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rubjpDev/README.md

Hey, I'm Rubén 👋

Backend engineer. 4 years building distributed Java systems at enterprise scale. Now pushing into AI augmented engineering, multi agent development pipelines, MCP servers and deliberately pivoting my tooling toward Go & Python.

I'm looking for end to end ownership where backend decisions shape the product, not just close tickets.

🔨 Featured work

Project What it shows
subtrack Read + write MCP server over a Go backend. The MCP layer stays thin and language-agnostic, all business logic lives in the API and exposes seven task-shaped tools instead of a 1:1 endpoint mirror. Constant time API-key auth, money as integer cents, schema only in migrations.
Go (net/http) · pgx · PostgreSQL 16 · FastMCP · Docker
claude-sdd-harness Spec driven multi agent harness for Claude Code: orchestrator → spec_creator → coder → validator, EARS requirements, state on disk instead of the chat, a two lane system to control token cost, and a human approval gate before any code. Forked from Bettatech's subagent example and extended. An adapted version runs in production at my day job.
Claude Code · subagents · hooks · POSIX shell
order-matching-engine Limit order book in pure Kotlin, no frameworks, no I/O. Price time priority matching, O(1) hot path operations on TreeMap/ArrayDeque, @JvmInline value classes for zero allocation semantic types, immutable orders, and a reverse index for O(1) cancels.
Kotlin 2.1 · JVM · algorithms & data structures
event-aggregator-service Backend microservice consuming an unreliable external XML provider while guaranteeing zero downtime reads: scheduled sync with retry logic, manual cache-aside on Redis backed by PostgreSQL, decisions documented as ADRs.
Java 25 · Spring Boot 3.5 · Redis · PostgreSQL · Micrometer Tracing · Docker

🧰 Stack

Java Spring Boot Kotlin Go Python

PostgreSQL Redis Apache Kafka MongoDB

Docker Kubernetes AWS GitHub Actions

Architecture & AI · Hexagonal Architecture · DDD · Event Driven Architecture · REST API design · MCP · Multi agent orchestration

📍 Currently

  • Deepening Go & Python — just shipped subtrack v1.0, the first public piece of that pivot.
  • Anthropic certified on MCP (introductory + advanced courses).
  • Writing about backend engineering and AI tooling on LinkedIn.

📫 Reach me

LinkedIn · rubenjpdev@outlook.com

Pinned Loading

  1. subtrack subtrack Public

    An MCP server over a Go backend. The MCP stays thin and language agnostic, all business logic lives in the API

    Go 1

  2. claude-sdd-harness claude-sdd-harness Public

    A spec driven, multi agent harness for Claude Code: four roles, human approval gate and state on disk instead of the chat

    Shell 1

  3. event-aggregator-service event-aggregator-service Public

    A backend microservice that aggregates event data from an external XML provider, caches it in Redis, and exposes a RESTful search API. Built as a portfolio project to demonstrate production-ready p…

    Java 1

  4. order-matching-engine order-matching-engine Public

    Limit Order Book implemented in pure Kotlin. Price-time priority matching, O(1) operations, no frameworks.

    Kotlin 1