Hyalen M. Caldeira

AI Architect & Senior Full-Stack Engineer
- EST. 2026 .v1 -

.Portfolio

Some of the most recent projects I've selected.

.About Me

I'm a Senior Software Engineer who enjoys working across domains - AI Architecture, Full-Stack Development, DevOps/SRE, Cloud Engineering and SAP BTP/CAP/CPI. I like building systems end-to-end, solving complex problems, and creating tools that make other engineers faster and more productive.

A big part of my recent experience is focused on AI Systems and Multi-Agent Workflows. I've designed and developed AI Platforms using Python, LangGraph, LangChain, and MCP, including configurable workflow engines, Multi-Code-Generation Systems, and reusable MCP Blueprints used across teams and clients. I've also built AI Tools that reverse-engineer BPMN workflows, analyze process logic, and automatically generate documentation and User Stories - reducing analysis time and increasing clarity in large Integration Projects. I actively design and build advanced AI Systems, including a public, source-available platform for reverse engineering enterprise COBOL applications, developed independently in parallel with my professional work, by combining Compiler Theory, Graph-Based Program Analysis, and selectively orchestrated LLM Workflows.

Beyond AI solutions, I've built self-healing platforms, improved Kubernetes reliability, automated infrastructure with Terraform and Helm, and implemented CI/CD pipelines and observability stacks using Splunk, Grafana, and Dynatrace.

My background spans mission-critical Government Applications, high-traffic Ad Network APIs, E-commerce Platforms, and SAP BTP/CPI integration projects connecting enterprise systems. I've built full-stack applications with Java and Spring Boot, modernized legacy systems, and delivered scalable RESTful APIs across diverse business domains.

I work in Agile environments with a strong focus on Test-Driven Development, delivering production-grade solutions that teams can depend on.

I'm a builder at heart - I thrive on creating scalable systems, automating repetitive workflows, improving developer experience, and shipping software that solves real problems.

.How to contact me

For business contacts, collaborations, quotes or just to say "hello" write to:

hyalen@gmail.com

You can also find me on:

RESTful API, Java & Spring

Hello and Welcome to an exciting appplication of Algorithms Controller where I'm developing an end-to-end full stack Algorithm Dashboard App, similar to LeetCode, where you may manage questions/algorithms companies have been submitted you in your interviews.

I’ve built the backend server using Spring Boot where I used Spring Security along with JWT authentication. The app configuration model was developed using Spring Cloud. For storage I'm using MySQL database.

The frontend application was built using React. I've also used React Bootstrap for designing the user interface.

The application was totally developed from scratch and you can get all the source code hosted on GitHub as reference for a complete full-stack application.

Project: hCode by Hyalen
Client: Hyalen Caldeira
Date: 2018
Role: Software Engineer

React, Redux & React Native

This project is actually comprised of 3 React projects. Each one was an opportunity to demonstrate what I’ve done in Udacity React Nanodegree program.

React Fundamental - while the modularity of the React ecosystem makes it really powerful for building applications, there is a great deal to learn. In this first project, I used the foundational parts of the React ecosystem that are necessary to build production-ready apps. Project: MyReads, A Book Tracking App

React & Redux - Redux excels at state management, and in this project, I used Redux and React working together to make the application's state bulletproof.
Project: Readble

React Native - In this project, I developed an application that run on both iOS and Android devices. I had the opportunity to explore everything from setting up a proper development environment, building and styling a cross-platform mobile application. I incorporated native APIs such as geolocation and local notifications, and even took a look in how to get the app ready for the Google Play Store and the App Store! Project: Mobile Flashcards

Projects: React Fundamentals React&Redux React Native

Client: Hyalen Caldeira
Date: 2017
Role: React Developer

AI-Driven COBOL Reverse Engineering Platform

Architected and implemented an AI-Powered platform for reverse engineering legacy COBOL systems into structured, analyzable representations, bridging compiler theory with modern agent-based AI Architectures. This project is developed independently, outside of my employment and client responsibilities.

Built compiler-style analysis pipelines (AST, ASG, CFG, DFG, PDG) to extract deterministic program structure and semantics;
Designed graph-based representations for cross-program dependency analysis and system-level understanding;
Implemented agent-driven workflows using LangGraph to orchestrate multi-step analysis and reasoning pipelines;
Integrated LangChain for controlled LLM interactions, enabling selective AI usage while preserving cost efficiency and determinism;
Designed and implemented an MCP-based modular tooling architecture, enabling scalable tool execution, and future extensibility;
Added enterprise-grade observability and execution metadata (timing, runs, errors) to support debugging and operational insights.

The platform combines Compiler Theory, Graph-Based Program Analysis, and selectively orchestrated LLM Workflows, and is exposed via Model Context Protocol (MCP) servers consumable by MCP-compatible clients such as Cursor and Claude.

MCP Endpoints:

MCP Server (HTTP transport): http://mcp.hyalen.us:8003/mcp
MCP Server (SSE transport): http://mcp.hyalen.us:8001/sse
Health: http://mcp.hyalen.us:9090/health
Prometheus Metrics: http://mcp.hyalen.us:9090/metrics

Project: COBOL AI Platform
Client: Independent Project
Date: 2025-2026
Role: AI Architect & Developer

Hyalen M. Caldeira

.Portfolio

.About Me

.Certificates

.How to contact me

hyalen@gmail.com