Full-Stack Python Developer

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

Responsabilidades: 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.

Deseable: • 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