Ahsan K

Data Scientist & Data Engineer — Analytics & Insights Engine

Linxed • Freelance

Feb 2026 - Present • 6 mos

Linxed turns extracurricular learning into a gamified XP and progress system. They had the product vision but no working analytics layer — the exact feature parents were meant to pay for. I owned that build end to end: designing the XP and progress-report calculation engine in Python, then a benchmarking pipeline that ranks each student against age-banded regional norms. I assembled a verifiable registry of 100+ government and research datasets across the UK, Hong Kong and US, and wrote the methodology, glossary and technical docs the rest of the team builds from. Worked directly with the founder and backend lead, and helped onboard the next developer.

Technical Instructor — Python, Data Science & AI Engineering

Fiverr • Freelance

Dec 2023 - Present • 2 yrs 8 mos

I teach the same stack I build in production: Python, data science, and AI engineering. Everything runs 1-on-1 as live coding over Zoom with the student at the keyboard rather than slides, and each session ends with clean commented code, a recording, and written material I author myself — annotated Jupyter notebooks, lecture references, and architecture diagrams. Each curriculum is built against the student's level and goal. Across engagements that has covered Python and OOP, REST APIs, error handling, logging and debugging with stack traces and pdb; prompt engineering and LLM integration; context-aware agents with token-based memory trimming, summarisation, and Redis/SQLite state persistence; asyncio and streaming; LangChain, LangGraph, and multi-agent orchestration; RAG engineering from chunking and parent-child retrieval through hybrid search, reranking, threshold calibration, and evaluation with RAGAS; Text-to-SQL guardrails and PII handling; agentic workflows in Claude Code; and deployment with Streamlit. Learners finish able to build and extend these systems unaided — a deployed app, a working agent, a capstone they wrote themselves. Google- and IBM-certified, with university certifications from Duke, Michigan, and UC Davis. 2,000+ learners follow the same material on YouTube.

Data Scientist & Full-Stack Engineer — Optimization, ML & Cloud

ZeroCabin • Freelance

Mar 2026 - Apr 2026 • 1 mo

ZeroCabin, a Chilean sustainable-housing startup, needed to stop guessing where to anchor a cabin suspended between four trees. I built the whole solution end to end: the optimization algorithms in a Python backend that compute and validate strut positioning across multiple methods, the frontend calculator users actually work with, and the infrastructure behind it — I advised on the hosting architecture, then provisioned and deployed the full web app on a VPS with nginx and SSL. The client confirmed full satisfaction and engaged me on a second product, Apptonomus, where I designed the technical architecture for an IoT rainwater-monitoring system (ESP32 sensors, FastAPI backend, ML consumption forecasting). Solo ownership throughout — algorithms, frontend, cloud, and deployment.