API Developer (Python, .NET, AWS)

Josh Pros LLC; Atlanta (GA); On-site; USD 96,000 - 165,000; Full time

Job summary

Josh Pros LLC seeks a full-stack backend API Developer for an onsite contract in Atlanta, GA. You will design, build, and support RESTful services across a mixed Python and .NET estate on AWS, collaborating with product, frontend, and platform teams.

Responsibilities include crafting secure APIs, integrating internal and external services, deploying on AWS, and maintaining high code quality through tests and reviews. Remote work is not offered; W-2 contract employment only.

Qualifications

• MUST have Python development experience and strong REST API skills.
• MUST have .NET (C#) experience and ASP.NET Core / .NET Core knowledge.
• Experience with AWS services (Lambda, API Gateway, ECS/EKS, S3, SQS/SNS, RDS/DynamoDB).

Responsibilities

• Design and develop secure REST APIs and microservices in Python and C#/.NET.
• Build integrations between internal services and third-party platforms.
• Deploy and operate services on AWS with Lambda, API Gateway, ECS/EKS, S3, SQS/SNS, and RDS/DynamoDB.
• Write unit and integration tests; ensure code quality through reviews.
• Implement auth (OAuth2, JWT), rate limiting, and API versioning.
• Troubleshoot production issues and improve performance and observability.
• Contribute to CI/CD pipelines and participate in Agile ceremonies.

Skills

Python

C# / .NET

AWS

REST API design

Agile/Scrum

Unit/integration testing

Security concepts (OAuth2, JWT)

API versioning

CI/CD

SQL/NoSQL

GraphQL

Education

Bachelor's degree in Computer Science, Engineering, or related field

Tools

FastAPI

Flask

Django REST Framework

Git

S3

Lambda

API Gateway

ECS/EKS

DynamoDB

CloudWatch

Job description

We are seeking a full-stack backend API Developer for an onsite contract (W-2) engagement in Atlanta, GA. You will design, build, and support RESTful services and integrations across a mixed Python and .NET estate running on AWS, working closely with product, front-end, and platform teams.

Responsibilities:

• Design and develop secure, well-documented REST APIs and microservices in Python and C#/.NET
• Build and consume integrations between internal services and third-party platforms
• Deploy and operate services on AWS using Lambda, API Gateway, ECS/EKS, S3, SQS/SNS, and RDS/DynamoDB
• Write unit, integration, and contract tests; maintain high code quality through reviews
• Implement authentication and authorisation (OAuth2, JWT), rate limiting, and API versioning
• Troubleshoot production issues, and improve performance, logging, and observability
• Contribute to CI/CD pipelines and participate in Agile ceremonies

Work mode: This is a 100% onsite role in Atlanta, GA — no remote or hybrid option.

Employment: Contract on our W-2 only. Candidates must hold independent work authorisation (no third-party employer or sponsorship arrangement). Rate depends on experience.

Requirements:

• Must have: Python
• Must have: .NET (C#
• ASP.NET Core / .NET Core)
• Must have: AWS
• Must have: REST API design and development
• Hands-on experience with Python web frameworks (FastAPI
• Flask
• or Django REST Framework)
• AWS services: Lambda
• API Gateway
• ECS/EKS
• S3
• SQS/SNS
• CloudWatch
• RDS/DynamoDB
• API security: OAuth2
• JWT
• API keys
• throttling
• and versioning strategies
• SQL and NoSQL databases; performance tuning of queries and endpoints
• OpenAPI/Swagger documentation and contract testing
• Docker
• Git
• and CI/CD pipelines
• Automated testing (pytest
• xUnit/NUnit) and Agile/Scrum delivery
• Good to have: Azure or GCP exposure
• event-driven and messaging architectures
• GraphQL
• Bachelor's degree in Computer Science
• Engineering
• or a related field
• Work mode: onsite in Atlanta
• GA (mandatory)
• Employment: our W-2 only — independent work authorisation required
• no third-party or sponsorship