SENIOR BACK-END DEVELOPER | C# | .NET (Support and Core Team)

Description

Job Summary: This role is for someone who enjoys diving deep into complex legacy microservices, investigating failures, stabilizing systems, and evolving solutions that directly impact the customer experience, requiring an analytical and investigative approach. Key Highlights: 1. Working in the operational core of critical and legacy systems. 2. Investigating complex production failures and evolving solutions. 3. Creating, maintaining, and evolving scalable back-end solutions. **Here’s what you’ll find at Dotz** Big Dreams People who deliver results We value our People Owner’s hunger We enjoy the journey with passion This opportunity is for those who love to dive deep. You will work in the operational core of Dotz’s systems, taking ownership of critical microservices—many of them legacy—built by different teams over time. The challenge lies in understanding code you didn’t write, investigating real failures, stabilizing services, and evolving solutions that directly impact the end-customer experience. It’s analytical, investigative work with a high degree of responsibility, performed cross\-service to ensure stability, reliability, and continuous evolution. If you’re motivated by solving complex problems and delivering concrete impact, click now to learn more about this role. **Responsibilities and Duties** * Create, maintain, and evolve scalable, high-performance, and reliable microservice\-based back\-end solutions; * Take ownership of Core services, performing fixes, refactorings, and stabilization; * Investigate complex production failures; * Develop and maintain robust, well-documented RESTful APIs; * Troubleshoot production incidents and actively participate in deployments and root cause analyses; * Participate in architectural discussions for both new projects and existing system evolution; * Contribute to code quality through: * code reviews; * defining standards; * unit and automated testing; * technical documentation; * Work in a DevOps model, overseeing the full software lifecycle—from code to production; * Collaborate closely with other teams and services across the Dotz ecosystem; * Share technical knowledge and best practices with the team. * Be highly analytical, resilient, and investigative; * Work with legacy code; * Navigate complex, poorly documented systems; * Enjoy uncovering the root cause of real business problems; * Assume responsibility for critical systems; * Work in environments where failure directly impacts the end customer. **Requirements and Qualifications** * Back\-end — At least 5 years of software development experience; * Advanced proficiency in C\# (.NET Core — Full Framework as a plus); * Advanced proficiency in Python, including: SQLAlchemy (ORM), Alembic (migrations), FastAPI (desirable); * Databases — Relational: SQL Server, PostgreSQL, MySQL; Non\-relational: MongoDB, Redis; Languages: T\-SQL, PL/SQL or PL/pgSQL; * Microservices architecture, Cloud, and DevOps; * RESTful APIs; * Messaging, asynchronous processing, logging, transactions, load balancing, Docker, Kubernetes; * Cloud: AWS or GCP; * CI/CD (GitHub Actions, Jenkins, Azure DevOps or similar); * Infrastructure provisioning via Terraform; * APM and observability (ELK, New Relic or similar); * Knowledge of best practices such as: SOLID, Clean Code, TDD, DevOps culture, Automation. * Nice-to-haves: * Front\-end knowledge (Angular, React or React\-Native) to understand integrations; * Experience with high-criticality, high-volume digital products; * Experience in SuperApp, fintech, or distributed ecosystems. **Additional Information** * PJ — Remote work model. **\#JoinDotz!** We are a company founded in 2000 to increase the purchasing power of Brazilians. We do this by delivering access to benefits for people across Brazil. Over the past 20 years, we’ve reached over 50 million people nationwide who feel empowered to achieve more—a company with a story to tell. We became known for our work in loyalty programs, connecting consumers to our partners through rewards. We have multiple partnerships across diverse sectors: major retail chains, e\-commerce platforms, prominent banks, and the largest mobile telecommunications company in the country. Today, Dotz is much more than that. Through our Super App, we offer direct access to benefits for consumers. The Dotz app includes a digital account and other financial services. Users who pay with Dotz gain benefits on every purchase they make. Additionally, they have the freedom to choose the type of benefit they prefer: products, services, discounts, or even cashback into their account. Using Dotz, routine payments become gateways to advantages. The more you use it, the more you earn. Living with Dotz means earning while living. A multifaceted system, integrated into a single app, to democratize access to benefits. With Dotz, you can do more. **How cool is that!** We were recently recognized by our customers in important national awards in the loyalty program category: we won 1st place in the Reclame Aqui Award 2020 and were named “the most enchanting company for customers” in the Modern Consumer Survey. **\#JoinDotz** **We’re building a more plural and diverse Dotz for everyone!** We’re implementing initiatives to foster an innovative, ethical, inclusive, and safe workplace—one that **respects people and their individualities**. Dotz understands that plurality is part of what drives **\#OurPeople**, which is why we’re committed to cultivating an inclusive culture. We make no distinction based on race, color, religion, gender identity, sexual orientation, nationality, disability, or age at any stage of the selection process—reinforcing our commitment to diversity.