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Backend Engineer - FastAPI & AWS Cognito

CAPITALNUMBERS INFOTECH LIMITED
Multiple Locations
4 - 7 Years
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4.2white-divider561+ Reviews

Posted on: 28/01/2026

Job Description

Description :



We are looking for a skilled Backend Engineer with strong experience in FastAPI, PostgreSQL, and modern authentication mechanisms.

The role involves building and securing scalable backend services using a microservices architecture on AWS, with a strong focus on API security and identity management using AWS Cognito and API Gateway.

Key Responsibilities :



- Design, develop, and maintain backend services using FastAPI.


- Build and optimize database schemas and queries using PostgreSQL.


- Implement secure authentication and authorization using JWT, AWS Cognito, and SAML.


- Develop and manage microservices-based architectures for scalable applications.


- Secure APIs using AWS API Gateway and integrate Cognito Authorizers for access control.


- Configure and manage AWS IAM roles and policies following the principle of least privilege.


- Ensure secure communication and data protection across services.


- Collaborate with frontend, DevOps, and cloud teams to design end-to-end solutions.


- Troubleshoot, debug, and optimize backend performance and security.

Required Skills & Qualifications :


- Strong experience with FastAPI and Python-based backend development.


- Hands-on experience with PostgreSQL and relational database design.


- Solid understanding of JWT-based authentication and authorization.


- Experience with AWS Cognito, including user pools, identity providers, and SAML integrations.


- Knowledge of microservices architecture and service-to-service authentication.


- Working knowledge of the AWS platform, including core services.


- Basic understanding of AWS IAM roles and policies.


- Familiarity with securing APIs using AWS API Gateway.


- Understanding of how API Gateway integrates with Cognito Authorizers.


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