Daniel Fijołek

• Spearheaded the end-to-end frontend architecture and development of a greenfield SaaS application using Next.js, strategically selected for SEO and to serve as a secure validation layer between the client and backend, enhancing data integrity and application security. • Architected and implemented a robust, custom authentication system with optimized token caching and refresh logic, minimizing unnecessary backend calls while ensuring persistent user security. Routed all API calls through Next.js to protect backend endpoints and sensitive keys. • Engineered a custom i18n solution from scratch for 5 languages, featuring type-safe JSON dictionaries and a synchronization script, providing full control over the translation workflow and ensuring maintainability as the application scales. • Introduced an "action wrapper" for server-side logic that standardized error handling, authentication checks, and data validation, reducing boilerplate code by 20-40 lines per action and accelerating the development of new features. • Onboarded and mentored interns through guided tasks and rigorous code reviews focused on code quality, readability, and adherence to established architectural patterns (Zustand, TanStack Query), fostering their growth into effective contributors. • Delivered critical features, including a collaborative dashboard with Translyte integration - the company’s first paid feature that played a key role in securing investor funding by demonstrating market viability and technical execution.

• Developed web application for international cyber security client, specializing in SIEM systems. • Collaborated with cross-functional team to create intuitive and responsive user interfaces using React, Redux, and Material UI. • Actively participated in Scrum team environment, engaging in daily stand-ups, sprint planning, and retrospectives. • Contributed to development and maintenance of project focused on log searching and aggregation for threat detection and analysis. • Identified and resolved client-side bugs, enhancing overall user experience and application performance. • Implemented comprehensive unit tests with JEST to ensure code quality and reliability. • Refactored legacy React components into functional components, improving code maintainability and performance.

• Developed a responsive website from scratch using HTML, CSS, and React, showcasing strong web development and design skills • Upgraded the website to utilize CSS Modules for efficient style management and implemented unit testing with JEST • Completed professional courses in TypeScript, Node.js, and Express, demonstrating a commitment to continuous learning and growth • Achieved AWS Participation certification, showcasing knowledge and proficiency in cloud computing • Collaborated closely with a team of five to develop a complex React application utilizing Redux and TailwindCSS • Facilitated a smooth transition of the React application to Angular, ensuring a seamless user experience during the framework migration

• Contributed significantly to web development and virtual tour creation, enhancing digital experiences for clients and municipalities • Developed panoramic maps and virtual tours for home developers, effectively showcasing properties and improving online presence • Designed and customized WordPress websites based on client preferences and needs • Collaborated on projects to create informative virtual guides for municipalities and cities, providing valuable information to residents and tourists.