Juno Vale

Senior Engineer · Meridian Payments

Sep 2017 — Feb 2023 · Lisbon

• Settlement pipeline processing roughly 2M transactions a day
• Cut reconciliation defects by making retries idempotent at the boundary

• elixir
• payments
• reliability

Staff Engineer · Ledgerbeam

Mar 2023 — present · Porto (remote)

• 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

• elixir
• distributed-systems
• event-sourcing

Ledgerbeam

Mar 2023 — present · Site

• 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

• elixir
• event-sourcing
• distributed-systems

Backpressure in Practice

ElixirConf EU · May 2025

BSc Computer Science · University of Porto

Sep 2013 — Jun 2017