Marcelo Dosko

Owns the reserve/capture path and the Service Bus consumers that keep settlement in sync. Hired into a squad that was still fighting duplicate payouts.

• Designed an idempotent capture API so client retries cannot double-charge.
• Introduced an outbox + Service Bus for ledger events; duplicate settlement tickets dropped sharply.
• On-call for payouts; wrote the runbooks for stuck transactions.
• Mentored two mid-level engineers on EF Core and SQL performance.

Dispatch and tracking backend for a regional logistics product used by 200+ operators. Started as the junior on a monolith and left owning the live-map service.

• Shipped the first tracking API and the worker that ingested GPS events.
• Cut live-map query time from ~1.2s to ~180ms (indexes + a Redis read path).
• Helped lift a monolith module onto a .NET service without a big-bang rewrite.
• Paired with ops on the first on-call rotation for the tracking stack.

Line-of-business web apps for local clients. Where he learned C# for real: CRMs, reporting, and the unglamorous SQL that keeps a shop running.

• Built and maintained ASP.NET MVC apps against SQL Server.
• Took support tickets through to production fixes, including data repairs.

Coursework in algorithms, databases, and distributed systems. Thesis on messaging patterns for unreliable networks, still the mental model he uses for Service Bus work.