SOFTWARE ENGINEER / TECH LEAD/PORTFOLIO 26—

I TURNCOMPLEXITYINTO SYSTEMSTHAT SELL.✳

Hey, I'm Guilherme.

I build software, connect systems and automate operations. I work across backend engineering, integrations, AI and digital products — helping companies launch serious solutions that actually work.

AVAILABLERetrato de Guilherme Ziggiatti
Guilherme ZiggiattiBackend · Automação · IA · Integrações
guilhermehakim19@gmail.com
OPEN FOR PROJECTS
Open to projects, partnerships and opportunities
SCROLL TO EXPLORE
23°33' S / 46°38' W • WORLDWIDE
BACKEND ENGINEERINGAI & AUTOMATIONAPI INTEGRATIONFULL-STACK DEVELOPMENTSYSTEM ARCHITECTUREPROBLEM SOLVING

Projects with
impact.

A selection of public work, live projects and private enterprise case studies that reflect how I build.

01 / LIVE CASEPUBLIC PROJECT / LIVE

Production institutional website

Numeric Brasil Website

Creation and evolution of Numeric's institutional website, focused on digital presence, credibility and a premium browsing experience. A real live project built for business impact.

Next.jsTypeScriptUI / UXDeploy
View website
02 / PRIVATE CASEPROFESSIONAL CASE · PRIVATE CODE

Operational AI, agents and OpenTelemetry

Jarbas + Observability Stack

Corporate project involving agent orchestration, telemetry, monitoring, workflow automation and observable infrastructure to support smarter and more reliable operations.

PythonOpenTelemetryDockerAI Agents
03 / PRIVATE CASEPROFESSIONAL CASE · PRIVATE CODE

RPA, certificates, ERP and workflows

Enterprise Automation Ecosystem

A set of enterprise automations and integrations involving an A1 Certificate Worker in C#, SIGEP RPA, Numeric Checklist, eKontrol SPA, n8n workflows and ERP-connected processes.

C# / .NETn8nRPAERP Integration

Public projects & live work.

Some of the strongest public work and demonstrations I can openly showcase.

View GitHub

Private & enterprise work.

Strategic projects delivered in corporate environments, shared at a high level due to confidentiality.

01private code

Jarbas AI

Agent orchestration, provider fallback, autonomous operations and smart context.

Python · LLM Ops · Routing
02private code

Observability Stack

OpenTelemetry, Prometheus, Grafana, Alertmanager and environment monitoring.

OTel · Grafana · Prometheus
03private code

A1 Certificates Worker

Automation for generation and auditing of A1 certificates in C#.

C# · Worker · PKI
04private code

SIGEP RPA

OCR workflows, document analysis and operational processing via RPA.

RPA · OCR · Playwright
05private code

Numeric Checklist & eKontrol

Internal tools, operational checklists and ERP-facing integrations.

Internal Tools · ERP · APIs
06private code

n8n Automations

Process automation using webhooks, APIs, SharePoint and Microsoft 365.

n8n · Power Automate · Webhooks

BEYOND
CODE.
DELIVERY.

I'm a developer who likes to understand the whole picture: the business pain, the operation, the architecture and the final delivery.

I work across backend engineering, enterprise integrations, automation, AI and digital products. My goal is to build solutions that are useful, reliable and commercial — including for companies looking for someone who can turn ideas into shipped projects.

GZ.Software with intention. Engineering with results.
3+years of experience
03languages
B2Bbusiness + product mindset
BASE / SÃO PAULO, BRAZILWORKING / GLOBAL, REMOTE & PROJECT-BASEDEDUCATION / BUSINESS ADMINISTRATION · MACKENZIEPT NATIVE · EN ADVANCED · ES INTERMEDIATE

TOOLS
ARE THE MEANS.
RESULTS ARE THE GOAL.

From API design to deployment, I choose technology to solve business problems. These are my core areas.

01 / 04

Backend & APIs

The heart of the application

PythonFastAPINode.jsC# / .NETREST & SOAPDjango
02 / 04

Frontend & Product

Experiences that make sense

TypeScriptNext.jsReactTailwind CSSAngularUI Engineering
03 / 04

Data & Automation

Less friction, more flow

PostgreSQLSQLn8nETL & OCRAI AgentsWebhooks
04 / 04

Infrastructure

Delivery that stays online

DockerLinuxGit & CI/CDNginxObservabilityCloud / VPS

ONE JOURNEY,
MANY CONNECTIONS.

Technical experience combined with operational vision, teamwork, B2B exposure and closeness to real outcomes.

CURRENT — 01

Tech Lead / Software Engineer

Numeric · enterprise platforms & product engineering

Technical leadership, full-stack development, ERP and API integrations, automation, data pipelines, applied AI and internal platform evolution.

PREVIOUS — 02

Digital Operations & Product Support

Nonstop

Direct work with clients and B2B partners, product support, training, platform improvements and the bridge between technology and operations.

2026 — 03

Business Administration

Mackenzie Presbyterian University

Business Administration degree connecting strategy, processes and product thinking with software development.

DO YOU HAVE AN IDEA? A PRODUCT? A CHALLENGE?

LET'S CLOSE
SOMETHING BIG.

If you need a strong website, integrations, automation, backend systems, applied AI or someone to bring a serious project to life, feel free to contact me. I'm open to freelance work, partnerships, consulting and new opportunities.

guilhermehakim19@gmail.com
Send me an email