Daniel Xavier

dxdanielxavier@gmail.com
+55 31 99732-5804
linkedin.com/in/danieljxavier
danielxavier.dev

Summary

Skills

Experience

Technical Lead @ <DanielXavier /> (05-2024 to present)
A contractor role where I have been working on some independent client projects:
- Developed the new Lovevery's checkout (focused on performance improvement and a better user experience), using Next.js + Tailwind CSS + Contentful, supporting 4 countries and 5 languages, and improving the code coverage by more than 20%;
- Created a high-performance and fully accessible professional portfolio website using React/Tailwind CSS to handle routing in the front, Next.js/Node.js to provide Server Side Rendering in the back end, Jest/Cypress to provide 100% code coverage including some visual tests, and Vercel's Frontend Cloud for deployment;
- Made a template-based app for printing medical reports using React to handle the dynamic fields in the front, Next.js/Node.js to provide Server Side Rendering in the back end, and Vercel's Frontend Cloud for deployment;
- Biggest challenge: To quickly design and release projects from scratch and with few defined requirements.
- Main stack: React | Next.js | HTML5 | CSS3 | Tailwind CSS | Node.js | TypeScript | JavaScript | Jest | Cypress | Contentful | Docker | Vercel | MySQL
Technical Lead @ OLX (01-2024 to 04-2024)
A tech leader role (80% people / 20% hands-on) where I was responsible for a core team's results:
- Led a team of 9 developers, engaging them even in a crisis scenario, doing weekly 1:1s, and helping them with their technical challenges;
- Launched the new Ad Insertion journey in stages, giving users a fluid and easier experience to sell items in the classified platform;
- Rewrote the mobile app with native technologies to improve the user experience and reduce the crashes;
- Mentored the team members through their performance cycles with clear and achievable goals for the next year;
- Led the team ceremonies with agile practices to ensure a streamlined workflow improving task throughput by 50%;
- Worked closely with the Product Manager to mitigate risks and make effective product decisions;
- Biggest challenge: To deal with pressure from leadership to do major deliveries in the short term.
- Main stack: React | Node.js | Kong | Amazon Web Services (AWS) | Amazon S3 - Cloud Object Storage | Native Android | Kotlin | Native iOS | SwiftUI | React Native | Firebase
Technical Lead @ OLX (07-2023 to 12-2023)
A double leadership role with a very technical team and a chapter once a week:
- Led a team of 8 developers, leveraging the strengths of each of them, doing weekly 1:1s, and supporting them in the technical decisions;
- Published a new LTR ranking algorithm that brings 10% more conversion in the Ad Recommendation system;
- Structured this team into 3 independent squads to support the strategic plan for next year and get them focused on each business domain;
- Used the OpenAI API to help us in an annotation job with thousands of registries in a simple way and with 60% accuracy;
- Also led a Design System chapter with 9 developers, with a once-a-week work meeting, planning the tasks, and keeping them focused on the most valuable deliveries;
- Launched the Design System v3, bringing 30% more performance to all pages on the platform;
- Biggest challenge: To balance the substantial responsibilities of both the team and the chapter simultaneously.
- Main stack: React | Storybook | Python | Amazon Web Services (AWS) | Amazon S3 - Cloud Object Storage | PostgreSQL | Kotlin | Native iOS | SwiftUI | React Native | Elasticsearh
Technical Lead @ OLX (09-2022 to 06-2023)
A tech leader role (70% people / 30% hands-on) where I was responsible for the Design System project:
- Led a team of 9 developers, influencing technical decisions and creating some automation scripts for data collection;
- Partnered with the Design Manager to make optimal product decisions and define a product roadmap;
- Executed the Design System roadmap, including a new platform home page, created in less than 48 hours;
- Guaranteed the continuous evolution of the Design System and its adoption by other teams in the company;
