Peter Liljenberg - Lead Architect at CGI

Peter Liljenberg

Lead Architect at CGI

Växjö, Sweden

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Summary

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Peter Liljenberg is a Lead Architect with 25 years of experience translating complex business domains—particularly HR, payroll and workforce management—into pragmatic software architectures and clear explanations for both technical and non-technical stakeholders. He has led the design and delivery of cloud-native SaaS services, including a serverless payroll calculation platform implemented in C#, TypeScript and F# on AWS, and currently architects HRM solutions at CGI. A hands-on systems thinker, he has deep performance and low-level experience illustrated by contributions to the popular cross-platform .NET coverage tool Coverlet and compatibility work on rdflib.js, improving module support across JavaScript environments. He combines enterprise-level roadmap thinking with day-to-day engineering, and has a track record of automating system mapping and integrations (Ardoq runbooks using Azure) for complex landscapes. Based in Växjö, Sweden, he pairs formal CS training with business studies and even language pursuits, reflecting broad curiosity and an ability to bridge people, process and code.

25 years of coding experience

18 years of employment as a software developer

German, German at Dalarna University

Business Administration, Business Administration at Linnaeus University

Computer Science, Computer Science at Linköping University

Swahili, Swahili at University of Gothenburg

Stackoverflow

Stats

46reputation

2kreached

1answer

0questions

Github Skills (20)

javascript10

net10

dotnet10

instrumentation10

cross-platform10

amd10

performance-testing10

asp-net10

dotnet-core10

code-coverage10

csharp10

bundle9

unit-testing9

bytecode9

nodejs9

Programming languages (8)

C#CJavaScriptPerlXSLTHTMLJupyter NotebookPython

Github contributions (5)

coverlet-coverage/coverlet

Jun 2018 - Jan 2019

Cross platform code coverage for .NET

Role in this project:

Back-end & Performance Engineer

Contributions:33 reviews, 12 commits, 9 PRs in 6 months

Contributions summary:Peter primarily focused on optimizing the performance of the coverlet code coverage tool. Their contributions include reducing the analysis run time by aggregating hits directly and avoiding quadratic complexity. Furthermore, the user made several changes involving memory-mapped files, demonstrating an understanding of system-level performance enhancements. These efforts resulted in significant improvements to the tool's efficiency, as demonstrated by the user’s test updates.

instrumentationdotnetbytecodeunittestcoverlet

linkeddata/rdflib.js

Nov 2013 - May 2014

Linked Data API for JavaScript

Role in this project:

Full-stack Developer

Contributions:6 commits in 6 months

Contributions summary:Peter primarily focused on improving the module system and compatibility of the rdflib.js library. They implemented support for different JavaScript module environments, including Node.js, AMD/RequireJS, and bare browser environments. The user also addressed compatibility issues related to the DOM tree, ensuring it worked seamlessly with external libraries such as xmldom. Finally, they made updates to fix the AMD define function for compatibility with RequireJS.

json-ldapidata-apidatalinked-data

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