Build Intelligent Microservices via Machine Learning and Big Data Analytics

I had two sessions at O’Reilly Software Architecture Conference in London in October 2016. It is the first #OReillySACon in London. A very good organized conference with plenty of great speakers and sessions. I can really recommend this conference and its siblings in other cities such as San Francisco or New York if you want to learn about good software architectures and new concepts, best practices and technologies. Some of the hot topics this year besides microservices are DevOps, serverless architectures and big data analytics.
Intelligent Microservices by Leveraging Big Data Analytics

One of the two sessions was an updated slide deck of how to apply machine learning and big data analytics to real time event processing. I also included the relation to microservices in this update, i.e. how to leverage microservice concepts such as 12 Factor Apps, Containers (e.g. Docker), Cloud Platforms (e.g. Kubernetes, Cloud Foundry), or DevOps to build agile, intelligent microservices.
Abstract: How to Apply Machine Learning to Microservices

The digital transformation is going forward due to Mobile, Cloud and Internet of Things. Disrupting business models leverage Big Data Analytics and Machine Learning.

"Big Data" is currently a big hype. Large amounts of historical data are stored in Hadoop or other platforms. Business Intelligence tools and statistical computing are used to draw new knowledge and to find patterns from this data, for example for promotions, cross-selling or fraud detection. The key challenge is how these findings can be integrated from historical data into new transactions in real time to make customers happy, increase revenue or prevent fraud. "Fast Data" via stream processing is the solution to embed patterns - which were obtained from analyzing historical data - into future transactions in real-time.

This session uses several real world success stories to explain the concepts behind stream processing and its relation to Hadoop and other big data platforms. It discusses how patterns and statistical models of R, Spark MLlib, H2O, and other technologies can be integrated into real-time processing by using several different real world case studies. The session also points out why a Microservices architecture helps solving the agile requirements for these kind of projects.

A brief overview of available open source frameworks and commercial products shows possible options for the implementation of stream processing, such as Apache Storm, Apache Flink, Spark Streaming, IBM InfoSphere Streams, or TIBCO StreamBase.

A live demo shows how to implement stream processing, how to integrate machine learning, and how human operations can be enabled in addition to the automatic processing via a Web UI and push events.
How to Build Intelligent Microservices - Slide Deck from O'Reilly Software Architecture Conference.

Keywords: Big Data, Fast Data, Machine Learning, Analytics, Analytic Model, Stream Processing, Event Processing, Streaming Analytics, Real Time, Hadoop, Spark, MLlib, Streaming, R, TERR, TIBCO, Spotfire, StreamBase, Live Datamart, H20, Predictive Analytics, Data Discovery, Insights, Patterns

Transcript

1. Kai Wähner Technology Evangelist kontakt@kai-waehner.de LinkedIn @KaiWaehner www.kai-waehner.de O’Reilly Software Architecture Conference 2016 (London, UK) How to apply big data analytics and machine learning to real-time processing of microservice events
2. © Copyright 2000-2016 TIBCO Software Inc. Digital Transformation - Physical and Digital Worlds are Merging
3. © Copyright 2000-2016 TIBCO Software Inc. Apply Big Data Analytics to Real Time Processing
4. © Copyright 2000-2016 TIBCO Software Inc. Analyze and Act on Critical Business Moments
5. © Copyright 2000-2016 TIBCO Software Inc. Key Take-Aways Ø Insights are hidden in Historical Data on Big Data Platforms Ø Machine Learning and Big Data Analytics find these Insights by building Analytics Models Ø Event Processing uses these Models (without Redevelopment) to take Action in Real Time
6. © Copyright 2000-2016 TIBCO Software Inc. Agenda 1) Machine Learning and Big Data Analytics 2) Building an Analytic Model 3) Real Time Processing 4) Live Demo 5) Intelligent Microservices
7. © Copyright 2000-2016 TIBCO Software Inc. Agenda 1) Machine Learning and Big Data Analytics 2) Building an Analytic Model 3) Real Time Processing 4) Live Demo 5) Intelligent Microservices
