Looking for a job

Yohannes Alexander Agusti Sinaga

@yohannesalexanderagu

Message

I build backend systems and AI-powered applications for real-world business solutions.

Indonesia

Message

What I'm looking for

I'm looking to build reliable backend and AI products where I can apply LLM, RAG, cloud, and software architecture skills to real business problems while continuing to learn emerging technologies.

I'm building backend services and AI-powered applications, from secure OCR integrations at PT. Maybank Indonesia Finance to multi-tenant AI assistant platforms.

At Maybank Indonesia Finance, I develop and maintain RESTful APIs with .NET Core, ASP.NET, VB.NET, SQL Server, Python, and FastAPI. I support OCR services for ID cards and family cards while applying hashing and token-based authentication for secure data exchange.

Previously at Pharos Group, I developed end-to-end AI systems for blister defect detection, face recognition, liveness detection, and OCR using YOLOv8, DeepFace, MiniFASNET, and PPOCRv4. I also integrated Arduino-based sensors and actuators with AI systems and built interfaces with PyQt5.

I'm currently developing a multi-tenant AI agent SaaS using Next.js, FastAPI, PostgreSQL, LangGraph, LangChain, ChromaDB, Redis, Docker, and GitHub Actions. I enjoy turning LLM, RAG, cloud, and backend technologies into reliable products that solve business problems.

Experience

Work history, roles, and key accomplishments

Current

Founder & AI Platform Engineer

Current

Multi-Tenant AI Agent Platform (SaaS)

Jan 2026 - Present (8 months)

Developed a multi-tenant SaaS platform for custom AI assistants, architected a stateful agentic RAG pipeline, and built real-time integrations for WhatsApp and Telegram.

Next.js fastAPI LangGraph ChromaDB Redis PostgreSQL WebSockets Midtrans Docker CI CD GitHub Actions

Current

Backend Developer

Current

PT. Maybank Indonesia Finance

Dec 2024 - Present (1 year 9 months)

Designed, developed, and maintained RESTful APIs and backend services using .NET Core, ASP.NET, VB.NET, and SQL Server. Implemented API-based OCR services integrated with AI systems and applied data security mechanisms.

.NET Core ASP.NET VB.NET SQL Server Python fastAPI OCR REST APIs Git GitHub SVN Jira Agile Development

Back End Java Engineer

Synergy Academy By Binar Academy and BCA

Feb 2024 - Aug 2024 (6 months)

Collaborated on developing the FinSera App for people with disabilities, building APIs with Spring Boot and PostgreSQL.

Java Spring Boot PostgreSQL

Cloud Computing Cohort

Bangkit Academy led by Google, Tokopedia, Gojek, & Traveloka

Feb 2024 - Jul 2024 (5 months)

Collaborated on a startup project, managed cloud architecture with Google Cloud Platform, and developed APIs using Node.js and Express, deploying machine learning models.

Google Cloud Platform Node MySQL TensorFlow Flask API Development

Back-End AI Developer

PT. Inti Utama Solusindo (Pharos Group)

Aug 2023 - Dec 2023 (4 months)

Researched and implemented AI and IoT technologies for the pharmaceutical industry, including AI Blister Defect and Face Recognition systems. Managed end-to-end AI model development and integrated systems with sensors and actuators.

YOLOv8 DeepFace PP OCRv4 Arduino Python Computer Vision IoT

Python Engineer Intern

PT. Obor Pengetahuan Indonesia untuk Masyarakat

Feb 2023 - Jun 2023 (4 months)

Collaborated on a project for face detection and recognition of exam participants to prevent cheating. Managed multiple AI models and evaluated their performance.

Python TensorFlow Keras DeepFace OpenCV NumPy Machine Learning Deep Learning Computer Vision

Education

Degrees, certifications, and relevant coursework

Airlangga University

Bachelor of Computer Science, Information Systems

2020 - 2024

Grade: 3.76 (Cum Laude)

Pursued a Bachelor of Computer Science with a major in Information Systems, graduating with a GPA of 3.76 (Cum Laude). Final thesis focused on house price prediction in DKI Jakarta using machine learning and a Flask-based website.