Michał Chudziak

Director of Engineering @ Callstack

Wembley, England, United Kingdom

About

I’m an experienced engineer and technology nerd with over a decade of professional experience building web and mobile applications. Relationships, trust, and excellence are my core values and they serve as the foundation of my work Github: https://github.com/michalchudziak Twitter: https://twitter.com/michalchudziak Medium: https://medium.com/@michalchudziak

Experience

  • Callstack (2 yrs 4 mos)
    • Director of Engineering
      Apr 2024 - Present · 2 yrs 4 mos

      - Fortune 100 technical consulting - Leading a department of ~200 engineers - Shifting engineering org towards agentic development and effective AI usage - Strategic planning and performance management - Technical sales - AI adoption and process optimization - Establishing engineering quality standards and best practices

    • act. Head of Customer Success
      Mar 2026 - Present · 5 mos

      - Full revenue ownership of 150M+ PLN portfolio - Driving 20% YoY revenue growth via upsells, expansions, and renewals - Executive-level relationships with top-tier accounts - Pricing strategy and complex deal negotiation - Key account planning and stakeholder mapping - Leading a team of 3 Account Managers - Sales forecasting, pipeline, and account reporting

    • act. Head of Portfolio Delivery
      Apr 2025 - Present · 1 yr 4 mos

      - End-to-end ownership of 150M+ PLN P&L portfolio - 25%+ margin and YoY revenue expansion - Standardizing delivery frameworks across portfolio - Leading the team of ~20 Portfolio Managers, Project Managers and Business Analysts - C-level stakeholder management and advisory - Portfolio health monitoring - Driving AI-led automation and delivery industrialization

  • React Native Core Open Source Contributor at Open Source
    Jan 2019 - Present · 7 yrs 7 mos

    - Contributing to discussions & proposals around the React Native core - Extracted several modules from React Native Core to external libraries - Maintaining the most popular Geolocation library in React Native (https://github.com/michalchudziak/react-native-geolocation) - Member of React Native New Architecture Working Group

  • Independent Consultant on React Native at michalchudziak.dev
    Jul 2022 - Jun 2024 · 2 yrs

    - Advisory on architecture and development plans of React and React Native apps - Optimizing performance of existing React Native apps - Planning and executing migrations from native to React Native - Creating native SDK wrappers for React Native - Development team augmentation - Support for development team scaling (hiring & personal development)

  • Platform Engineering Consultant at Relive
    Nov 2022 - Jun 2023 · 8 mos

    - Planning and executing mobile application modernization strategies - Reworking and enhancing mobile application architecture - Establishing KPI metrics for performance evaluation - Optimizing performance for improved application efficiency - Managing large-scale mobile infrastructure, accommodating for approximately 15 million active users - Promoting and implementing robust testing methodologies

  • Callstack (6 yrs 5 mos)
    • Head of Delivery
      Jan 2022 - Jul 2022 · 7 mos

      - Scaling up and leading teams of 60 developers, 10 project managers, and 5 QA engineers - Strategic planning & performance management - Technical consulting for key accounts - Professional service delivery management - Delivery process optimization - Establishing quality standards and best practices for development - Pre-sales technical support

    • Head of Technology
      Oct 2019 - Jan 2022 · 2 yrs 4 mos

      - Scaling up and leading the team of 20 - 40 developers - Composing personal development paths for developers - Establishing quality standards and best practices for development - Working on commercial optimization and R&D projects - Architecture design for large-scale React and React Native projects - Managing the hiring of React Native Experts - Pre-sales technical support

    • Lead Software Engineer
      Jan 2017 - Oct 2019 · 2 yrs 10 mos

      - Leading the team of 15 developers - Composing personal development paths for developers - Leading and developing web and mobile projects using React, React Native, JavaScript, and native languages - Designing and developing native SDK wrappers for React Native - Developing tooling around React and React Native using Node.js - Establishing automated release processes for React and React Native - Supporting the recruitment of developers