService> WebBanking transferMoney triggerPayment createTransactions New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Legder <μService> Queue Queue Queue As a Customer, I want to transfer money to someone else.

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The Entity Service Antipattern. @duffleit

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Let's create Services along Customer Journeys. @duffleit

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@duffleit “ On the Criteria To Be Used in Decomposing Systems into Modules — Parnas, 1972

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Let's create Services along Customer Journeys. @duffleit

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@duffleit User <μService> Account <μService> WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Legder <μService> Payments <μService> Domain Services Journey Services As a Customer, I want to transfer money to someone else.

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@duffleit User <μService> Account <μService> WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Legder <μService> Web-BFF <μService> Domain Services Backend For Frontends As a Customer, I want to transfer money to someone else. Mobile-BFF <μService> Mobile Banking € 20, 00 Pay Payment Flow Payment Flow

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@duffleit No Domain Logic in Backend For Frontends. It's about Ui-Specific Aggregation, to get rid of over-fetching and over-requesting.

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@duffleit User <μService> Account <μService> WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Legder <μService> Payments <μService> Domain Services Journey Services

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@duffleit User <μService> Account <μService> WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Legder <μService> Payments <μService> Domain Services Journey Services Balance <μService>

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@duffleit ⚡ Customer Journey & Entity Data Mismatch Problem

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@duffleit Users Accounts Transactions Entities Customer Journeys Payments Onboarding Fraud Detection ⚡

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@duffleit User Account WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Transactions Payments Domain Services Journey Services Onboarding Fraud Detection User Account Account Transactions

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@duffleit User Account WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Transactions Payments Domain Services Journey Services Onboarding Fraud Detection User Account Account Transactions ⚡ ⚡ ⚡

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Service Autnomy

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Data Duplication ⚡

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Data Syncronisation 🤯 ⚡

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@duffleit clarify who owns which Data. Always

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Synchronous Calls 😔

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Synchronous Calls 😔

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Cache Account Transactions Synchronous Calls 😔

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@duffleit There must be a better solution 🤔

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@duffleit There must be a better solution 🤔 Payments User Onboarding User pull

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@duffleit There must be a better solution 🤔 Payments User Onboarding User push

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@duffleit Payments Onboarding User Aggregate User Readmodel UserChangedEvent UserChange Command That's CQRS in a nutshell 🥜 update

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@duffleit Payments Onboarding User Aggregate User Readmodel UserChangedEvent UserChange Command Stream

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@duffleit Payments Onboarding User Aggregate User Readmodel UserChange Command Stream UserChangedEvent transform apply

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Stream

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Stream

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Stream

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Stream

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Stream Projections

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Stream Projections

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Stream Projections

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Stream Projections

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Stream

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Stream Projections

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@duffleit But didn't we just introduce Eventual Consistency?

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@duffleit The different faces of Eventual Consistency

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@duffleit Eventual Consistency Eventual Divergence Dashboard User (age: 22) UserChanged (age: 21) UserChanged (age: 22) Profile User (age: 21) ⚡ timestamp timestamp

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@duffleit Eventual Consistency Eventual Divergence Eventual Variance Ledger Stream Transaction (+10€) 🔥

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@duffleit Eventual Consistency Eventual Divergence Eventual Variance Ledger Dashboard Stream 🔥 Transaction (+10€) Transaction (+10€) Balance: 20€

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@duffleit Eventual Consistency Eventual Divergence Eventual Variance Eventual Latency Service B Stream UserChanged (age: 21) UserChanged (age: 22) Profile User (age: 21) Dashboard User (age: 21) User (age: 22)

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Single User Context @duffleit Eventual Consistency Eventual Divergence Eventual Variance Eventual Latency Service B Stream UserChanged (age: 21) UserChanged (age: 22) Profile User (age: 21) Dashboard User (age: 21) User (age: 22) 🕰

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@duffleit Eventual Consistency Eventual Divergence Eventual Variance Eventual Latency same events, different results. same events, different quantity. same events, different realisation. Ordering Guarantees Optimistic UIs At-Least-Once Delivery Deduplication Mechanisms

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@duffleit tl/dr: Eventual Consistency is often used as a knock-out argument @duffleit

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@duffleit tl/dr: Eventual Consistency is often used as a knock-out argument but isn't, in most cases. @duffleit

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@duffleit WebBanking New Payment 💸 € 20, 00 👧 Lisa to David from Perform Payment Payments Journey Services Onboarding Fraud Detection User Account Account Transactions User Account Transactions Stream Projections

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@duffleit Mobile Banking Usage 93% — Show balance & last transactions 3% — Initiate new payment 4% — Any other functionality

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@duffleit Payments Journey Services Onboarding Overview User Account Account Transactions User Account Transactions Stream

