Michal K.

Michal K.

Fullstack developer

Poland
Trusted member since 2025
14 years of experience

He has led development teams on complex projects, including rescuing a high-pressure initiative at HyperInteractive. His work included integrating MQTT messaging, optimizing database queries, and implementing autoscaling, significantly improving system performance and enabling successful follow-up projects.

Holding a Master’s degree in Computer Science, Michal combines deep technical expertise with strong leadership skills, consistently delivering high-performance solutions. He thrives in challenging environments and drives innovation across web development projects.

Main expertise

JavaScriptJavaScript12 years
React.jsReact.js9 years
Next.jsNext.js9 years
UIUI12 years
25+

Experience8

MKDev

Full-Stack Software Engineer

MKDev
Financial Technology (FinTech)
Sep 2025 · 1y 1m

• Implemented SOC 2 compliance requirements like notification and alert system on suspicious activity

• Performed security hardening of infrastructure and application code in preparation for pentester audit, addressing identified vulnerabilities and misconfigurations

• Enhanced testing workflow by restructuring the existing test suite, improving coverage, reliability, and CI execution times

• Ensured idempotency for critical financial flows, eliminating duplicate transaction risks and guaranteeing safe retries

• Enhanced AI workflows for development by creating new skills, rules, and automation patterns that improve coding efficiency and consistency

React.jsReact.js
DockerDocker
PostgreSQLPostgreSQL
AWSAWS
TypeScriptTypeScript
9+
Resolution

Full-Stack Software Engineer

Resolution
Information Technology (IT) and Services
Apr 2024 - Aug 2025 · 1y 4m
  • Was responsible for contributing to the development of Custom Charts, a reporting tool for Jira and Confluence, including continuous feature improvements and frontend–backend integration.
  • Ensured high code quality while expanding and maintaining product functionality.
  • Participated in code reviews and refinement meetings, and implemented, upgraded, and maintained frontend features integrated with backend services.
  • Improved product performance and user experience, contributing to increased customer satisfaction.
JavaScriptJavaScript
React.jsReact.js
MongoDBMongoDB
DockerDocker
AWSAWS
17+

Full-Stack Software Engineer

Old Street Solutions (acquired later by Tempo)
Information Technology (IT) and Services
Apr 2023 - Apr 2024 · 1y
  • Contributed to the development of Custom Charts, a reporting tool for Jira & Confluence, involving continuous feature enhancements and frontend-backend integration.
  • Ensured high code quality while extending product functionality.
  • Participated in code reviews and refinement meetings, implemented and upgraded frontend features integrated with backend services.
  • Enhanced product performance and user experience, leading to increased customer satisfaction.
JavaScriptJavaScript
React.jsReact.js
DockerDocker
AWSAWS
HTMLHTML
9+
Hyperinteractive Studio

Technical Lead

Hyperinteractive Studio
Information Technology (IT) and Services
Dec 2020 - Apr 2023 · 2y 4m
  • Successfully managed a failing project with tight deadlines and high client expectations.
  • Identified bottlenecks, refactored APIs and UI, conducted stress tests, monitored live performance, and led technical workshops.
  • Led creative projects involving blockchain, multimedia streaming, and 3D environments, managing project scoping, estimation, and technology stack selection.
  • Delivered projects successfully, resulting in additional contracts and positive client feedback.
JavaScriptJavaScript
React.jsReact.js
MongoDBMongoDB
DockerDocker
PostgreSQLPostgreSQL
16+
Massive Pixel Creation

Full-Stack Software Engineer / Team Lead

Massive Pixel Creation
Information Technology (IT) and Services
Dec 2019 - Dec 2020 · 1y
  • Delivered projects for diverse clients at a software house, ranging from custom integrations and modifications of existing software to managing the development of entire projects from scratch.
  • Worked on a variety of projects, including custom chat integration with external company software, WordPress and WooCommerce customizations, and finalizing critical features on a coaching platform prior to its official release.
  • Managed the full project lifecycle, from requirements gathering to CI/CD setup.
  • Recruited and mentored developers, and developed a skills roadmap for the team.
PHPPHP
JavaScriptJavaScript
React.jsReact.js
MongoDBMongoDB
DockerDocker
18+
Open Tangerine

Full-Stack Developer

Open Tangerine
Information Technology (IT) and Services
Oct 2016 - Oct 2019 · 3y
  • Worked on existing and prepared new projects from scratch in PHP (CakePHP), React, React Native (Expo)

  • Worked on a mobile game featuring geolocation and a rivalry mechanism in real-world areas.

  • Worked on a data analysis project with a creative interface (draggable windows, terminal-like interface to manage workspaces, interactive graphs with specific data from queries, etc.

PHPPHP
MySQLMySQL
CakePHPCakePHP
JavaScriptJavaScript
React.jsReact.js
21+
Inspire Labs

Full-Stack Developer

Inspire Labs
Information Technology (IT) and Services
Apr 2015 - Nov 2016 · 1y 7m
  • Created website and mail templates.

  • Created templates and plugins for Wordpress and WooCommerce.

  • Created websites/applications from scratch in Zend Framework and Laravel.

  • Various API integration (payment gateways, scraping services, notification services, etc).

PHPPHP
LaravelLaravel
MySQLMySQL
JavaScriptJavaScript
HTMLHTML
11+

Full-Stack Developer

Targi Brno
Information Technology (IT) and Services
Dec 2012 - Dec 2015 · 3y
  • Created web services in the Yii Framework.

  • Integration of services like Facebook, etc.

  • designed SQL schema.

  • Created templates and plugins for WordPress.

  • Various API integration.

PHPPHP
YiiYii
MySQLMySQL
JavaScriptJavaScript
HTMLHTML
9+

Engineering excellence

All Fullstack developers who have applied to Proxify are scored from 0 to 300 on engineering excellence, one of the five parameters we evaluate. This score reflects engineering excellence only, based on interviews, take-home assignments, live coding sessions, and/or on-the-job performance reviews. The curve shows how all evaluated Fullstack developers are distributed across that range, where our acceptance threshold for this parameter sits, and where Michal stands.

050100150200250300Engineering excellence scoreShare of engineersmedianmeanProxifyacceptancethreshold
Michal
Score 202 · Top 6% of engineers

Education

CUO
Czestochowa University of Technology
Computer Science2012 - 2013
CUO
Czestochowa University of Technology
Computer Science2008 - 2012

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