	0	1
0	name	ing. Sander Lentink, MSc.
1	currentcity	Lelystad
2	phone	+31617012655
3	email	sv@lent.ink
4	links	github.com/svlentink blog.lent.ink

Experience

	0	1
0	role	Senior Data engineer \| Vattenfall (energy), Amsterdam
1	timespan	July 2021 -> June 2022, 40h p/w (consultant)
2	desc	Optimize offshore wind turbine maintenance by empowering data analysts with tooling, infrastructure and data, so their predictive models can identify the wear on turbine components.
3	activities	Translate business questions into complex SQL queries Creating designs for data extraction, transformation and loading (ETL) Configuring JWT authentication using Envoy proxy for web application backend Enabling developers to run VS-code on k8s Managing Cloud infrastructure through Infrastructure as Code (IaC) Enabling GitOps of AKS and DB on Azure Cloud using Terraform Data transformation in Python using Pandas
4	techniques	Scrum Python Pandas Envoy SQL Apache NiFi AKS Kubernetes Kustomize Dockerfile Linux Git Kafka Swagger PostgreSQL Azure DevOps Terraform Bash REST API PostgREST OmniDB MS Visio Azure Blob Nginx Nexus

	0	1
0	role	Data Platform engineer \| Tennet (energy), Arnhem
1	timespan	July 2020 -> June 2021, 40h p/w (consultant)
2	desc	Enabled the upscaling of renewable energy sources through the creation of data ingestion pipelines to facilitate data scientist in making predictive models. We developed services that ingested from various sources and wrote to HDFS or inserted into a database, while monitoring them using dashboards and alerting.
3	activities	Improving and stimulating innovation relating to security processes through standardization and automation Developing ingestion services using Python Deploying various services using GitOps to container orchestration platform Enabling GitOps of LDAP enabled Grafana instances Enabling developers to run VS-code on the DTAP container platforms Developing multi threaded Python service to ingest data using NiFi Enabling GitOps of Databases (DaaS) Managing prerequisites ingestion services; ACLs, service user, HDFS, Kafka Creation of dashboards visualizing ingestion metrics using Kibana Configuration of Filebeat on container orchestration platform Developing python package to implement standardized JSON log format Enabling GitOps of ElasticSearch watchers for alerting to Slack and email Creating and maintaining internal Python (pypi) packages Developing streaming API in Python between HDFS and HTTP
4	techniques	Scrum Python Dockerfile Linux CI/CD Git SQL Apache NiFi DC/OS Kafka Impala Hue Hadoop HDFS Oracle Swagger PostgreSQL Jenkins Mesos Marathon ELK ElasticSearch Logstash Kibana Grafana Filebeat Kerberos Bash PowerShell SOAP Webdav REST API SFTP Nexus

	0	1
0	role	Cloud Architect \| Rabobank (banking), Utrecht
1	timespan	November 2019 -> June 2020, 40h p/w (consultant)
2	desc	As part of the strategic move away from own data centers (DC) to the Cloud, I helped with setting up the infrastructure for the pilot application (Pega) by creating the automated rollout of a kubernetes (k8s) cluster including the application. We were responsible for designing and executing the first migration, in which I directed the implementation of Infrastructure as Code (IaC) using Terraform.
3	activities	Constant evaluation of business value vs. engineer's wishes for technical improvements Design of Infrastructure as Code (IaC) environment Integrate security principles in IaC, k8s and processes Develop standards and modules in Terraform Optimize CI/CD pipelines and its templates Automate deployment on Azure using Terraform and pipelines Convert existing installation guide to IaC Perform Database tests as part of selection process Direct the IaC team Assisting team with Terraform and container questions
4	techniques	Scrum Scaled Agile Framework (SAFe) Kubernetes Terraform Azure DevOps Python Dockerfile Linux CI/CD Git PostgreSQL Azure Pega (Java) Infrastructure as Code (IaC)

	0	1
0	role	Network engineer \| Surfnet (research), Utrecht
1	timespan	October 2019 -> November 2019, 40h p/w (thesis)
2	projecturl	http://tunroam.org
3	desc	Created wireless protocol that allows the creating of secure public WiFi access points by whitelisting VPN traffic.
4	activities	Modifying 802.1x authentication server to support protocol Design wireless protocol Implement protocol on a Raspberry Pi, making it a wireless Access Point
5	techniques	draw.io LaTeX FreeRADIUS Python Markdown Javascript Git Debian Linux Docker Bash Raspberry Pi Orange Pi Armbian OpenVPN

