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nuwanga wijamuni

@nuwangawijamuni

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AI Engineer at HSB Marine Constructions building RAG applications and agentic workflows with human approval.

Sri Lanka

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At HSB Marine Constructions, I developed an internal RAG application with retrieval APIs and a Streamlit interface, and built an eight-stage task-triage workflow with task ownership, prioritization, and CEO approval.

At One Billion Tech, I built and deployed a RAG application using LLaMA 3.3 and Weaviate, and developed a natural language-to-SQL application connecting LLaMA 3.3 to Snowflake. I also optimized Snowflake queries to run in under four seconds.

My projects include a LangGraph flight-search and booking agent, a voice-controlled restaurant assistant, and a satellite imagery pipeline using NVIDIA NIM. I hold an AWS Certified Data Engineer – Associate certification.

Experience

Work history, roles, and key accomplishments

Current

AI Engineer

Current

HSB Marine Constructions

Oct 2025 - Present (1 year)

Developed an internal RAG application with retrieval APIs, a Streamlit interface, and Docker Compose for local deployment. Built and tested an eight-stage executive task-triage workflow integrating ChatGPT, Google Drive, and Asana, with task ownership, prioritization, and CEO approval.

RAG Streamlit Docker Compose ChatGpt Google Drive Asana Vertex AI Cloud Run Gemini Speech to Text Documentation

Data Engineer Intern

One Billion Tech

Aug 2024 - Jul 2025 (11 months)

Built and deployed a RAG application using LLaMA 3.3 and Weaviate, with GitHub, Docker, Amazon ECR, and Amazon SageMaker for containerized deployment. Optimized Snowflake queries with materialized views and datetime clustering keys, reducing execution times to under four seconds.

RAG Llama 3.3 Weaviate GitHub Docker Amazon ECR AWS Sagemaker Snowflake fastAPI GROQ SQLAlchemy Stored Procedures

Data Scientist Intern

MAS Holdings

Mar 2023 - Mar 2024 (1 year)

Built and evaluated ARIMA, Prophet, and LSTM models for Walmart sales forecasting at MAS ACME. Automated sales-data pipelines for training and validation and developed Power BI dashboards for MAS Kreeda and Bodyline.

ARIMA Prophet LSTM Sales Forecasting Data Pipelines Power BI