At CI&T, we help large enterprises transform the potential of AI into real business impact with AI Deployment, AI-native execution, and tech-integrated business solutions. With 30 years of experience in technological transformation, we accelerate innovation with expertise in Agentic SDLC, Application modernization, Data & AI, Martech and Business strategy. We are 8,000 CI&Ters across more than 25 countries, collaborating to build solutions with real impact. AI is already part of how we work, evolve, and innovate every day. We are looking for a Tech Lead (.NET) to guide our engineering team, driving the technical vision, architecture, and delivery of complex back-end software solutions. In this role, you will balance strategic technical leadership with hands-on guidance, working closely with a multicultural team spread across Brazil, Colombia, the UK, and the USA. All communication is conducted in English. Key Responsibilities: - Technical Leadership & Architecture: Define and evolve the technical direction, architecture, and design patterns for back-end services using C#, ADO.NET, and SQL Server. - API Governance: Oversee the implementation, evolution, and standardization of SOAP and REST APIs, ensuring robust versioning, security, and best practices. - Quality & Reliability: Guarantee system reliability and scalability by establishing standards for testing (unit/integration), monitoring, and root-cause analysis for complex production issues. - Mentorship & Team Growth: Lead code reviews, mentor senior and junior engineers, and foster a culture of engineering excellence and continuous learning. - System Integration: Oversee the seamless integration of various legacy and modern systems, ensuring high performance and decoupling where necessary. - DevOps & CI/CD Strategy: Drive the optimization of CI/CD workflows and automated pipelines to enhance development velocity and deployment safety. - Cross-functional Collaboration: Partner with product managers, stakeholders, and cross-border teams to translate business requirements into scalable technical roadmaps. Required Skills and Qualifications: - Language: Advanced/Fluent English proficiency. - Proven Leadership: Experience acting as a Tech Lead, Team Lead, or Principal Engineer in a production environment. - Expert .NET Ecosystem: Deep, hands-on experience with .NET Framework and .NET Core. - Data Layer Mastery: Solid understanding of ADO.NET and SQL Server, with a proven track record in database design, optimization, and performance tuning at scale. - Integration Expertise: Strong experience designing and maintaining SOAP and RESTful web services, including proficiency in XML serialization/deserialization. - Architectural Acumen: Mastery of software design patterns, clean architecture, and modern distributed system design. - Communication: Exceptional communication and stakeholders-management skills, with resilience in fast-paced, multicultural environments. Nice-to-Have Skills: Cloud platform expertise, preferably Azure. Familiarity with specification-driven development and agentic approaches to software development. Experience leading teams within Agile/Scrum development methodologies. If you are a seasoned technical leader ready to drive architectural excellence and mentor a high-performing, diverse team, we invite you to apply and shape the future of our platforms! Our benefits include:   - Premium Healthcare - Meal voucher - Maternity and Parental leaves - Mobile services subsidy - Sick pay-Life insurance - CI&T University    - Colombian Holidays - Paid Vacations And many others.      Collaboration is our superpower, diversity unites us, and excellence is our standard.  We value diverse identities and life experiences, fostering a diverse, inclusive, and safe work environment. We encourage applications from diverse and underrepresented groups to our job positions.