Rafael Da Silva Email & Phone Number

Av. Chedid Jafet, 75 - Torre Sul - Vila Olímpia, São Paulo - Sp, 04551-065

The main stacks used include .𝗡𝗘𝗧 𝗖#, 𝗔𝗦𝗣.𝗡𝗘𝗧, 𝗞𝗮𝗳𝗸𝗮, 𝗦𝗤𝗟 𝗦𝗲𝗿𝘃𝗲𝗿, 𝗗𝗼𝗰𝗸𝗲𝗿, 𝗞𝘂𝗯𝗲𝗿𝗻𝗲𝘁𝗲𝘀, 𝗣𝘆𝘁𝗵𝗼𝗻, 𝗖++, 𝗔𝘇𝘂𝗿𝗲, 𝗮𝗻𝗱 𝗔𝘇𝘂𝗿𝗲 𝗣𝗶𝗽𝗲𝗹𝗶𝗻𝗲 (𝗖𝗜/𝗖𝗗), Dynatrace.I am part of the order routing squad for B3 (the Brazilian Stock Exchange), where I work on developing new features for the OMS (Order Management System) and Order Authorization systems, as well as creating microservices to support the journey of orders to B3. These systems handle over 3 million orders daily for the brands XP, Rico, and Clear. Although most development is done in .NET C#, we leverage additional technologies as needed.Developers are responsible for the entire development pipeline, including 𝗶𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻, 𝘂𝗻𝗶𝘁 𝘁𝗲𝘀𝘁𝗶𝗻𝗴, 𝗶𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 𝘁𝗲𝘀𝘁𝗶𝗻𝗴, 𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻𝗮𝗹 𝘁𝗲𝘀𝘁𝗶𝗻𝗴, 𝗹𝗼𝗮𝗱 𝘁𝗲𝘀𝘁𝗶𝗻𝗴, 𝗿𝗲𝗴𝗿𝗲𝘀𝘀𝗶𝗼𝗻 𝘁𝗲𝘀𝘁𝗶𝗻𝗴, and deployment to staging and production environments.The two most challenging projects I worked on at XP were the Open Orders Service and the Order Integrator. In the first, I refactored a service that receives order status information via 𝗞𝗮𝗳𝗸𝗮 and publishes it to a 𝗥𝗲𝗱𝗶𝘀 database for the Zeragem Bot. Initially, it processed around 10,000 operations per second; after refactoring, it could process 40,000 operations per second, allowing the bot to access data nearly in real-time.The second project, which I developed almost independently, was the Order Integrator. This service receives events (new orders, changes, cancellations, etc.) via 𝗞𝗮𝗳𝗸𝗮 and reconstructs the final order state in the 𝗦𝗤𝗟 𝗦𝗲𝗿𝘃𝗲𝗿 database. Since its deployment, the project has required only two corrections, highlighting its robustness.The primary challenge in working at a brokerage firm is not only handling the technology and large data volumes but also understanding the business to ensure that solutions meet the strategic needs of the financial sector.

