Duarte Ribeiro
About MeSkillsExperienceProjects
Available to Work

Duarte Ribeiro

A Full Stack Developer with extra love for anything Backend and DevOps

hello@duarteribeiro.comSetúbal, Portugal

About Me

I’m a Full Stack Developer with over 5 years of experience building large-scale backend systems, real-time applications, and automation tools.

I’ve led the development of a moderation and security platform used by more than 35 million users across 19,000 communities, with a strong focus on scalability, performance, and reliability.

I primarily work within the TypeScript ecosystem (Node.js, Bun) and enjoy designing distributed systems and cloud infrastructure. My work often involves real-time architectures, high-availability systems, and integrating AI into practical, production-ready solutions.

Skills

Programming Languages

TypeScript

JavaScript

Python

SQL

Frontend & UI

React

Next.js

Tailwind CSS

shadcn/ui

Backend & Runtime

Express

Hono

Bun

WebSockets

OAuth 2.0

Databases & Storage

PostgreSQL

MySQL

MongoDB

SQLite

Cloudflare D1

ClickHouse

Cloud, Infrastructure & DevOps

Cloudflare Workers

Cloudflare Pages

Docker

CI/CD

Git

Monitoring

Backups

Analytics, Observability & Integrations

Stripe

PostHog

Sentry

Grafana

Langfuse

Experience

Full Stack Developer → Back-end / DevOps
Momentum One

Lisbon, Remote

August 2021 – December 2025

  • Led end-to-end development of a security and moderation platform, covering backend systems, real-time infrastructure, and user-facing interactions.
  • Designed and maintained scalable APIs and real-time systems using TypeScript and event-driven architectures.
  • Built user-facing features ensuring usability alongside system performance and reliability.
  • Architected and deployed cloud-native services using Cloudflare Workers, Pages, and distributed infrastructure, ensuring high availability and low latency.
  • Managed databases including schema design, migrations, and performance optimization.
  • Integrated third-party services including Stripe (payments), analytics, and AI-powered moderation systems.
  • Deployed and operated blockchain infrastructure, including node and validator management, focusing on reliability, synchronization, and system uptime in distributed environments.
  • Contributed to architecture and scalability decisions in collaboration with technical leadership.
https://momentum-one.io
Intern → Cluster IT Coordinator
Hotel Intercontinental Lisbon / Estoril

Lisbon / Estoril

March 2018 – September 2018

  • Provided technical support and maintained IT systems across multiple locations.
  • Managed servers, internal services, and network infrastructure (LAN, Wi-Fi, routers, switches).
  • Diagnosed and resolved technical incidents, ensuring system reliability and continuity.
  • Installed and configured hardware and software for operational environments.
https://www.iclisbonhotel.com

Projects

Sledgehammer App
Security and moderation application used by 19,000+ communities and 35+ million users.

Sledgehammer is a large-scale moderation and security platform designed to operate across thousands of online communities, handling real-time events and automation at significant scale.

I was responsible for the end-to-end development of the platform, covering backend systems, real-time infrastructure, automation pipelines, and user-facing interactions through Discord and Telegram.

On the backend, I designed and maintained scalable APIs and event-driven systems using TypeScript (Node.js and Bun), focusing on low-latency processing, reliability, and high-throughput workloads. The platform processes a continuous stream of events, requiring efficient handling of concurrency, fault tolerance, and system resilience.

In addition to backend systems, I also worked on user-facing features, including moderation workflows, command systems, and interaction flows (embeds, buttons, and automation triggers), ensuring a balance between usability and performance.

The system was built with a strong emphasis on:

  • Scalability and distributed architecture
  • Fault tolerance and high availability
  • Security and abuse prevention
  • Operational reliability under heavy load.

This project involved close collaboration on architectural decisions, infrastructure design, and long-term scalability strategies.

https://sledgehammer.app