I'm a Senior Customer Success Engineer with 20+ years in technology and 9+ years working with enterprise cybersecurity environments.

My work sits at the intersection of engineering, automation, APIs, AI, infrastructure, security and customer experience.

I design and build tools, integrations and applications using Python, PowerShell, Shell Scripting, REST APIs, Docker and AI-assisted development workflows.

My engineering philosophy is simple:

Problem → Investigate → Understand → Build → Automate → Integrate → Improve

• 🏢 Enterprise environments reaching ~100K managed endpoints
• 🔎 Deep troubleshooting, log analysis and Root Cause Analysis
• 🐍 Automation and tooling with Python
• 💙 Windows engineering and automation with PowerShell
• 🐧 Linux automation with Bash / Shell Scripting
• 🔌 REST APIs, OpenAPI, OAuth, tokens and webhooks
• 🤖 AI-assisted engineering with Claude, Codex and ChatGPT
• 🐳 Self-hosted environments using Docker, Linux and Nginx
• 🛡️ Cybersecurity, EDR/XDR, SIEM, PKI and enterprise infrastructure
• 🔬 Lab-first, evidence-driven troubleshooting

🌎 Brazil · Portuguese 🇧🇷 · English 🇺🇸 · Spanish 🇪🇸

AI is part of my engineering workflow for building, debugging, reviewing and evolving software.

I use AI-assisted workflows for:

Software Development · Prototyping · Debugging · Refactoring · Architecture · API Integrations · Technical Research · Documentation · Testing · Log Analysis

I also integrate AI capabilities programmatically into applications and automation workflows.

OpenAI · Claude · Groq · Ollama · LLM APIs · Tool Calling · RAG · AI Agents

Application
    │
    ├──► LLM / AI APIs
    ├──► Tool Calling
    ├──► External APIs
    ├──► Data & Memory
    └──► Automation

A major part of my projects involves connecting systems, consuming external services and automating workflows through APIs.

I work with:

• 🔐 Authentication, API keys, OAuth and access/refresh tokens
• 💳 Payment APIs and transaction workflows
• 🪝 Webhooks and event-driven integrations
• 📱 Social network and Instagram APIs
• 🤖 LLM and AI APIs
• 🗺️ Maps, travel and external data services
• 📅 Calendar and productivity integrations
• 🛡️ Enterprise and security APIs
• 📦 JSON processing and data transformation
• ⚠️ Error handling, retries and API diagnostics

                     ┌── AI / LLM
                     ├── Payments
                     ├── Social Networks
Application ── API ──┼── Maps / Data
                     ├── Productivity
                     └── Enterprise Systems
                              │
                              ▼
                     Process / Automate

My primary language for building automation, APIs, diagnostic utilities, parsers, security tools and backend services.

Python 3 · FastAPI · REST · CLI Tools · Log Processing · Security Automation

Used extensively for Windows administration, diagnostics, enterprise automation and REST API integrations.

PowerShell 5.1+ · Windows · REST APIs · Administration · Diagnostics

Used for Linux administration, deployment, diagnostics, server automation and container environments.

Bash · Linux · Automation · Deployment · Diagnostics

These are some of the projects that best represent how I approach engineering, automation, integrations and troubleshooting.

A personal automation platform combining AI, natural language, voice, messaging, scheduling and external APIs into a self-hosted environment.

What started as task automation evolved into a modular platform capable of connecting different services and interfaces.

• 🤖 AI / LLM integration
• 💬 Natural-language commands
• 🎙️ Voice input and transcription
• ✈️ Telegram bot and voice-message processing
• 📅 Google Calendar integration
• ⏰ Tasks, reminders and scheduled actions
• 🔌 External API integrations
• 🔐 Private connectivity through Tailscale
• 🐳 Containerized infrastructure

Stack

Python FastAPI PostgreSQL Redis Celery Docker Nginx Tailscale Telegram API Google APIs LLM APIs

Status: 🟢 Active Development

A platform designed to simplify and organize the publishing, versioning and distribution of Android APK packages.

Instead of relying on manual file distribution, the project provides a structured workflow for managing application releases.

• APK publishing
• Version management
• Release organization
• Application distribution
• Metadata management
• Administration workflows
• Automation

Engineering Areas

Application Distribution · Release Management · Automation · Web Development · Developer Tools

Status: 🟢 Active Project

WIT HUB is the central platform for my IT tools, support utilities, engineering projects and technical content.

It acts as an umbrella for several tools created to solve practical problems involving technical support, infrastructure, automation and security.

• Support Engineering
• Diagnostic utilities
• Automation
• System administration
• Security tools
• Technical knowledge
• Engineering experiments

🌐 wit-it.com.br

A personal finance management and analysis platform designed to transform financial data into useful information for decision-making.

The project goes beyond basic expense tracking, exploring financial analytics, automation, dashboards and integrations.

• Financial data organization
• Personal financial analytics
• Dashboards
• Transaction processing
• Data visualization
• Automation
• External APIs

Engineering Areas

FinTech · Analytics · APIs · Automation · Data Processing

Status: 🟢 Active Development

A social media management platform initially focused on Instagram account management and automation.

