Johan Niklasson, Developer in Stockholm, Sweden
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Johan Niklasson

Verified Expert  in Engineering

Software Developer

Stockholm, Sweden
Toptal Member Since
October 20, 2022

Johan is a multidisciplinary engineer, working with both software and data engineering. This combination of skills gives him a solid mindset to build and adapt applications for producing or consuming data. Having studied economics in addition to computer science, Johan has a deepened understanding of company goals and priorities from a strategic perspective.


H&M Company
Google Cloud Platform (GCP), Python, Java, Data Pipelines, Cloud Dataflow...
Python, Apache Kafka, Apache Flink, Java, Jenkins, PostgreSQL, CI/CD Pipelines...
Svenska Sektionen av Amnesty International
Python, Django, Wagtail CMS, PostgreSQL, Bitbucket, C#, CSS, HTML, Angular...




Preferred Environment

Python, GitHub, MacOS, PyCharm, Slack

The most amazing...

...thing I've developed is a ticket scanning system at a stadium. Watching thousands of people scan their tickets flawlessly was a fantastic feeling.

Work Experience

Data Engineer

2022 - PRESENT
H&M Company
  • Performed as assigned tech lead to a team to create a new customer model on the Google Cloud Platform (GCP).
  • Assisted teams in migrating data from on-premise servers to GCP and how to utilize GCP and its tools the best way.
  • Conducted tech interviews for new data engineering candidates.
Technologies: Google Cloud Platform (GCP), Python, Java, Data Pipelines, Cloud Dataflow, BigQuery, Terraform, GitHub, CI/CD Pipelines, GitHub Actions, SQL, Apache Beam, Pub/Sub

Software Engineer

2020 - 2022
  • Developed intelligent systems to determine and generalize the web structure of eCommerce sites, including CSS selectors of product name, quantity, and product image to create a better customer experience in the app.
  • Built a data pipeline in Apache Flink on AWS Data Kinesis that monitors the teams' product performance in real-time, consuming events from Apache Kafka.
  • Held an active role promoting Python usage across the company and conducted tech interviews for Python candidates.
  • Managed and maintained the open source projects. I was the owner.
Technologies: Python, Apache Kafka, Apache Flink, Java, Jenkins, PostgreSQL, CI/CD Pipelines, Amazon Web Services (AWS), Bitbucket, Data Pipelines, Terraform, SQL, Linux

Software Engineer

2016 - 2020
Svenska Sektionen av Amnesty International
  • Created a new customer management system from scratch using Python, built upon Django.
  • Developed features for the landing website in Wagtail CMS, built upon Python and Django.
  • Created a system to handle thousands of digital signatures to format and filter them before handing them over to embassies for protests.
Technologies: Python, Django, Wagtail CMS, PostgreSQL, Bitbucket, C#, CSS, HTML, Angular, AngularJS, Sass, Linux, Windows, SQL, jQuery, JavaScript

Web Developer

2012 - 2016
Allready Solutions
  • Built an entire system for reading physical ticket barcodes and synchronizing against a participant database, which multiple agents could do in parallel.
  • Developed mobile web applications for events that were used by thousands of people.
  • Participated in the order process, from the first requirements meeting to development, delivery, and follow-up.
Technologies: PL/SQL, CSS, HTML, Web & Mobile Applications, JavaScript, PHP, C#, jQuery, SQL

Who is the Kevin Bacon of Klarna?
I conducted an entertaining public talk while working at Klarna, where I analyzed the company's organizational structure using graph theory to present interesting findings.

For example, it was possible to see how close people worked with each other, how flat the company was, and who is the Kevin Bacon of Klarna—a concept adopted from IMDB where one tries to see who is in the middle of the organization.
2016 - 2019

Bachelor's Degree in Computer Science

KTH Royal Institute of Technology - Stockholm, Sweden




GitHub, Bitbucket, Jenkins, Cloud Dataflow, BigQuery, Terraform, Apache Beam, PyCharm, Slack


Django, Angular, AngularJS


Apache Kafka, Google Cloud Platform (GCP), Linux, Windows, Apache Flink, Amazon Web Services (AWS), MacOS


Python, Java, CSS, HTML, SQL, C#, Sass, JavaScript, PHP


Parallel Programming


PostgreSQL, Data Pipelines, PL/SQL


Pub/Sub, Algorithms, Data Structures, CI/CD Pipelines, GitHub Actions, Wagtail CMS, Web & Mobile Applications, Graph Theory, Graphs

Collaboration That Works

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