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I will build your AWS backend in python
Rajan Kalwar
About this gig
Need a reliable backend on AWS without managing servers?
I will design and build a serverless backend using Python and AWS services such as Lambda, API Gateway, DynamoDB, Cognito, SQS, SNS and EventBridge.
I can help with:
- REST API development
- Lambda functions
- API Gateway configuration
- DynamoDB data modeling
- Authentication with Cognito
- Async background processing
- Event-driven integrations
- IAM and least-privilege permissions
- Error handling, retries and DLQs
- CloudFormation or Serverless Framework infrastructure
- Logging and observability
I build the infrastructure and application together so the result is reproducible and maintainable rather than manually configured in the AWS console.
Please contact me before ordering for larger architectures so we can define the scope correctly.
Get to know Rajan Kalwar
Rajan Kalwar
AWS Serverless and Backend Engineer
- FromNepal
- Member sinceFeb 2019
Languages
English, Nepali, Hindi
I'm a software engineer focused on building reliable backend and cloud systems on AWS.
I work primarily with Python, AWS Lambda, API Gateway, DynamoDB, SQS, SNS, EventBridge, ECS, Fargate, Docker, IAM, VPC networking, Terraform, CloudFormation, and Serverless Framework.
I can help you design and implement serverless APIs, event-driven systems, containerized backend services, AWS infrastructure, CI/CD pipelines, and cloud integrations.
I also work with production GenAI systems including RAG, LangChain, LangGraph, LlamaIndex, model APIs, streaming responses, and tool-based workflows.
My Portfolio
FAQ
What AWS services can you work with for a cloud backend?
I commonly work with AWS Lambda, API Gateway, DynamoDB, Cognito, SQS, SNS, EventBridge, S3, IAM, CloudWatch and related AWS services. The exact architecture will depend on your application requirements.
Can you build the complete backend from scratch?
Yes. I can design the architecture, implement the Python backend, configure AWS services, define IAM permissions and deploy the infrastructure using Infrastructure as Code.
Do you use Infrastructure as Code?
Yes. I primarily use Serverless Framework and CloudFormation so the infrastructure can be deployed consistently instead of being manually configured through the AWS console. I can also use Terraform if that's a requirement.
Can you add authentication and authorization?
Yes. I can implement authentication using services such as Amazon Cognito and configure authorization at API Gateway, Lambda or application level depending on the architecture.
Can you work on an existing AWS project?
Yes. I can extend, troubleshoot or improve an existing serverless application as well as build a new system from scratch.
Do you provide the source code?
Yes. You will receive the source code and Infrastructure as Code created as part of the agreed project scope.
Do you need access to my AWS account?
Not always. For deployment or troubleshooting, AWS access may be required. I recommend using a dedicated IAM user or role with only the permissions required for the task. I never require root-account access and I show project demos on my own AWS account
