Senior Full-Stack Software Engineer (Python + React + AWS)

Vairix; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

Vairix is hiring a versatile engineer to build and maintain full-stack web products that blend data, visualization, and AI. You’ll work across asynchronous Python services, modern and legacy React interfaces, and AWS infrastructure, ensuring secure authentication and multi-tenant access.

You’ll implement APIs with FastAPI, leverage SQLAlchemy with data warehouses, and craft robust TS/React interfaces within Next.js and existing apps, while managing cloud infra and CI/CD pipelines.

Qualifications

• Strong Python 3.10+ experience with async development, FastAPI and Pydantic v2.
• Experience with SQLAlchemy 2.0 and writing SQL against a data warehouse.
• Proficiency in TypeScript and React 18/19, including Next.js App Router.
• Ability to work effectively with legacy React patterns such as React Router v5 and Redux.
• Hands-on AWS experience with IAM, S3, EC2 and Cognito, plus Docker and CloudFormation.
• Understanding of OAuth 2.0 or OIDC, JWT, CORS, secrets management, Git and CI/CD with GitHub Actions.

Responsibilities

• Develop asynchronous APIs with FastAPI and connect them to a data warehouse.
• Integrate large language models, including structured outputs and controls on usage costs.
• Build and maintain TypeScript and React interfaces across Next.js and an existing React application.
• Manage cloud infrastructure, containers, infrastructure as code and CI/CD workflows.
• Implement authentication, tenant-level authorization and application security.
• Work with Git and Gitflow to deliver and maintain software across the stack.

Tools

FastAPI

Pydantic v2

SQLAlchemy 2.0

TypeScript

React 18/19

Next.js App Router

React Router v5

Redux

AWS (IAM, S3, EC2, Cognito)

Docker

CloudFormation

OAuth 2.0 / OIDC

JWT

CORS

Secrets management

Git

GitHub Actions

TanStack Query

React Hook Form

Zod

Tailwind

shadcn/ui

Recharts

pytest

Cypress

Jest

Job description

Role overview

Build and maintain full-stack web products that combine data, visualisation and AI capabilities. The work spans asynchronous Python services, modern and legacy React interfaces, and AWS infrastructure, with responsibility for secure authentication and multi-tenant access. The role suits an experienced engineer comfortable moving across the application stack and making sound choices in established systems.

Responsibilities

• Develop asynchronous APIs with FastAPI and connect them to a data warehouse.
• Integrate large language models, including structured outputs and controls on usage costs.
• Build and maintain TypeScript and React interfaces across Next.js and an existing React application.
• Manage cloud infrastructure, containers, infrastructure as code and CI/CD workflows.
• Implement authentication, tenant-level authorization and application security.
• Work with Git and Gitflow to deliver and maintain software across the stack.

Requirements

• Strong Python 3.10+ experience, including async development, FastAPI and Pydantic v2.
• Experience with SQLAlchemy 2.0 and writing SQL against a data warehouse.
• Proficiency in TypeScript and React 18 or 19, including the Next.js App Router.
• Ability to work effectively with legacy React patterns such as React Router v5 and classic Redux.
• Hands-on AWS experience with services such as IAM, S3, EC2 and Cognito, plus Docker and CloudFormation.
• Understanding of OAuth 2.0 or OIDC, JWT, CORS, secrets management, Git and CI/CD with GitHub Actions.

Nice to have

• Snowflake, production LLM integrations, AWS Amplify or embedded analytics.
• Familiarity with TanStack Query, React Hook Form, Zod, Tailwind, shadcn/ui or Recharts.
• Testing experience with pytest, Cypress or Jest, and experience modernising legacy stacks.