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Staff Backend Engineer — Benifex

Matthew Carr

I put good engineering principles and design into agentic systems — to build well-thought-out applications, in the open.

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Role

Staff Backend Engineer

Stack

Java · Spring Boot · AWS · GCP · Kubernetes

Now

Benifex

Focus

Engineering principles. Agentic systems.

01 · Building

What I'm building

Travel Planner

Collaborative travel budget planning for multi-destination, round-the-world trips. Production-quality Next.js with DDD-inspired layered architecture, built AI-assisted.

  • Next.js 16
  • TypeScript
  • Drizzle
  • Expo

AI Plugins

Engineering principles and reusable agent skills — TDD loops, architecture reviews, design grilling, dependency triage — distributed as plugins for Claude Code, Codex, Cursor and more.

  • Go
  • Agent Skills
  • Clean Architecture

This Site

Built in the open: Next.js 16 and GSAP, server-rendered, tested with Vitest, Playwright and axe.

  • Next.js
  • GSAP
  • Playwright

02 · About

Well-designed systems don't happen by accident. I capture the principles behind them — DDD, clean architecture, safe delivery — as living documents and skills that AI agents apply when they write code.

Matthew Carr

01

Design for change.

Systems that absorb new demands without rewrites.

02

Ship safely.

Progressive delivery. Guardrails. Boring releases.

03

Leave clear trails.

Readable code. Sharp docs. Paved paths.

03 · Toolbox

Technical skills

Java
Spring Boot
Kotlin
PostgreSQL
MySQL
MongoDB
Snowflake
Terraform
Docker
JavaScript
TypeScript
Cypress
Angular
React
NextJS
AWS
Azure
GCP

04 · Current

Staff Backend Engineer at Benifex

Product-led work across multiple projects.

Benifex logo

05 · Let's connect

Not hiring myself out.
Always open to talk.

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