	0	1
0	role	DevOps engineer \| Rabobank (banking), Utrecht
1	timespan	March 2019 -> October 2019, 24h p/w (consultant)
2	desc	As part of the strategic move away from own data centers (DC) to the Cloud, I rationalized the on premise infrastructure. For this I used Infrastructure as Code (IaC) principles to create a manageable middleware to request resources in their private DC.
3	activities	Strategize transition to containers, to facilitate transition to the Cloud Research options to request resources via ManageIQ using Infrastructure as Code (IaC) Creating ManageIQ Terraform provider using Golang Develop new readable Terraform modules following AWS syntax Develop data parsers in Python for on premise DC management Create coupling between DevOps tools and APIs Optimizing existing IaC templates (YAML and JSON) Containerize Pega using Dockerfile (creation of golden image) Creating platform design drawings Assisting team with Python, Linux, containers, routing and Terraform questions Presenting insights and designs to teams
4	techniques	Scrum Scaled Agile Framework (SAFe) Terraform Docker Python Ansible Alpine Linux ManageIQ Git Go (golang) Swagger Redhat Bitbucket Confluence Infrastructure as Code (IaC)

	0	1
0	role	DevOps Engineer \| Mijndomein (IT), Lelystad
1	timespan	December 2016 -> November 2018, 24h p/w (employee)
2	desc	Automating operations related tasks and implementing new services. Maintaining the uptime of current services; hosting, email, DNS and upgrade internal configuration tools.
3	activities	Developing micro services using Python Enable and connect services to the RabbitMQ message system Optimize operations using Nagios, Elastic search monitoring, Slack notifications Maintenance hosting infrastructure Security audit the infrastructure Ddos intervention Spam and phising email monitoring and prevention Provide software developers with docker platform On-call shift Email platform maintenance Maintenance in data center
4	techniques	Scrum Kanban Python Apache LXC SQL Docker Kubernetes DC/OS Mesosphere Git Exim KVM Debian Linux AWS EC2 RabbitMQ PowerDNS HA-proxy OpenStack Kibana Dokuwiki CertManager

	0	1
0	role	Covert channel researcher \| OS3 (education), Amsterdam
1	timespan	April 2018 -> May 2018, 20h p/w (edu. project)
2	desc	Desk research into the possibilities of hiding data in pictures and sharing them on social media. Various social media converted the images (JPG and BMP), destroying the hidden data.
3	activities	Embed data using various stenography tools Contribute to an open source stenography tool on Github Uploading various data containing images and downloading for validation
4	techniques	Bash Imagemagick LaTeX Docker Git

	0	1
0	role	Blockchain developer \| OS3 (education), Amsterdam
1	timespan	February 2018 -> March 2018, 24h p/w (edu. project)
2	projecturl	http://github.com/svlentink/logdag
3	desc	Classic infrastructures use a central logging server. We created a Proof of Concept which distributes log chunks randomly to other servers and adds a hash of it a blockchain. This makes it infeasible to change the logs.
4	activities	Design and implement blockchain architecture Developing a web interface which shows a representation of the graph in real time Writing the backend code in Python
5	techniques	Python Docker HTML5 Javascript LaTeX D3js Git Dokuwiki

	0	1
0	role	Blockchain researcher \| KPMG (education), Amstelveen
1	timespan	January 2018 -> January 2018, 40h p/w (thesis)
2	desc	Most blockchain technologies demand a participant to always be online, in sync with the blockchain. We wrote a paper on the various consensus mechanisms from the blockchain landscape and showed which are applicable on mobile devices.
3	techniques	LaTeX Docker Git

	0	1
0	role	Container technologist \| OS3 (education), Amsterdam
1	timespan	November 2017 -> December 2017, 24h p/w (edu. project)
2	projecturl	https://github.com/svlentink/container-performance
3	desc	One of the new innovations is serverless. Serverless often requires you to rewrite code. We developed an alternative Proof of Concept, which when triggered (REST API, AMQP message) starts a container and returns its output.
4	activities	Develop PoC in python Generate performance overview using R Bootstrapping VPSes using Bash
5	techniques	Rkt Docker LXC / LXD Python Flask Bash LaTeX R Git

	0	1
0	role	IoT Security researcher \| OS3 (education), Amsterdam
1	timespan	September 2017 -> October 2017, 24h p/w (edu. project)
2	desc	Analysing the data flow of IoT (Internet of Things) devices, to get insight into the security and privacy. We looked at multiple devices, looking at the data and to where it connected to.
3	activities	Configuration IoT devices Analyse tcpdump using Wireshark
4	techniques	Wireshark / tcpdump LaTeX Docker Bash Git Dokuwiki

