Örs-Krisztián Patakfalvi, Developer in Cristuru Secuiesc, Harghita County, Romania
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Örs-Krisztián Patakfalvi

Verified Expert  in Engineering

Full-stack Developer

Cristuru Secuiesc, Harghita County, Romania
Toptal Member Since
March 5, 2022

Krisztián has been working as a full-stack developer for over five years. He took part in various challenging projects in the telecommunications, safety, IoT, and mobile industries, handling engineering requirements, solutions architecture, DevOps, and back- and front-end development. Krisztián is an open-minded, well-organized person and a problem solver with great attention to detail who can successfully move big ideas from design to implementation.


JavaScript, React, Node.js, Redis, Docker, NGINX, REST APIs, Express.js...
JavaScript, Python, Git, HTML, CSS, Web Development




Preferred Environment

Windows, IntelliJ IDEA, Linux, Git, Visual Studio Code (VS Code)

The most amazing...

...solution I've worked on is a microservice capable of processing and analyzing a tremendous amount of data from telecommunication sites all over the country.

Work Experience

Full-Stack Developer and DevOps Engineer

2018 - PRESENT
  • Took part in planning and designing various projects based on the requirements. Designed and built microservice systems capable of handling tens of thousands of events per second. Owned features, epics, and subprojects.
  • Developed UI features like managing various domain-specific entities, handling authentication and notifications, and displaying blueprints of factories with objects moving in real time.
  • Created tools for performing large-scale load tests and validations on a distributed microservice solution. Based on those results, optimized the processing, ingestion, and reading performance of the IoT events by several folds.
  • Developed back-end features such as API endpoints, authentication, authorization, data manipulation and processing.
  • Dealt with continuous integration and delivery (CI/CD) solutions and built up and maintained the deployment of several projects in Kubernetes.
  • Mentored bachelor and master's students during internships by leading their projects.
Technologies: JavaScript, React, Node.js, Redis, Docker, NGINX, REST APIs, Express.js, Kubernetes, Rancher, Material UI, PostgreSQL, Apache Kafka, Kafka Streams, Python, GitLab, GitLab CI/CD, OpenVPN, TimescaleDB, MQTT, Grafana, Java, Spring, Swagger, Agile, Sprints, Kanban, API Development, Stream Processing, Microservices, Web Development, DevOps

Intern | R&D Engineer

2017 - 2017
  • Worked on a web-based tool for speeding up the configuration of the telecommunication servers.
  • Developed a custom in-browser spreadsheet library capable of handling millions of rows and thousands of columns by virtualization.
  • Built most of the user interface, keeping in mind the user experience and the site responsivity.
Technologies: JavaScript, Python, Git, HTML, CSS, Web Development

CSP | IPM Project

An integrated process data management solution that collects measurement and process data from production lines. I took part in architecting and rebuilding critical parts of the system in a scalable way, handling the rising load.


A remote monitoring and control system for telecom sites that enables optimized site maintenance and energy management. I helped design the system based on the requirements and developed new features on both the back and the front end. I built up and maintained the project deployment and dealt with automated CI/CD pipelines. I also owned epics and sub-projects like designing and building a scalable OpenVPN infrastructure or implementing an IoT devices simulator capable of generating a high load of real-like data.

EmSafe and EmTrace

A microservice system combining tracking, optimization, and safety for industrial operations using advanced positioning and location technology. I was developing both back-end and front-end features, taking part in the architecture design, building and maintaining automated CI/CD pipelines, and ensuring the system deployment.

Online Freelance Marketplace

A MongoDB, Express.js, React, and Node.js (MERN) application for finding professionals and handypersons on demand. The professionals can create a detailed profile while users and guests can search among the masters. Being a side project, I was dealing both with the front-end and back-end development and all other aspects of the development like design, architecture, and DevOps.


JavaScript, Python, HTML, CSS, Java


Express.js, Material UI, Spring, Swagger, Spring Boot, gRPC


API Development, React, Node.js, REST APIs


GitLab, GitLab CI/CD, Docker Compose, Git, NGINX, MQTT, SendGrid, Firebase Cloud Messaging (FCM), Kafka Streams, OpenVPN, Grafana, IntelliJ IDEA


Microservices, DevOps, Design Patterns, Mobile Development, Software Testing, Agile, Parallel Programming, Kanban


Docker, Kubernetes, Apache Kafka, Windows, Visual Studio Code (VS Code), Linux, Rancher, DigitalOcean, Azure


Web Development, Software Engineering, Data Modeling, Algorithms, Data Structures, TimescaleDB, Single-page Applications (SPA), Networking, Artificial Intelligence (AI), Data Analysis, Machine Learning, Data Mining, Robotics, Information Retrieval, Monte Carlo Simulations, Natural Language Processing (NLP), Performance Engineering, OAuth, Sprints, Stream Processing, Protocol Buffers, Cloud, Cloud Security, Cloud Storage, Cloud Services, GPT, Generative Pre-trained Transformers (GPT)


Databases, MongoDB, PostgreSQL, Redis

2018 - 2020

Master's Degree in Data Analysis and Modelling

Babeș-Bolyai University | UBB - Cluj-Napoca, Romania

2015 - 2018

Bachelor's Degree in Computer Science

Babeș-Bolyai University | UBB - Cluj-Napoca, Romania


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