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Arthur F
From Brazil 11:22 AM (GMT-03:00)
$40/hr or $85,000/yr
Active 1 hour ago
Member since Sep 2026

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Senior Software Engineer | Applied AI & Agentic Systems

AI-native engineer
Available for hire
Years of experience
18+ years
Experience level
Senior
Available from
29 Sep 2026
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I am a Senior Software Engineer with 15+ years of experience designing and delivering distributed backend systems for payments, credit, and financial services. I build production-grade applied AI and agentic systems using Python, FastAPI, LLMs, and RAG, combining hands-on engineering with technical leadership in retrieval evaluation, API integration, observability, and reliability.

My background spans Java and Golang microservices, Kafka-based event-driven architecture, and scalable services on AWS and GCP. I have delivered payment integrations at Repay, credit and payment platforms at Blackstone, and large-scale government systems at Dataprev. In freelance AI work, I reduced response times by 20%, maintained 99.9% availability, and increased delivery speed by 35% through reusable components.

I hold a master’s degree in Computer Science from UFCG and am pursuing an Applied Artificial Intelligence engineering program at UNIPDS. I speak fluent English (C1) and Portuguese, and I am interested in remote senior engineering opportunities in applied AI, agentic systems, and distributed backend development.

Additional technical experience includes Django REST Framework, GitHub Actions, AWS EC2/S3/RDS/ECS/CodeBuild/CodeDeploy, Apache Ignite, Datadog, Splunk, Pytest, Cucumber, unit and integration testing, incident response, and AI-assisted development with Claude and Cursor. My language experience includes Java (15+ years), Python (7+ years), Go (5+ years), and JavaScript (4+ years). My master’s research focused on distributed systems and scalable software architecture; during my bachelor’s degree, I published a paper on network optimization protocols.

Skills

JavaScript React.js SQL Kafka Docker AWS Angular.js GCP REST Lambda Kubernetes Terraform Microservices OpenAI Selenium Jenkins MongoDB PostgreSQL SQS SNS CI/CD Internet of Things Generative AI Large Language Models Python Java Go MS SQL Server .NET Spring Boot Django FastAPI Cloudwatch C# LangChain

Languages

English Portuguese

Employment History

AI Engineer | GenAI · LLM · RAG · Python at Freelance 2025 - 2026
Jun 2025 – Sep 2026. Provided technical leadership for clients across Brazil, building production-grade GenAI, LLM, and RAG applications integrated with scalable backend systems. Designed RAG pipelines with embeddings, semantic search, contextual retrieval, reranking, similarity thresholds, and release-gating evaluations; reduced response times by 20%. Architected AI agents integrating APIs, databases, and documents, with retry, idempotency, and human-in-the-loop escalation policies. Led Python/FastAPI service design, tracing, observability, and cost-latency monitoring. Integrated OpenAI and Claude with fallback strategies, maintaining 99.9% availability. Applied Clean Architecture, SOLID, and reusable components to increase delivery speed by 35%.
Senior Backend Engineer at Repay 2023 - 2026
Mar 2023 – Jun 2026. Designed Java 21 and Golang microservices for payments and financial services on AWS, using synchronous and event-driven communication. Integrated WEX credit card and virtual card services for authorization, settlement, and billing. Operated Docker/Kubernetes services and automated build, test, and release pipelines with Jenkins, GitHub Actions, and Terraform. Optimized SQL data pipelines for high-volume financial transactions. Collaborated with distributed engineering, finance, and business teams. Owned production health using Splunk and Datadog. Used Claude and Cursor for design, implementation, and code review.
Senior Backend Engineer at Blackstone 2021 - 2023
Mar 2021 – Feb 2023. Drove architecture and design for Java/Python microservices supporting credit and payment platforms. Built Kafka event-driven systems, optimized PostgreSQL models and transactional performance, and delivered data-ingestion pipelines with unit/integration tests. Extended React internal platforms integrated with Spring Boot, collaborating with frontend, product, finance, and business operations.
Backend Developer at Dataprev 2012 - 2021
May 2012 – Feb 2021. Built large-scale Java/Spring Boot distributed systems and supporting Python tooling for Brazilian government services, processing millions of records. Delivered REST APIs, microservices, and ETL pipelines using Spring Batch and PostgreSQL. Established code review and engineering standards. Modernized legacy services into cloud-native systems with improved scalability, deployment automation, and observability. Built fraud-prevention services detecting inconsistencies across government databases and automating validation.
Researcher and Software Engineer at Embedded Lab 2010 - 2012
Mar 2010 – May 2012. Developed APIs for IoT applications, including a pioneering network protocol for seamless wireless handoffs. Built an Android smart-environment monitoring application, improving data collection efficiency by 30%.
Fullstack Engineer at SKY Brasil / DirecTV 2008 - 2010
Jun 2008 – Mar 2010. Collaborated across teams to design and deploy scalable Java and .NET/C# web applications. Developed unit tests and contributed to automated test suites to improve code quality and reliability.

Education

Software Engineering, Applied Artificial Intelligence (in progress; expected Dec 2026) at UNIPDS Current 2026 - Now
Master’s Degree in Computer Science at UFCG — Federal University of Campina Grande 2010 - 2012
Bachelor’s Degree in Computer Science at UFCG — Federal University of Campina Grande 2003 - 2008
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