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Available for freelance & B2B contracts

Hasan YILMAZ

Senior Full-stack Developer

I build modern web applications, LLM & AI tool integrations and data products — from backend services and cloud infrastructure to polished frontends.

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Portrait of Hasan YILMAZ
Istanbul, Türkiye
  • METUB.Sc. Computer Engineering, 2015
  • ~9 yrsProfessional experience
  • B2BFreelancer & contractor
  • Onsite · RemoteFlexible engagement

01 About

From .NET to Node, Python and the cloud

Graduated in 2015 from Middle East Technical University (ODTÜ). My career started with Microsoft technologies such as C#/.NET and continued with open-source and Unix technologies — Node.js on the backend and Python for data science.

Backend

  • Node.js
  • C# / .NET
  • Python

Frontend

  • React
  • Angular

Databases

  • PostgreSQL
  • MySQL
  • MSSQL
  • MongoDB
  • Firebase

Cloud

  • AWS S3
  • EKS / ECS
  • Lambda
  • Redshift
  • GCP BigQuery

DevOps

  • Docker
  • Kubernetes
  • Git workflows

Architecture

  • Microservices
  • Kafka
  • RabbitMQ

02 Resume

Documents & skills

Resume

One-page summary

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Resume (detailed)

Full experience & projects

View

Cover letter

A short introduction

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Professional skills

  • Engineering80%
  • Photography67%
  • Life43%

(-_-)

03 Certificates

Badges & certifications

Click a badge for its details.

04 Works

Packages, apps & experiments

PyPI package

Prompt LLM

Python package to prompt LLMs from the command line.

View on PyPI
Web · Guide

Tool Augmented AI

Best-practices guide for training LLMs on tool-augmented (function calling) capability.

toolaugmented.ai
Web app

Tool Calling AI

Make function calls with LLMs from OpenAI, MistralAI and TogetherAI.

toolcalling.ai
NPM package

Custom Permutation

Generate permutations with custom options — for JavaScript / Node.js.

View on npm
PyPI package

Custom Permutation

Generate permutations with custom options — for Python.

View on PyPI
PyPI package

Custom Combination

Generate combinations with custom options — for Python.

View on PyPI
React · Game

Tic Tac Toe

Classic tic tac toe against a basic Min/Max AI opponent.

Play
React · Game

Predict a Number

Guess the randomly picked number using + / - hints.

How to play

+ a digit guessed and placed correctly. - a digit that exists but is in the wrong place.

E.g. the game picks 1234 and you guess 4200 → it shows -+: - for 4 (exists, wrong place), + for 2 (correct).

Play

05 Projects & Services

Things I build — and can build for you

Projects

Services

  • Full-stack web development

    Modern technologies for advanced web apps.

  • LLM & AI tool integration

    Internal or external AI tool integration services.

  • Data science

    Data visualization, data engineering or basic ML modeling.

All services are signed as a B2B contract.

06 Blog

Latest writing

All posts

· aircall, slack, ai-agents, cost-optimization, mcp, custom-gpt, text-to-sql, airflow, dbt, redshift, aws-lambda, python, nodejs

What I Built at Aircall: AI Slack Agents, Self-Service Data and Data Pipelines

A look back at the main projects I worked on in the Aircall data team: AI-powered Slack apps (one of which saved $80K/year on tooling), a text-to-SQL self-service agent called...

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· cybersecurity, malware, interview, vscode, devguard

Three fake interviews, three malware repos

Every "take-home task" I scanned this year tried to run malware the moment the folder was opened. What they had in common, how to protect yourself, and how to scan...

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· web, cybersecurity, vscode, malware, interview

Is VS Code safe for a repo you never run?

Most of us follow one simple rule with code we don't trust - read it, don't run it. A fake interview repo shows why opening the folder is already running...

Read post

07 Contact

Let's build something

Have a project, a contract or just a question? Reach out on any channel — I usually reply within a day.