Full-Stack Python Developer

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 with the owner. Creative Works provides top-tier talent for website development, UX/UI design, and marketing, integrating seamlessly as a 'behind the scenes' partner. Based in Stroudsburg, PA, with a presence across Central and South America, their developers are available in all US time zones with expertise across modern environments, CMS, and programming languages. They offer flexible hourly, retainer, or project-based solutions, often stepping in to resolve critical development issues for companies.

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.

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.

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

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

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