Filip L.

2017–2025 · Remote (Austin, TX)

promoted Senior → Lead → Principal

99.9%+ uptime for 10M+ users through Olympics-scale traffic (2,000+ years of watch time in two weeks) and NFL playoff peaks.

Cut build times ~90% (15 min to ~2 min) by leading a monolith-to-modular migration across 4 platforms, with trunk-based development and feature flags.

Cut playback start time 40% and rebuffering 4x with a custom buffering technique, eliminating ~40,000 daily buffering events. Published the approach for the dev community.

Drove AI-assisted development adoption across multiple engineering teams: audited workflows, set up the tooling, ran live pair-programming sessions. Teams kept using it after I left.

Part-time (~20h/week) · Remote (UK)

first engineer → VP · team 0 to 6

Built the full DTC product from scratch: mobile apps (native then React Native), Shopify storefront, WordPress marketing sites, and internal React dashboards.

Built Stripe payment infrastructure: recurring subscriptions, one-time purchases, complex pricing tiers, and webhook orchestration.

Migrated native iOS/Android to React Native

Owned build-vs-buy and the technical roadmap, working directly with founders.

Company raised $2M+.

Built a multi-agent LLM system that runs in production daily: a lead agent maps each app's architecture, then orchestrates 8 specialized investigators in parallel across security and privacy domains. 15,000+ obfuscated classes analyzed per app.

Production stack: FastAPI backend, React frontend, Stripe billing, OTP auth, and 11 workers across 2 servers handling iOS/Android decompilation, CI/CD, and monitoring with auto-recovery.

Designed a 7-stage analysis pipeline with a scrutiny layer that learns from false positives and adjusts severity over time, plus a knowledge graph that grows with every scan for cross-app pattern queries.

Automated flow: 30 minutes from submission to a scored report, no manual intervention.

smart-lighting hardware · concept to market

Took a smart-lighting hardware product from concept to market: industrial design, IoT integration (Alexa, Google Assistant), manufacturing, and supply chain.

Launched an e-commerce storefront and took pre-orders. Full product lifecycle beyond software.