photo of Katarina Rosiak

Katarina Rosiak

Software Engineer

I’m a full-stack Software Engineer with experience with JavaScript, Node.js, PostgreSQL, React, and AWS. Passionate about creative problem solving and always eager to learn new technologies.

Recently I co-created Seymour , an open-source, AWS-native active monitoring solution specializing in API testing from globally distributed locations.

An image showing Seymour's architecture

Seymour is an open-source and easy-to-configure active monitoring solution that allows users to simulate requests from globally distributed locations to test their API endpoints. For each test, Seymour measures the availability, response time, and correctness of the API endpoint response.

Our team built Seymour to help engineering teams bolster existing testing approaches and handle the challenges of monitoring their increasingly complex systems. Seymour aims to detect issues in production before users experience them and provides geographic distribution of tests, allowing users to configure tests originating from 22 global locations.

Deploying Seymour requires two CLI commands. Once it is set up, Seymour provides a UI for configuring and viewing all tests and alerts, along with an API for programmatic configuration.

  • React
  • PostgreSQL
  • Express
  • AWS
  • EventBridge
  • Lambda
  • SQS
  • SNS
  • ElasticBeanstalk
  • EC2


Other projects

Featured Medium Articles

Jul 21 2021

The Brief Tale About the Evolution of Database Systems

Although it may not appear so nowadays, databases have been used to store and organize information long before computers were even invented. Ancient civilizations were using clay wedged-shaped marks to keep track of record inventories such as food, armor, and more. With time, as more and more data was required to be stored, databases have grown in size and complexity and so did methods to index and retrieve data... Read more

Jan 4 2022

A Nightmare on Bug Street

Imagine being on a coding interview. You hear the interviewer explaining the rules and then you read the problem. You feel that you understood it well and come up with, what you believe is a pretty good solution. Then, when you finally get to the part when you press 'RUN' your world collapses as one by one, each test case returns red, fat 'false'...Read more

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