Alex Rivera
Profile
Senior Full-Stack Engineer with 7+ years building scalable web applications and distributed systems. Passionate about clean architecture, developer experience, and mentoring junior engineers. Track record of reducing page load times by 60% and shipping features used by 5M+ users. Open-source contributor with 2,400+ GitHub stars.
Experience
Senior Software Engineer
Mar 2021 — Present- Lead engineer on the Payments Infrastructure team, responsible for the real-time transaction processing pipeline handling $1B+ daily volume.
- Redesigned the payment retry logic, reducing failed transaction rate by 34% and recovering $12M in annual revenue.
- Built a distributed rate-limiter in Go that processes 400K req/s with sub-millisecond latency at p99.
- Led migration of 6 legacy Ruby services to a TypeScript/Node.js microservice architecture, cutting mean deploy time from 45 min to 4 min.
- Mentored 4 junior engineers and conducted 50+ technical interviews; improved team hiring pass rate by 20%.
Software Engineer II
Jun 2018 — Feb 2021- Full-stack engineer on the Search & Discovery team, owning the search ranking algorithm and front-end results page.
- Re-architected the search results React app with code-splitting and lazy loading, improving Core Web Vitals score from 43 to 91.
- Built a real-time pricing experimentation framework (A/B testing) serving 200M+ queries/day, directly contributing to a 7% booking rate lift.
- Implemented server-side rendering with Next.js, reducing Time-to-First-Byte by 58%.
Software Engineer
Aug 2016 — May 2018- Consulting engineer embedded with client teams to deliver greenfield applications and modernize legacy codebases.
- Delivered 8 client projects end-to-end using React, Ruby on Rails, and PostgreSQL within tight 3-month sprints.
- Introduced TDD practices across three client teams, increasing test coverage from <20% to >85%.
Education
Bachelor of Science, Computer Science
Aug 2012 — May 2016Focus on Distributed Systems & Programming Languages. Dean's List all 8 semesters. President of ACM student chapter. GPA: 3.82
Skills
Projects
OpenRPC — API Schema Toolkit
Jan 2020https://github.com/alexrivera/openrpc
TypeScript, Node.js, JSON Schema, GitHub Actions
Open-source library for auto-generating type-safe API clients from JSON-RPC schemas. 2,400+ GitHub stars, 180K weekly npm downloads. Used by 300+ companies including Cloudflare and Figma.
Latency Dashboard
Nov 2022 — Dec 2022https://github.com/alexrivera/latency-dash
React, D3.js, WebSockets, ClickHouse
Real-time observability dashboard for distributed systems latency analysis. Features p50/p95/p99 percentile tracking, flame graphs, and Slack alerting. Built during a 48-hour internal hackathon; now used by 12 engineering teams at Stripe.
devenv-cli
Mar 2023https://github.com/alexrivera/devenv-cli
Go, Docker, YAML, Cobra CLI
CLI tool that spins up reproducible local dev environments in <30 seconds using Docker Compose. 800+ GitHub stars.
Certifications
AWS Certified Solutions Architect – Professional
Sep 2022https://aws.amazon.com/certification
Certified Kubernetes Administrator (CKA)
Mar 2021https://www.cncf.io/certification/cka/
Google Cloud Professional Data Engineer
Jul 2023https://cloud.google.com/certification