8. Machine Learning …. allows computers to find hidden insights without being explicitly programmed where to look.
9. Real World Examples of Machine Learning Spam Detection Search Results + Product Recommendation Picture Detection (Friends, Locations, Products) Machine Learning is already present in daily life… Now, every enterprise is beginning to leverage it! The Next Disruption: Google Beats Go Champion
10. © Copyright 2000-2016 TIBCO Software Inc. Example: Decision Tree – Titanic Survival Rate family size Wikipedia
11. Decision Tree – Product Pass / Fail by Equipment Sensor Readings Bad Product Good Product Step 8 Temperature < 122 C >= 122 C Step 2 Recipe A B Step 11 Pressure TV Color Display Problem
12. Decision Tree – Training and Test Data Sets
13. © Copyright 2000-2016 TIBCO Software Inc. Ensemble Tree Algorithms • Random Forest, Gradient Boosting Machine (GBM) • Method – Average many simple trees • Sample the data: fit a simple tree • Re-sample the data; up-weighting the observations that weren’t fitted well in previous model • Continue adding trees until fit is good • Save all the trees and average them • Better fit + prediction than single trees
14. © Copyright 2000-2016 TIBCO Software Inc. Closed Loop for Big Data Analytics
15. © Copyright 2000-2016 TIBCO Software Inc. Analytics Maturity Model Immediate Long-Term Competitive Advantage Value to the Organization A good Big Data Analytics platform can provide value to the organization across the full spectrum of use cases Self-service Dashboards Event Processing Advanced Analytics Measure Diagnose Predict Optimize Alert Automate Analytics Maturity Visual Analytics Event Processing Analytics
16. © Copyright 2000-2016 TIBCO Software Inc. Analytics Maturity Model Immediate Long-Term Competitive Advantage Value to the Organization Visual Analytics Event Processing Advanced Analytics Measure Diagnose Predict Optimize Alert Automate Analytics Maturity A good Big Data Analytics platform can provide value to the organization across the full spectrum of use cases Analytics
17. © Copyright 2000-2016 TIBCO Software Inc. Analytics Maturity Model Immediate Long-Term Competitive Advantage Value to the Organization Self-service Dashboards Event Processing Advanced Analytics Measure Diagnose Predict Optimize Alert Automate Analytics Maturity A good Big Data Analytics platform can provide value to the organization across the full spectrum of use cases Visual Analytics Event Processing Analytics
18. © Copyright 2000-2016 TIBCO Software Inc. The first task in a new analytics projects is to define a Business Case!
19. © Copyright 2000-2016 TIBCO Software Inc. From a Business Case to Proactive Actions Model Present Data Wrangling Signals Dashboards SAP Historian Production Well Filter Enrich Merge Shape Explore Clean Assemble Data Business Case Increase Productivity Grow Revenue Completions Visualize GeoLocation Production Value Theses Reduce Risk G&G Equipment Decision, Action Prediction Action Develop Model Pressure Temperature Production Interrupt Drill Bit Movement Equipment Failure
20. © Copyright 2000-2016 TIBCO Software Inc. Agenda 1) Machine Learning and Big Data Analytics 2) Building an Analytic Model 3) Real Time Processing 4) Live Demo 5) Intelligent Microservices
21. © Copyright 2000-2016 TIBCO Software Inc. Analytical Pipeline
22. © Copyright 2000-2016 TIBCO Software Inc. Analytics Maturity Model Immediate Long-Term Competitive Advantage Value to the Organization A good Big Data Analytics platform can provide value to the organization across the full spectrum of use cases Self-service Dashboards Event Processing Advanced Analytics Measure Diagnose Predict Optimize Alert Automate Analytics Maturity Visual Analytics Event Processing Analytics