	0	1
0	role	DevOps Engineer \| Superbuddy (IT), Zwolle
1	timespan	June 2016 -> September 2016, 40h p/w (thesis)
2	desc	As part of my thesis, I've dockerized their monolith and enabled AB testing by separating components into microservices. Adding better monitoring and deployment via CI/CD.
3	activities	System recommendations Dockerizing existing applications Implement CI/CD Enable A/B testing using nginx Advise on VPS providers
4	techniques	Scrum Git Bash Docker Docker-compose Nginx PHP draw.io LaTeX Gitlab

	0	1
0	role	System analyst \| Blendle (digital journalism), Utrecht
1	timespan	February 2016 -> May 2016, 40h p/w (thesis)
2	desc	To reduce the loading time of the application, I've researched various options to implement caching at different layers. When it was clear that everything had a query parameter and that it could not be solved on the network layer, I looked at bottlenecks in their monolith through static code analysis. After founding two code bugs, I managed to get their monolith working by dockerizing it.
3	activities	Creating diagrams of current architecture Dataflow analysis Static code analysis (Ruby) Dockerizing monolith
4	techniques	Scrum draw.io LaTeX Ruby Nginx HAproxy CDN Content Delivery Network Javascript REST API HAL JSON Git

	0	1
0	role	DevOps \| imgZine (IT), Amsterdam
1	timespan	September 2015 -> January 2016, 40h p/w (internship)
2	desc	Developing a Proof of Concept backend which is used for chat inside intranet applications. Dockerized an existing XMPP server and compiled it with WebSocket libraries and developed an HTML5 app which connects to the backend using WebSocket (RFC7395).
3	activities	Developing HTML5 chat client Configure backend Installation script in Bash
4	techniques	Scrum Docker HTML5 XMPP server WebSocket Bash LaTeX Git

	0	1
0	role	NodeJS developer \| Maxedy (IT), Amsterdam
1	timespan	February 2015 -> June 2015, 40h p/w (internship)
2	desc	Deployment using Bash and REST-API in Meteor using OrientDB
3	techniques	Scrum OrientDB Node.js Javascript REST API Bash NoSQL HTML5 draw.io Git Mocha

	0	1
0	role	Grails developer \| Iceberg Webshophands (retail), Dronten
1	timespan	November 2013 -> January 2014, 40h p/w (internship)
2	desc	Proof of Concept; developing online craigslist for fresh food
3	techniques	Scrum Bash Java HTML5 SQL Grails Git

	0	1
0	role	PHP developer \| Windesheim (education), Zwolle
1	timespan	September 2011 -> December 2011, 30h p/w (edu. project)
2	desc	Development of two websites in teams
3	techniques	MySQL PHP5 svn

	0	1	2	3	4
0	MSc.	Security and Network engineering	University of Amsterdam	2017-2019	🎓
1	BSc.	Software engineering	Windesheim	2012-2016	🎓
2	Propedeuse	Computer engineering	Windesheim	2011-2012	🎓
3	community college	Mechatronics	Landstede	2007-2011	🎓

	0	1	2	3
0	minor	Artificial Intelligence	University of Amsterdam	2014
1	minor	Mathematics	Utrecht University	2014
2	minor	Web technology	Windesheim	2013
3	cert.	7 habits of highly effective people	FranklinCovey	November 2012
4	cert.	Introduction Android Development	InfoSupport	December 2011
5	cert.	Basic Safety VCA	Cito	February 2007