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@duffleit Payments Journey Services Onboarding Overview User Account Account Transactions User Account Transactions Stream

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@duffleit Payments Journey Services Onboarding Overview User Account Account Transactions User Account Transactions Stream

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@duffleit Payments Journey Services Onboarding Overview User Account Account Transactions User Account Transactions Stream

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@duffleit Payments Journey Services Onboarding Overview User Account Account Transactions User Account Transactions Stream

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@duffleit Payments Journey Services Onboarding Overview User Account Account Transactions User Account Transactions Stream 93% of what our users need can still be performed. WebBanking Current Balance: 200€ 👧 You sent Lisa 100€ Christoph sent you 300€

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@duffleit WebBanking Current Balance: 200€ 👧 You sent Lisa 100€ Christoph sent you 300€ Payments Journey Services Onboarding Overview User Account Transactions User Account Transactions Stream Overview Transactions We can easily scale horizontally.

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@duffleit WebBanking Current Balance: 200€ 👧 You sent Lisa 100€ Christoph sent you 300€ Payments Journey Services Onboarding Overview User Account Transactions User Account Transactions Stream Overview Transactions We can easily scale horizontally.

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@duffleit WebBanking of David Current Balance: 300€ Christoph sent you 300€ Payments Journey Services Onboarding Overview User Account Transactions User Account Transactions Stream WebBanking of Lisa 👧 New Payment 💸 € 20, 00 David to 👧 Lisa from Perform Payment

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@duffleit WebBanking of David Current Balance: 300€ Christoph sent you 300€ Payments Journey Services Onboarding Overview User Account Transactions User Account Transactions Stream WebBanking of Lisa 👧 New Payment 💸 € 20, 00 David to 👧 Lisa from Perform Payment

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@duffleit WebBanking of David Current Balance: 300€ Christoph sent you 300€ Payments Journey Services Onboarding Overview User Account Transactions User Account Transactions Stream WebBanking of Lisa 👧 New Payment 💸 € 20, 00 David to 👧 Lisa from Perform Payment

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@duffleit WebBanking of David Current Balance: 300€ Christoph sent you 300€ Payments Journey Services Onboarding Overview User Account Transactions User Account Transactions Stream WebBanking of Lisa 👧 New Payment 💸 € 20, 00 David to 👧 Lisa from Perform Payment

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@duffleit WebBanking of David Current Balance: 300€ Christoph sent you 300€ Payments Journey Services Onboarding Overview User Account Transactions User Account Transactions Stream WebBanking of Lisa 👧 New Payment 💸 € 20, 00 David to 👧 Lisa from Perform Payment

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@duffleit WebBanking of David Current Balance: 300€ Christoph sent you 300€ Payments Journey Services Onboarding Overview User Account Transactions User Account Transactions Stream WebBanking of Lisa 👧 New Payment 💸 € 20, 00 David to 👧 Lisa from Perform Payment

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@duffleit WebBanking of David Current Balance: 300€ Christoph sent you 300€ Payments Journey Services Onboarding Overview User Account Transactions User Account Transactions Stream WebBanking of Lisa 👧 New Payment 💸 € 20, 00 David to 👧 Lisa from Perform Payment

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@duffleit WebBanking of David Current Balance: 300€ Christoph sent you 300€ Payments Journey Services Onboarding Overview User Account Transactions User Account Transactions Stream WebBanking of Lisa 👧 New Payment 💸 € 20, 00 David to 👧 Lisa from Perform Payment 👧 Lisa sent you 20€

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@duffleit WebBanking of David Current Balance: 320€ Christoph sent you 300€ Payments Journey Services Onboarding Overview User Account Transactions User Account Transactions Stream WebBanking of Lisa 👧 New Payment 💸 € 20, 00 David to 👧 Lisa from Perform Payment 👧 Lisa sent you 20€

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@duffleit WebBanking of David Current Balance: 320€ Christoph sent you 300€ Payments Journey Services Onboarding Overview User Account Transactions User Account Transactions Stream WebBanking of Lisa 👧 New Payment 💸 € 20, 00 David to 👧 Lisa from Perform Payment 👧 Lisa sent you 20€ GraphQL subscriptions mutations Out-of-the-box real-time capabilities.