The project explores real-world challenges involving external APIs, authentication, tokens and automated content workflows.

• Instagram integrations
• Social media APIs
• Authentication
• Access and refresh tokens
• API consumption
• Account management
• Content workflows
• Automation

Engineering Areas

REST APIs · OAuth · Tokens · Social APIs · Automation · Integration Engineering

Status: 🟢 Active Development

A family of tools designed around one principle:

Collect the right evidence, reduce noise and make troubleshooting faster.

These projects reflect one of the strongest areas of my engineering background: investigating complex environments through logs, operating-system data, automation and structured diagnostic evidence.

Linux auditing and diagnostic utility designed to automate the collection and organization of relevant system information.

Linux System Inspection · Services · Processes · Networking · Security · Configuration · Diagnostics

Linux Bash Shell Scripting System Administration Automation

Windows auditing and diagnostic utility designed to automate system inspection and evidence collection during technical investigations.

Windows Assessment · Services · Processes · Networking · Configuration · Security · Diagnostics

PowerShell Windows Automation System Administration Diagnostics

Windows Event Log investigation and analysis tool designed to transform large volumes of event data into useful diagnostic evidence.

• EVTX processing
• Windows Event Logs
• Event filtering
• Timeline investigation
• Security events
• Troubleshooting
• Diagnostic analysis

Python EVTX Windows Event Logs Log Analysis Security

Scripts and utilities designed to process, normalize and analyze complex diagnostic logs.

        RAW LOGS
            │
            ▼
         Parsing
            │
            ▼
      Normalization
            │
            ▼
   Filter / Correlate
            │
            ▼
    Relevant Evidence
            │
            ▼
 Troubleshooting / RCA

• Large diagnostic log processing
• Relevant event extraction
• Timestamp normalization
• Error and warning identification
• Regex and pattern detection
• Multiple log-source correlation
• Diagnostic evidence preparation
• RCA assistance

Python PowerShell Regex JSON CSV Log Parsing Automation

ChatGPT · Claude · Codex · OpenAI · Groq · Ollama · LLM APIs · RAG · Tool Calling · AI Agents

REST · OpenAPI · OAuth · API Keys · Tokens · Webhooks · JSON · External APIs

FastAPI · Docker · Docker Compose · PostgreSQL · Redis · Celery · Nginx · Tailscale

Linux · Windows Server · macOS · Active Directory · DNS · DHCP · Networking · PKI

Endpoint Security · EDR · XDR · MDR · SIEM · Syslog · Incident Analysis · Root Cause Analysis

AWS · Terraform · LocalStack · Infrastructure as Code · CI/CD

My projects complement a professional background built around solving complex technical problems in large enterprise environments.

Customer / Problem
        │
        ▼
 Collect Evidence
        │
   ┌────┼─────┐
   ▼    ▼     ▼
 Logs  APIs  Systems
   │    │     │
   └────┼─────┘
        ▼
 Lab Reproduction
        │
        ▼
 Root Cause Analysis
        │
   ┌────┴────┐
   ▼         ▼
Product   Engineering
   │         │
   └────┬────┘
        ▼
     Solution

Experience includes:

• Enterprise environments reaching ~100K endpoints
• Severity 1 incident ownership
• Deep troubleshooting
• Root Cause Analysis
• Log and trace analysis
• Lab reproduction
• Technical escalations
• Customer-facing engineering
• Product and Engineering collaboration
• Technical presentations and demos
• Documentation and knowledge transfer

My projects generally fall into three engineering areas:

┌─────────────────────────────┐
│      PRODUCT ENGINEERING    │
├─────────────────────────────┤
│ CesarOS                     │
│ APK Publisher               │
│ WIT Fin                     │
│ WIT Social                  │
└─────────────────────────────┘

┌─────────────────────────────┐
│          PLATFORM           │
├─────────────────────────────┤
│ WIT HUB                     │
└─────────────────────────────┘

┌─────────────────────────────┐
│   DIAGNOSTIC ENGINEERING    │
├─────────────────────────────┤
│ WIT Linux Audit             │
│ WIT Windows Audit           │
│ WIT EVTX                    │
│ Log Parser Toolkit          │
└─────────────────────────────┘

Different projects. Same philosophy:

Build tools for real problems. Automate what repeats. Integrate what is isolated. Make troubleshooting reproducible.

🎓 Executive MBA — FIAP 🎓 Technologist Degree — Computer Networks 🛡️ ISC2 Certified in Cybersecurity (CC) ☁️ CompTIA Cloud Essentials+ 🔐 Multi vendor Technical Certifications*

I'm particularly interested in:

AI Engineering · Automation · APIs · Developer Tools · Cloud · Cybersecurity · Customer Engineering

🌐 WIT HUB: wit-it.com.br 💼 LinkedIn: Cesar Romani

cesar@lab:~$ solve --next-hard-problem
> ready_