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JiyuHenko/README.md

Mateus Lemos Figueiredo

Jiyu Henko · Software engineer & founder

I build software across applied AI, developer tools, automation, and customer-facing systems.

I have been programming since 2016 and doing paid technical work with customers since around 2018. In 2024, I founded Custom Mind Software Solutions, where I work from problem discovery through architecture, prototyping, implementation, and iteration.

My current focus is on how AI fits into real engineering workflows: coding agents, tool-using systems, validation, CI, operational boundaries, and the difference between a system that looks finished and one that has actually been verified.

Selected work

  • Agentic SDLC Reference — a small, provider-agnostic reference workflow for coding agents built around explicit context, bounded authority, evidence-based validation, and resumable execution.
  • Violet — 2024 case study — an early tool-using AI assistant with browser automation, controlled local actions, persistent context, execution feedback, and human approval.
  • Portfolio — selected projects, experience, and technical background.
  • Custom Mind — custom software, automation, applied AI, and technical problem-solving for real client workflows.

What I care about

  • understanding the real problem before choosing the technology;
  • making AI useful inside engineering systems, not just impressive in demos;
  • keeping authority, side effects, and verification explicit;
  • building simple solutions that can survive contact with real users;
  • turning repeated failures into better tools and processes.

Technical range

C · Python · JavaScript · TypeScript · Java · Node.js · React · React Native · SQL · PostgreSQL · SQLite · Supabase · Playwright · GitHub Actions · Docker · AWS · APIs · coding agents

Languages: Portuguese — native · English — fluent · Spanish — fluent

Portfolio · LinkedIn · Email

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  1. agentic-sdlc-reference agentic-sdlc-reference Public

    Reference workflow for coding agents: explicit context, bounded authority, evidence-based validation and resumable execution.

    Python

  2. mateus-lemos-figueiredo mateus-lemos-figueiredo Public

    Applied AI & software engineering portfolio — AI systems, developer tools, automation and customer-facing engineering.

    HTML

  3. siteOficial siteOficial Public

    Custom Mind — custom software, automation and applied AI studio

    HTML

  4. SiteLara SiteLara Public

    Client system for LB FIT — influencer applications, admin workflows and Google Apps Script integration.

    HTML

  5. siteMamae siteMamae Public

    Production nutrition practice website with static build tooling, automated validation, accessibility and SEO checks.

    HTML

  6. siteCaligulas siteCaligulas Public

    Production website with ranking/admin workflows, integrations and automated quality validation.

    HTML