Open to relocate · GMT+3

Hi, I'm Carlos Moreira

Software Engineer building scalable SaaS platforms and real-time systems. 5+ years in software, 15+ years in offshore oil & gas — I translate complex field operations into reliable, production-ready software.

Multi-tenant architectures · NestJS + Next.js + PostgreSQL · End-to-end delivery from architecture to VPS.

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Years in Software

15+

Years Offshore

SaaS Shipped

5k+

Servers Monitored

Brazil · Remote-firstAvailable for new projects

⚡ NestJS · Next.js

🛢️ 15y Offshore → Code

🔐 Multi-tenant SaaS

Shipped Products

Real projects. Real users.

Flagship Work

Two products I built from scratch

100% owned — product discovery, architecture, frontend, backend, DevOps and deployment.

FinTech · Wealth Management

Marina Planner

Live

Financial Dashboard for Wealth Consolidation

A full financial planning SaaS built from scratch for a private financial office. Consolidates clients investments across brokers, builds retirement scenarios, and automates performance reports. Delivered end-to-end — product discovery, architecture, frontend, backend, and deployment.

Replaced Excel-driven workflow with a live dashboard
Retirement simulator across multiple scenarios
Sold as a commercial product to a financial office

Next.jsNestJSTypeScriptPostgreSQLTypeORMTailwindCSSRechartsJWTDocker

HealthTech · SaaS

Clinical SaaS

Multi-tenant Clinic Management Platform

100% owned multi-tenant SaaS for clinics and healthcare practices. Patient records, scheduling, TUSS/CID coding, multi-procedure billing and role-based access for doctors, admins and staff. Built with real-world compliance (TISS) and operational workflows in mind.

Multi-tenant architecture with strict data isolation
TUSS + CID-10 tables fully integrated
Role-based flows: admin-as-doctor, multi-procedure billing

Next.jsNestJSTypeScriptPostgreSQLTypeORMTailwindCSSWebSocketsDockerCI/CD

More Projects

Other SaaS & MVPs

A selection of platforms, ERPs and MVPs shipped to production across multiple segments.

Mobility · ERP

LocMoto

Motorcycle Rental ERP

Multi-tenant SaaS ERP managing 10+ franchises and 50+ simultaneous users. Vehicle fleet, bookings, inventory, maintenance, traffic fines, financial ledger and clients — all in one platform.

ReactNestJSTypeScriptNext.jsPostgreSQLJWT

Code Live

HealthTech

ClintIA

Clinical Data & Exams Platform

Multi-tenant clinical platform focused on exam management, booking flow and patient records with AI-assisted analysis.

ReactExpressTypeScriptPostgreSQLNode.jsTailwindCSS

Code Live

Retail · Procurement

CotaRadar

Quotation Engine for Drugstores

Quotation system managing 6 drugstores: compare suppliers, generate best-price lists and export. Reduced costs by 30% and optimized purchasing time by 150%.

ReactNodeJSExpressJSMySQLTailwindCSS

Live

Productivity

Shopping List

Collaborative List with Supplier Matching

Real-time shopping list app with supplier management — create, edit, export lists and auto-generate the cheapest list from supplier feeds.

ReactNodeJSExpressJS 5MySQLTailwindCSS

Code

Personal Finance

AppFree

Daily Budget & Expense Tracker

Mobile-first budgeting app. Users set a daily spend goal, log transactions and see live balance for the day.

ReactExpressJSPostgreSQLTypeScriptNode.js

Live

Experience

From offshore rigs to production code

2024 — Present

Full Stack Engineer — Senior

HESEA Technology · Remote

Leading design and delivery of multi-tenant SaaS platforms end-to-end, from architecture to production.

· Multi-tenant SaaS with NestJS + Next.js + PostgreSQL
· Scalable APIs and modular frontend architectures
· CI/CD pipelines on VPS with reverse proxy and security hardening

NestJSNext.jsPostgreSQLTypeORMDockerGitHub Actions

2022 — 2024

Full Stack Engineer — Mid-level

Santander (F1RST Digital) · Brazil

Built integration APIs and observability tooling for enterprise-scale banking infrastructure.

· Observability across 5,000+ servers (Dynatrace, Zabbix, ServiceNow)
· Integration APIs with Java 11 + Node.js and AngularJS front-ends
· Automation dashboards reducing operational overhead

Java 11Node.jsAngularJSDynatraceZabbix

2020 — 2022

Backend / Full Stack Developer

HESEA · Remote

Built and refactored legacy systems while delivering production features across multiple SaaS products.

· Scalable APIs and legacy refactors (PHP, WordPress, JavaScript)
· Performance and reliability improvements
· Production features for multiple SaaS platforms

PHPWordPressJavaScriptMySQL

2011 — 2020

Cementing Supervisor / Offshore Engineer

Schlumberger · Africa · South America · Europe

A decade leading high-risk ultra-deepwater operations — the operational backbone behind how I build industrial software today.

· Mission-critical equipment and real-time decision making under pressure
· Coordinated multidisciplinary teams and client operations worldwide
· Deep expertise in operational workflows, maintenance and field logistics

Offshore OpsReal-Time SystemsField LogisticsSafety Critical

About Me

Engineer with an operational backbone

I spent a decade leading high-risk offshore operations in ultra-deepwater before fully transitioning into software. That background shapes how I design systems today: reliability-first, failure-aware, and built around how the business actually operates — not how we'd like it to.

End-to-End Delivery

From discovery and architecture to deployment on VPS with CI/CD. I build the whole stack, not just parts of it.

Multi-tenant Systems

Data isolation, role-based access, per-tenant configuration — core to every SaaS I ship.

Translating Operations into Software

15+ years in offshore oil & gas give me an unusual edge: I model software around how the work actually happens in the field.

Pragmatic Architecture

Modular, boring where it should be boring. I favor readable code and production-ready patterns over clever abstractions.

Core Skills

Backend

Node.jsNestJS (Fastify)ExpressREST APIsWebSocketsJWTTypeORM

Frontend

ReactNext.jsTypeScriptTailwindCSSFramer MotionAngularJS

Database

PostgreSQL (multi-tenant)MySQLAmazon RDS

DevOps

VPSGitHub ActionsPM2DockerReverse ProxySecurity Hardening

Observability

ZabbixDynatraceSentryServiceNow

Currently Leveling Up

Advanced Kubernetes & cloud-native patterns (EKS / GKE)
Event-driven architectures (Kafka, RabbitMQ)
AI/LLM integration into SaaS workflows
Observability at scale (OpenTelemetry)

Industry Segments

SaaS Multi-tenant

Deep

HealthTech

Strong

FinTech / Wealth

Strong

Industrial & Offshore

Native

Mobility / Rental ERP

Shipped

Retail & Procurement

Shipped

Coding Style

TypeScript-first, strict mode everywhere
Prefer composition over inheritance
Small, reviewable PRs over big-bang merges
Write code that reads like the business domain
Production mindset: logging, error boundaries, migrations from day one

Fix root causes, not symptomsDesign for failure — offshore taught me thatBoring tech until you need sharp toolsShip, measure, then iterate

Let's Talk

Got a product to build?

Open to senior full-stack roles, SaaS partnerships and industrial software challenges.

Direct channels

Fastest way to reach me.

cesmoreira90@hotmail.com
+55 22 99779-4401
Brazil · Open to relocate (GMT+3)