A Portfolio of

Dennis Jonathan

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About.

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Hey, I'm Dennis — I like solving problems, learning stuff, and building things that (hopefully) make life a little easier. I've got a background in math and stats, but these days I'm more into what you can do with that knowledge — especially when it comes to AI, automation, and making things a bit smarter than they were yesterday.

I've built and shipped ML apps, worked across different stacks, and helped teams get real value out of messy data. But honestly, what excites me most isn't just the tech — it's the moment when something clicks for someone, or when a rough idea turns into something real. I'm into making AI less intimidating, more useful, and ideally a little more fun. Whether it's prototyping tools, building out workflows, or just tinkering until something works — that's my happy place.

Outside of work, you'll usually find me reading ML papers I don't fully understand (yet), scribbling down half-finished ideas, tearing through comics, or doing laps in sim racing like it actually matters. I'm a big fan of side projects — the stranger the better — and I really enjoy working on stuff that doesn't have a clear roadmap. I think good ideas come from unexpected places, and I try to stay open to all of it.

If you're into data, design, or just making cool things — feel free to reach out. I'm always down to talk shop, swap ideas, or build something awesome together.

Work Experience.

Some of the gigs that taught me how to ship fast without cutting the good corners and how to keep teams looped in so momentum stays loud from kickoff to ship day.

  1. Analytics, AI, & ML Staff

    Sinarmas Land

    Sinarmas Land
    • Spearheaded optimization of OCR pipelines and developed self-service AI platform, achieving high-accuracy document processing for 2,000+ daily requests.
    • Architected and deployed an AI-powered document summarization system for sales letters using Generative AI and OCR, significantly reducing review time.
    • Developed and seamlessly integrated automated OCR services for invoices and tax documents, achieving high-accuracy document processing at a significant scale.
    • Experimented with and implemented cutting-edge AI models for document processing, including OCR, LLMs, and RAG, to enhance the company's data extraction and analysis capabilities.
    • Engineered a robust enterprise agentic chatbot utilizing LangChain and OpenAI, effectively streamlining internal communications across diverse departments. It uses RAG and ReAct to provide accurate and up-to-date information to employees.

  2. ML/AI Developer and Tester Intern

    Sinarmas Land

    Sinarmas Land
    • Actively contributed to the maintenance and advancement of the company's proprietary machine learning pipelines, with a primary focus on OCR systems for document information detection and extraction.
    • Collaborated in the creation of novel OCR pipelines specifically designed for Vehicle Registration Number (VRN) detection and extraction.

  3. Business Intelligence Analyst Intern

    Vidio.com

    Vidio.com
    • Played a key role in generating actionable insights and fostering a deeper understanding of platform user behaviors and product analytics through SQL and advanced visualization tools.
    • Conducted in-depth research on user funneling progression, customer retention strategies, and cancellation patterns.

  4. Marketing Research Intern

    Universitas Prasetiya Mulya

    Universitas Prasetiya Mulya
    • Assisted in identifying and evaluating potential strategic partners for the successful launch of Universitas Prasetiya Mulya's Master's program in Business Analytics.
    • Performed comprehensive competitor research to pinpoint opportunities for enhancing and optimizing marketing initiatives.

  5. Bachelor of Mathematics

    Universitas Prasetiya Mulya

    Universitas Prasetiya Mulya
    • Graduated with a distinguished GPA of 3.88.
    • Authored a thesis on "Predictive Modelling of Changes in GOTO Stock Prices using Historical and Exogenous Data with LSTM and SARIMAX".
    • Honored as a beneficiary of the prestigious Young Scholar Indonesia Scholarship.

Featured Projects.

A highlight reel of builds I loved obsessing over. Mostly scrappy experiments that makes me cherish the good old days.

Document Rotation Classification

Document Rotation Classification

Sometimes a slight nudge is all it takes to get documents straight

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Act Natural

Act Natural

Teaching AI to act human? Spoiler alert: it's beautifully chaotic.

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Bird Classifier on EfficientNet-B2

Bird Classifier on EfficientNet-B2

Ever wondered what bird you're looking at? This classifier has over 90k downloads on HuggingFace's model hub.

View Project
View All Projects and More.

Skills and Stacks.

Some of the tools and technologies I've used to build stuff. This represents things I've dabbled in and might be updated in the future as I explore new technologies.

Reach Me Here.

Let's talk shop, job offers, or whatever you're building next, and swap stories interesting stories about tech and life in general.