23. What is Predictive Analytics?
24. © Copyright 2000-2016 TIBCO Software Inc. Analytical Pipeline
25. © Copyright 2000-2016 TIBCO Software Inc. Variety of Data in Enterprises Custom GUI-driven data access via SDK Siebel eBusiness Local data sources Access Excel STDF Drag-and-drop MySQL SQL Server Oracle Information Services (join, transform, reusable, parameterized, dynamic query for in-memory use) Databases JDBC/ODBC Hadoop SFDC PostgreSQL Teradata Netezza Etc. XML RDBMS Flat Files Spread- sheets Web Services Oracle E-Business RDBMS RDBMS RDBMS SAP BW SAP R/3 D A T A F A B R I C Salesforce ODBC OLE DB SqlClient Direct connection Oracle TeradataAster MS SSAS Teradata Direct Query (dynamically query and retrieve data for visualization and analysis) Databases MySQL Etc. OBIEE Netezza Hadoop
26. © Copyright 2000-2016 TIBCO Software Inc. Data Acquisition “Smart Recommendation Engine”
27. © Copyright 2000-2016 TIBCO Software Inc. Analytical Pipeline
28. © Copyright 2000-2016 TIBCO Software Inc. Data Munging / Wrangling / Mash-up
29. cust_id dept sku dollar gift date 1 104 C 12003 2.40 FALSE 2016-10-17 2 105 A 12005 62.85 FALSE 2016-10-17 3 102 C 12007 69.23 TRUE 2016-10-17 4 104 B 12004 9.33 FALSE 2016-10-18 5 105 C 12010 14.16 TRUE 2016-10-18 6 101 B 12003 90.43 FALSE 2016-10-19 7 103 C 12005 90.97 FALSE 2016-10-19 n … … … … … … cust_id A B C total # orders first_dat e last_dat e 1 100 21.76 23.67 0.00 45.43 2 2016-10- 19 2016-10- 20 2 101 0.01 74.65 0.00 74.66 3 2016-10- 19 2016-10- 20 3 102 0.00 60.92 50.29 111.21 6 2016-10- 17 2016-10- 20 4 103 0.00 0.00 52.30 52.30 2 2016-10- 19 2016-10- 20 © Copyright 2000-2016 TIBCO Software Inc. Data Munging - Transformations
30. © Copyright 2000-2016 TIBCO Software Inc. Analytical Pipeline
31. © Copyright 2000-2016 TIBCO Software Inc. Exploratory Data Analysis
32. Exploratory Data Analysis (EDA) is an approach/philosophy for data analysis that employs a variety of techniques (mostly graphical) 1. to maximize insight into a data set 2. uncover underlying structure 3. extract important variables 4. detect outliers and anomalies 5. test underlying assumptions 6. develop parsimonious models 7. determine optimal factor settings © Copyright 2000-2016 TIBCO Software Inc. Exploratory Data Analysis
33. “The greatest value of a picture is when it forces us to notice what we never expected to see” John W. Tukey, 1977 © Copyright 2000-2016 TIBCO Software Inc. Exploratory Data Analysis
34. Visual Analytics - Interactive Brush-Linked © Copyright 2000-2016 TIBCO Software Inc. … and “Inline Data Wrangling” à Ad-hoc data preparation instead of just ETL
35. © Copyright 2000-2016 TIBCO Software Inc. Analytics Maturity Model Immediate Long-Term Competitive Advantage Value to the Organization Visual Analytics Event Processing Advanced Analytics Measure Diagnose Predict Optimize Alert Automate Analytics Maturity A good Big Data Analytics platform can provide value to the organization across the full spectrum of use cases Analytics
36. What is Predictive Analytics?
37. © Copyright 2000-2016 TIBCO Software Inc. Analytical Pipeline
38. © Copyright 2000-2016 TIBCO Software Inc. Which picture represents a model? A model is a simplification of the truth that helps you with decision making.
39. © Copyright 2000-2016 TIBCO Software Inc. Model Building
40. © Copyright 2000-2016 TIBCO Software Inc. Model Building
41. Employees who write longer emails earn higher salaries! © Copyright 2000-2016 TIBCO Software Inc. Model Building
42. © Copyright 2000-2016 TIBCO Software Inc. Model Improvement
43. Managers Staff © Copyright 2000-2016 TIBCO Software Inc. Model Improvement
44. © Copyright 2000-2016 TIBCO Software Inc. Analytical Pipeline
45. © Copyright 2000-2016 TIBCO Software Inc. Model Validation How is the IQ of a kid related to the IQ of his / her mum?
