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Darwing Parra

@darwingparra

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Senior Full-Stack Engineer modernizing systems into cloud-native, AI-enabled solutions.

United States

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What I'm looking for

I seek senior engineering roles building cloud-native, AI-enabled systems with strong emphasis on scalability, observability, and team collaboration.

I am a Senior Full-Stack Engineer with over 15 years of experience modernizing legacy systems into high-performance, cloud-native solutions. I specialize in backend development across .NET, Java, Golang, PHP, and Node.js, and build modern frontends with React, Angular, Vue.js, Svelte, and TypeScript.

I've architected scalable microservices on Azure and AWS, implemented CI/CD with Terraform and Azure DevOps, and delivered production AI integrations including RAG systems with LangChain and Azure OpenAI. My work on computer vision (TensorFlow/CNN) and knowledge graphs (Neo4j) produced measurable gains in accuracy and search relevance.

I design and implement secure, high-availability systems—RESTful APIs, gRPC services, payment integrations, and HIPAA-compliant healthcare platforms—optimizing performance and reliability for millions of records and high daily user counts. I also lead cross-platform mobile development using React Native, Flutter, and native Android.

I hold Azure Developer Associate (AZ-204) certification and advanced coursework in AI and cloud development, and I bring a pragmatic, results-driven approach to building resilient, observable systems that reduce costs, improve performance, and accelerate time-to-value.

Experience

Work history, roles, and key accomplishments

Senior Full-Stack Engineer

HTA

Oct 2023 - Jan 2026 (2 years 3 months)

Designed and deployed RAG systems with LangChain and Azure OpenAI reducing AI hallucinations by 70% and built CNN-based computer vision achieving 94% accuracy on 50K+ images; architected .NET 8 microservices, CI/CD with Terraform/Azure DevOps, and cross-platform mobile apps with 95% code reuse.

Azure Lang Chain .NET 8+TensorFlow Neo4j Golang React Native gRPC Terraform

Senior Software Engineer

WellCare

Oct 2018 - Oct 2023 (5 years)

Developed predictive analytics and TensorFlow NLP systems for claims fraud detection and ICD-10 coding, improving detection accuracy to 87% and reducing manual coding time by 60%; migrated WCF to .NET Core and built HIPAA-compliant ETL processing 1M+ records monthly.

scikit learn TensorFlow .NET Core SQL Server Golang Angular Flutter HIPAA

Full Stack Engineer

SystemSoft

Mar 2016 - Jun 2018 (2 years 3 months)

Designed .NET Core microservices with Azure Service Bus to improve scalability by 60% and developed cross-platform mobile apps (React Native, Flutter) with real-time features and offline support.

.NET Core Azure Service Bus React Native Flutter Redux Angular Java SQL

Full Stack Web Developer

Value Technologies

Feb 2011 - Feb 2015 (4 years)

Led integration platform development using .NET processing 40+ data formats for Unilever South Africa and built mobile and web apps for NGOs and donors, enabling offline data capture and supporting 5K+ active donors.

.NET React Native PHP Angular Vue.Js SQLite