Marek Kałużny, Developer in Gdańsk, Poland
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Marek Kałużny

Verified Expert  in Engineering

DevOps Engineer and Developer

Gdańsk, Poland
Toptal Member Since
August 18, 2022

Marek is a certified AWS solutions architect with expertise in delivering IT projects, from shaping the idea and collecting the requirements up to post-go-live support with hands-on experience in delivering large-scale projects. He's comfortable describing architecture to non-technical executives and supporting the team daily. Designing and building new serverless apps, migrating existing workloads to the cloud, or improving the existing solutions are the areas in which he can help the most.


Amazon Web Services (AWS), AWS Cloud Architecture, Node.js, Docker...
Amazon Web Services (AWS), Architecture, Java, Microservices...
Transition Technologies PSC
Java, Integration, Windchill PLM




Preferred Environment

Visual Studio Code (VS Code), Amazon Web Services (AWS), AWS Cloud Architecture, Amazon Elastic Container Service (Amazon ECS), Node.js, JavaScript, TypeScript,, iTerm2, Fast Healthcare Interoperability Resources (FHIR)

The most amazing...

...project I've been involved in is developing the digital COVID-19 pandemic response for NHS UK. The apps designed by me were available for all UK citizens.

Work Experience

Cloud Architect

2021 - PRESENT
  • Helped multiple customers migrate the workload to AWS.
  • Shared knowledge with other developers on the team.
  • Helped customers choose the right technology and maximize the reusability of components.
  • Assisted customers in making informed decisions by providing the AWS CloudWatch dashboards, which are used to understand traffic or pick hours.
Technologies: Amazon Web Services (AWS), AWS Cloud Architecture, Node.js, Docker, Amazon Elastic Container Service (Amazon ECS), Amazon RDS, Cloud Migration

Solutions Architect

2013 - 2021
  • Designed and actively developed serverless applications for UK citizens as a digital response to the COVID-19 pandemic. Worked under high time and reputation pressure in a highly controlled, multivendor environment.
  • Worked as a solution architect on a healthcare product that presented a single patient view combining records from several underlying systems. ETL jobs, real-time integrations, and a significant amount of data to process.
  • Represented the company during the technical design authority meetings presenting technical solutions.
  • Oversaw the penetration test of the delivered applications and worked on addressing the findings.
  • Built and maintained the performance tests tooling with the JMeter cluster.
Technologies: Amazon Web Services (AWS), Architecture, Java, Microservices, Fast Healthcare Interoperability Resources (FHIR), PostgreSQL, Serverless, AWS Lambda, AWS Cloud Architecture

Software Specialist

2011 - 2013
Transition Technologies PSC
  • Worked in the international teams on developing customizations and interfaces for the Windchill PLM system. I managed integrations based on Java and JMS for Nokia and Java for Hager.
  • Participated in conferences. The presentations were on Scrum and mobile development using Sencha Touch.
  • Maintaining and developing custom solutions for SharePoint 2010.
Technologies: Java, Integration, Windchill PLM

Application for Submitting the COVID-19 Test Results

A single-page application in React with serverless AWS services back end for submitting COVID-19 test results.

The number of results submitted through the applications hit hundreds of thousands daily during the peak period. The performance, security, and availability were vital for this application. Additionally, it was the first time that this custom user management system based on AWS Cognito was used on such a scale in the UK.
2013 - 2015

Master's Degree in Computer Science

University of Information Technology and Skills (WSINF Lodz) - Lodz, Poland


AWS Certified Solutions Architect Associate



Node.js, React


Amazon Elastic Container Service (Amazon ECS), Amazon CloudWatch,, Apache JMeter, Amazon Cognito


Amazon Web Services (AWS), AWS Lambda, Visual Studio Code (VS Code), Docker


JavaScript, TypeScript, Java


Agile, Fast Healthcare Interoperability Resources (FHIR), Agile Software Development, Microservices


PostgreSQL, Amazon DynamoDB


OAuth 2


Architecture, Serverless, BlazeMeter, AWS Cloud Architecture, Cloud Migration, iTerm2, Amazon RDS, Integration, Windchill PLM, Cloud Security, Containerization

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