- Created some processes to contribute to the Design System project, bringing in 10 new external collaborators;
- Biggest challenge: To assume multiple roles simultaneously, including Engineering Manager, Product Manager, Data Analyst, etc.
- Main stack: React | Storybook | Amazon Web Services (AWS) | Amazon S3 - Cloud Object Storage | Native Android | Kotlin | Native iOS | SwiftUI
Technical Lead @ OLX (08-2021 to 08-2022)
A tech leader role (90% people / 10% hands-on) where I was responsible for the Advertising system:
- Led a team of 7 developers, serving as a key reference, doing weekly 1:1s, and helping them interact with other teams;
- Made some advertising improvements to the platform that generated revenue of R$80 million;
- Recruited new professionals to increase production capacity by 300%, and be able to focus on the functionalities of the mobile application;
- Actively partnered with the Product Manager to prioritize and develop promising initiatives;
- Proposed a new structure for the entire Advertising area to enhance our results;
- Biggest challenge: To manage high expectations related to Advertising revenue results.
- Main stack: HTML5 | CSS3 | JavaScript | Amazon Web Services (AWS) | Amazon S3 - Cloud Object Storage | Google Ad Manager | Native Android | Java | Kotlin | Native iOS | SwiftUI | Firebase
CTO & Partner @ Meaning (03-2022 to 05-2023)
I held the position of CTO and co-founder at the startup:
- Crafted the startup's technical vision and product strategy;
- Refined the product's technical specifications;
- Architected the solution from the ground up and we delivered it to 4 new clients;
- Launched the MVP platform;
- Biggest challenge: To find a way to convert a highly "human-centric" project, based on personal consultancy, into a systematic approach.
- Main stack: HTML5 | CSS3 | JavaScript | Google Cloud Platform (GCP) | BPMN
Team Leader @ Softplan (10-2020 to 07-2021)
A multidisciplinary team leader role where I was responsible for the team results:
- Directly led a multidisciplinary software development team of 28 people including Developers, Quality Assurance analysts, Product Owners, Business Analysts, and Agile Masters;
- Made bi-weekly 1:1s to help the devs with the technical challenges, to help the QAs integrate their tasks with the team process flows, avoid creating bottlenecks and develop new automation test approaches, and the PO/BAs to handle the customer's urgent needs;
- Also guided the agile masters to structure and continuously enhance the team's workflow using agile software development methodologies;
- Planned and executed deliveries for the most 2 critical modules of the core system;
- Created formulas and metrics to accurately gauge the team's capacity, and sprint velocity, thereby bringing predictability to deliveries;
- Biggest challenge: To manage such a large team and ensure critical deliveries.
- Main stack: React | Micro Frontends | .NET | GraphQL | Amazon Web Services (AWS) | SQL Server | Delphi
Technical Lead @ Softplan (09-2019 to 10-2020)
A tech leader position (80% tech / 20% people) where I was responsible for the Front-End best practices:
- Developed some Front-End modules for the new core system, constructed using React and a Micro Frontend approach;
- Handled for the code reviews, deliveries, and deployment of 17 modules of the system;
- Formed the Delphi developers team up to work with HTML, CSS, JavaScript, React, GraphQL, and unit tests;
- Led a team of 10 Front-End developers, doing weekly 1:1s, and partnering with their coordinators to do career plans;
- Hired tons of new employees for the company and new contractor professionals aligned with our development culture;
- Biggest challenge: To acquire leadership skills and master people management, balancing with hands-on work.
- Main stack: React | Micro Frontends | .NET | GraphQL | Amazon Web Services (AWS) | SQL Server
Senior Front-End Engineer @ Softplan (12-2018 to 08-2019)
A pure hands-on position where I was responsible for doing all of my team's Front-End deliveries:
