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JOAQUÍN MARTÍNEZ // SOFTWARE ENGINEERING

Senior software engineering for systems that need to evolve.

I design, build and modernize web applications, APIs and core business systems for companies that need reliable engineering without growing a full internal team.

Discuss a project Explore my work

CUSTOM SOFTWARE · MODERNIZATION · ARCHITECTURE · DELIVERY

REFERENCE ARCHITECTURESYSTEM DESIGN // EXAMPLE
01 / CLIENT
Web ApplicationReact · Angular · TypeScript
02 / EDGE
API GatewayREST · OAuth2 · JWT
03 / CORE
ServicesJava · Spring Boot · Domain logic
04A / DATA
DatabaseSQL · migrations
04B / PLATFORM
CloudCI/CD · observability
CLIENT WEBINTERFACE RESTPLATFORM CLOUD

// SERVICES

Build, modernize and connect your business systems.

Senior engineering from the first technical decision to dependable software in production.

SERVICES // 01

Custom Software Engineering

Replace spreadsheets and manual handoffs with software built around how your business operates.

  • Business web applications
  • Internal platforms & backoffice systems
  • Workflow automation

SERVICES // 02 PRIMARY EXPERTISE

Legacy System Modernization

Evolve critical applications through incremental changes that reduce the risk of a full rewrite.

  • Legacy application migration
  • Architecture & API modernization
  • Incremental replacement strategies

SERVICES // 03

Backend, APIs & Integrations

Connect fragmented systems with secure APIs and maintainable business logic.

  • Java / Spring Boot integrations
  • REST APIs & service design
  • Authentication & authorization

SERVICES // 04

Technical Architecture & Consulting

Resolve technical uncertainty with practical architecture reviews and a clear path to delivery.

  • Architecture reviews & technical strategy
  • Codebase assessment
  • Modernization roadmaps

// SELECTED WORK

Engineering in practice.

PROJECT // 01INSURANCELEGACY MODERNIZATION

Modernizing a legacy claims management platform.

A tightly coupled PHP and jQuery application made operational changes difficult. Business logic was progressively separated behind a Spring Boot API, with an Angular interface introduced incrementally.

Outcome Clearer boundaries between the interface and business logic, with a modern access-control model.

Explore case study

// APPROACH

Good software starts before the first line of code.

I begin with the business, the existing system and its constraints. From there, I look for the simplest architecture that can evolve safely—then deliver it in useful, production-ready increments.

  1. 01

    01 // UNDERSTAND

    Business before implementation.

    • Users & workflows
    • Existing system
    • Constraints
  2. 02

    02 // DESIGN

    Choose the simplest safe architecture.

    • System boundaries
    • Domain models
    • APIs & security
  3. 03

    03 // BUILD

    Deliver in useful increments.

    • Deployable changes
    • Testing
    • Production readiness
  4. 04

    04 // EVOLVE

    Engineer beyond the first release.

    • Monitoring & feedback
    • Technical debt
    • Incremental modernization

OPERATING PRINCIPLE // Understand the system. Change the smallest safe boundary. Learn from production. Repeat.

// ABOUT

Joaquín
Martínez

Senior Software Engineer
Independent Engineering Consultant

15+YEARS
SOFTWARE ENGINEERING

I help companies build and evolve the software their business depends on.

I work across requirements, architecture, implementation and production support, bringing a pragmatic approach to difficult technical decisions.

BASE
Mexico
WORK
Remote / international teams
FOCUS
Core business systems

ENGINEERING //

BACKEND
Java / Spring Boot / REST / SQL
FRONTEND
TypeScript / Angular / React
ARCHITECTURE
APIs / Security / Domain Design / Integrations
DELIVERY
Linux / CI/CD / Production Systems

// START A CONVERSATION

Have a system that
needs to evolve?

Tell me what you’re building, modernizing or trying to fix.

I’ll tell you where I can help and what a sensible next step would look like.

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