Marcos Villalba
Senior Software Engineer
Senior Engineer with 5+ years of experience leading teams and shipping production systems at scale. Architected a national election platform processing 1.3M+ events under live conditions. Currently building an AI-powered compliance verification platform with hybrid RAG and agentic tool-use loops. GCP Certified with deep expertise across Python, .NET, React, and cloud-native infrastructure.
Work Experience
Remote (US). Working with React, .NET 9, and Azure.
Key Highlights:
- Cut login latency by 60% by refactoring legacy Redux Saga authentication to Context API + Azure B2C.
- Accelerated roadmap by 1 month by building a strongly-typed Databricks query engine with automated serialization, simplifying query code and improving maintainability.
Remote (US). Promoted to Team Lead in 8 months, leading a 6-person cross-functional team.
Key Highlights:
- Architected a high-concurrency Web Push Notification engine using .NET Hosted Services, integrating AWS EventBridge Scheduler to handle precise, timezone-aware delivery for 350+ hospital partners.
- Ensured the stability and reliability of a $1M+/month payment pipeline integrating Stripe, Dwolla, and PandaDoc in Django.
- Managed production infrastructure via Terraform on GCP.
- Established engineering standards for React PWA + .NET Backend, improving code consistency and review efficiency across the team.
Part-Time Contractor. Led emergency recovery of national election platform during live vote counting.
Key Highlights:
- Redesigned failing single-worker architecture to distributed micro-batching system (18 workers, 1K event batches) in 20 minutes, ensuring complete data capture across 1.3M+ events.
- Built sub-second fuzzy search across 4.7M voter records using Levenshtein Distance + Span memory optimization.
- Delivered end-to-end Mobile App, Backend API, and Analytics Dashboard in 4 months under strict election deadlines.
Shipped 6+ production products including real-time Grocery Delivery and Cattle Auction platform. Dual-hatted as PM (2022+) managing stakeholders.
Key Highlights:
- Developed Flutter mobile app with WebSockets for real-time updates.
- Built e-commerce API in .NET 6 with C#.
- Managed client stakeholders while maintaining hands-on ownership of critical backend features.
Freelance Consultancy Work
Compliance verification platform with custom workflow orchestration, hybrid RAG pipeline, and agentic tool-use loops for engineering standards.
Highlights:
- Architected a custom workflow engine with parallel fan-out execution and real-time SSE progress streaming.
- Designed a recursive compliance architecture with multilingual translation (Gemma), parallel investigator spawning, and a multi-stage feedback loop (decompose → DeepSeek per-claim validation → synthesizer retry → coherence review).
- Built a hybrid RAG pipeline (dense + sparse + RRF fusion + cross-encoder reranking) with multilingual query translation across EN/ES/PT.
- Engineered a ReAct agentic loop with 5 domain tools (Sympy formula engine, CPM scheduler, XLSX cell-level access).
Offline-first meditation app with personalized audio generation using Google Chirp.
Highlights:
- Built an offline-first meditation app with personalized audio generation using Google Chirp.
- Engineered a Dynamic Context Pipeline to inject user goals and versioned 'Brain' prompts via feature flags.
Skills & Technologies
Career Timeline
2026
Engineering Intelligence SaaS
Client Project
2025
Senior .NET Developer
Kubikware
Mente Imparable (GenAI PWA)
Client Project
2024
Team Lead & Senior .NET Developer
Forty AU
2022
Lead Engineer & Architect
Election Statistics Platform (Concertación)
2021
Technical Lead & PM
Creadores