Jan Kaczorowski

Full Stack Developer

📍 Warsaw, Poland (Open to Remote)

📧 jan.kaczorowski@gmail.com

🔗 github.com/jan-kaczorowski

linkedin.com/in/jkaczorowski

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Jan Kaczorowski
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Industries I worked for:

FinTech MedTech HoReCa PropTech Retail

About

Full-stack developer with 7+ years of experience building web applications using Ruby, JavaScript, and modern frameworks. Passionate about clean code, user experience, and solving complex problems.

Experience

Backend Developer @ Maxio FinTech

01.2024 - Present 
  • Developed new features related to electronic payments and payment automation APIs
  • Created new features for the Merchant Backoffice UI

Backend Lead Developer @ Hjemmelegene MedTech

05.2022 - 01.2024 
  • Designed GraphQL API for the frontend
  • Implemented 4 new business flows (flu and COVID-19 vaccinations, video & chat consultations)
  • Implemented digital prescriptions feature
  • Implemented 3rd party integrations
  • Maintained infrastructure and CI/CD pipelines on AWS services with Docker and Terraform
  • Created and maintained BI dashboards with AWS QuickSights and PostgreSQL

Backend Developer @ RestaurantWeek HoReCa

08.2020 - 05.2022 
  • Optimizing systems performance
  • Developing GraphQL API
  • Integrating 3rd party services i.e. Salesforce, Klarna, SendGrid
  • Developing business logic

Backend Developer @ YND Technologies Retail

09.2019 - 07.2020 
  • Developing a retail platform based on microservices-oriented architecture in Kubernetes
  • Developing microservices in both Ruby on Rails and Elixir
  • Integrating hardware (label printers, regular printers, barcode scanners etc.)

Backend Developer @ spaceOS PropTech

08.2017 - 08.2019 
  • Lead the tech team as a project manager
  • Developed frontend app in Angular 5/6
  • Developed business logic and REST apis
  • Integrated SALTO smart locks system

Education

Information Technology, Web Applications

Polish-Japanese University of Technology

2010 - 2014

MA, Political Sciences

University of Warsaw

2004 - 2010

Personality Traits

Taking initiative Team player Likes most people Likes cats even more Likes tinkering Does not like prolonged meetings Allergic to arrogance

Tech Skills

Ruby on Rails

8 years

APIs

6 years

GraphQL

5 years

React

4 years

AWS

2 years

PostgreSQL, MySQL

7 years

Technologies I've used

Ruby on Rails Sinatra PostgreSQL REST AWS Docker Terraform GraphQL React Vue.js Next.js JavaScript Python TailwindCSS Hotwire Stimulus Kamal MySQL

Role distribution