Jeison Alexander Fox Perez

Senior Full Stack Engineer

Red Thread Innovations

Jul 2025 - Current (1 year 4 months)

∙ Build modern, scalable UI features by translating Figma designs into reusable React components, contributing to a consistent and maintainable design system. ∙ Deliver both small bug fixes and large, end-to-end feature implementations while helping migrate the legacy Angular application into a modern React codebase. ∙ Write thorough unit, integration, and end-to-end tests for new and migrated components, ensuring reliability and preventing regressions. ∙ Collaborate closely with product managers, designers, and engineers, participating in planning, estimations, feature discussions, and performing code reviews to maintain high code quality. ∙ Contribute occasionally to the Java backend (REST APIs, small features, and fixes), supporting full

Tech Lead / Senior Fullstack Engineer

Dom & Tom

Jan 2025 - Jul 2025 (7 months)

∙ Drive development of commercial websites built using different technologies, like Gatsby or Next.js (TypeScript), optimizing for performance, accessibility, and SEO. ∙ Architect and build complex web applications using React and TypeScript, creating reusable component libraries and robust state-management solutions. ∙ Mentor and coach mid-level and junior developers through code reviews and pair programming, ∙ Integrate Node.js backend services and APIs, collaborating with backend teams on data flow, authentication, and deployment workflows.

Senior Frontend Engineer

Pontoro

Mar 2024 - Dec 2024 (10 months)

• Contributed to developing the MVP of a fintech application to secure new funding by creating reusable React components and integrating them with RESTful APIs.
• Architected the frontend alongside a senior frontend engineer, guiding tech-stack and design-pattern decisions through requirements analysis and iterative discussions.
• Audited and migrated two custom component libraries (“Planar Portal” and “Frontend Common”), developing and executing a plan to deprecate the outdated “Frontend Common” and consolidate components into “Planar Portal.”
• Helped update the corporate website by creating and refining React components to improve functionality and maintain a consistent UI.

Senior Frontend Engineer

Firstleaf

Sep 2023 - Jan 2025 (1 year 5 months)

∙ Collaborated on the development and maintenance of custom React components and frontend logic for quiz and checkout sections, leveraging React, JavaScript, CSS (SASS), and HTML to elevate successful checkout rates by up to 15%. ∙ Worked collaboratively on the development of significant improvements to quiz UI and underlying logic, simplifying the user journey and increasing completion rates by 10% to 25%, while making it easier for users to finish the quiz or take it at least partially. ∙ Executed multiple Amplitude experiments to explore new approaches for enhancing quiz and checkout experiences, resulting in a 5%-15% surge in successful checkouts through data-driven enhancements. ∙ Implemented impactful logged-out homepage campaigns tha

Senior Frontend Engineer

Evolving Web

Apr 2021 - Apr 2023 (2 years 1 month)

∙ Mastered the development and maintenance of custom Drupal themes using HTML, CSS, JavaScript, and PHP, resulting in website performance improvements ranging from 10% to an exceptional 60% in some cases. ∙ Engineered and optimized responsive layouts for various screen sizes and devices, resulting in a user engagement boost across mobile platforms, varying from 20% to 50% in some instances. ∙ Conducted rigorous cross-browser compatibility and accessibility compliance tests, ensuring seamless user experience and reducing client-reported issues by 40%. ∙ Seamlessly integrated third-party modules and plugins into websites, enhancing site functionality and leading to an increase in user sessions.

Senior Full Stack Web Engineer

Independent

Jan 2014 - Current (12 years 10 months)

∙ Spearheaded client consultations to decipher project requirements and crafted tailored solutions, boosting client satisfaction. ∙ Championed responsive front-end development using Javascript, React, Typescript, HTML and CSS, enhancing user experience and increasing site traffic by 20% in some cases. ∙ Designed, implemented, and maintained robust backend using Laravel, PHP, and MySQL establishing a solid foundation for application functionality. ∙ Pioneered a cross-platform mobile application utilizing Flutter, available on both iOS and Android platforms, achieving an average rating of 5 on Google Play Store.

Tech Lead / Senior Frontend Engineer

Dom & Tom

Jan 2014 - Mar 2021 (7 years 3 months)

∙ Meticulously analyzed project requirements to fully understand the scope of work, enabling accurate task prioritization and reducing project delivery times by up to two weeks. ∙ In selected projects, spearheaded the frontend development team, providing technical mentorship to colleagues, and fostering a 10% improvement in team productivity. ∙ Engineered and maintained scalable, reusable React components utilizing JavaScript, HTML, and CSS, which contributed up to a 40% reduction in redundant code. ∙ Implemented stringent code quality, performance, and maintainability best practices including unit testing, linting, and code reviews, improving overall code quality. ∙ Harmonized frontend and backend services by effectively working with APIs,

Senior Full Stack Web Engineer

Jobsity

Jan 2014 - Apr 2017 (3 years 4 months)

∙ Engineered efficient, testable, and robust software by adhering to best practices, reducing debugging time by 20% and boosting the quality of delivered code. ∙ Transformed UI/UX wireframes into fully functional, HTML5/CSS3 compliant layouts, achieving seamless visual-to-code translation and enhancing user experience. ∙ Assured the technical feasibility of UI/UX designs, and spearheaded the development of innovative user-facing features, leading to a 35% increase in user engagement in some cases. ∙ Orchestrated seamless data exchange between the server and users, and developed server-side logic, resulting in an overall improvement in site responsiveness. ∙ Fortified application security and data protection, while maintaining comprehensive

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Mid-Level Full Stack Engineer

Jan 2011 - Dec 2013 (3 years)

∙ Authored and refined efficient, testable PHP code, adhering to industry-leading development practices, resulting in an increase in application performance. ∙ Transformed UI/UX wireframes into HTML5/CSS3 code, producing user interfaces that accurately mirrored the original visual design. ∙ Validated the technical feasibility of UI/UX designs, mitigating potential usability issues by 40% in some scenarios. ∙ Collaborated with web designers to realize visual design intents, enhancing the website's aesthetic appeal and functionality. ∙ Developed server-side logic and managed database definitions and maintenance.

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Web Developer

ICS Group, Inc.

Feb 2010 - Aug 2010 (7 months)

∙ Designed and implemented the company's website using a customized Drupal 7 theme, resulting in a 60% increase in site traffic. ∙ Conceived and built a PHP-based internal web application using HTML, CSS, and JavaScript (jQuery), doubling the operational efficiency. ∙ Ensured secure and seamless data operations by managing a MySQL database and enforcing stringent web security standards.

Jeison Alexander Fox Perez

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Jeison Alexander Fox Perez

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