Sergio Ballestero

Frontend developer @Localhost

Computer engineer🧑‍🔬 Engineer

With over 12 years of extensive experience in web development, I bring seasoned expertise to software development projects. Proficient in JavaScript and PHP, I navigate all facets of the development lifecycle with ease, from conceptualization to deployment. Skills Highlights: - Expertise in HTML, MySQL, CSS, and GIT with over a decade of hands-on experience in each. - Proficient in Angular, React, and NextJS, amplifying web application functionality. - Strong command over PostgreSQL for robust database management. - Versatile in Web/UI Design and adept in WordPress for dynamic content management. - Advanced proficiency in Photoshop and Illustrator, coupled with adeptness in Figma for streamlined design workflows. - Competent in NodeJS and Tailwind CSS for scalable server-side and frontend solutions. - Experience in unit testing with Jest and PHPUnit to ensure code reliability and maintainability. Driven by a passion for forging new connections and fostering collaborative environments, I eagerly seek remote employment opportunities to contribute to impactful projects. Let's connect and explore avenues for mutual success.

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Work Background

number8Full Stack Engineer

Jun. 2022 - Mar. 2023United StatesClient: Multiple Clients in the United States Technology Stack: HTML, JavaScript, CSS, Figma, GIT, React, Scrum Methodologies, Jira, GitHub, Design Systems, Okta Workflows Integrations, NextJS, WordPress, Python Project Description I developed a web application for a US-based company that offered end-to-end scholarship and grant management software, connecting sponsors with applicants. Throughout the project, I ensured that tasks were completed efficiently and tracked using JIRA. To develop the application, I created high-quality, responsive components based on design wireframes, consuming API services to feed those components. I also ensured that the repository was clean and well-organized by creating branch-per-feature and reviewing team code. To ensure that the application was of the highest quality, I analyzed use cases and developed a test-driven approach that allowed me to identify and address issues before they impacted the user experience.

Rockstar CodersSenior Software Engineer

Jan. 2021 - Jun. 2022United StatesClient: Multiple Clients in the United States Technology Stack: HTML, JavaScript, CSS, Figma, AngularJS, Angular+2, GIT, SCSS, Docker, React, Scrum Methodologies, Jira, GitHub, Design Systems, Python Project Description: I developed a web application for a US-based company that allowed clients to manage every aspect of their wedding planning, from guest lists to invitations. In this role, I was responsible for completing tasks tracked by JIRA and ensuring a clean repository by creating branch-per-feature and reviewing team code. Using design wireframes as a guide, I created high-quality, responsive components for the application, consuming API services to feed those components. I also analyzed use cases to ensure a high-quality and effective solution, coding multiple projects within a single repository. To ensure that the application was of the highest quality, I used a test-driven development approach, which allowed me to identify and address issues before they impacted the user experience.

Global Tracking ParaguayFull Stack Developer

Jan. 2016 - Jan. 2021Asunción, ParaguayClient: GTP Technology Stack HTML, PHP/Laravel, JavaScript, MYSQL, CSS, Photoshop, Illustrator, Figma, AdobeXD, WordPress, Ionic, Angular+2, GIT, SCSS, Docker, React, NodeJS, Python, PHP, UI / Web Design, Gitlab Project Description I was responsible for the successful development of a GPS tracking system web application for a large vehicle fleet. This application, which has been used over 1,000,000 times and receives messages from more than 2000 vehicles every 15 seconds, was a critical tool for tracking the position and events of vehicles on the road. In this project, I managed the back-end development of the application, as well as some server configuration and mail configuration using technologies such as PHP and NodeJS. I ensured that the application was scalable and could handle the large volume of data generated by the fleet. In addition to my work on the GPS tracking system, I also created themes for WordPress from scratch. Using my design skills and expertise in web development, I was able to create themes that were both visually appealing and functional, providing clients with a high-quality user experience. Overall, my contributions to these projects demonstrate my ability to handle complex development tasks, manage server configurations, and create visually stunning and functional themes for WordPress.

PuntopyDesign Manager

Jun. 2007 - Apr. 2016Asunción ParaguayClient: Multiple Clients. Technology Stack: HTML, PHP, JavaScript, MYSQL, CSS, SCSS, Photoshop, Illustrator, WordPress, Ionic, Angular, Drupal, GIT, Scrum Methodologies, Gitlab, UI / Web / App Design Project Description: As a collaborative team member, I played a key role in developing and maintaining a range of successful web applications and campaigns for major companies including Unilever, Miller Genuine Draft, and Tigo. My workflow was tracked using Gitlab, and I ensured that our repository remained clean and organized by creating a branch-per-feature. In addition to my technical skills, I contributed to the team's success by bringing a positive attitude and a strong work ethic to every project. I was involved in all stages of the creative process, from conceptualization to execution, and I assisted with a variety of design projects. With my help, our team consistently met tight deadlines and delivered high-quality work. My expertise extends beyond web development, and I have experience working with various technologies including websites, apps, and touch panels for shopping malls. Through my contributions, I helped to create engaging and successful digital experiences for our clients.

Tigo ~ Telefonica Celular del Paraguay S.A.Wireless Engineer

Apr. 2006 - Feb. 2007Asunción, ParaguayClient: Tigo Systems Technology Stack: HTML, PHP, JavaScript, ORACLE, CSS, Photoshop, Illustrator Project Description: As an Office Administrator at Tigo, a global telecommunications company specializing in internet, phone calls, and IT services, my role was crucial in ensuring the smooth and efficient operation of the office. Working in a fast-paced environment, I was responsible for a wide range of administrative tasks, including managing schedules, organizing meetings, and maintaining records. In addition to my office duties, I also played a key role in maintaining Tigo's reputation for high-quality customer service. As part of this effort, I regularly visited clients to check their WiFi installations and ensure that they were receiving optimal service. Through these visits, I was able to establish strong relationships with clients and address any issues they may have had in a timely and effective manner. Overall, my contributions as an Office Administrator at Tigo helped to ensure the company's success and reputation for excellence in both customer service and office management.

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