46. © Copyright 2000-2016 TIBCO Software Inc. Frameworks and Tooling
47. © Copyright 2000-2016 TIBCO Software Inc. “…as a next-generation data discovery capability that automatically finds and explains insights from advanced analytics to business users or citizen data scientists” Smart Data Discovery (for the Business User) Leverage Machine Learning without the help of a Data Scientist
48. Advanced Analytics and Big Data Tools (for Data Scientists) Many more ….
49. R Language • Built for data scientists • Very active community © Copyright 2000-2016 TIBCO Software Inc.
50. R with Revolution Analytics (now Microsoft) © Copyright 2000-2016 TIBCO Software Inc. Open Source GPL License (including its restrictions) http://www.revolutionanalytics.com/webinars/introducing-revolution-r-open-enhanced-open-source-r-distribution- revolution-analytics
51. TIBCO has rewritten R as a Commercial Compute Engine • Latest statistics scripting engine: S a S-PLUS® a R a TERR • Runs R code including CRAN packages Engine internals rebuilt from scratch at low-level • Redesigned data objects, memory management • High performance + Big Data TERR is licensed from TIBCO • TERR Installs (free) with Spotfire Analyst / Desktop + other TIBCO products • Spotfire Server can manage all TERR / R scripts, artifacts for reuse • Standalone Developer Edition • Supported by TIBCO • No GPL license issues © Copyright 2000-2016 TIBCO Software Inc. TERR - TIBCO’s Enterprise Runtime for R
52. Which R to use? © Copyright 2000-2016 TIBCO Software Inc. http://www.forbes.com/sites/danwoods/2016/01/27/microsofts-revolution-analytics-acquisition-is-the-wrong- way-to-embrace-r/
53. © Copyright 2000-2016 TIBCO Software Inc. Apache Spark General Data-processing Framework à However, focus is especially on Analytics (at least these days)
54. Apache Spark MLlib © Copyright 2000-2016 TIBCO Software Inc. Spark ML is Spark’s machine learning library. Its goal is to make practical machine learning scalable and easy. It consists of common learning algorithms and utilities, including classification, regression, clustering and collaborative filtering. General Data-processing Framework à However, focus is especially on Analytics (at least these days) x
55. © Copyright 2000-2016 TIBCO Software Inc. H2O.ai An Extensible Open Source Platform for Analytics • Best of Breed Open Source Technology • Easy-to-use Web UI and Familiar Interfaces • Data Agnostic Support for all Common Database and File Types • Massively Scalable Big Data Analysis • Real-time Data Scoring (“Nanofast Scoring Engine”) http://www.h2o.ai/
56. TIBCO Spotfire with R / TERR Integration © Copyright 2000-2016 TIBCO Software Inc. Let the business user leverage Analytic Models (created by the Data Scientist) to find insights! Example: Customer Churn with Random Forest Algorithm • ‘refresh model’ button lives a ‘random forest algorithm’ • requires no a priori assumptions at all, it just always works • The business user doesn’t need to know what random forest is to be empowered by it Select variables for the model
57. TIBCO Spotfire with H2O Integration © Copyright 2000-2016 TIBCO Software Inc. Example: Predictive Analytics for Manufacturing (“scrap parts as early as possible”)
58. TIBCO Spotfire with H2O Integration © Copyright 2000-2016 TIBCO Software Inc. Example: Predictive Analytics for Manufacturing (“scrap parts as early as possible”)
59. © Copyright 2000-2016 TIBCO Software Inc. SaaS Machine Learning • Managed SaaS service for building ML models and generating predictions • Integrated into the corresponding cloud ecosystem • Easy to use, but limited feature set and potential latency issues if combined with external data or applications http://docs.aws.amazon.com/machine-learning/latest/dg/tutoria
60. © Copyright 2000-2016 TIBCO Software Inc. PMML (Predictive Model Markup Language ) • XML-based de facto standard to represent predictive analytic models • Developed by the Data Mining Group (DMG) • Easily share models between PMML compliant applications (e.g. between model creation and deployment for operations)
61. © Copyright 2000-2016 TIBCO Software Inc. Agenda 1) Machine Learning and Big Data Analytics 2) Building an Analytic Model 3) Real Time Processing 4) Live Demo 5) Intelligent Microservices
62. © Copyright 2000-2016 TIBCO Software Inc. Analytics Maturity Model Immediate Long-Term Competitive Advantage Value to the Organization Self-service Dashboards Event Processing Advanced Analytics Measure Diagnose Predict Optimize Alert Automate Analytics Maturity A good Big Data Analytics platform can provide value to the organization across the full spectrum of use cases Visual Analytics Event Processing Analytics
