Application Developer (APIs, Events, Platform Engineering) :: Remote (Fulltime)

TestingXperts; Washington (District of Columbia); On-site; USD 120,000 - 170,000; Full time

Job summary

TestingXperts is seeking an experienced Application Developer to design and maintain scalable cloud-native apps on AWS. You will build contract-first APIs, event-driven services, and reusable platform components using Python and TypeScript.

The role emphasizes API governance, IAM/authorization frameworks, and IaC with Terraform, collaborating with cross-functional teams to deliver reliable, secure solutions.

Qualifications

• Proficient in Python and TypeScript for backend services.
• Experience designing scalable cloud-native apps on AWS.
• Knowledge of API governance, OpenAPI standards, and contract-first APIs.
• Hands-on IaC with Terraform and cloud-native tooling.

Responsibilities

• Design, develop, and maintain backend apps using Python and TypeScript.
• Build contract-first APIs with OpenAPI and governance practices.
• Develop event-driven solutions using AWS services (EventBridge, SQS, SNS, Lambda).
• Implement API integrations, microservices, and reusable platform services.
• Apply fine-grained authorization with AWS Verified Permissions and Cedar policies.

Skills

Python

TypeScript

Event-driven architecture

OpenAPI/Swagger

Contract-first API development

Terraform

AWS

Authorization frameworks

CI/CD

Job description

We are seeking an experienced Application Developer (APIs, Events, Platform Engineering) to design, develop, and maintain scalable cloud-native applications and platform services on AWS. The ideal candidate will have strong expertise in Python, TypeScript, event-driven architectures, contract-first API development, platform engineering, and Infrastructure as Code (Terraform). This role requires hands‑on experience building robust APIs, event-driven systems, authorization frameworks, and cloud-native solutions for enterprise applications.

Key Responsibilities

• Design, develop, and maintain scalable backend applications using Python and TypeScript.
• Build and manage contract-first APIs using OpenAPI/Swagger standards and API governance best practices.
• Develop event-driven solutions leveraging Amazon EventBridge, SQS, SNS, Lambda, and other AWS services.
• Design and implement API integrations, microservices, and reusable platform services.
• Implement fine-grained authorization and access control using Amazon Verified Permissions and Cedar policies.
• Develop and manage Infrastructure as Code (IaC) using Terraform.
• Collaborate with Architects, DevOps Engineers, Product Owners, and Engineering teams to define scalable platform solutions.
• Ensure application reliability, security, scalability, observability, and operational excellence.
• Create automated testing frameworks and implement CI/CD pipelines for application delivery.
• Troubleshoot production issues and optimize application performance.
• Contribute to platform engineering initiatives, developer experience improvements, and engineering best practices