- Successful delivered the team's most critical and complex project in less than 6 months, helping the Product Owner improve some features;
- Developed new features for the public portal helping attorneys in their jobs;
- Created new features for the core system helping tons of law professionals in their work;
- Biggest challenge: To manage all project deliveries as a single Front-End developer.
- Main stack: React | Micro Frontends | .NET | GraphQL | Amazon Web Services (AWS) | SQL Server
Senior Full-Stack Engineer @ Hotmart (06-2018 to 11-2018)
A pure hands-on position where I was responsible for doing all of my team's full-stack deliveries:
- Designed and implemented a system to address the company's internal needs and automate tasks, using Vue.js/Nuxt.js for the user interface, Node.js/Express for the data requests, and MySQL for storing data, that brought more than 1000 new leads for the commercial team;
- Created a Proof of Concept (POC) interface, only using JavaScript and HTML, that introduced a very simplified method for product registration on the platform (our main bottleneck);
- Biggest challenge: To balance the need to comprehend customer requirements clearly while simultaneously coding.
- Main stack: HTML5 | CSS3 | Vue.js | Nuxt.js | Node.js | JavaScript | Amazon Web Services (AWS) | MySQL
Mid Level Front-End Engineer @ Hotmart (06-2017 to 05-2018)
A pure hands-on position where I was responsible for doing some of my team's full-stack deliveries:
- Designed from scratch a system to generate blog post images using components and pre-defined templates, using Vue.js/Nuxt.js for the interface, and Node.js for the assets API, thereby enhancing the productivity of the design team by 1000%;
- Created a high-performance caching system for the "Hotmart blog" (WordPress), using only some Nginx configs and PHP hooks, which resulted in a 300% increase in performance;
- Implemented the Arabic version of the "Hotmart blog" using pure CSS;
- Biggest challenge: To design and develop complex solutions from the ground up.
- Main stack: HTML5 | CSS3 | Vue.js | Nuxt.js | Node.js | JavaScript | PHP | WordPress | Nginx | Amazon Web Services (AWS) | MySQL
Entry Level Front-End Engineer @ Hotmart (12-2016 to 05-2017)
I was an Entry Level Front-End developer on the "User Acquisition" team:
- Developed a new WordPress theme for the "Hotmart blog" utilizing only HTML5, CSS Grid Layout, and Vanilla JS;
- Implemented the new layout for the "Hotmart blog";
- Created custom features within the WordPress admin interface;
- Biggest challenge: To acquire new development skills and apply them to complex projects.
- Main stack: HTML5 | CSS3 | JavaScript | PHP | WordPress | Nginx | Amazon Web Services (AWS) | MySQL
Support Analyst @ Sydle (04-2014 to 11-2016)
I was a Support Analyst on the "Suporte & Sustentação" team:
- Spearheaded the development of web projects utilizing WordPress and Magento;
- Facilitated the modeling and automation of the company's internal processes through BPMN;
- Provided comprehensive technical support to users of the company's systems;
- Oversaw the configuration and monitoring of both Linux and Windows servers.
- Biggest challenge: To rapidly acquire development skills and contribute to legacy projects.
- Main stack: HTML5 | CSS3 | Angular | Node.js | Express | LoopBack | JavaScript | PHP | WordPress | Magento | Apache | Linux Servers | Windows Servers | Amazon Web Services (AWS) | MySQL | SQL Server | Oracle | BPMN
Support Associate @ Sydle (04-2012 to 03-2014)
I was a Support Associate on the "Suporte & Sustentação" team:
- Provided technical support to users of the company's systems;
- Configured and monitored infrastructure on Linux and Windows servers;
- Compiled team reports;
- Offered infrastructure support to the company's employees.
- Biggest challenge: To simultaneously learn a multitude of new concepts and balance them with my university commitments.
- Main stack: JavaScript | Linux Servers | Windows Servers | Amazon Web Services (AWS) | SQL Server | Oracle | BPMN
... and other previous roles

Education

Master of Business Administration - MBA, Strategic People Management
Estácio
Bachelor, Computer Science
Universidade FUMEC