Knowledge fields


knowledge tree                                                                  
 +-- Configuration Management CM                                                
 |   +-- CI/CD integration, deployment                                          
 |   |   +-- Azure DevOps                      November 2019  -> 2023           
 |   |   +-- Gitlab                            August 2018    -> November 2018  
 |   |   +-- Travis                            February 2017  -> October 2018   
 |   +-- Infrastructure as Code IaC                                             
 |   |   +-- Ansible                           March 2017     -> August 2019    
 |   |   +-- Terraform                         November 2018  -> 2023           
 |   +-- Version Control Systems VCS                                            
 |       +-- Git                               2013           -> 2023           
 |       |   +-- Gitlab                                                         
 |       |   +-- Github                                                         
 |       |   +-- Bitbucket                                                      
 |       +-- svn                               2012           -> 2013           
 +-- containers                                                                 
 |   +-- Docker                                February 2015  -> 2023           
 |   +-- LXC                                   March 2017     -> 2018           
 |   |   +-- LXD                               November 2017  -> 2018           
 |   +-- Rkt                                   November 2017  -> December 2017  
 |   +-- container orchestration                                                
 |       +-- DC/OS Mesosphere                  February 2017  -> November 2018  
 |       +-- Kubernetes                        June 2018      -> 2023           
 |       +-- Microservices                     June 2016      -> 2018           
 +-- data                                                                       
 |   +-- cache                                                                  
 |   |   +-- Memcache                          April 2017     -> October 2018   
 |   |   +-- Redis                             June 2016      -> October 2018   
 |   +-- data science                                                           
 |   |   +-- D3js                              2015           -> April 2018     
 |   |   +-- Python                                                             
 |   |   |   +-- Numpy                         September 2018 -> October 2018   
 |   |   |   +-- Pandas                        September 2018 -> November 2018  
 |   |   +-- web scraping                                                       
 |   +-- database                                                               
 |   |   +-- MySQL / MariaDB                   October 2011   -> 2023           
 |   |   +-- NoSQL                                                              
 |   |   |   +-- MongoDB                       July 2016      -> October 2018   
 |   |   |   +-- OrientDB                      March 2015     -> June 2015      
 |   |   +-- PostgreSQL                                                         
 |   |   +-- SQL server                        2012           -> 2013           
 |   +-- formats                                                                
 |       +-- AMQP / RabbitMQ                   February 2017  -> 2023           
 |       +-- JSON                                                               
 |       +-- XML                                                                
 |       +-- YAML                                                               
 +-- infrastructure                                                             
 |   +-- FreeRADIUS                            October 2019   -> December 2019  
 |   +-- Linux                                                                  
 |   |   +-- Alpine Linux                      2016           -> 2023           
 |   |   +-- Redhat                            April 2019     -> August 2019    
 |   |   +-- Ubuntu / Debian                   2012           -> 2023           
 |   +-- OpenStack                             January 2017   -> February 2017  
 |   +-- VM                                                                     
 |   |   +-- KVM                               February 2017  -> October 2018   
 |   |   +-- Xen                               November 2017  -> 2023           
 |   +-- cloud                                                                  
 |   |   +-- AWS Amazon Web Services           February 2017  -> November 2018  
 |   |   +-- DNS                               2016           -> 2023           
 |   |   |   +-- bind                          September 2018 -> October 2018   
 |   |   +-- Load balancing                    July 2017      -> September 2018 
 |   |   |   +-- HA-proxy                      March 2016     -> October 2018   
 |   |   +-- Microsoft Azure                   June 2019      -> June 2020      
 |   |   +-- Reverse / TLS proxy                                                
 |   |       +-- Apache                        January 2017   -> September 2018 
 |   |       +-- Nginx                         2015           -> 2023           
 |   +-- monitoring and alerting                                                
 |       +-- Elastic Search                    April 2017     -> July 2018      
 |       |   +-- Kibana                                                         
 |       |   +-- Logstash / grok               November 2017  -> December 2017  
 |       +-- Email                                                              
 |       |   +-- Exim                          April 2017     -> 2019           
 |       |   +-- smarthost                                                      
 |       +-- Nagios                            December 2016  -> November 2018  
 |       +-- Slack API                         2017           -> 2018           
 +-- languages                                                                  
 |   +-- Bash                                  February 2015  -> 2023           
 |   +-- C#                                    January 2013   -> June 2013      
 |   +-- CSS3                                  October 2011   -> 2023           
 |   +-- Go (golang)                           June 2019      -> September 2019 
 |   +-- HTML5                                 September 2011 -> 2023           
 |   +-- Java                                  April 2012     -> January 2014   
 |   +-- Javascript                            February 2015  -> 2023           
 |   +-- LaTeX                                 2014           -> 2019           
 |   +-- Node.js                               February 2015  -> 2018           
 |   +-- PHP                                   September 2011 -> June 2012      
 |   +-- Python                                February 2017  -> 2023           
 |   +-- R                                     November 2017  -> March 2018     
 |   +-- Ruby                                  February 2016  -> May 2016       
 |   +-- SQL                                   September 2011 -> 2023           
 +-- process management                                                         
 |   +-- SDLC                                                                   
 |   |   +-- Agile                                                              
 |   |   |   +-- Kanban                        2013           -> 2023           
 |   |   |   +-- Scrum                         April 2013     -> 2023           
 |   |   |   +-- User stories                                                   
 |   |   +-- Waterfall                         October 2011   -> 2012           
 |   +-- documentation                                                          
 |   |   +-- Confluence                        April 2017     -> October 2019   
 |   |   +-- Dokuwiki                          2017           -> 2019           
 |   |   +-- Markdown                                                           
 |   |   +-- draw.io                                                            
 |   +-- ticketing system                                                       
 |       +-- Github issue system               2014           -> 2023           
 |       +-- Jira                              2016           -> 2019           
 |       +-- Redmine                           April 2013     -> June 2013      
 |       +-- Trello                            2013           -> 2018           
 +-- security                                                                   
     +-- Access control                                                         
     |   +-- Basic-AUTH                        May 2017       -> 2023           
     |   +-- IPTables                          May 2017       -> 2019           
     |   +-- Netfilter                                                          
     |   +-- VPN                               2017           -> 2023           
     +-- Cryptography                                                           
     |   +-- Elliptic-curve cryptography (ECC)                                  
     |   +-- Public Key Infrastructure (PKI)                                    
     |   +-- RSA                                                                
     |   +-- Secure Socket Layer (SSL)                                          
     |   +-- Transport Layer Security (TLS)                                     
     +-- DNSSEC                                October 2018   -> 2019           
     +-- Kali linux                            February 2018  -> April 2018     
     +-- Snort                                 April 2018     -> April 2018     
     +-- Wireshark / tcpdump                   2014           -> 2019

