Duarte Nunes, Developer in Campinas - State of São Paulo, Brazil
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Duarte Nunes

Verified Expert  in Engineering

Distributed Systems Developer

Campinas - State of São Paulo, Brazil
Toptal Member Since
July 4, 2020

Duarte has been working as a software developer for over 10 years, with the bulk of his experience in infrastructure software, mainly distributed and low-latency software. Recently, he was a distinguished engineer at ScyllaDB, building the world's fastest NoSQL database, and then the CTO of vectorized.io, writing a drop-in replacement for Apache Kafka with 10x the throughput. Duarte has most recently co-founded a company using web technologies like React and GraphQL.


Amazon Web Services (AWS), Rust, GraphQL, Bazel, Go, TypeScript
Apache Kafka, C++
Apache Cassandra, Seastar Framework, C++




Preferred Environment

Visual Studio Code (VS Code)

The most amazing...

...thing I've developed is an algorithm for having materialized views in a distributed data store.

Work Experience


2020 - PRESENT
  • Created a personal project using a serverless architecture on AWS. The back end is Lambdas written in Go and the front end is a React SPA, connected by a GraphQL API. Infrastructure is defined as code using the AWS CDK.
  • Defined and implemented a serverless architecture based on event sourcing, using AWS AppSync, DynamoDB, DynamoDB streams, S3 and Lambda.
  • Implemented a custom-made component system for the front end, available at http://storybook.dev.uma.ni.
Technologies: Amazon Web Services (AWS), Rust, GraphQL, Bazel, Go, TypeScript

Chief Technology Officer

2019 - 2019
  • Developed the initial infrastructure for Redpanda, a Kafka API-compatible, transactional, and safe queue, intended for massive data streams. It's built on top of the Seastar project, an advanced C++ framework for high-performance server applications.
  • Built the storage module, a distributed append-only log.
  • Developed an implementation of the Raft algorithm with two important characteristics: each node implemented many Raft instances and coalesced heartbeats; the Raft log was the storage log itself.
Technologies: Apache Kafka, C++

Software Engineer

2016 - 2019
  • Contributed to ScyllaDB, a high-performance NoSQL database compatible with Apache Cassandra, optimized for modern hardware, and the underlying Seastar project, an advanced C++ framework for high-performance server applications.
  • Developed several cross-cutting features including range tombstones, thrift support, materialized views, and Raft and lightweight transactions.
  • Reviewed contributions to multiple components of the system, enforcing correctness and architectural constraints.
Technologies: Apache Cassandra, Seastar Framework, C++

Software Engineer

2013 - 2016
  • Worked as a software engineer on MidoNet, a virtual network platform for IaaS clouds. Focused on the architecture and implementation of the core network controller, a distributed and highly concurrent software written in Java and Scala.
  • Improved performance and scalability (e.g., measuring and accelerating the packet processing pipeline, reducing memory footprint, scaling the on-ramp and off-ramp gateways, re-write of the userspace NetLink library, and more).
  • Defined and implemented cross-controller features, namely the distributed flow state management algorithm.
Technologies: Docker, OpenStack, Apache Cassandra, Scala, Java


Scylla is NoSQL database compatible with Apache Cassandra, with 10x the throughput and 100x lower latency. It's written in C++, leveraging the Seastar framework for asynchronous network, file, and inter-core programming.
2005 - 2009

Bachelor's Degree in Computer Science

Instituto Superior de Lisboa - Lisbon, Portugal


React, Node.js


AWS AppSync, Bazel


C++, Java, TypeScript, Go, Scala, Rust, GraphQL


Asynchronous Programming


AWS Lambda, Linux, Apache Kafka, Amazon Web Services (AWS), OpenStack, Docker, Visual Studio Code (VS Code)


NoSQL, Distributed Databases, Databases, Amazon DynamoDB, Amazon S3 (AWS S3)


Seastar Framework


Apache Cassandra, Full-stack, Distributed Systems, Software Architecture, Storage

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