Florianópolis, Santa Catarina, Brazil

Stacks used were 𝗡𝗼𝗱𝗲.𝗷𝘀, 𝗥𝗲𝗮𝗰𝘁, 𝗣𝗼𝘀𝘁𝗴𝗿𝗲𝘀, 𝗗𝗼𝗰𝗸𝗲𝗿, 𝗞𝘂𝗯𝗲𝗿𝗻𝗲𝘁𝗲𝘀, and 𝗔𝗪𝗦 (EC2, SES, SQS, Lambda, EKS).At Nextar was intense, enriching, and challenging. I had the freedom to build new systems from scratch, using 𝗔𝗪𝗦 as infrastructure. The main challenge was to develop a BackOffice system based on microservices, isolating business contexts while transforming a monolithic PHP system. My team consisted of myself and two other developers. As the senior member, I assumed leadership responsibilities, guiding the team to achieve company goals, making technical decisions, defining architecture, as well as mentoring, providing feedback, conducting code reviews, and planning, always aligned with the Product Owner.Among the products developed, a 𝘱𝘢𝘺𝘮𝘦𝘯𝘵 𝘨𝘢𝘵𝘦𝘸𝘢𝘺 stands out, created to simplify integration with various payment methods. Instead of each system building its own integration, all systems used our gateway, specifying only the desired provider. The gateway was built in 𝗡𝗼𝗱𝗲.𝗷𝘀 with 𝗡𝗲𝘀𝘁𝗝𝗦 and 𝗣𝗼𝘀𝘁𝗴𝗿𝗲𝘀, integrating with 𝘝𝘪𝘯𝘥𝘪, 𝘗𝘢𝘺𝘗𝘢𝘭, 𝘌𝘣𝘢𝘯𝘹, 𝘢𝘯𝘥 𝘚𝘵𝘳𝘪𝘱𝘦. Another product was the 𝘚𝘶𝘣𝘴𝘤𝘳𝘪𝘱𝘵𝘪𝘰𝘯 𝘚𝘦𝘳𝘷𝘪𝘤𝘦, which managed subscriptions, processed payments, and notified customers about renewals and monthly charges, also developed in 𝗡𝗼𝗱𝗲.𝗷𝘀 with 𝗡𝗲𝘀𝘁𝗝𝗦.We used 𝗔𝗪𝗦 𝗦𝗤𝗦 for internal communication, enabling fully asynchronous processes without bottlenecks and allowing reprocessing in case of errors. Additionally, we developed a BFF (Backend for Frontend) to manage the virtual store’s behavior, integrating data from new systems. The API was built with 𝗡𝗼𝗱𝗲.𝗷𝘀/𝗡𝗲𝘀𝘁𝗝𝗦, and the front end was developed using 𝗥𝗲𝗮𝗰𝘁 and 𝗡𝗲𝘅𝘁.𝗷𝘀.I also performed 𝗗𝗲𝘃𝗢𝗽𝘀 tasks, including 𝗖𝗜/𝗖𝗗 pipelines with 𝗚𝗶𝘁𝗛𝘂𝗯 𝗔𝗰𝘁𝗶𝗼𝗻𝘀 and the creation and deployment of services on 𝗔𝗪𝗦 𝗘𝗞𝗦, using 𝗞𝘂𝗯𝗲𝗿𝗻𝗲𝘁𝗲𝘀 and 𝗛𝗲𝗹𝗺.

Remote

The main stacks I used during this period were: 𝗖# 𝗔𝘀𝗽.𝗡𝗲𝘁, 𝗣𝗼𝘀𝘁𝗴𝗿𝗲𝘀, 𝗗𝗼𝗰𝗸𝗲𝗿, 𝗔𝗪𝗦 (𝗘𝗖𝟮, 𝗦𝗘𝗦), 𝗥𝗮𝗯𝗯𝗶𝘁𝗠𝗤, 𝗩𝘂𝗲𝗝𝗦, 𝗔𝗻𝗴𝘂𝗹𝗮𝗿, and 𝗙𝗹𝘂𝘁𝘁𝗲𝗿.I worked on three distinct projects.In the first project, I worked independently as a 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗮𝗻𝗱 𝗠𝗼𝗯𝗶𝗹𝗲 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 for 𝘎𝘙𝘚-𝘛𝘐, developing a delivery system for bars and restaurants. I created three systems from scratch: an e-commerce platform for displaying products and receiving orders, a back office for restaurants to manage these orders, and a Flutter app for iOS and Android that aggregated all restaurants within a specific area. The e-commerce platform was built using 𝗩𝘂𝗲.𝗷𝘀, and the backend was developed in 𝗖# .𝗡𝗘𝗧 𝗪𝗲𝗯 𝗔𝗣𝗜.In the second project, I collaborated with 𝘜𝘝 𝘍𝘳𝘢𝘯𝘤𝘩𝘪𝘴𝘪𝘯𝘨 on an e-commerce platform for 𝘏𝘢𝘷𝘢𝘪𝘢𝘯𝘢𝘴 franchise stores, integrating the inventories of over 500 stores in near real-time. The integration connected the e-commerce platform to the store checkout system, allowing stock updates to be sent to the e-commerce platform and orders to be downloaded to each store’s pre-sale system, streamlining sales and invoice issuance. I used 𝗥𝗮𝗯𝗯𝗶𝘁𝗠𝗤 for messaging, 𝗘𝗖𝟮 servers on 𝗔𝗪𝗦, and developed the integrators in 𝗖# .𝗡𝗘𝗧 𝗖𝗼𝗿𝗲.The third project was a customizable dashboard system for indicators, developed for Elevor. I built the frontend in 𝗔𝗻𝗴𝘂𝗹𝗮𝗿, the backend in 𝗖# 𝗪𝗲𝗯 𝗔𝗣𝗜, and used 𝗣𝗼𝘀𝘁𝗴𝗿𝗲𝗦𝗤𝗟 as the database. The system allowed users to create custom dashboards and indicators using SQL queries, CSV files, and JSON files. I also added functionality to configure programmable actions, such as data extraction and sending notifications via email or Telegram.These projects also enhanced my 𝘀𝗼𝗳𝘁 𝘀𝗸𝗶𝗹𝗹𝘀, as I had direct contact with the product owners, providing valuable experience in communication and collaboration with stakeholders.

