Guilherme Andrade

Software engineer based in Lisbon, specialising in Erlang and Elixir. I've spent most of my career building distributed backend systems — currently at Dash Games, previously a decade at Miniclip, and briefly before that as a sysadmin at a university computer lab.

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Open source

A selection of libraries I maintain, mostly for the BEAM ecosystem:

Project	Description	Stars
locus	MMDB reader for Erlang/Elixir — IP geolocation and ASN lookup	⭐ 121
sqids-elixir	Official Elixir port of Sqids — short unique IDs from numbers	⭐ 94
aequitas	Fairness regulator and rate limiter	⭐ 50
backwater	Intercluster RPC for Erlang and Elixir	⭐ 48
taskforce	On-demand worker pools for parallelizable tasks	⭐ 43
maestro	Pool of pools	⭐ 31
deigma	Event sampler	⭐ 24
tls_certificate_check	CA store and partial chain handler for TLS	⭐ 23

→ full list

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Upstream contributions

erlang/otp

• ets:select_replace/2 — matchspec-based row replacement in ETS tables
• math:fmod/2 — floating-point modulo BIF
• enif_hash — hashing arbitrary terms from NIF code
• Cryptographically strong random number generation via rand plugin
• zlib inflation dictionary extraction
• Various fixes and documentation improvements

Erlang/Elixir ecosystem

rebar3, rebar3_hex, rebar3_hank, ex_doc, exile, hackney, certifi, and others

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Technologies

Languages — Erlang, Elixir, SQL; some C, C++, JavaScript, Python, Rust over the years

Runtime / frameworks — OTP, Cowboy, Phoenix (LiveView), Ecto, Protocol Buffers

Infrastructure — GCP (Cloud Run, Cloud SQL, GCS, Secret Manager, IAP, Workload Identity), Terraform, Docker, OpenTelemetry, GitHub Actions

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This profile is a work in progress.