Other

AWS S3, Arduino, Chrome extension, DRY Don't repeat yourself, Flask, FreeRADIUS, Hugo, IPv6, IaaS, Internet of Things IoT, JQuery, KISS Keep it simple, Model View Controller (MVC), NFS, OpenSSH, OpenSSL, PaaS, Progressive Web App (PWA), REST API, RFC, SOAP, SSH, SaaS, Unified Modeling Language (UML), Wordpress, back-end, blockchain, data-mining, gcc, integration testing, makefile, routing, unit test, webpack

Techniques

AKS Kubernetes, Alpine Linux, AMQP / RabbitMQ, Ansible, Apache, Apache NiFi, Arduino, Armbian, Autodesk Inventor, AWS Amazon Web Services, AWS EC2, AWS S3, Azure, Azure Blob, Azure DevOps, back-end, Bash, Basic-AUTH, Bitbucket, blockchain, C#, CDN Content Delivery Network, CertManager, Chrome extension, CI/CD, Confluence, CSS3, D3js, data-mining, DC/OS, DC/OS Mesosphere, Debian Linux, DNS, DNSSEC, Docker, Docker-compose, Dockerfile, Dokuwiki, draw.io, DRY Don't repeat yourself, Elastic Search, ELK ElasticSearch Logstash Kibana, Elliptic-curve cryptography (ECC), Envoy, Excel, Exim, Filebeat, Flask, FreeRADIUS, gcc, Git, Github issue system, Gitlab, Go (golang), Grafana, Grails, HA-proxy, Hadoop, HAL JSON, HAproxy, HDFS, HTML5, Hue, Hugo, IaaS, Imagemagick, Impala, Infrastructure as Code (IaC), integration testing, Internet of Things IoT, IPTables, IPv6, Java, Javascript, Jenkins, JFrog, Jira, JQuery, JSON, Kafka, Kali linux, Kanban, Kerberos, Kibana, KISS Keep it simple, Kubernetes, Kustomize, KVM, LaTeX, Lego, Linux, Load balancing, LXC, LXC / LXD, makefile, ManageIQ, Markdown, Memcache, Mermaid, Mesos Marathon, metal frame construction, Microservices, Microsoft Azure, Mocha, Model View Controller (MVC), MongoDB, MS Visio, MySQL, MySQL / MariaDB, Nagios, Netfilter, Nexus, NFS, Nginx, Node.js, NoSQL, Numpy, OmniDB, OpenShift, OpenSSH, OpenSSL, OpenStack, OpenVPN, Oracle, Orange Pi, OrientDB, PaaS, Pandas, Pega (Java), PHP, PHP5, PostgreSQL, PostgREST, PowerDNS, PowerShell, Progressive Web App (PWA), Public Key Infrastructure (PKI), Python, R, RabbitMQ, Raspberry Pi, Redhat, Redis, Redmine, REST API, RFC, Rkt, routing, RSA, Ruby, SaaS, Scaled Agile Framework (SAFe), Scrum, Secure Socket Layer (SSL), SFTP, sheet metal, Slack API, smarthost, Snort, SOAP, SQL, SQL server, SSH, svn, Swagger, Terraform, Transport Layer Security (TLS), Travis, Trello, Ubuntu / Debian, Unified Modeling Language (UML), unit test, User stories, Visual studio, VPN, Waterfall, web scraping, Webdav, webpack, WebSocket, welding, Wireshark / tcpdump, Wordpress, Xen, XML, XMPP server, YAML

Freelance Data / DevOps / Fullstack / Linux engineer

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