Hello, World.

I'm Alex Kua.

Senior Full-Stack Engineer Technical Lead Backend Architecture Distributed Systems

More About Me
About

Let me introduce myself.

Alex Kua

Senior Full-Stack Software Engineer and Tech Lead with 10+ years of experience building complete web applications — from backend architecture and database design to frontend implementation. Specialized in distributed systems and technical leadership across high-throughput, high-availability platforms, with deep domain experience in payments and fintech.

Most recently I built PayFlow, a production-grade distributed payment processing platform in Go, and shipped Kespas — a social event app with AI-powered discovery — independently to the iOS and Android App Stores. I own features end-to-end and thrive in fast-moving product environments.

Claude Code is my primary engineering surface across planning, implementation, and review. I build AI-powered features in production and have a genuine daily practice around agentic development workflows.

Profile

  • Name: Alex Kua
  • Job: Senior Full-Stack Software Engineer & Tech Lead
  • Website: www.alexkua.com
  • Email: [email protected]

Skills

  • Back-end: Go, PHP (Laravel), Node.js, Hono, TypeScript, REST APIs, microservices, edge computing
  • Front-end: Vue.js (Nuxt 2/3), React, React Native, JavaScript, TypeScript, HTML5, CSS3
  • Payments: Stripe, PaymentIQ, crypto integrations, cashier systems, idempotency, webhook processing, reconciliation, fraud prevention
  • Databases: PostgreSQL, MySQL, Redis, MongoDB
  • Infrastructure: Docker, Docker Compose, Kubernetes, Nginx, AWS (EC2, Lightsail, RDS, S3, IAM), Cloudflare Workers, GitHub Actions, CI/CD
  • AI: Anthropic Claude API, agentic systems, Claude Code, applied LLM integration
  • Testing: PHPUnit, Jest, Vitest, unit testing, integration testing
  • Tools: Git (GitHub, Bitbucket), JIRA, Agile/Kanban/Scrum, code review, stakeholder management
Resume

More of my credentials.

Work Experience

Rivalry

September 2022 – February 2026

Senior Software Engineer → Technical Lead

Online sportsbook and casino platform. Worked across multiple product teams — sportsbook, casino, marketing, user retention, and responsible gambling — before moving to the payments & cashier team for the final year, progressing to Technical Lead.

As Technical Lead: served as the main technical point of contact for all payments engineering, led architecture for systems handling thousands of daily transactions, managed team backlog in collaboration with stakeholders, and conducted code reviews across the team.

As Senior Software Engineer, Payments: architected a PaymentIQ integration routing transactions across multiple providers through a unified cashier layer, built direct payment provider integrations, developed custom payment routing rules, implemented fraud prevention systems, built admin tooling and dashboards, and led the frontend implementation of the cashier in Vue.js (Nuxt).

Stack: PHP (Laravel), Node.js, Hono, Vue.js (Nuxt 2/3), MySQL, PostgreSQL, Redis, Cloudflare Workers

SnapX (start-up)

June 2018 – November 2021

Co-Founder & Software Development Team Lead

Co-founded an automated bookkeeping SaaS platform leveraging AI-powered receipt classification and data extraction. Led technical development from concept to production, making all critical architectural decisions. Built and managed a cross-functional team of developers and QA specialists using Agile methodologies. Integrated multiple accounting software APIs (QuickBooks, Xero, Sage, Acomba) for seamless data synchronization.

Stack: PHP Laravel, React, React Native, jQuery, MySQL

Sécurité XGuard (start-up)

January 2020 – July 2021

Chief Technology Officer

Led all technical strategy and development for a technology-enhanced security services company. Architected and implemented internal operations management systems. Established development workflows, quality standards, and coordinated between technical and business teams.

Stack: PHP Laravel, React, React Native, MySQL

FlightHub (Momentum Travel Group)

March 2018 – June 2019

Lead Web Developer

Progressed to lead position, managing tasks and coaching team developers. Led development of the company's online contact center platform integrating multiple third-party services. Built scalable solutions for high-traffic travel booking systems. Conducted code reviews and mentored junior developers.

Stack: PHP Laravel, React, MySQL

Personal Projects

PayFlow

2026 — Live Demo  |  GitHub

Distributed Payment Processing Platform

A production-grade distributed platform built from zero Go experience, with full ownership of all architectural decisions. Containerized and deployed to production:

Distributed saga pattern, idempotency at every layer, optimistic locking, circuit breaker, backpressure queue middleware, real-time SSE via Redis Pub/Sub, webhook deduplication, daily Stripe reconciliation, distributed tracing with OpenTelemetry, Prometheus metrics, and Grafana dashboards. AI insights panel powered by Claude (claude-sonnet-5) aggregates payment data into narrative analysis. Load tested with k6 — 20 concurrent users, p99 78ms, 0% error rate across 3,388 orders. CI/CD via GitHub Actions.

Stack: Go 1.26, PostgreSQL, Redis, Stripe, React 19, Docker, Nginx, OpenTelemetry, Prometheus, GitHub Actions

Kespas

2026 — iOS  |  Android

Social Event Discovery App

A social event discovery and planning app built and shipped independently to both the iOS and Android App Stores.

AI-powered event discovery using Claude, Gemini, and Perplexity APIs. Real-time features via Centrifugo. Integrated Ticketmaster Discovery API, Google Places, Mapbox, and Twilio. Deployed on AWS (Lightsail, RDS, S3) with GitHub Actions CI/CD. Observability via Sentry and PostHog. Built entirely using Claude Code as the primary development tool.

Stack: React, React Native, TypeScript, Expo, Laravel, PostgreSQL, Centrifugo, AWS (Lightsail, RDS, S3), GitHub Actions

Education

École de technologie supérieure

2012 – 2015

Bachelor's degree, Software Engineering

 

Collège Montmorency

2008 – 2011

Diploma of College Studies, Information Technology

Services

What Can I Do For You?

Contact

I'd Love To Hear From You.

Whether you have a project in mind, want to discuss opportunities, or just want to connect—feel free to reach out via email or LinkedIn!

Where to find me

Laval, QC (Remote)

Message me on

LinkedIn

Email Me At

[email protected]