Senior Backend Engineer (Python), Brazil

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 Senior Backend Engineer to help evolve and scale backend services, APIs, and orchestration workflows in a cloud-based environment.

In this role, you will contribute to the modernization of existing services, support the migration from Flask to FastAPI, and help build a more scalable, decoupled architecture using Azure. You will take ownership of API specifications and contribute to the reliability, performance, and observability of backend solutions.

Responsibilities

• Support the migration of backend services from Flask to FastAPI , improving maintainability, performance, and scalability

• Own and maintain API specifications, ensuring consistency, clarity, and alignment across integrations

• Evolve the multi-run orchestration flow, from API requests through multirun processing to Optim-core integration

• Help transition orchestration workloads toward queue-based workers running on Azure Container Apps , reducing dependencies on Azure Machine Learning Studio (AMLS)

• Design and implement run lifecycle APIs, article swap endpoints, and results persistence mechanisms

• Build and maintain reliable backend services using Python, FastAPI, and Flask

• Implement and maintain CI/CD pipelines, automated testing, and observability practices

• Identify and address technical challenges related to service reliability, integration, and distributed processing

• Collaborate with engineering teams and stakeholders to deliver robust, maintainable backend solutions

Requirements for this challenge

• Strong experience in backend software engineering using Python

• Hands-on experience with FastAPI and Flask , including API development and framework migration

• Experience designing, documenting, and maintaining API specifications

• Solid understanding of API architecture, service integration, and asynchronous processing

• Experience with Azure and cloud-based application deployment

• Knowledge of queue-based architectures, background workers, and distributed systems

• Experience implementing automated testing, CI/CD pipelines, and observability for production services

• Understanding of data persistence, API lifecycle management, and reliable service communication

• Strong problem-solving skills and the ability to make sound technical decisions

• Ability to work autonomously and collaborate effectively with cross-functional engineering teams

Nice to Have

• Experience with Azure Container Apps and containerized workloads

• Familiarity with Azure Machine Learning Studio (AMLS) and its integration with backend services

• Experience decoupling services and migrating from tightly coupled architectures to asynchronous, queue-based processing

• Knowledge of monitoring, logging, tracing, and production troubleshooting

• Experience with orchestration workflows involving multiple services or processing runs

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.