Jan K.


879 euro

My experience


Jan KramerSeptember 2015 - Present

Versatile full stack developer comfortable working with many different technologies. While most of my professional experience is in back-end development with PHP (mainly Symfony), I also have experience with C# (.NET Core), Go, Python and JavaScript (React, Angular). Furthermore, I highly value automated testing, CI/CD, trunk based development and "you build it, you run it".

Raffel InternetSeptember 2015 - Present


Nederlandse Omroep StichtingFebruary 2020 - Present

Contracted by the Nederlandse Omroep Stichting (NOS) to work on:

Move from legacy hosting to a containerized environment (OpenShift)
Help improve systems observability by implementing logging, monitoring and alerting
Implement continuous delivery pipelines
Back-end development of features for major events (UEFA Euro 2020, Olympics, Tour de France)

Royal Schiphol GroupJanuary 2018 - December 2019

Developing and maintaining schiphol.nl.

Technologies: PHP (Symfony), JavaScript, Kubernetes, Docker, Elasticsearch, RabbitMQ, Redis, Varnish

The Things NetworkDecember 2016 - July 2017

The Things Network (TTN) is a decentralized crowd-sourced Internet of Things network, for which I designed and implemented a private blockchain on top of Ethereum as part of my graduation internship. The idea was to boost contributions from the community to the network, by rewarding those contributions with a TTN- specific cryptocurrency. This cryptocurrency can subsequently be exchange for other currencies, or used to purchase premium services.

Technologies: Go, JavaScript (React), Apache Kafka, InfluxDB, Redis, Ethereum

Deft B.V.January 2012 - August 2015

At Deft, we specialized in developing bespoke web-based software solutions for SMEs.
As tech lead (team of 6), I was accountable for the execution of the software development activities. In August 2015, Deft was acquired by one of our customers, which led me to return to university to finish my degree.

Below are some of the projects we carried out.

E-ticketing platform
For a Dutch broadcasting company that organizes events such as concerts, we
developed a platform that enables the online sales of tickets, as well as checking tickets of attendants at the event location using mobile scanners.

Car rental platform
For a car rental agency that operates throughout the Netherlands, we developed an online platform to integrate their fleet, customer and reservation management.

Case management software for IP firm
For an IP firm specializing in patents and trademarks, we developed an application to manage the workflow and billing of their case files.

Technologies: PHP, Go, C#, MySQL, JavaScript, Redis, Elasticsearch, AWS, Docker, CI/CD

Operator Groep DelftNovember 2007 - January 2009

Responsible for performing 1st and 2nd line support tasks at various customers of OGD, e.g. World Wildlife Fund and Utrecht University.

My stack

Varnish, Troubleshooting, Test Driven Development (TDD), Symfony, Software Architecture, Redis, RabbitMQ, PostgreSQL, PHP, Openshift, Nginx, MySQL, Microservices, Machine Learning, Linux, Kubernetes, JavaScript, InfluxDB, Haskell, Go, Git, Functional Programming, ElasticSearch, Docker, DDD, Continuous Delivery, Blockchain, Apache Kafka, AngularJS, Amazon Web Services (AWS)