Matej Krejci - DevOps Engineer, Freelancer

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Work Background

Enrian PartnersDevOps Engineer

Feb. 2023Prague, Czechia

Global Payments Inc.Infrastructure Platform Engineer

Sep. 2020 - Jan. 2023Prague, CzechiaDeveloped on-premise infrastructure platform to meet technological requirements while ensuring compliance with PCI DSS standards for the credit card industry. Worked on migration of business applications from outdated mainframe systems to the new platform. Implemented GitOps for streamlined infrastructure management, automating tasks and maintaining code-defined infrastructure components. Orchestrated centralized monitoring of servers and applications, alongside efficient logging collection and incremental backup of runtime data.

KENDAXA GroupSoftware Developer

Sep. 2019 - Sep. 2020Prague, The Capital, Czech RepublicKey Contribution: Part of the core team instrumental in designing and developing the backend for a highly adaptable and scalable data platform leveraging Kafka streams technology. Responsibilities: • Contributed to the overarching architecture design, ensuring alignment with project objectives. • Led the design and development efforts for resilient streaming services, utilizing Python as the primary language. Tech Stack Expertise: • Proficient in Python, with expertise in frameworks such as Faust, Confluent Kafka, and Pandas. • Experienced with Kafka and RocksDB, proficient in containerization with Docker, and skilled in continuous integration with Bamboo. • Familiarity with Avro for efficient data serialization.

Esri R&D center - Vienna (acquired indoo.rs)Software Engineer

Feb. 2019 - Aug. 2019Vienna, Vienna, Austriaindoo.rs is the leading provider in real-time Indoor Positioning, Asset Tracking, Navigation and Mapping solutions for your Corporate Campus, Airport or Transportation hub, Healthcare Center, Industrial Facility, University, Hotel or Retail location. Using our cutting-edge patented technology, indoo.rs adds location intelligence and user-friendly functionality to indoor environments to optimize business efficiency, reduce time wastes and add value across your business. Providing a total solution with fast and accurate setups in any location, indoo.rs has successfully delivered projects in many different industries and use cases to customers around the globe. In February 2019, the company was acquired by Esri, the leading international supplier of GIS software.

indoo.rsSoftware Developer (backend, DevOps)

Jun. 2016 - Aug. 2019WienExperience Highlights: • Development of Python backend for an innovative indoor localization system, ensuring seamless performance and accuracy. • Optimized Python software through the implementation of geospatial algorithms, leveraging libraries such as Numpy and Pandas to enhance efficiency. • Successfully ported software to mobile platforms using C++, incorporating Eigen and Swig for seamless integration.. • Automated software testing processes, enhancing overall product reliability and reducing manual effort. • Automated server deployment using Docker, Docker Swarm, and docker-compose, streamlining infrastructure management. Tech Stack Proficiency: • Expertise in Python, with proficiency in Pandas, Numpy, and Shapely for data manipulation and geospatial analysis. • Proficient in C++ programming, utilizing Eigen and Swig for software portability. • Experienced in containerization with Docker and orchestration with Docker Swarm and docker-compose, with expertise in cloud initialization using cloud-init. • Familiarity with Protocol Buffers for efficient data serialization and MQTT for lightweight messaging protocols, with hands-on experience in Raspberry Pi development. • Proficient in automation tools such as Ansible and continuous integration with TeamCity. • Experience with geospatial data visualization using Geoserver, alongside proficiency in version control with Git and project management tools like Jira and Confluence.