Full-Stack Python Developer

Full-Stack Python Developer (Backend + Front End)

About the role: You will build and extend features across the full stack of a web-based e-commerce product, working directly with the founder. You will own work from idea through production.

Required skills

Backend

Strong Python (3.11+) with FastAPI or Django
Async programming, background workers and task queues (Celery, RQ or similar)
PostgreSQL and database design
REST APIs, webhooks, idempotency, retries and signature verification
Production web scraping: Playwright or Selenium, proxy rotation, rate limiting, session handling, and adapting to changing page markup
OAuth flows and official third-party APIs
One-time-code authentication by SMS and email, secrets management, and general application security

Front end

Solid HTML5, CSS and JavaScript or TypeScript
Embeddable widgets that work inside third-party pages: iframe and Shadow DOM isolation, CSP, and cross-origin messaging
Mobile-first, accessible, performance-conscious UI
Building dashboards and admin interfaces (React or Vue is fine)

AI

Hands-on experience with the Claude API: prompt design, structured JSON output, image input, and cost and latency control
Building evals and regression tests for prompts
Designing around LLM uncertainty with confidence thresholds and human-review fallback

E-commerce platforms

Shopify app development: Admin GraphQL API, checkout extensions, app billing, and mandatory privacy webhooks
Working knowledge of WooCommerce (PHP and hooks), BigCommerce and Magento extension development
Payment gateway concepts: authorize, capture, void and refund flows

Privacy and compliance

GDPR and CCPA data handling
Familiarity with marketplace and App Store review requirements
Nice to have
Shipped a public Shopify app through App Store review
Fraud or bot-detection experience
Docker, CI/CD, and deployment on AWS or GCP
Experience with append-only logs, hashing, or cryptographic verification
Experience and traits
4–7 years of full-stack experience, mid to senior level
Takes ownership and is comfortable with ambiguity
Pragmatic: ships a working version, then hardens it
Designs defensively, assuming third-party sources will change and automated outputs will sometimes be wrong
Communicates clearly and documents integrations
Understands conversion-sensitive UX
Screening and interview exercises (neutral)
Take-home (3–4 hours): Build a Python service that takes a JSON profile, calls Claude for a structured score with a confidence value, and routes low-confidence results to a review queue. Include tests.
Design discussion: "A payment authorization is about to expire before a scheduled action completes. How do you detect it and handle it safely?"
Front-end task: Build a small embeddable widget that survives a hostile host-page stylesheet, works on mobile, and calls an API without exposing credentials.
Debug round: Diagnose a flaky scraper and a webhook that is firing twice.
Red flags
Scraping experience limited to basic requests + BeautifulSoup, with no experience handling blocking
Treats LLM output as ground truth
Only wants backend or only front end
No payments or webhook experience

Location: Remote - Anywhere

Skills required for this job:

• Accessibility
• Application security
• Asynchronous programming
• Back-end development
• BigCommerce
• CI/CD
• CSS
• Database design
• Docker
• Front-end development
• Full-stack development
• General Data Protection Regulation (GDPR)
• HTML5
• JavaScript
• LLM integration
• Magento
• OAuth
• Payment processing
• PostgreSQL
• Prompt engineering
• Python
• REST API
• React.js
• Responsive web design
• Shopify
• Shopify Developers Platform
• Task flows
• Web scraping
• Webhook
• WooCommerce