I will build a custom web application

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nikolay_svtl
N
nikolay_svtl
Nikolay S.
build a custom web application
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build a custom web application
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build a custom web applicationbuild a custom web application

About this gig

Do you need a software system that is built to last, not just "patched together"?

I am a software engineer and Machine Learning researcher with a focus on clean architecture and computational efficiency. I build systems that are optimized for performance and scalability.

I have successfully architected and deployed full-stack systems currently in use by 300+ active users, handling everything from database integrity to secure user authentication.

What I can build for you:

  • Custom Web Applications: Modern and fast.
  • Robust Backend APIs: High-throughput APIs using the Spring Framework.
  • Database Design: Optimized SQL architectures.
  • System Refactoring: Improving existing codebases for better speed and readability.

Why my approach is different:

Coming from a research background, I prioritize algorithmic efficiency. I ensure that your application doesn't just "work," but runs with the minimum possible latency and resource consumption.

My Tech Stack:

  • Backend: Java (Spring Boot, Spring Security)
  • Frontend: HTML5, CSS3, JavaScript
  • Databases: PostgreSQL, MySQL, SQLite, Firebase
  • DevOps: Git, Linux Server Management


  • Programming language

    • Java

  • Expertise

    • Debugging
    • Localization
    • Performance
    • Security
    • Design

  • Backend framework

    • FastAPI
    • Spring

Get to know Nikolay S.

Nikolay S.

Full Stack Developer and ML Engineer

  • FromSerbia
  • Member sinceJun 2026

  • Languages

    English, Russian, German, Serbian
My projects range from production web applications serving hundreds of active users to machine learning research accepted at the ICML 2026 EMM-QA Symposium. I have worked with Java, Spring Boot, PostgreSQL, Python, PyTorch, JavaScript, and cloud-hosted infrastructure to build solutions across NLP, computer vision, web development, and automation. Services I offer include: • Custom software development • Backend systems and API design • AI and machine learning integration / consulting • NLP, RAG and data processing solutions • Dataset creation and preparation

My Portfolio

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