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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're seeking an exceptional Senior Software engineer to join our Technology team. You will be a technical reference for designing, architecting, and delivering scalable solutions, acting as a bridge between technical innovation, data security, and business impact. You'll work within a stable team, working in the architecture and evolution of our solutions over time. The ideal candidate combines strong cloud experience (especially AWS), hands-on expertise in LLMs, AI agents, and Generative AI architectures, a security-first mindset, and the maturity to make architectural decisions independently while providing technical guidance to other team members. Responsibilities You will own the architecture of distributed, cloud-native systems end-to-end, from infrastructure-as-code (AWS CDK) through to production operations. You will author Architecture Decision Records that establish standards outlasting any single project, and translate ambiguous business requirements into scoped, shippable technical plans, driving alignment across product and engineering stakeholders. Beyond your own delivery, you will raise the technical bar of the team through code reviews, design critiques, and mentorship, taking ownership of the growth of the engineers around you as seriously as the systems you build. Requirements Proficiency in English at a C1 level or higher Strong experience years of non-internship professional software development experience Extensive programming experience with JavaScript/TypeScript Experience leading the design or architecture (design patterns, reliability, and scaling) of new and existing systems Years of experience developing cloud-native applications and platforms using Lambda, S3, DynamoDB, AWS Bedrock, SQS, SNS, and ECS, with the ability to make architectural decisions around cost, performance, and scalability Experience with or passion for generative AI Experience as a mentor, tech lead, or engineering team lead Experience leading the design, build, and deployment of complex, performant (reliable and scalable) software solutions in production Nice to Have Experience across the full software development life cycle, including coding standards, code reviews, source control management, build processes, testing, and operations Bachelor's degree in computer science or equivalent Experience developing IaC using Terraform or AWS CDK Experience developing with AI tooling such as Claude Code or Cursor Experience building or integrating AI agents using orchestration frameworks such as LangChain, LlamaIndex, Semantic Kernel, or similar #LI-LO1 Our benefits: Health and dental insurance Meal and food allowance Childcare assistance Extended paternity leave Partnership with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass; Profit Sharing and Results Participation (PLR); Life insurance Continuous learning platform (CI&T University); Discount club Free online platform dedicated to physical, mental, and overall well-being Pregnancy and responsible parenting course Partnerships with online learning platforms Language learning platform And many more! More details about our benefits here: https://ciandt.com/br/pt-br/carreiras At CI&T, inclusion starts at the first contact. If you are a person with a disability, it is important to present your assessment during the selection process. See which data needs to be included in the report by clicking here.This way, we can ensure the support and accommodations that you deserve. If you do not yet have the assessment, don't worry: we can support you in obtaining it. We have a dedicated Health and Well-being team, inclusion specialists, and affinity groups who will be with you at every stage. Count on us to make this journey side by side.