Rafael Dantas Justo

Experience

1. Teamwork.com Cork, Ireland · since 2018

   • Principal Software Developer 2022 – now

     • Leading the Teamwork.com MCP server, which connects AI assistants to Teamwork, and the Go SDK beneath it.
     • Built an internal generative AI tool that answers questions from public and internal documentation.
     • Built a generic reporting system with advanced SQL, RabbitMQ and Elasticsearch, and tried out AWS Redshift for it.
     • Built cloud development environments with vCluster, DevSpace and Kubernetes. They led to automated per-PR environments and isolated test pipelines.
     • Worked on R&D with Debezium, Kafka, ksqlDB and Flink, and started the Yoxel integration for Google Calendar.

   • Senior Software Developer 2018 – 2021

     • Built the new Teamwork Projects API in Go.

2. NIC.br São Paulo, Brazil · 2007 – 2018

   • Senior Software Engineer

     • Worked on the NIC.br DNS server, including DNSSEC extensions and HSM communication.
     • Maintained the .br registry system and DNS publication, and built the Registro.br payment system.
     • Wrote C/C++, Go and Python on Linux and FreeBSD.
     • Gave talks and tutorials on DNS and security at national and international events. Member of the LACTLD technical working group.

3. Geologística São Paulo, Brazil · 2005 – 2007

   • Trainee

     • Built web applications for digital maps (georeferencing) in C# and ASP.NET.

Open source

Small, focused Go libraries that do one thing well, plus some tools.

• teamwork/mcp

  Model Context Protocol server for Teamwork.com. My main focus right now.

  Go · MCP · AI

• redigomock

  Mock library for unit testing code that uses redigo, the Redis client for Go. My most-starred project.

  Go · Redis · Testing

• dnstree

  Iterative DNS resolution drawn as a tree, with latency, origin AS and DNSSEC state on every hop.

  Go · DNS · Live demo

• teamwork-ai

  Agentic service that reads Teamwork.com tasks and assigns them by skill and job role.

  Go · LLMs

• goe2ee

  End-to-end encryption library for Go.

  Go · Crypto

• dnsdisco

  Service discovery over DNS SRV records.

  Go · DNS

• shelter

  Validates domains periodically and alerts on DNS or DNSSEC misconfiguration.

  Go · DNSSEC

• anicetus

  A way to deal with the thundering herd problem.

  Go · Distributed systems

• gomaxscale

  Change-data-capture consumer for MariaDB MaxScale.

  Go · CDC

• gocnab

  (Un)marshaler for CNAB, the Brazilian banking file formats.

  Go · Encoding

All repositories on GitHub →

Toolbox

• Go
• Python
• C / C++
• MCP & LLM agents
• Kubernetes
• Kafka
• RabbitMQ
• Redis
• Elasticsearch
• MariaDB
• AWS
• DNS / DNSSEC
• EPP