Job Summary: Lead the evolution of the .NET ecosystem on AWS, supporting the team daily and directly contributing to architectural and solution decisions. Key Highlights: 1. Technical leadership in .NET/.NET Core (C#) and architecture 2. Mentoring and dissemination of best practices to the team 3. Designing and operating workloads on AWS with infrastructure as code We are specialists in **technological transformation**, combining human expertise with AI to build scalable tech solutions. With over 8,000 CI\&Ters worldwide, we have partnered with more than 1,000 clients throughout our 30-year history. Artificial Intelligence is our reality. **Important**: If you reside in the Metropolitan Region of Campinas, your physical presence at our city offices is mandatory, per our current attendance policy. Hello, this is Wal from CI\&T! I am part of the Talent Acquisition team and am looking for professionals located in Brazil for the **Tech Lead .NET/AWS** position, working on a financial services project. We are seeking a Tech Lead to lead the evolution of our .NET ecosystem on AWS, supporting the team daily and directly contributing to architectural and solution decisions. We seek a proactive, autonomous individual with clear communication skills and a focus on efficiency, quality, and innovation. **Responsibilities:*** Lead technical and architectural decisions in .NET/.NET Core (C\#), emphasizing high-performance, resilient, and scalable REST APIs. * Support and unblock the team as a technical reference: mentoring, pair programming, code reviews, and dissemination of best practices (SOLID, DDD, dependency injection). * Define engineering, quality, and security standards: unit tests (xUnit/nUnit/MSTest), coverage, design review, versioning standards, and Git workflow. * Orchestrate and evolve CI/CD pipelines and quality gates (e.g., Sonar), promoting continuous and reliable delivery. * Conduct end-to-end observability: instrumentation of logs, metrics, and traces; creation of dashboards and alerts (Splunk, Grafana, CloudWatch); and incident management. * Design, provision, and operate workloads on AWS: S3, EC2, ECS (Fargate), Lambda, NLB, as well as infrastructure as code using Terraform. * Collaborate with Product, UX, and QA teams for prioritization, trade\-offs, and user- and business-impact-centered solution design. * Integrate and evolve existing systems, identifying optimization and innovation opportunities—including in legacy environments (e.g., older SQL Server versions such as 2008\). * Promote agile practices (Scrum/Kanban) and a continuous learning environment, guiding junior and mid-level developers. * Act as guardian of architecture, quality, and observability. * Support the team in technical decision-making and solution decomposition. * Ensure applications meet customer needs with appropriate performance, security, reliability, and cost-efficiency. **Requirements for this challenge:*** Solid experience with .NET and .NET Core (C\# and ASP.NET Core) building and scaling APIs. * Proficiency in SOLID principles, DDD, and dependency injection. * Automated testing: experience with unit tests (xUnit/nUnit/MSTest) and quality best practices. * Hands\-on AWS experience: S3, EC2, ECS (Fargate), NLB, and Lambda; knowledge of networking, IAM, and monitoring (CloudWatch). * Infrastructure as code with Terraform (modules, workspaces, pipelines). * Observability with Splunk and Grafana (logs, metrics, alerts, dashboards). * Database: proficiency in SQL Server (modeling, query optimization, maintenance), including experience with legacy versions; knowledge of NoSQL. * Experience with messaging (Amazon SQS, Kafka, or RabbitMQ). * Experience with Git/GitHub and CI/CD practices. * Experience working in agile teams (Scrum/Kanban). * Clear and effective communication; proactivity and autonomy. **Nice-to-have:*** Experience working in banks and/or financial products * Knowledge of Python. * Code analysis tools (SonarQube/SonarCloud). * Experience with API Gateway, SNS, ALB, EKS/Kubernetes. * Architecture and engineering practices: Domain\-Driven Design (DDD), advanced SOLID, feature flags, trunk\-based development, GitOps. * Advanced observability (distributed tracing) and FinOps experience. * Collaboration with front\-end (React/Angular) for end-to-end solutions. \#LI\-WC2 **Our benefits:*** Health and dental insurance; * Meal and food allowance; * Childcare assistance; * Extended parental leave; * Partnerships with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass; * Profit and Results Sharing Program (PLR); * Life insurance; * Continuous learning platform (CI\&T University); * Discount club; * Free online platform dedicated to promoting physical health, mental health, and well-being; * Pregnancy and responsible parenting course; * Partnerships with online course platforms; * Language learning platform; * And many others More details about our benefits here: https://ciandt.com/br/pt\-br/carreiras At CI\&T, inclusion begins at first contact. If you are a person with disability, it is important to **submit your medical report during the selection process.** *Check which data must be included in the report* *by clicking here.* This way, we can ensure the support and accommodations you deserve. **If you do not yet have the qualifying medical report, don’t worry: we can support you in obtaining it.** We have a dedicated Health and Wellness team, experts in inclusion and affinity groups who will accompany you throughout every stage. Count on us to walk alongside you on this journey.