Senior Developer (.NET + React)

Description

At Valid, we work to enable secure identification of people, journeys, and transactions—both in the public and private sectors. Our physical and digital solutions are dedicated to three major ecosystems: * **Identification & Digital Government** * **Banks & Payment Methods** * **Secure Connectivity** Our role is to authenticate, authorize, and ensure the security of all stakeholders. This is what we deliver for each of our 1,200+ clients across Brazil and worldwide. **Our Valid Way** At Valid, we believe every person is unique, and our purpose is to empower the most authentic qualities in each individual—creating an environment where everyone can grow and leave their mark. We value professionals who build trustworthy relationships with external customers, partners, and other internal teams; who focus on improving existing solutions or creating new ones; who pursue excellence in delivery; and who practice teamwork and collaboration. All this forms part of our Culture—the Valid Way—which is embodied in our four core values: * ***Customer-Driven*** * ***Never Stop Evolving and Learning*** * ***Make It Happen—and Do It Right*** * ***Play Together and Play Fair*** This is what enables us to continue building a story of success and growth—and brings our purpose to life every day. Here at Valid, we value equal opportunity and are committed to building a safe, respectful, and inclusive environment for all people. We do not discriminate based on race, religion, color, nationality, gender, sexual orientation, disability, or any other basis. **Responsibilities and Duties** * Develop and maintain REST APIs, Windows Services, and Workers using **.NET 8.0** and .NET Framework 4.8. * Implement solutions based on SOLID design principles and scalable architectures. * Work with relational and NoSQL databases, ensuring integration and query optimization. * Develop user interfaces using **React JS, JavaScript**, HTML5, and CSS3, ensuring a smooth user experience. * Integrate and implement authentication using OAUTH, OpenID, and JWT. * Collaborate on development using GIT version control and messaging systems such as RabbitMQ or PubSub. * Ensure code quality and efficiency by applying sound development practices. **Requirements and Qualifications** * Solid experience with C#, .NET 8.0, and .NET Framework 4.8. * Advanced knowledge of JavaScript, HTML5, CSS3, and React JS. * Proficiency in developing REST APIs, Windows Services, and Workers. * Strong expertise in relational and NoSQL databases. * Knowledge of ORMs and messaging systems (RabbitMQ, PubSub). * Experience with OAUTH, OpenID, and JWT. * Solid understanding of object-oriented programming and SOLID principles. * Experience with GIT for version control. **Preferred Qualifications:** * Familiarity with software design patterns. * Experience with Docker and CI/CD pipelines. **Additional Information** Medical and Hospital Assistance Dental Plan Ifood Benefits Wellhub Transportation Allowance Childcare Assistance Profit Sharing (PLR) Life Insurance Remote Work Model Day Off **But What Exactly Is Valid?** We are an integrator of secure identification solutions for people, journeys, and transactions. Our solutions—both physical and digital—are dedicated to three major ecosystems: ID & Digital Government, Banking & Payments, and Secure Mobility. We are the market leader in civil identification in Brazil, one of the world’s top producers of financial cards, and the fifth-largest global supplier of SIM Cards for the mobile market. For over six decades, we’ve innovated daily to empower each person’s authenticity and simplify the lives of millions. **We Are Driven by Big Challenges** We aren’t afraid to fail while pursuing the best solutions to simplify life for our customers—and for the customers of our customers. Whenever a solution is complex, high-volume, and involves sensitive data, you can be certain Valid is behind it. Did you know Valid is already part of your everyday life in this way? **Learn More About Our Impact** **Physical, digital, and hybrid identity documentation for Brazilians passes through Valid** We issue over 250 million documents—including the **RG** (Brazilian ID card) and the **CNH** (driver’s license)—which are evolving into digital applications that, alongside their physical versions, are now in the hands of thousands of Brazilian citizens. **The connection of millions of people worldwide passes through Valid** Nearly one billion mobile devices are connected to the internet via **SIM Cards** and **eSIMs** produced and orchestrated by Valid. **Transactions originating from multiple locations and devices pass through Valid** Every day, more than 700 million transactions, payments, and inquiries are processed via Valid’s security solutions embedded in credit cards, invoices, and statements.