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Hi, I am Arjen

I can help you

Arjen Stens

Freelance .NET Software Engineer

I am a passionate software engineer with 6 years of working experience. I worked on the intersection between Cloud infrastucture and the software developed on top. I also helped design and build scalable solutions using microservices.

Could you use some help in these areas and need someone who can translate complex technical processes into more accessible language for better decision-making? Then I might be the right person for you! Let’s get in touch and see what’s possible!

Analytical
Team Work

Skills

.NET (Core) Development
.NET (Core) Development

Using as the main language for professional development. Capable of writing scalable, testable, and maintainable programs.
NodeJS + TypeScript
NodeJS + TypeScript

Using for professional development. Capable of writing scalable, testable, and maintainable programs.
AWS
AWS

Working with many AWS services and combining their power to create scalable cloud solutions. Experience with the following Services:

IAM, Lambda, SNS/SQS, RDS, Elasticache, S3, KMS, SSM, ECS/Fargate, EKS, CloudFormation, CodePipeline, CodeBuild, CodeDeploy, ECR, API Gateways, CloudWatch
Terraform
Terraform

Writing various infrastructe-as-code (IaC) modules to quickly spin up new infra and easily repeat this process.
Bash
Bash

Capable of writing bash/shell scripts. Mainly for automating otherwise repetitive tasks on linux systems.
Linux
Linux

Using as the main operating system. Capable of working with linux servers.
Docker
Docker

Deploy most of the programs as dockerized container. Experience with multi-stage build processes.
Python
Python

Mostly used as a fast scripting language to help with tedious manual tasks. For example: Quickly indexing & scanning entire codebases & live infrastructure for Log4J vulnerability in 2021
Scala
Scala

Basic Scala programming, used in various micro-services and for a Marathon plugin.
Cloudflare
Cloudflare

Configuring routing rules and DNS.
PostgreSQL
PostgreSQL

Working with PostgreSQL as the datastore for many (microservice) projects.
Redis
Redis

Used in projects as fast and highly scalable in-memory data store.
Mesos/Marathon
Mesos/Marathon

Deploying services to this microservice-platform and writing a Marathon plugin in Scala.
Swagger
Swagger

Documenting and testing built API functionality. Used as a tool for communicating an application’s functionality to colleagues.
Slack
Slack

Writing slack-bots that helps speeding up lead times for tasks like creating a new database or software project or automatic (Jira) ticket creation.
Jenkins
Jenkins

Used extensively voor CI/CD and creating recurring tasks using Groovy scripts.
Active Directory / LDAP
Active Directory / LDAP

Automating tasks that interact with Active Directory using the LDAP protocol
Git
Git

Experienced with git-based development. Both on Github and GitLab.
C++
C++

Basic C/C++ programming. Used for hobby projects.

Experiences

1
Wehkamp.

Sept 2019 - May 2022, Zwolle

Wehkamp is a leading player on the Dutch e-commerce market with more than half a million daily visitors and 11 million parcels shipped every year.

Back-end Software Engineer - Checkout

Jan 2020 - May 2022

  • Maintining checkout/payment flows on the Wehkamp website.
  • Integrating new payment-methods and Payment Service Providers.
  • Redesigning payment flows for higher scalability and obeservability.
Cloud Platform Engineer

Feb 2020 - Dec 2021

  • Develop internal tooling supporting the product development teams.
  • Bridge the gap between Cloud Infrastructure and Software Development.
  • Maintain and extend functionality of Wehkamp’s own microservice-platform.
Graduation Internship Software Engineering

Sept 2019 - Jan 2020

  • Automate provisioning of new (AWS) infrastructure components.
  • Create new infrastructure using Infrastucture as Code (Terraform).
  • Providing end-users with feedback on processes running in different execution environments.
Software Engineer
RYSST.

Aug 2016 - Aug 2019, Zwolle

RYSST is a start-up that brings together students into self-managing Scrum teams to build solutions for companies.

Responsibilities:
  • Extend and maintain integrations on ESB systems. (Unit4)
  • Design and build Symfony REST API. (Unit4)
  • Design and build system for managing all customer email-subscriptions & integrate with email-marketing software. (Wehkamp)
  • Automate product onboarding by gathering, classifying and sorting product images from suppliers. (Wehkamp)
2
3
Internship on Remote Monitoring of Customer ESB's
Unit4

Apr 2017 - Jun 2017, Hengelo

Unit4 is an enterprise software suite, including finance management, accounting, ERP, FP&A, HCM, and talent management modules.

Responsibilities:
  • Monitor ESB systems at different (physical) locations.
  • Notify support on potential issues and track progress.

Education
Widener University - Chester, PA (USA)
January 2018 - June 2018
Computer Science, Student Exchange Program
Windesheim University of Applied Sciences - Zwolle (NL)
2015-2020
B.Sc. in Computer Science & Engineering

Projects

Arduino Timer Library
Arduino Timer Library
Creator 2017 - 2019

A C++ library for Arduino that helped me to dynamically set and change timed behaviours during runtime.

personal arduino hardware
Details
Arduino Dynamic String Library
Arduino Dynamic String Library
Creator 2019 - 2020

This library was written to accommodate a need for a string class but without the (memory) disadvantages that regular std::string brings on Arduino. The StackString object can hold different sized strings of which only the maximum size is defined at compile-time.

personal arduino hardware
Details

Achievements

Winning Hackathon Independer