Mateusz Kozlowski

Senior Full Stack Engineer at Bosch

Led development of complex React applications using TypeScript focused on long-term maintainability, predictable state management, and performance in enterprise-scale environments. Maintained and evolved a shared frontend architecture integrated with backend services on Kubernetes-based infrastructure. Translated UX flows from Figma into reusable, accessible UI components aligned with internal design standards. Contributed to frontend platform decisions, integrated REST APIs, and collaborated with backend engineers on service contracts. Participated in code reviews and architectural discussions, promoting pragmatic solutions. Gained hands-on exposure to Kubernetes concepts and cloud deployment workflows; supported production stability with DevOps and observability tooling.

Full Stack Engineer at Hotjar by Contentsquare

Product-focused role building user-facing analytics features in a fast-growing SaaS environment. Developed and maintained React and TypeScript frontend features used daily by thousands of customers. Contributed to a custom design system, ensuring visual consistency and usability across the product. Collaborated with product managers and designers to iterate quickly on user feedback and experiment-driven development. Improved frontend performance and reliability through targeted refactoring and incremental architectural improvements. Integrated frontend applications with RESTful APIs and backend services in a cloud-native environment. Worked within a CI/CD pipeline, contributing to smooth, frequent deployments with minimal disruption. Participated in cross-team knowledge sharing, code reviews, and frontend best-practice discussions.

Full Stack Engineer at Criteo

Worked on high-traffic advertising and analytics platforms with strong performance and scalability requirements. Built and maintained React-based frontend applications handling large volumes of real-time data. Used TypeScript to improve code safety and readability across a growing frontend codebase. Collaborated with backend and data teams to integrate complex APIs and ensure correct data representation in UI layers. Contributed to internal UI libraries and shared components to reduce duplication across teams. Worked within mature CI/CD pipelines and Git-based workflows supporting frequent releases. Assisted in frontend performance tuning and monitoring in production environments. Participated in design reviews and technical discussions across distributed, international teams. Gained broader understanding of infrastructure and deployment constraints impacting frontend behavior.

Backend Engineer at Alior Bank SA

Backend services supporting banking and internal operational systems. Collaborated with frontend teams to define and evolve REST API contracts. Worked with relational databases, focusing on data integrity, migrations, and reporting queries. Supported production systems where stability and auditability were critical. Participated in code reviews and internal quality initiatives. Gained experience working within strict compliance and security constraints. Assisted with gradual modernization of legacy systems. Built a strong foundation in system design and backend reliability principles.