Guaporé, Rio Grande Do Sul, Brazil

During my time at Acmix, I developed a system for stores and grocery storesusing 𝗖# 𝘄𝗶𝘁𝗵 .𝗡𝗘𝗧 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸 and 𝗪𝗶𝗻𝗱𝗼𝘄𝘀 𝗙𝗼𝗿𝗺𝘀 for the 𝘗𝘖𝘚 and 𝘉𝘢𝘤𝘬𝘖𝘧𝘧𝘪𝘤𝘦 systems, while the web system was built with 𝗔𝗻𝗴𝘂𝗹𝗮𝗿𝗝𝗦 𝗮𝗻𝗱 𝗔𝗦𝗣.𝗡𝗘𝗧 𝗠𝗩𝗖. For the database, we used 𝗦𝗤𝗟 𝗦𝗲𝗿𝘃𝗲𝗿 and 𝗣𝗼𝘀𝘁𝗴𝗿𝗲𝗦𝗤𝗟 for the web component. I also had the pleasure of joining the company’s group of partners, working in two capacities. As a partner, I participated in technical decisions related to the product; and as a 𝗳𝘂𝗹𝗹-𝘀𝘁𝗮𝗰𝗸 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿, I managed and coded various parts of the system.This experience of working on both sides allowed me to develop my 𝘀𝗼𝗳𝘁 𝘀𝗸𝗶𝗹𝗹𝘀, such as communication, empathy, and teamwork. Additionally, I honed my ability to guide people toward achieving the results the company expected from us.Over four years, we created a product made up of modules such as purchasing, inventory control, accounts payable and receivable, invoicing and receipt issuance, orders, report printing, and label printing, among others. This product was divided into three main systems: the POS system, used for sales in stores and grocery stores; the BackOffice system, which managed the POS systems and other modules; and a third web module, which allowed management for additional segments, such as beauty salons, by customizing information to meet their specific needs.

Porto Alegre, Rio Grande Do Sul, Brazil

I developed features for a hospital 𝗘𝗥𝗣 (Enterprise Resource Planning) using 𝗛𝗧𝗠𝗟, 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁, and 𝗷𝗤𝘂𝗲𝗿𝘆 𝗼𝗻 𝘁𝗵𝗲 𝗳𝗿𝗼𝗻𝘁 𝗲𝗻𝗱, and 𝗖# 𝘄𝗶𝘁𝗵 .𝗡𝗘𝗧 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸 𝗼𝗻 𝘁𝗵𝗲 𝗯𝗮𝗰𝗸𝗲𝗻𝗱, with 𝗦𝗤𝗟 𝗦𝗲𝗿𝘃𝗲𝗿 as the database. The most complex and challenging feature was the integration with health insurance systems, which aimed to validate whether a patient was eligible for a specific procedure. Initially, the front end used only plain 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁, but we later adopted 𝗷𝗤𝘂𝗲𝗿𝘆 to ensure greater cross-browser compatibility.This was my first experience working on a large-scale system to support some of the country’s largest hospitals, such as the Heart Hospital of São Paulo (HCor). Another valuable experience I gained during my time at Totvs was the use of Agile methodology, which helped me manage features, organize tasks, and handle timelines. It also improved my communication with leadership, as I learned to keep them updated on the development stages and the estimated delivery time.