About Thiago
I help CTOs, product leaders and engineering teams turn GenAI initiatives into secure, observable and production-ready systems — not prototypes that remain in a drawer.
As a hands-on AI Architect and Fractional CTO, I combine 21+ years in software engineering with senior technical leadership across AI, cloud, backend and platform architecture. I take initiatives from opportunity assessment and architecture through implementation, production hardening and team handover.
What I deliver
• Production RAG, LLM and AI-agent platforms with evaluation, guardrails and observability
• Cloud and backend architecture for scalable, event-driven systems
• Architecture reviews, modernization roadmaps and technical due diligence
• LLMOps/MLOps, reliability, security, FinOps and delivery acceleration
• Fractional CTO and technical leadership for startups, scale-ups and enterprise teams
Selected results
• Modernized 200+ applications and reduced infrastructure costs by 45%
• Architected systems processing 500K+ transactions/hour and services handling 2M+ daily requests
• Delivered RAG solutions across 100K+ documents
• Mentored 15+ engineers across architecture, CI/CD and delivery
Core stack: Python, Java, FastAPI, Spring Boot, AWS, GCP, Kubernetes, Kafka, PostgreSQL, vector search, LangGraph, CrewAI and MCP.
Available for architecture sprints, production AI pilots, modernization audits, delivery rescue and ongoing Fractional CTO support. Based in Lisbon, working remotely across Europe and on-site in Lisbon up to one day per week. Available immediately.
Verified coding credentials - HackerRank (hackerrank.com/profile/tfantas): Problem Solving 6-star, Java 5-star, Python 5-star badges and the Software Engineer Role Certificate (2026).
English
Fluent
Portuguese
Native or bilingual
Spanish
Basic
Can work on-site
Lisbon (up to 50km)
Experience
- CapgeminiSenior AI and Software Architect / Tech LeadTECHDecember 2018 - Today (7 years and 8 months)Lead hands-on architecture and delivery for regulated enterprise AI, cloud, backend and platform programs. Design production RAG, LLM orchestration and AI-agent solutions with evaluation, observability, guardrails and cost controls. Translate business needs into secure architectures and executable delivery roadmaps.Modernized 200+ legacy applications to AWS cloud-native services, reducing infrastructure costs by 45%. Architected event-driven systems processing 500K+ transactions per hour with Java/Spring Boot, Kafka, PostgreSQL and Kubernetes. Mentor 15+ engineers across architecture, CI/CD, reliability and delivery.
- Above-NetSolutions ArchitectJanuary 2018 - December 2018 (11 months)Rio de Janeiro, BrazilSolution architecture for enterprise Java platforms and AWS cloud deployments. Microservices design, API integration and continuous delivery practices. Skills: Amazon EC2, Java SE, Solution Architecture, Microservices
- DruidJava Architect / Solutions ArchitectFebruary 2017 - January 2018 (11 months)Rio de Janeiro, BrazilJenkins as build and deployment tool for automated delivery pipelines. AWS services: RDS Relational Database Service, EC2 Linux/Ubuntu instances, ELB Elastic Load Balancer. Netflix OSS microservices patterns: circuit breaker with Hystrix, Eureka for service discovery, Config Server and configuration repository, API Gateway. Docker and Docker Compose; Java REST web services on a microservices architecture. Skills: Amazon EC2, Java SE, Docker, Microservices, Jenkins
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Education
- Professional Certificate in AI and Machine LearningPurdue University2026Comprehensive program covering Applied Data Science with Python, Machine Learning, Deep Learning, Generative AI, Supervised & Unsupervised ML, GANs, TensorFlow, RAG, Databricks and Prompt Engineering. Purdue PCP AIML Jul 2025 Cohort 82 (Jul 2025 - Feb 2026).
- MBA in Software EngineeringUFRJ - Federal University of Rio de Janeiro2014Master of Business Administration (MBA), Software Engineering (2013 - 2014). Software architecture, distributed systems and IT service management.
Certifications
- Get Started with Databricks for Generative AISimplilearn (SkillUp) — Databricks2025
- Software Engineer - Role CertificateHackerRank2026