63. What is Prescriptive Analytics?
64. © Copyright 2000-2016 TIBCO Software Inc. Real Time Streaming Analytics time 1 2 3 4 5 6 7 8 9 Event Streams • Continuous Queries • Sliding Windows • Filter • Aggregation • Correlation • …
65. © Copyright 2000-2016 TIBCO Software Inc. Operational Intelligence and Human Interaction Actions by Operations Human decisions in real time informed by up to date information 65 Automated action based on models of history combined with live context and business rules Machine-to-Machine Automation
66. © Copyright 2000-2016 TIBCO Software Inc. Alternatives for Streaming Analytics (no complete list!) Azure Microsoft Stream Analytics CLOSED SOURCE OPEN SOURCE FRAMEWORK PRODUCT
67. © Copyright 2000-2016 TIBCO Software Inc. What Kind of Streaming Analytics do you need? Visual IDE (Dev, Test, Debug) Simulation (Feed Testing, Test Generation) Live UI (monitoring, proactive interaction) Maturity (24/7 support, consulting) Integration (out-of-the-box: ESB, MDM, etc.) Library (Java, .NET, Python) Query Language (often similar to SQL) Scalability (horizontal and vertical, fail over) Connectivity (technologies, markets, products) Operators (Filter, Sort, Aggregate) Time to Market Streaming Frameworks Streaming Products Slow Fast Streaming Concepts
68. © Copyright 2000-2016 TIBCO Software Inc. Comparison of Stream Processing Frameworks and Products Slide Deck from JavaOne 2015: http://www.kai-waehner.de/blog/2015/10/25/ comparison-of-stream-processing-frameworks-and-products/ Updated slide deck coming in November 2016 (Big Data Spain, Madrid)
69. © Copyright 2000-2016 TIBCO Software Inc. Visual Coding for Streaming Analytics • Streaming Operators • Connectivity • Visual Development • Testing & Simulation • Mature Tooling / Support • Middleware Integration
70. © Copyright 2000-2016 TIBCO Software Inc. Live Visual Analytics UI Dynamic aggregation Live visualization Ad-hoc continuous query Alerts Action
71. © Copyright 2000-2016 TIBCO Software Inc. How to apply analytic models to real time processing without redevelopment? Stream Processing H20.ai Open Source R TERR Spark ML MATLAB SAS PMML
72. © Copyright 2000-2016 TIBCO Software Inc. TIBCO StreamBase Connector for R and TERR
73. © Copyright 2000-2016 TIBCO Software Inc. TIBCO StreamBase Connector for H2O.ai
74. © Copyright 2000-2016 TIBCO Software Inc. TIBCO StreamBase Connector for PMML
75. © Copyright 2000-2016 TIBCO Software Inc. Real World Streaming Application for Customer Churn
76. © Copyright 2000-2016 TIBCO Software Inc. Closed Loop à Automatically Re-Compute (and Improve) the Analytic Model Compute your performance metric Spot not good enough performance Re-compute model
77. © Copyright 2000-2016 TIBCO Software Inc. Agenda 1) Machine Learning and Big Data Analytics 2) Building an Analytic Model 3) Real Time Processing 4) Live Demo 5) Intelligent Microservices
78. • Reactive – Run to failure • Preventive – Scheduled service (reliability) • Condition-based – Monitor condition (sensors) • Predictive – Predict failures • Proactive – Deploy automatic actions Evolution of Equipment Maintenance Strategies
79. Scenario: Predictive Scrapping of Parts in an Assembly Line Goal: Scrap parts as early as possible automatically to reduce costs in a manufacturing process. Question: When to scrap a part in Station 1 instead of doing re-work or sending it to Station 2? Station 1 Station 2 Cost Before 9€ 7€ 13€ Total Cost 29€ (or more) Scrap? Scrap?
80. Fast Data Architecture for Predictive Maintenance Operational Analytics Operations Live UI CSV Batch JSON Real Time XML Real Time Streaming Analytics Action Aggregate Rules Analytics Correlate Live Datamart Continuous query processing Alerts Manual action, escalation HISTORICAL ANALYSIS Data Scientists Flume HDFS Spotfire R / TERR HDFS Hadoop (Cloudera) StreamBase TIBCO Fast Data Platform H2O Oracle RDBMS Avro Parquet … PMML Internal Data
81. TIBCO Spotfire with H2O Integration Data Discovery / Data Mining (“Are parts that repeat a station more likely scrap parts?”)
