Tomasz Kowalski | Senior Front End Developer at Salesforce

Summary

Experienced Front End Developer with 6 years of expertise specializing in building dynamic and responsive user interfaces using React, JavaScript, and modern CSS frameworks. Proven ability to translate complex design mockups into high-performance web applications, improving user engagement and operational efficiency. Adept at collaborating with cross-functional teams to deliver scalable and maintainable front-end solutions that drive business value and enhance the user experience.

Experience

Senior Front End DeveloperSalesforce

San Francisco, CAJul 2020Present

Led the development of a new React-based customer dashboard, increasing user engagement by 25% and reducing load times by 30%
Implemented a component library using Storybook and Styled-Components, improving developer efficiency by 15% across 3 feature teams
Collaborated with backend engineers to integrate GraphQL APIs, supporting over 100,000 daily active users with seamless data fetching
Mentored 2 junior developers, guiding them through complex features and code reviews, contributing to a 20% reduction in bug reports from new features

Front End DeveloperStripe

San Francisco, CAJun 2018Jun 2020

Developed responsive UI components for the payment processing platform using React and Redux, handling over $1M in daily transactions
Optimized existing codebase, resulting in a 10% improvement in page rendering performance and a 5% reduction in bounce rates
Contributed to the design and implementation of A/B tests for new features, leading to a 7% increase in conversion rates
Collaborated with a team of 5 engineers to deliver critical updates under tight deadlines for major product launches

Projects

E-commerce Platform Redesign

Mar 2022Jan 2023

Led a personal project to redesign and implement a modern e-commerce platform using Next.js and Tailwind CSS, focusing on performance and SEO.
Integrated Stripe API for secure payment processing and developed a custom cart management system, improving user flow by 15%.
Achieved a perfect Lighthouse score for performance and accessibility, demonstrating strong optimization skills.

Real-time Chat Application

Jun 2021Nov 2021

Developed a real-time chat application using React, Node.js, and WebSockets, supporting multiple chat rooms and direct messaging.
Implemented user authentication and message persistence, ensuring a robust and secure communication experience.
Optimized frontend rendering to handle concurrent messages from over 100 simulated users without performance degradation.

Education

University of California, BerkeleyBachelor of Science in Computer Science

Berkeley, CASep 2014May 2018

Graduated with High Honors, GPA: 3.8/4.0
Completed coursework in Data Structures, Algorithms, Web Development, and Human-Computer Interaction
Member of the ACM Student Chapter, actively participated in coding competitions

Skills

Languages

JavaScript (ES6+)TypeScriptHTML5CSS3Python (Basic)

Frameworks & Libraries

React.jsReduxNext.jsNode.jsjQueryMaterial-UI

Tools & Technologies

GitWebpackBabelNPM/YarnVS CodeDocker (Basic)

Testing

JestReact Testing LibraryCypressEnzyme

Methodologies

Agile/ScrumResponsive DesignCross-Browser CompatibilityUI/UX Principles