Talk
NIFs Without Tears
- Three rules that make a Rust NIF an ordinary engineering tradeoff
- Measured a dirty-scheduler violation live and watched latency collapse
Juno Vale
Distributed systems engineer. Ingestion pipelines and event-sourced inventory on the BEAM.
2025
Talk
Backpressure in Practice
- Four honest answers to an overloaded queue, and how to choose between them
- Why concurrency: is a policy setting wearing a performance costume
2024
Project
Tacto
- Terminal client for reading event streams live
- Renders a supervision tree next to the stream it is producing
2023
Position
Staff Engineer · Ledgerbeam
- Led the move from mutable stock levels to an event-sourced movement stream
- Rebuilt ingestion on Broadway; sustained a 40x burst without shedding orders
- Introduced property testing across the parsing and merging seams
Project
Ledgerbeam
- Event-sourced inventory for mid-size distributors
- Rebuilt stock projections as a fold over movements, deleting the nightly reconciliation job
- Ingestion pipeline sustained a 40x burst without shedding orders
2017
Position
Senior Engineer · Meridian Payments
- Settlement pipeline processing roughly 2M transactions a day
- Cut reconciliation defects by making retries idempotent at the boundary
2013
Education
BSc Computer Science · University of Porto
- Final year project: a consensus visualiser for teaching Raft
Open source
- simhash_ex author