Remote-only roles as AI Engineer, Senior Backend Engineer or Senior Full-Stack Engineer, working as a contractor (B2B through my own company). Based in Fortaleza, Brazil (UTC-3) with full overlap with US business hours. Available to start in 2 weeks.
Looking for a job
Alex Felix
@alexfelix
Senior AI Engineer at VILT who built Atlas AI Agent Core Platform, automating 30% of support tickets.
BrazilWhat I'm looking for
At VILT, I architected the Atlas AI Agent Core Platform, which automated 30% of support tickets. I built its multi-agent workflows with Python, FastAPI, and LangGraph, and developed evaluation tests to catch silent regressions before release.
I also engineered the platform’s RAG retrieval architecture with PostgreSQL and pgvector, reducing query latency by 40%, and integrated more than 10 MCP servers to connect agents with enterprise tools and data.
Through Flui Solutions, I worked as a founding engineer on client engagements, taking early-stage AI platforms from prototype to production. I architected multi-tenant AWS systems and production LLM workflows, including model routing and caching that reduced monthly inference spending by up to 30%.
Experience
Work history, roles, and key accomplishments
FS
Current
Principal AI Engineer
Flui Solutions
Jan 2018 - Present (8 years 9 months)
Founded and ran an independent consultancy delivering backend and AI platform engagements, turning early-stage prototypes into production systems with 99.95% uptime for 5 external clients. Architected multi-tenant AWS platforms and production multi-agent LLM systems with LangGraph, cutting inference costs by up to 50%.
VI
Senior Backend Engineer
VILT
Oct 2022 - Mar 2026 (3 years 5 months)
Architected the core Python/FastAPI platform for the Atlas AI Agent, automating 30% of support tickets. Built automated LLM evaluation systems, RAG retrieval with PostgreSQL and pgvector, and integrated 10+ MCP servers.
EB
Senior Backend Systems Engineer
Engineering do Brasil
Jan 2017 - Oct 2018 (1 year 9 months)
Reduced query latency by 35% and cut downtime by 20% while owning MongoDB operations for multi-tenant telecom applications. Led migration of a legacy monolith to Kubernetes-based microservices and improved system reliability, reducing incident recurrence by 40%.
Built and consumed external REST APIs and legacy SOAP endpoints for third-party financial systems, cutting API response times by 40% via query tuning and caching. Directed cross-functional teams to deliver scalable solutions for key clients including Itaú, Bradesco, Porto Seguro, and TIM Brasil.
Education
Degrees, certifications, and relevant coursework
AE
Anhanguera Educacional
Tecnólogo em Tecnologia da Informação, Information Technology
2009 - 2011
Tecnólogo (Brazilian technologist degree) in Information Technology, 2009-2011.
EC
Estácio / Faculdade Integrada do Ceará
Tecnólogo (Technologist Degree), Network and Systems Administration (Computer Networks)
2005 - 2007
Tecnólogo (Brazilian technologist degree) in Network and Systems Administration (Computer Networks), 2005-2007.
Availability
Looking for a job
Location
BrazilAuthorized to work in
Salary expectations
72k+ USD
Social media
Job categories
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