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

With 6+ years of full-stack development experience, Krisztián has tackled challenging projects spanning telecommunications, safety, IoT, and the HR space with a focus on automation. From requirements engineering to solution architecture, Krisztián has been involved in all aspects of project lifecycles, including DevOps and back- and front-end development. A problem solver at heart, Krisztián is fueled by a passion for technology and excels in navigating complex technical landscapes.


React, Node.js, SQL, JavaScript, PostgreSQL, Redis...
React, Node.js, SQL, JavaScript, PostgreSQL, Redis...
JavaScript, React, Node.js, Redis, Docker, NGINX, REST APIs, Express.js...




Preferred Environment

Windows, Linux, Git, Visual Studio Code (VS Code), MacOS

The most amazing...

...project I've contributed to is a microservice designed to process and analyze vast volumes of data collected from telecommunication sites across the country.

Work Experience

Senior Engineer

2023 - PRESENT
  • Contributed to successfully integrating Sora's existing product into ADP's ecosystem and product offering post-acquisition, enhancing ADP's service portfolio and expanding market reach.
  • Collaborated in implementing the connection between Sora's and ADP's notification centers for centralized messaging, improving communication efficiency within the integrated system.
  • Worked as a full-stack developer, contributing to UI and back-end feature development, enhancements, and bug fixes to ensure seamless integration and optimal user experience.
  • Specialized in integrating and working with 3rd-party services.
Technologies: React, Node.js, SQL, JavaScript, PostgreSQL, Redis, Visual Studio Code (VS Code), Slack API, API Development, Scaling, Web Development, Integration, HR Integration, API Integration, Automation, Automation Engineering

Senior Engineer

2022 - 2023
  • Contributed to developing Sora, an HR automation software aimed at streamlining repetitive HR processes and enhancing operational efficiency through innovative workflow automation solutions.
  • Specialized in bridging the gap between Sora and 3rd-party services, focusing on integration engineering.
  • Took ownership of significant new integration projects, including Checkr, ADP Run, Dropbox Sign, Ashby, MS Teams, Twilio, and Webex, contributing to successful integration and product enhancement.
  • Participated in medium-sized refactoring initiatives and system improvements, ensuring high operational efficiency and performance at Sora.
Technologies: React, Node.js, SQL, JavaScript, PostgreSQL, Redis, Visual Studio Code (VS Code), Twilio API, Slack API, DocuSign, Adobe Sign, ADP APIs, Checkr, Dropbox, Greenhouse, Gusto, Lever API, Microsoft Teams, Okta, Webex API, Workday API, Integration, HR Integration, API Integration, Automation, Automation Engineering

Full-stack Developer | DevOps Engineer

2018 - 2022
  • Contributed to automation initiatives, such as tracking and optimizing energy management at telecom sites and automating safety checks and audits on production lines.
  • Designed and built microservice systems capable of handling tens of thousands of events per second, ensuring high scalability and performance. Owned features, epics, and subprojects from conception to deployment.
  • Developed dynamic UI features, including domain-specific entity management, real-time factory blueprint displays with moving objects, and comprehensive authentication and notification systems.
  • Built crucial back-end features such as API endpoints, authentication, authorization, and data manipulation processes, ensuring seamless integration and data flow.
  • Created robust tools for large-scale load testing and validation of distributed microservice solutions. Enhanced IoT event processing, ingestion, and reading performance by several folds based on test results.
  • Spearheaded the development of automated CI/CD pipelines, facilitating continuous integration and delivery. Managed and maintained automated deployment of multiple projects in Kubernetes, significantly improving deployment efficiency and reliability.
  • Mentored bachelor and master's students during their internships, guiding them through project development and ensuring their professional growth and project success.
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, Automation, Automation Engineering, Single-page Applications (SPA), Protocol Buffers

Intern | R&D Engineer

2017 - 2017
  • Developed a web-based tool to expedite the configuration of telecommunication servers, enhancing operational efficiency.
  • Created a custom in-browser spreadsheet library using virtualization to handle millions of rows and thousands of columns efficiently.
  • Designed and implemented most of the user interface, prioritizing user experience and site responsiveness.
Technologies: JavaScript, Python, Git, HTML, CSS, Web Development

CSP | IPM Project

Developed an integrated process data management solution to collect measurement and process data from production lines. Contributed to architecting and rebuilding critical parts of the system in a scalable manner to handle the rising load. The solution focused on automating safety checks and audits, enhancing the reliability and efficiency of production line operations.


Developed a remote monitoring and control system to optimize telecom site maintenance and energy management. Assisted in system design based on requirements and contributed to back- and front-end feature development. Built and maintained the project deployment and automated CI/CD pipelines. Owned epics and sub-projects, including designing a scalable OpenVPN infrastructure and implementing an IoT device simulator for high-load, real-like data generation. The project focused on automation, particularly in tracking and optimizing energy management, enhancing operational efficiency and sustainability.

EmSafe and EmTrace

Developed a microservice system integrating tracking, optimization, and safety for industrial operations using advanced positioning and location technology. Contributed to back-end and front-end feature development, participated in architectural design, and built and maintained automated CI/CD pipelines to ensure efficient system deployment.

Online Freelance Marketplace

Conceptualized and developed a web application to connect users with verified and skilled local professionals, similar to receiving trusted personal recommendations. Professionals can register and create detailed profiles showcasing their expertise, services, portfolios, and client reviews, while users can easily search and filter through these profiles based on their specific needs. Managed front- and back-end development, design, architecture, and DevOps. The platform, operational in its first version, has garnered a growing user base in Romania and was successfully sold for market expansion.
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


AWS Certified Cloud Practitioner

Amazon Web Services


Azure Fundamentals



API Development, React, Node.js, REST APIs, Twilio API, Slack API, ADP APIs, Webex API, Workday API


GitLab, GitLab CI/CD, Docker Compose, Git, NGINX, SendGrid, Firebase Cloud Messaging (FCM), Kafka Streams, OpenVPN, MQTT, Grafana, IntelliJ IDEA, Adobe Sign, Checkr, Greenhouse, Microsoft Teams


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


JavaScript, Python, HTML, CSS, Java, SQL


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


Docker, Windows, Visual Studio Code (VS Code), Linux, Apache Kafka, DigitalOcean, Kubernetes, Rancher, Azure, Amazon Web Services (AWS), Dropbox, Gusto, MacOS


Databases, MongoDB, Redis, PostgreSQL


Software Engineering, Web Development, Data Modeling, Algorithms, Data Structures, OAuth, 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, TimescaleDB, Sprints, Stream Processing, Protocol Buffers, Cloud, Cloud Security, Cloud Storage, Cloud Services, Generative Pre-trained Transformers (GPT), Cloud Computing, Cloud Platforms, DocuSign, Lever API, Okta, Integration, HR Integration, API Integration, Scaling

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