I’m Gesiel Souza Oliveira, an Angular front-end developer focused on building scalable, accessible, high-performance interfaces with a strong product and data mindset. I enjoy turning design and business needs into reusable Angular components, solid architecture, and clean user experiences that work smoothly across devices. Beyond UI development, I bring hands-on digital analytics experience—using GA4, GTM, dataLayer, and data QA practices to ensure tracking is consistent and reliable. This combination helps me deliver front-end work that not only feels great for users, but also produces trustworthy measurement data for teams to make better decisions.…

Gesiel Souza Oliveira

I’m Gesiel Souza Oliveira, an Angular front-end developer focused on building scalable, accessible, high-performance interfaces with a strong product and data mindset. I enjoy turning design and business needs into reusable Angular components, solid architecture, and clean user experiences that work smoothly across devices. Beyond UI development, I bring hands-on digital analytics experience—using GA4, GTM, dataLayer, and data QA practices to ensure tracking is consistent and reliable. This combination helps me deliver front-end work that not only feels great for users, but also produces trustworthy measurement data for teams to make better decisions.…

Available to hire

I’m Gesiel Souza Oliveira, an Angular front-end developer focused on building scalable, accessible, high-performance interfaces with a strong product and data mindset. I enjoy turning design and business needs into reusable Angular components, solid architecture, and clean user experiences that work smoothly across devices.

Beyond UI development, I bring hands-on digital analytics experience—using GA4, GTM, dataLayer, and data QA practices to ensure tracking is consistent and reliable. This combination helps me deliver front-end work that not only feels great for users, but also produces trustworthy measurement data for teams to make better decisions.

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Skills

Experience Level

AngularJS
Expert
TypeScript
Expert
JavaScript
Expert
HTML5
Expert
GA4
Expert
API
Expert
GitHub
Expert
CSS
Expert
Web Design
Expert
UI
Expert
Bootstrap
Expert
Data Visualization
Expert
Google Ads
Expert
SEO
Expert
PostgreSQL
Expert
Facebook Ads
Expert
Node.js
Expert
Docker
Expert
MySQL
Intermediate
Java
Intermediate
SEO Copywriting
Intermediate
SQL
Intermediate
Azure
Intermediate
Data Science
Intermediate
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Language

English
Fluent
Portuguese
Fluent

Work Experience

Web Analytics / Project Lead Analytics at Analytics Consulting
September 1, 2024 - December 1, 2025
Led analytics delivery by translating business goals into technical tracking specifications, event architecture, and user journey mapping. Implemented and standardized Google Tag Manager and GA4 custom events, variables, and parameters following scalable practices. Designed and maintained a consistent dataLayer architecture and performed technical QA of tag firing and payloads. Implemented server-side Meta Conversions API (CAPI) conversion event architecture, including payload structuring, user identification, and deduplication to improve measurement reliability. Integrated multiple media and MarTech platforms (Google Ads, Meta Ads, TikTok Ads, LinkedIn Ads, RTM, Insider) and produced reusable documentation such as event taxonomies, naming conventions, mapping, and QA checklists while collaborating with agile teams across Product, Engineering, and Marketing.
Systems Developer (Front-End Angular) at Linx
September 1, 2021 - April 1, 2024
Developed web applications with Angular, from feature planning to final deployment. Built reusable and scalable front-end components to improve maintainability and reduce development time. Partnered closely with designers to deliver intuitive and accessible UIs, increasing usability and reducing support requests. Supported clients by analyzing issues, proposing solutions, and delivering updates with fast turnaround.
Web Analyst at PUCRS
April 1, 2013 - May 1, 2019
Developed landing pages and analyzed metrics for strategic decision-making. Focused on responsive email marketing and supported stakeholder communication.
Commercial Manager at Grupo Potencial
December 1, 2012 - April 1, 2013
Managed branch operations with a focus on team coordination and performance indicators, primarily for customer retention.
Business Manager at Banco Cacique
November 1, 2005 - March 1, 2010
Responsible for branch revenue and team management, with a focus on credit analysis and economic-financial information.

Education

Bachelor's in Business Administration at IPA
February 1, 2017 - December 1, 2020
Full Stack Development — Postgraduate degree at Centro Universitário União das Américas
January 11, 2030 - December 1, 2026

Qualifications

Add your qualifications or awards here.

Industry Experience

Professional Services, Software & Internet, Media & Entertainment, Education, Computers & Electronics
    https://www.igrejadecristo.net.br
    Igreja de Cristo — Responsive Website | HTML5, CSS3 & Bootstrap Designed and developed a complete responsive, mobile-first church website using HTML5, CSS3, Bootstrap 5.3.8 and Bootstrap Icons, with a strong focus on pixel-perfect implementation, usability, accessibility, technical SEO and web performance. Lighthouse Results Performance: 98/100 Accessibility: 94/100 Best Practices: 100/100 SEO: 100/100 Project Highlights Pixel-perfect and responsive UI implementation across desktop, tablet and mobile breakpoints Mobile-first architecture built with Bootstrap 5.3.8 and custom CSS Semantic HTML5 structure using meaningful landmarks such as header, nav, main, section, article, figure and footer Technical SEO implementation with unique page titles, meta descriptions, canonical URLs, robots directives and Open Graph/Twitter metadata Schema.org structured data using JSON-LD XML sitemap and robots.txt configuration to support search-engine crawling and indexing Accessibility-focused implementation with semantic controls, ARIA labels, descriptive image alternative text and keyboard-friendly interactions Responsive navigation and interactive components using Bootstrap Accessible photo gallery/lightbox with keyboard navigation Image optimization using explicit dimensions, lazy loading, asynchronous decoding and prioritized loading for critical imagery Clear information architecture covering churches, events, community information, gallery and contact/visit information Custom CSS layered over Bootstrap to create a consistent visual identity while maintaining responsive behavior Front-end implementation focused on usability, maintainability, accessibility and performance rather than visual presentation alone Technical Stack HTML5 · CSS3 · Bootstrap 5.3.8 · Bootstrap Icons · JavaScript · Responsive Web Design · Mobile-First · Technical SEO · Schema.org · JSON-LD · Accessibility · ARIA · Performance Optimization This project demonstrates the ability to build production-oriented responsive websites with a strong balance between visual fidelity, user experience, accessibility, search-engine optimization and technical performance.…
    https://www.gesieloliveira.com.br
    One of the projects I developed recently is my own online resume, which I built as a full-stack web application. On the frontend, I used Angular 20 and TypeScript, following a component-based architecture. I implemented Angular Router, HttpClient with Fetch, RxJS, Forms, and Angular SSR/SSG with client-side hydration. I also added internationalization using ngx-translate, so the application supports Portuguese, English, and Spanish. For the backend, I developed a REST API using Node.js and Express. I separated the API into different resources, such as professional experience, education, languages, categories, and skills. The API also handles the requested language and returns the appropriate localized content to the frontend. For data persistence, I used PostgreSQL. I worked with the PostgreSQL driver and connection pooling, and I also integrated Supabase for some parts of the data access layer. I wrote SQL queries using JOINs, GROUP BY, ORDER BY, and PostgreSQL JSON functions such as json_agg and json_build_object to organize related data before returning it through the API. I also implemented environment variables for configuration and sensitive credentials, CORS configuration, and cache-control policies for API responses. The main goal of the project was not only to create an online resume, but to build a real-world application where I could practice and demonstrate frontend, backend, database, API integration, internationalization, and server-side rendering skills in a single project.…