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@duffleit WebBanking of David Current Balance: 320€ Christoph sent you 300€ Payments Journey Services Legacy System Accounts Stream 👧 Lisa sent you 20€ User 😮 💨😮 💨 😮 💨 Change Data Capture (CDC) User User

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Third Generation of MicroServices Built on Reactive Data-Streams @duffleit High Resilience 🔥 Horizontal Scaling ↔ Real Time Integration ⏱ Good Integration with Legacy Systems 🏚

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Dimensions of Scaling @duffleit Vertical Horizontal Service

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Dimensions of Scaling @duffleit Vertical Horizontal Service

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Dimensions of Scaling Vertical Horizontal Service Service' Service'' Stream

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Dimensions of Scaling Vertical Horizontal Service Service' Service'' Stream

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Dimensions of Scaling Vertical Horizontal Service Service' Service'' Sharding

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Dimensions of Scaling Vertical Horizontal Service Service' Service'' Sharding Users A-H Users I-P Users Q-Z

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Dimensions of Scaling Vertical Horizontal Service Service' Service'' User from User from Users from Service Service Service Sharding

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@duffleit UserTriggeredPayment

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@duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment

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@duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment

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@duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment Payments Payments Payments

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@duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment Payments Payments Payments ValidPaymentReceived

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@duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment Payments Payments Payments Stream ValidPaymentReceived Partition 0 Partition 1 Partition 2

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Fraud Detection Fraud Detection @duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment Payments Payments Payments Stream ValidPaymentReceived Partition 0 Partition 1 Partition 2 Fraud Detection PaymentCheckedAgainstFraud

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Fraud Detection Fraud Detection @duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment Payments Payments Payments Stream ValidPaymentReceived Partition 0 Partition 1 Partition 2 Fraud Detection Stream PaymentChecked Partition 0 Partition 1 Partition 2

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Fraud Detection Fraud Detection @duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment Payments Payments Payments Stream ValidPaymentReceived Partition 0 Partition 1 Partition 2 Fraud Detection Stream PaymentChecked Partition 0 Partition 1 Partition 2 Ledger Ledger Ledger TransactionBooked

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Fraud Detection Fraud Detection @duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment Payments Payments Payments Stream ValidPaymentReceived Partition 0 Partition 1 Partition 2 Fraud Detection Stream PaymentChecked Partition 0 Partition 1 Partition 2 Ledger Ledger Ledger Partition 0 Partition 1 Partition 2 Stream TransactionBooked

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Fraud Detection Fraud Detection @duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment Payments Payments Payments Stream ValidPaymentReceived Partition 0 Partition 1 Partition 2 Fraud Detection Partition 0 Partition 1 Partition 2 Ledger Ledger Ledger Partition 0 Partition 1 Partition 2 Projecting Transactions Streams Flink Stream PaymentChecked Stream TransactionBooked Independent Shards

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Fraud Detection Fraud Detection @duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment Payments Payments Payments Stream ValidPaymentReceived Partition 0 Partition 1 Partition 2 Fraud Detection Stream PaymentChecked Partition 0 Partition 1 Partition 2 Ledger Ledger Ledger Partition 0 Partition 1 Partition 2 Stream TransactionBooked Shard 0 Shard 1 Shard 2 DataSink Streams Flink Projecting Transactions WebBanking WebBanking WebBanking

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Fraud Detection Fraud Detection @duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment Payments Payments Payments Stream ValidPaymentReceived Partition 0 Partition 1 Partition 2 Fraud Detection Stream PaymentChecked Partition 0 Partition 1 Partition 2 Ledger Ledger Ledger Partition 0 Partition 1 Partition 2 Stream TransactionBooked Shard 0 Shard 1 Shard 2 DataSink Streams Flink Projecting Transactions WebBanking WebBanking WebBanking

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Fraud Detection Fraud Detection @duffleit Stream UserTriggeredPayment Partition 0 Partition 1 Partition 2 UserTriggeredPayment Payments Payments Payments Stream ValidPaymentReceived Partition 0 Partition 1 Partition 2 Fraud Detection Stream PaymentChecked Partition 0 Partition 1 Partition 2 Ledger Ledger Ledger Partition 0 Partition 1 Partition 2 Stream TransactionBooked Shard 0 Shard 1 Shard 2 DataSink 🚀 We can scale nearly unlimited. Projecting Transactions WebBanking WebBanking WebBanking

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Forth Generation of MicroServices Shared and fully Stream Based @duffleit Massive Throughput 🚀 Extremely Scalable ↔

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So many choices, Lets sum up. @duffleit

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Monolith @duffleit

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Monolith @duffleit

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Syncronously 😩 Pain @duffleit

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Modulith @duffleit

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Asyncronously 📦 Shared Data @duffleit

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Reactive ⚡ From Pull to Push @duffleit

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Streaming Massiv Throughput 🚀 @duffleit

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Monolith Reactive Push-Based Async Pull-Based Streamed Availability 🟢 , Resilience 🦺 , Scalability ↔ , Throughput 🚀 Complexity 💰 @duffleit The Rise of Reactive Microservices. And the future of fully Stream Based Architectures.

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David Leitner @duffleit Coding Architect david@squer.at @duffleit

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squer.link / slicing-microservices