Marcos Villalba
Senior Software Engineer | .NET / Backend / Cloud
Senior software engineer and Google Cloud Professional Cloud Architect with 5+ years building production .NET/backend and cloud systems, including US consultancy work since January 2024. Led a 6-person team at FortyAU, delivered notification infrastructure for 350+ partner organizations, and stabilized the Concertación Nacional election-results platform that processed 1.3M+ vote updates.
Work Experience
Remote (US). Working with .NET, React, Azure, and Databricks.
Key Highlights:
- Migrated authentication to Azure B2C with custom policies and streamlined the client authentication flow.
- Made cross-system event ingestion idempotent by deriving internal UUIDv8 IDs from stable federated IDs, so duplicate and out-of-order create events upsert to the same mapped entity.
- Built a strongly typed .NET query builder over the Databricks SQL API, reducing query-construction errors for analytics features.
Remote (US). Promoted to Team Lead after 8 months, leading a 6-person cross-functional team.
Key Highlights:
- Promoted to Team Lead after 8 months; led a 6-person cross-functional team and owned product scope, releases, acceptance criteria, sprint priorities, and direct client communication.
- Built a .NET background task runner with bounded concurrency, a backpressure queue, and graceful shutdown for time zone-aware notification delivery to 350+ partner organizations.
- Built a Terraform-managed GCP email pipeline (Cloud Scheduler to Cloud Tasks) to generate PandaDoc contracts asynchronously; supported Dwolla payment ledger reconciliation workflows.
Direct part-time contract. Stabilized a national election-results platform during live vote counting.
Key Highlights:
- Partitioned a failing single-worker sync into 18 department-specific workers, processing 1.3M+ vote updates.
- Built fuzzy-matching utilities using Levenshtein distance and name-token scoring to query and validate voter records.
- Owned the four-month backend API and analytics dashboard build end to end as the sole engineer under election deadlines.
Joined as a developer and was promoted into technical leadership in 2022. Shipped 6+ production products including a real-time grocery delivery app and cattle auction platform.
Key Highlights:
- Owned client discovery, scope, and end-to-end delivery while staying hands-on across backend features.
- Led delivery of a real-time grocery delivery app (Flutter, WebSockets) and a cattle auction platform (Blazor/.NET) through launch.
- Translated client needs into shipped web and mobile software across 6+ custom products.
Freelance Consultancy Work
Independent prototype that explores turning unstructured project documents and format exemplars into reviewable spreadsheets and reports with formula traces and source links.
Highlights:
- Prototyped a hybrid RAG pipeline (dense/sparse search + reranking) supporting multilingual query translation for engineering project documents.
- Built an experimental workflow for compiling unstructured documents into reviewable spreadsheets and reports with automated formula tracing and source citations.
- Designed a prototype document ingestion service (FastAPI + Cloudflare R2) featuring an automated GPU-based OCR pipeline on Modal for scanned files.
Personal prototype for an offline-first meditation app with personalized audio generation using Google Gemini.
Highlights:
- Prototyped an offline-first meditation app with personalized audio generation using Google Gemini.
- Engineered a Dynamic Context Pipeline to inject user goals and versioned 'Brain' prompts via feature flags.
Skills & Technologies
Career Timeline
2026
Engineering Intelligence (Solo AI Prototype)
Client Project
2025
Senior .NET Developer
Kubikware
Mente Imparable (GenAI PWA Prototype)
Client Project
2024
Team Lead & Senior .NET Developer
FortyAU
2022
Full-Stack Engineer
Concertación Nacional (Paraguay) - Election Results Platform
2021
Technical Lead & Full-Stack Developer
Creadores