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Felix Marwuko

@felixmarwuko

Message

AI/ML and data engineer building production RAG pipelines and full-stack SaaS platforms with multi-tenant reliability.

South Korea

Message

What I'm looking for

I’m looking to build reliable, production-grade AI systems—especially RAG and agentic workflows—paired with full-stack data products, where I can own architecture end-to-end and ship with strong testing and compliance.

I’m an AI and data engineer with 4+ years building production-grade AI products, RAG pipelines, and full-stack SaaS platforms. I’m currently shipping FlexAI POS, a multi-tenant FastAPI + Next.js platform supported by 150+ passing integration tests, and I own architecture from backend isolation to frontend workflows.

I focus on dependable, regulated-ready systems: I engineered tenant-isolated data access to work around managed Postgres RLS limitations, implemented payment and ledger workflows, and added healthcheck and schema-drift protections. I also build analytics foundations—ETL pipelines and KPI reporting—and create compliance-oriented AI solutions with grounding and citation layers to reduce hallucinations.

Experience

Work history, roles, and key accomplishments

Current

Independent AI / Full-Stack Engineer

Current

Self Employed

Aug 2025 - Present (11 months)

Designed, built, and deployed production AI products and full-stack SaaS platforms end-to-end. Worked across RAG pipelines, LLM API integration, and FastAPI/Next.js application development with Postgres/pgvector.

fastAPI Next.js Postgres Pgvector LLM Integrations Render Vercel

Current

Lead Engineer & Architect

Current

FlexAI POS

Jan 2025 - Present (1 year 6 months)

Architected and built a tenant-isolated FastAPI + async SQLAlchemy backend with Neon Postgres, along with a Next.js frontend for a multi-tenant point-of-sale platform. Implemented tenant filtering to ensure data isolation, plus payment, ledger, and migration/healthcheck tooling.

fastAPI SQLAlchemy PostgreSQL NEON Tenant Filtering Next.js React Alembic Migrations REST APIs Idempotent Migrations Schema Drift Auditing Integration Testing

Data Analyst

Konyang University Hospital

Mar 2024 - Jul 2025 (1 year 4 months)

Built KPI dashboards and ETL workflows over clinical and operational data sources. Used SQL, Python, and Power BI for data validation, reporting, and exploratory analysis.

SQL Python ETL KPI Reporting Data Validation Power BI Reporting

Software Developer / Data Solutions

Independent Contractor

Feb 2022 - Feb 2024 (2 years)

Built backend APIs, data pipelines, and cloud-deployed AI solutions for early-stage startup clients. Delivered end-to-end work across full-stack and data engineering engagements.

Backend Data Pipelines Full Stack Data Engineering