Alex Rivera
Senior Full-Stack & AI Systems Engineer
High-impact Full-Stack & AI Engineer with 5+ years building sub-second cloud platforms, distributed APIs, and production LLM workflows. Proven track record of cutting P99 latency by 42%, scaling systems to 250K+ DAU, and driving measurable revenue growth.
⚡ Verified Quantified Impact Highlights
🚀 Featured Engineering & Business Case Studies
Problem statement, architectural execution, and verified business impact.
Sub-Second Enterprise ATS Parser & Diff Engine
Real-time Workday, Greenhouse & Lever resume scorer running on Groq LPUs.
The Problem: Job seekers were paying $49/mo for slow resume scanners that took 40+ seconds per scan and missed structural Workday parsing errors.
The Execution: Engineered a parallel AST/token rubric engine paired with Groq llama-3.3-70b inference and instant side-by-side STAR bullet diffing.
Zero-Latency Distributed Feature Flag & Telemetry Mesh
Edge-cached feature flag evaluation engine for multi-region SaaS platforms.
The Problem: Centralized database lookups for feature flags added 95ms of overhead to every authenticated API request.
The Execution: Built an edge-replicated evaluation worker with SSE invalidation streams and sub-millisecond in-memory evaluation.
💼 Verified Work History & Career Timeline
Senior Software Engineer @ VeloCloud Systems
San Francisco, CA- ▸Architected 14 high-throughput microservices in TypeScript, Go, and PostgreSQL, reducing P99 API latency by 42% across 250,000+ daily active users.
- ▸Spearheaded a real-time AI document diagnostic pipeline using Groq LPU inference, delivering <780ms median turnaround and lifting user conversion by 34%.
- ▸Cut annual AWS infrastructure spend by $48,000 (31%) by implementing Redis read-through caching and optimizing composite B-tree database indexes.
Full-Stack Software Engineer @ NovaPay FinTech
Austin, TX- ▸Built and scaled merchant checkout and Stripe webhook fulfillment engines processing $18M+ in annual payment volume with 99.99% reliability.
- ▸Led migration from legacy monolithic SPA to Next.js App Router, improving Largest Contentful Paint (LCP) by 53% and organic search traffic by 41%.
- ▸Mentored 5 junior developers and established automated Playwright + Jest CI/CD gates, cutting production hotfixes by 64%.