82. TIBCO Live Datamart Operational Intelligence (“Monitor the manufacturing process and change rules in real time!”) Live Dartmart Desktop Client
83. TIBCO Live Datamart Operational Intelligence (“Monitor the manufacturing process and change rules in real time!”) Live Dartmart Web API
84. TIBCO Spotfire + StreamBase + H2O.ai + Live Datamart Live Demo Live Demo
85. © Copyright 2000-2016 TIBCO Software Inc. TIBCO Accelerator for Apache Spark 1. Fast Data Preparation for IoT Dozens of enterprise and IoT data preparation adapters: MQTT, Databases; inbound creation of HDFS, Parquet, Hbase, Avro… 2. Spotfire Model Discovery Template Use Spotfire to explore Spark data lake, create predictive model, train in H20, and deploy to Streaming Analytics. 3. Operationalize Predictive Models Zookeeper deployment to StreamBase nodes living in Spark cluster via H20, PMML, TERR models 4. Streaming Analytics for Automation Automate action based on predictive models – make offers to customers, stop fraudulent transactions, alert. 5. Monitor & Retrain Model Monitor behavior of model, retrain when necessary. 6. Drag & Drop for Business Solution Developers Code-free development environment for work with H20, HDFS, Avro, TERR The TIBCO Accelerator for Spark is a TIBCO engineered, light-weight open-source fast- start for systems to stream data into Spark, discover patterns in Spark with Spotfire, and operationalize the insights on Big Data. FUNCTIONAL COMPONENTS
86. © Copyright 2000-2016 TIBCO Software Inc. Agenda 1) Machine Learning and Big Data Analytics 2) Building an Analytic Model 3) Real Time Processing 4) Live Demo 5) Intelligent Microservices
87. © Copyright 2000-2016 TIBCO Software Inc. Evolving Demands from the Business AGILITY & SPEED REDUCED CYCLE TIMES WEB SCALE LOWER COST FAIL FAST
88. © Copyright 2000-2016 TIBCO Software Inc. Development of Intelligent Microservices
89. © Copyright 2000-2016 TIBCO Software Inc. 12 Factor Apps for Cloud Native Microservices Codebase One codebase tracked in revision control, many deploys. Dependencies Explicitly declare and isolate dependencies. Config Store config in the environment. Backing Services Treat backing services as attached resources. Build, Release, Run Strictly separate build and run stages. Processes Execute the app as one or more stateless processes. Port Binding Export services via port binding. Concurrency Scale out via the process model. Disposability Maximize robustness with fast startup and graceful shutdown. Dev / Prod Parity Keep dev, staging, and prod as similar as possible. Logs Treat logs as event streams. Admin Processes Run admin/mgmt tasks as one-off processes. https://12factor.net/
90. © Copyright 2000-2016 TIBCO Software Inc. Why Containers? http://www.slideshare.net/andersjanmyr/docker-the-future-of-devops Containers enable: • Lightweight deployment • Automation • Better resource utilization • Scaling up and down quickly • Platform agnostic deployment • Innovation and Fail Fast Concepts • Standardization ? Ø The Open Container Initiative (OCI) Ø Docker Fork Discussions (!!!)
91. © Copyright 2000-2016 TIBCO Software Inc. DevOps Elements – Culture and Technology! Process Tools Automation Culture Continuous Integration/ Continuous Development APIs Microservices Frequent releases Collaboration
92. © Copyright 2000-2016 TIBCO Software Inc. Develop fast. Fail fast. Change fast. Visual Analytics + Visual Coding + DevOps = Agile Intelligent Microservices
93. © Copyright 2000-2016 TIBCO Software Inc. Application of Analytic Models to other Microservices
94. © Copyright 2000-2016 TIBCO Software Inc. Real Time Streaming Analytics time 1 2 3 4 5 6 7 8 9 Event Streams Apply your intelligent (micro)service to any event. Microservice event. Application event. Legacy event. IoT event. You name it.
95. © Copyright 2000-2016 TIBCO Software Inc. Key Take-Aways Ø Insights are hidden in Historical Data on Big Data Platforms Ø Machine Learning and Big Data Analytics find these Insights by building Analytics Models Ø Event Processing uses these Models (without Redevelopment) to take Action in Real Time
96. Questions? Please contact me! Kai Wähner Technology Evangelist at TIBCO kontakt@kai-waehner.de @KaiWaehner www.kai-waehner.de LinkedIn