Siming Song

Led 8–10 engineers building cross-family messaging infrastructure for Meta’s wearables (Ray-Ban Meta and next-generation Meta wearables), unifying WhatsApp, Messenger, Instagram Direct, and native SMS onto a single platform.

• Stood up cross-org partnerships with WhatsApp, Messenger, and Instagram Direct — proposed the charter and drove all three orgs to resource dedicated wearable engineering and align on a shared technical platform
• Delivered simultaneous Day 0 messaging launch across 4 communication providers on 2 device platforms — the first multi-provider launch of its kind at Meta
• Shipped AI-powered wearable features: voice-driven Smart Contacts (speech recognition + on-device contact ranking) and Meta AI-assisted zero-friction account linking across WhatsApp, Messenger, and Instagram Direct
• Drove platform consolidation that eliminated parallel solutions, saving 8 engineer-equivalents annually and enabling a single codebase to serve all wearable products
• Improved provider linking reliability from 60% to 90% and contact sync reliability from 86% to 97%, unblocking product launch requirements
• Reduced application cold start time from 53s to 1.7s (31x improvement) and memory footprint from 150MB to under 100MB through targeted performance optimization
• Raised backend test coverage from 20% to 65% across two major pushes, establishing a culture of engineering quality
• Achieved 99% manager approval rating on internal Pulse survey — described by skip-level manager as “the strongest Pulse results I’ve ever seen”
• Grew 3 engineers to senior/staff level (IC6), supported 1 IC-to-EM transition, and drove 2 promotions; retained 100% of inherited team through org transition

Managed a team of 8 engineers building cross-platform content creation tools enabling advertisers to create, boost, and manage content across Facebook, Instagram, Stories, and Reels.

• Delivered cross-family Business Composer on mobile and web, the unified creation surface for organic and paid content — on time through alpha, beta, and PMA testing
• Designed BizComposer architecture and subscription system while also serving as hands-on IC contributor (109 diffs, 409 code reviews — top 5 in org)
• Doubled engineering team through recruiting with an exceptional conversion rate, praised by peer EMs as “astonishing success rate with reachouts”
• Drove multiple promotions across the team, including an IC5 → IC6 (Staff) promotion

Technical lead for Local Monetization and Lightweight Interfaces teams. Full-stack contributor across iOS, Android, web, data pipelines, and ads infrastructure.

• Tech-led Local Monetization team that exceeded transaction goal by 38% (20K+ vs 14.5K target), with holdout showing 12.5% revenue lift
• Launched Job Ads in Marketplace, driving 1% incremental Marketplace revenue and opening an entirely new ad domain
• Optimized Event Ads API by 36%, eliminating an entire class of timeout-related bugs
• Reduced job ads disapproval rate from 70% to 28% by diagnosing root cause in self-certification flow
• Built metric pipelines, revenue dashboards, and an experimentation framework adopted org-wide, establishing the team’s reporting standard
• Top 30% bootcamp mentor company-wide; intern manager; held 1:1s with 6 engineers across multiple teams