Sunbelt Computer Software

👋 Hi, I'm TSALA Steve Gires

Full Stack Developer | Java/Kotlin Developer | Javascript/Typescript Developer | AI Agent Builder

Passionate and impact-driven Full Stack Developer with nearly 6 years of experience designing, building, and optimizing enterprise-grade applications. Specialized in backend architectures (Java, Spring Boot, Microservices, Kotlin) and modern frontend frameworks (React, Angular 19). Proven track record of architecting event-driven systems (Redis, BullMQ), extensible plugin architectures, and AI agentic workflows. Experienced in leading development teams, implementing secure authentication systems (OAuth 2.1), and collaborating in bicultural/bilingual teams.

🚀 About Me

💻 Full Stack Developer specialized in backend architectures, high-quality frontend tooling, and advanced API design.
🔧 API Specialist experienced with REST, GraphQL, GraphQL Federation v2, Module Federation v2, and OAuth 2.1.
🌍 International Collaboration working with distributed teams (Intesys, ISF, Adesso, ExMachina).
🤖 AI Agent Enthusiast building Model Context Protocol (MCP) servers, agentic workflows, and prompt engineering utilities.
📦 Component Creator passionate about building modular, reusable libraries and cross-platform applications.

🛠️ Tech Stack

🔹 Languages

🔹 Backend & API Design

Core Stacks: Java 8+ (Java 25), Spring Boot (Spring Boot 4), Kotlin, RESTful APIs
Event-Driven & Messaging: Redis, BullMQ
API & Specs: OpenAPI 3.1, GraphQL, GraphQL Federation v2 (Apollo Federation, Hive Gateway), GraphQL Yoga, REST
Security & IAM: OAuth 2.1, Spring Security (OAuth Authorization Server), Single Sign-On (SSO)

🔹 Frontend & Cross-Platform

Web Frameworks: React (React Router v7), Angular 19
Design & Styling: Tailwind CSS v4, shadcn/ui, CSS3, HTML5
Tooling & State: Vite, Storybook 10, Redux Toolkit, TanStack Query, RxJS, Zod, Biome
Mobile & Cross-Platform: Flutter, React Native, Jetpack Compose, Compose Multiplatform, Kotlin Multiplatform

🔹 Databases & ORM

Relational Databases: PostgreSQL, MySQL, SQL Server
NoSQL & Cache: Redis, MongoDB, GridFS
ORMs & Data Layers: Spring Data JPA/Hibernate, drizzle-orm, Mongoose

🔹 Testing & DevOps

Testing: JUnit, Mockito, Cypress, Vitest, WireMock, MSW, Playwright, TDD
DevOps & Containers: Docker, Kubernetes (K8s)
CI/CD: GitHub Actions, GitLab CI, Jenkins

🔹 AI Agents & Dev

Frameworks & Protocol: Model Context Protocol (MCP), LangChain
AI Tooling: AI Code Review, AI-Assisted Development, Agentic Workflows, Prompt Engineering

🔹 Systems & Infrastructure

Server: Nginx, VPS Administration
OS: Ubuntu, Manjaro Linux, macOS, Windows

🧩 Highlighted Experience (Uni2grow Cameroon)

🔸 Smart Doc (Full Stack Tech Lead)

Designed an API-first microservices backend with Java 25, Spring Boot 4, and OpenAPI specifications.
Built a pluggable microfrontend using React 19, Vite 7, and Module Federation v2.
Implemented CI/CD pipelines via GitHub Actions and Docker containerization.
Tech: Java 25 • Spring Boot 4 • React 19 • Vite 7 • Module Federation v2 • Docker • GitHub Actions

🔸 Open Hospital 2.0 (Analyst Developer)

Designed and implemented a plugin system allowing the integration of externally built plugins, leveraging a microfrontend pattern on the UI side via Module Federation v2 remotes loaded at runtime by the host shell (self-registering RBAC permissions, i18n labels, and API routes).
Led frontend migration from React 16 to React 18, implemented secure token-refresh flows, and integrated Labbook (LIMS).
Tech: React 18 • Spring Boot • Module Federation v2 • Labbook

🔸 Holding APP (Backend Developer & Team Lead)

Developed over 90% of the Spring Boot/Java/MySQL backend for a property sale/renting and auto rental platform.
Directed the Angular 19 frontend team, implementing Server-Side Rendering (SSR) for SEO and performance optimization.
Tech: Spring Boot • Angular 19 • MySQL • SSR

🔸 CSSO IAM (IAM Developer)

Developed an OAuth2 authentication single sign-on (SSO) system using Spring Security OAuth Authorization Server, Spring Boot, Kotlin, and MongoDB, integrating user authentication flows with a React JS frontend.
Tech: Spring Boot • Kotlin • MongoDB • React • OAuth 2.1

Also contributed to EPAL Exchange Pallet (Angular developer), Veritas SOL 2 (React component libraries), Token Creator (Mantine forms), and Scholarship (JPA Specifications).

🔧 Notable Projects

🎮 Hobbies

🎮 Video Games: eFootball, Yu-Gi-Oh! Master Duel
💻 Open Source: Coding, building developer tools, and experimenting with AI agents
📖 Anime & Manga: Huge fan of Japanese pop culture

Project	Description
📦 @nxgt/material	Modular React 19 + TypeScript component library built on shadcn/ui and Tailwind CSS 4, exporting 50+ rich components (Tiptap editor, PDF viewer, TanStack Tables) with multiple named entry points.
🔐 OAuth 2.1 Auth Server	Fully RFC-compliant OAuth 2.1 Authorization Server built from scratch in Hono, TypeScript, MongoDB, and Redis, featuring PKCE, Refresh Token rotation, and BullMQ event-driven notifications.
🖥️ GraphQL Federation Platform	GraphQL Federation v2 supergraph (Apollo Federation, Hive Gateway) with shared audit logs, DataLoader batching, and a custom Model Context Protocol (MCP) server enabling AI agents to query/mutate data.
🗃️ MongoDB Migration Module	Custom database migration tool for Spring Boot applications (inspired by Mongock) that dynamically scans, executes, and records schema migrations during startup.
📝 MongoDB Auditing Starter	Kotlin & Spring Boot WebFlux auditing module using Javers Core to track modifications on MongoDB collections via Spring Data lifecycle callbacks.
🛡️ GraphQL Fine-Grained Auth Directive	Custom GraphQL directive to enforce field-level authorization and role-based access control (RBAC) directly inside GraphQL schemas.