Senior Backend Engineer (Python/PHP) focused on performance, reliability, and security in data-intensive SaaS.
Remote from Chile (UTC-3) with strong US-hours overlap.
- Reduced a critical SQL query from 40s to 3s through query redesign and execution plan validation
- Enabled fast search on 20M+ records via MySQL FULLTEXT indexing and query tuning
- Built usage-based billing (USD-to-credits) and subscription payments with Stripe
- Implemented session-bound tokenization/encryption to prevent cross-user data exposure
- engineering-decisions: short case studies on performance, payments, and security (coming soon)
- stripe-webhooks-idempotency-lab: idempotency, retries, dedupe store, tests (coming soon)
- mysql-performance-playground: EXPLAIN, indexing, FULLTEXT, benchmarks (coming soon)
- secure-token-links: session binding, expiry, rotation (coming soon)