MSMariusz Sielski
@mariuszsielski
Experienced Senior Node.js Developer with a passion for scalable systems.
PolandWhat I'm looking for
As a Senior Node.js Developer, I have a strong background in designing scalable architectures and modern CI/CD systems. My experience spans across various roles, where I have developed high-performing distributed systems and mentored team members to achieve excellence. I thrive on challenges and am passionate about building reliable applications that meet user needs.
At Port Blue Sky, I designed an architecture for an access control propagation module, ensuring secure and scalable access management. My role involved developing new features and resolving bugs using Node.js, Docker, and TypeScript, while also improving testing strategies with Jest and Kafka. Previously, at Kaholo, I supported and enhanced a CI/CD engine, implementing a fully scalable solution based on Node.js microservices.
Throughout my career, I have led teams in building innovative solutions for global banks, including a currency trading module and a collateral management tool. My technical expertise in frontend and backend technologies, combined with my commitment to quality and mentorship, positions me as a valuable asset to any organization.
Experience
Work history, roles, and key accomplishments
Senior Backend Node.js Developer
Port Blue Sky
Mar 2023 - Present (2 years 3 months)
Designed a scalable architecture for an access control propagation module within a distributed system, ensuring secure access management. Developed new features and resolved bugs across legacy systems and new modules using Node.js, Docker, and TypeScript. Improved testing strategies for distributed services with Jest and Kafka, enhancing reliability and maintainability.
Senior Fullstack Developer
Kaholo
Sep 2021 - Sep 2022 (1 year)
Supported and enhanced the core of a CI/CD engine, ensuring seamless and reliable pipeline execution. Designed and implemented a modern, fully scalable CI/CD engine based on Node.js microservices. Developed a sandboxed, Docker-based client code execution engine for secure and isolated execution.
Senior Frontend Developer
GFT Poland
Nov 2017 - Jul 2021 (3 years 8 months)
Implemented a currency trading module for a global bank using React. Led the frontend team in building a collateral management tool for a global bank with Angular 6+. Developed a mobile application for hot desk booking using React Native.
Frontend Developer
Astek
Jan 2016 - Oct 2017 (1 year 9 months)
Created and maintained user interfaces for web applications. Led the migration to a responsive application version using React, improving user experience. Designed and implemented testing strategies using KarmaJS and AngularJS, ensuring application stability.
JavaScript Developer
Pearson
Jun 2012 - May 2015 (2 years 11 months)
Developed backend services using Node.js and built UIs for language skill management portals and medical data monitoring with AngularJS. Improved testing infrastructure to enhance code reliability. Created advanced graphical calculators using PHP, JavaScript, and Python.
Education
Degrees, certifications, and relevant coursework
Adam Mickiewicz University
Postgraduate Studies, Big Data
Completed postgraduate studies focusing on Big Data. Gained expertise in data analysis, processing, and management within large-scale systems.
University of Wroclaw
Bachelor of Computer Science, Computer Science
Obtained a Bachelor's degree in Computer Science. Developed a strong foundation in computer science principles, programming, and software development.
Tech stack
Software and tools used professionally
Availability
Location
PolandAuthorized to work in
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